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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Xiangming Xiao; Lifen Jiang; Junyi Liang; Anders Ahlström; +20 Authors

    La croissance accrue de la végétation par le réchauffement climatique joue un rôle central dans l'amplification du cycle saisonnier du CO2 atmosphérique sur les terres nordiques (>50° N) depuis les années 1960. Cependant, la corrélation entre la croissance de la végétation, la température et l'amplitude saisonnière de la concentration de CO2 atmosphérique est devenue insaisissable avec le ralentissement de la tendance à la hausse de la croissance de la végétation et l'affaiblissement du contrôle de la température sur l'absorption de CO2 depuis la fin des années 1990. Ici, sur la base des enregistrements de concentration de CO2 atmosphérique in situ du site de l'observatoire Barrow, nous avons constaté un ralentissement de la tendance à la hausse de l'amplitude du CO2 atmosphérique des années 1990 au milieu des années 2000. Ce phénomène était associé à la diminution en pause de la concentration minimale de CO2 ([CO2]min), qui était significativement corrélée au ralentissement du verdissement de la végétation et à l'extension de la longueur de la saison de croissance. Nous avons ensuite montré que la verdure de la végétation et la longueur de la saison de croissance étaient positivement corrélées avec la température du printemps mais pas celle de l'automne sur les terres du nord. En outre, de telles dépendances asymétriques de la croissance de la végétation sur la température du printemps et de l'automne ne peuvent pas être capturées par les modèles de biosphère terrestre de pointe. Ces résultats indiquent que les réponses de la croissance de la végétation au réchauffement du printemps et de l'automne sont asymétriques et soulignent la nécessité d'améliorer la phénologie de l'automne dans les modèles de prévision du cycle saisonnier de la concentration atmosphérique de CO2. El mayor crecimiento de la vegetación por el calentamiento climático desempeña un papel fundamental en la amplificación del ciclo estacional del CO2 atmosférico en las tierras del norte (>50° N) desde la década de 1960. Sin embargo, la correlación entre el crecimiento de la vegetación, la temperatura y la amplitud estacional de la concentración atmosférica de CO2 se ha vuelto difícil de alcanzar con la tendencia creciente lenta del crecimiento de la vegetación y el control debilitado de la temperatura en la absorción de CO2 desde finales de la década de 1990. Aquí, con base en los registros de concentración de CO2 atmosférico in situ del sitio del observatorio de Barrow, encontramos una desaceleración en la tendencia creciente de la amplitud del CO2 atmosférico desde la década de 1990 hasta mediados de la década de 2000. Este fenómeno se asoció con la disminución pausada de la concentración mínima de CO2 ([CO2]min), que se correlacionó significativamente con la desaceleración del reverdecimiento de la vegetación y la extensión de la duración de la temporada de crecimiento. Luego demostramos que tanto el verdor de la vegetación como la duración de la temporada de crecimiento se correlacionaban positivamente con la temperatura de primavera pero no de otoño en las tierras del norte. Además, tales dependencias asimétricas del crecimiento de la vegetación en la temperatura de primavera y otoño no pueden ser capturadas por los modelos de biosfera terrestre de última generación. Estos hallazgos indican que las respuestas del crecimiento de la vegetación al calentamiento de primavera y otoño son asimétricas, y resaltan la necesidad de mejorar la fenología del otoño en los modelos para predecir el ciclo estacional de la concentración atmosférica de CO2. The enhanced vegetation growth by climate warming plays a pivotal role in amplifying the seasonal cycle of atmospheric CO2 at northern lands (>50° N) since 1960s. However, the correlation between vegetation growth, temperature and seasonal amplitude of atmospheric CO2 concentration have become elusive with the slowed increasing trend of vegetation growth and weakened temperature control on CO2 uptake since late 1990s. Here, based on in situ atmospheric CO2 concentration records from the Barrow observatory site, we found a slowdown in the increasing trend of the atmospheric CO2 amplitude from 1990s to mid-2000s. This phenomenon was associated with the paused decrease in the minimum CO2 concentration ([CO2]min), which was significantly correlated with the slowdown of vegetation greening and growing-season length extension. We then showed that both the vegetation greenness and growing-season length were positively correlated with spring but not autumn temperature over the northern lands. Furthermore, such asymmetric dependences of vegetation growth upon spring and autumn temperature cannot be captured by the state-of-art terrestrial biosphere models. These findings indicate that the responses of vegetation growth to spring and autumn warming are asymmetric, and highlight the need of improving autumn phenology in the models for predicting seasonal cycle of atmospheric CO2 concentration. يلعب نمو الغطاء النباتي المعزز بسبب الاحترار المناخي دورًا محوريًا في تضخيم الدورة الموسمية لثاني أكسيد الكربون في الغلاف الجوي في الأراضي الشمالية (>50درجة شمالًا) منذ الستينيات. ومع ذلك، فإن العلاقة بين نمو الغطاء النباتي ودرجة الحرارة والسعة الموسمية لتركيز ثاني أكسيد الكربون في الغلاف الجوي أصبحت بعيدة المنال مع تباطؤ الاتجاه المتزايد لنمو الغطاء النباتي وضعف التحكم في درجة الحرارة عند امتصاص ثاني أكسيد الكربون منذ أواخر التسعينيات. هنا، بناءً على سجلات تركيز ثاني أكسيد الكربون في الغلاف الجوي في الموقع من موقع مرصد بارو، وجدنا تباطؤًا في الاتجاه المتزايد لسعة ثاني أكسيد الكربون في الغلاف الجوي من التسعينيات إلى منتصف العقد الأول من القرن الحادي والعشرين. ارتبطت هذه الظاهرة بالانخفاض المتوقف مؤقتًا في الحد الأدنى لتركيز ثاني أكسيد الكربون ([CO2]min)، والذي ارتبط بشكل كبير بتباطؤ تخضير الغطاء النباتي وتمديد طول موسم النمو. ثم أظهرنا أن كل من خضرة الغطاء النباتي وطول موسم النمو كانا مرتبطين بشكل إيجابي مع درجة حرارة الربيع ولكن ليس الخريف على الأراضي الشمالية. علاوة على ذلك، لا يمكن التقاط الاعتمادات غير المتماثلة لنمو الغطاء النباتي على درجة حرارة الربيع والخريف من خلال نماذج المحيط الحيوي الأرضية الحديثة. تشير هذه النتائج إلى أن استجابات نمو الغطاء النباتي لارتفاع درجة حرارة الربيع والخريف غير متماثلة، وتسلط الضوء على الحاجة إلى تحسين فينولوجيا الخريف في نماذج التنبؤ بالدورة الموسمية لتركيز ثاني أكسيد الكربون في الغلاف الجوي.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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    Environmental Research Letters
    Article . 2018 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
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    Environmental Research Letters
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    Environmental Research Letters
    Article . 2018
    Data sources: DOAJ
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://dx.doi.org/10.60692/6w...
    Other literature type . 2018
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    https://dx.doi.org/10.60692/jp...
    Other literature type . 2018
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Environmental Research Letters
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      Environmental Research Letters
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      Environmental Research Letters
      Article . 2018
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      https://dx.doi.org/10.60692/6w...
      Other literature type . 2018
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      https://dx.doi.org/10.60692/jp...
      Other literature type . 2018
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Yaxing Wei; Yongwen Liu; Yongwen Liu; Daniel J. Hayes; +33 Authors

    AbstractPlants use only a fraction of their photosynthetically derived carbon for biomass production (BP). The biomass production efficiency (BPE), defined as the ratio of BP to photosynthesis, and its variation across and within vegetation types is poorly understood, which hinders our capacity to accurately estimate carbon turnover times and carbon sinks. Here, we present a new global estimation of BPE obtained by combining field measurements from 113 sites with 14 carbon cycle models. Our best estimate of global BPE is 0.41 ± 0.05, excluding cropland. The largest BPE is found in boreal forests (0.48 ± 0.06) and the lowest in tropical forests (0.40 ± 0.04). Carbon cycle models overestimate BPE, although models with carbon–nitrogen interactions tend to be more realistic. Using observation‐based estimates of global photosynthesis, we quantify the global BP of non‐cropland ecosystems of 41 ± 6 Pg C/year. This flux is less than net primary production as it does not contain carbon allocated to symbionts, used for exudates or volatile carbon compound emissions to the atmosphere. Our study reveals a positive bias of 24 ± 11% in the model‐estimated BP (10 of 14 models). When correcting models for this bias while leaving modeled carbon turnover times unchanged, we found that the global ecosystem carbon storage change during the last century is decreased by 67% (or 58 Pg C).

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Global Change Biolog...arrow_drop_down
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    Global Change Biology
    Article . 2019 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Global Change Biolog...arrow_drop_down
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Global Change Biology
      Article . 2019 . Peer-reviewed
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    Authors: Akihiko Ito; Motoko Inatomi; D. N. Huntzinger; Christopher R. Schwalm; +28 Authors

    L'amplitude du cycle saisonnier (ACS) du taux d'échange dioxyde de carbone (CO2) atmosphère-écosystème est une mesure utile de la réactivité de la biosphère terrestre aux variations environnementales. Il n'est cependant pas clair quels mécanismes sous-jacents sont responsables de la tendance à la hausse observée du SCA dans la concentration atmosphérique de CO2. À l'aide des données de sortie du Multi-scale Terrestrial Model Intercomparison Project (MsTMIP), nous avons étudié dans quelle mesure le SCA de l'échange de CO2 atmosphère-écosystème a été simulé avec 15 modèles d'écosystèmes terrestres contemporains au cours de la période 1901–2010. En outre, nous avons tenté d'évaluer les contributions de mécanismes potentiels tels que le CO2 atmosphérique, le climat, l'utilisation des terres et les dépôts d'azote, à l'aide d'expériences factorielles utilisant différentes combinaisons de données de forçage. Dans des conditions contemporaines, le SCA simulé à l'échelle mondiale du flux net cumulé de carbone de l'écosystème de la plupart des modèles était comparable en ampleur au SCA des concentrations atmosphériques de CO2. Les résultats des expériences de simulation factorielle ont montré que le CO2 atmosphérique élevé exerçait une forte influence sur l'amplification de la saisonnalité. Lorsque le modèle a pris en compte non seulement le changement climatique, mais également les changements dans l'utilisation des terres et le CO2 atmosphérique, la majorité des modèles ont montré des tendances d'amplification des SCA de la photosynthèse, de la respiration et de la production nette de l'écosystème (+0,19 % à +0,50 % an−1). Dans le cas du changement d'affectation des terres, il était difficile de séparer la contribution de la gestion agricole au SCA en raison des insuffisances des données et des modèles. L'amplification simulée de l'ACS était approximativement compatible avec les preuves observationnelles de l'ACS dans les concentrations atmosphériques de CO2. De grandes différences entre les modèles sont toutefois restées dans les tendances mondiales simulées et les schémas spatiaux des échanges de CO2. D'autres études sont nécessaires pour identifier une explication cohérente des tendances d'amplification simulées et observées, y compris leurs mécanismes sous-jacents. Néanmoins, cette étude impliquait que la surveillance de la saisonnalité des écosystèmes fournirait des informations utiles sur la dynamique des écosystèmes. La amplitud del ciclo estacional (ACE) del tipo de cambio atmósfera-dióxido de carbono (CO2) del ecosistema es una métrica útil de la capacidad de respuesta de la biosfera terrestre a las variaciones ambientales. Sin embargo, no está claro qué mecanismos subyacentes son responsables de la tendencia creciente observada de SCA en la concentración atmosférica de CO2. Utilizando los datos de salida del Proyecto de Intercomparación de Modelos Terrestres Multiescala (MsTMIP), investigamos qué tan bien se simuló el SCA del intercambio de CO2 entre la atmósfera y el ecosistema con 15 modelos de ecosistemas terrestres contemporáneos durante el período 1901–2010. Además, intentamos evaluar las contribuciones de posibles mecanismos como el CO2 atmosférico, el clima, el uso de la tierra y la deposición de nitrógeno, a través de experimentos factoriales utilizando diferentes combinaciones de datos de forzamiento. En condiciones contemporáneas, el SCA simulado a escala global del flujo neto acumulado de carbono del ecosistema de la mayoría de los modelos fue comparable en magnitud con el SCA de las concentraciones atmosféricas de CO2. Los resultados de los experimentos de simulación factorial mostraron que el CO2 atmosférico elevado ejercía una fuerte influencia en la amplificación de la estacionalidad. Cuando el modelo consideró no solo el cambio climático, sino también el uso de la tierra y los cambios de CO2 atmosférico, la mayoría de los modelos mostraron tendencias de amplificación de los SCA de fotosíntesis, respiración y producción neta del ecosistema (+0,19 % a +0,50 % año−1). En el caso del cambio de uso de la tierra, fue difícil separar la contribución de la gestión agrícola a la ACS debido a las deficiencias tanto en los datos como en los modelos. La amplificación simulada de SCA fue aproximadamente consistente con la evidencia observada de SCA en concentraciones atmosféricas de CO2. Sin embargo, se mantuvieron grandes diferencias intermodales en las tendencias globales simuladas y los patrones espaciales de los intercambios de CO2. Se requieren más estudios para identificar una explicación coherente de las tendencias de amplificación simuladas y observadas, incluidos sus mecanismos subyacentes. Sin embargo, este estudio implicó que el monitoreo de la estacionalidad de los ecosistemas proporcionaría información útil sobre la dinámica de los ecosistemas. The seasonal-cycle amplitude (SCA) of the atmosphere–ecosystem carbon dioxide (CO2) exchange rate is a useful metric of the responsiveness of the terrestrial biosphere to environmental variations. It is unclear, however, what underlying mechanisms are responsible for the observed increasing trend of SCA in atmospheric CO2 concentration. Using output data from the Multi-scale Terrestrial Model Intercomparison Project (MsTMIP), we investigated how well the SCA of atmosphere–ecosystem CO2 exchange was simulated with 15 contemporary terrestrial ecosystem models during the period 1901–2010. Also, we made attempt to evaluate the contributions of potential mechanisms such as atmospheric CO2, climate, land-use, and nitrogen deposition, through factorial experiments using different combinations of forcing data. Under contemporary conditions, the simulated global-scale SCA of the cumulative net ecosystem carbon flux of most models was comparable in magnitude with the SCA of atmospheric CO2 concentrations. Results from factorial simulation experiments showed that elevated atmospheric CO2 exerted a strong influence on the seasonality amplification. When the model considered not only climate change but also land-use and atmospheric CO2 changes, the majority of the models showed amplification trends of the SCAs of photosynthesis, respiration, and net ecosystem production (+0.19 % to +0.50 % yr−1). In the case of land-use change, it was difficult to separate the contribution of agricultural management to SCA because of inadequacies in both the data and models. The simulated amplification of SCA was approximately consistent with the observational evidence of the SCA in atmospheric CO2 concentrations. Large inter-model differences remained, however, in the simulated global tendencies and spatial patterns of CO2 exchanges. Further studies are required to identify a consistent explanation for the simulated and observed amplification trends, including their underlying mechanisms. Nevertheless, this study implied that monitoring of ecosystem seasonality would provide useful insights concerning ecosystem dynamics. تعد سعة الدورة الموسمية (SCA) لسعر صرف ثاني أكسيد الكربون في النظام البيئي للغلاف الجوي (CO2) مقياسًا مفيدًا لاستجابة المحيط الحيوي الأرضي للتغيرات البيئية. ومع ذلك، ليس من الواضح ما هي الآليات الأساسية المسؤولة عن الاتجاه المتزايد الملحوظ في تركيز ثاني أكسيد الكربون في الغلاف الجوي. باستخدام بيانات المخرجات من مشروع المقارنة البينية للنموذج الأرضي متعدد المقاييس (MsTMIP)، قمنا بالتحقيق في مدى محاكاة تبادل ثاني أكسيد الكربون في الغلاف الجوي مع 15 نموذجًا معاصرًا للنظام الإيكولوجي الأرضي خلال الفترة 1901–2010. كما حاولنا تقييم مساهمات الآليات المحتملة مثل ثاني أكسيد الكربون في الغلاف الجوي والمناخ واستخدام الأراضي وترسب النيتروجين، من خلال تجارب العوامل باستخدام مجموعات مختلفة من فرض البيانات. في ظل الظروف المعاصرة، كانت محاكاة تركيز ثاني أكسيد الكربون على المستوى العالمي لتدفق الكربون الصافي التراكمي للنظام الإيكولوجي لمعظم النماذج قابلة للمقارنة من حيث الحجم مع تركيزات ثاني أكسيد الكربون في الغلاف الجوي. أظهرت نتائج تجارب محاكاة العوامل أن ارتفاع ثاني أكسيد الكربون في الغلاف الجوي كان له تأثير قوي على التضخيم الموسمي. عندما نظر النموذج ليس فقط في تغير المناخ ولكن أيضًا في استخدام الأراضي وتغيرات ثاني أكسيد الكربون في الغلاف الجوي، أظهرت غالبية النماذج اتجاهات تضخيم SCAs للتمثيل الضوئي والتنفس وصافي إنتاج النظام البيئي (+0.19 ٪ إلى +0.50 ٪ سنة-1). في حالة تغيير استخدام الأراضي، كان من الصعب فصل مساهمة الإدارة الزراعية في هيئة الأوراق المالية والسلع بسبب أوجه القصور في كل من البيانات والنماذج. كان التضخيم المحاكى لـ SCA متسقًا تقريبًا مع الأدلة الرصدية لـ SCA في تركيزات ثاني أكسيد الكربون في الغلاف الجوي. ومع ذلك، لا تزال هناك اختلافات كبيرة بين النماذج في الاتجاهات العالمية المحاكاة والأنماط المكانية لتبادل ثاني أكسيد الكربون. هناك حاجة إلى مزيد من الدراسات لتحديد تفسير متسق لاتجاهات التضخيم المحاكاة والملاحظة، بما في ذلك آلياتها الأساسية. ومع ذلك، أشارت هذه الدراسة إلى أن رصد موسمية النظام الإيكولوجي من شأنه أن يوفر رؤى مفيدة بشأن ديناميات النظام الإيكولوجي.

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    Authors: Yuanyuan Fang; A. M. Michalak; Christopher R. Schwalm; D. N. Huntzinger; +22 Authors

    La variabilidad climática asociada con El Niño-Oscilación del Sur (Enos) y sus consiguientes impactos en la variabilidad interanual del sumidero de carbono terrestre se ha utilizado como base para investigar las respuestas del ciclo del carbono a la variabilidad climática de manera más amplia y para informar la sensibilidad del presupuesto de carbono tropical al cambio climático. Estudios anteriores han presentado puntos de vista opuestos sobre si la temperatura o la precipitación es el factor principal que impulsa la respuesta del sumidero de carbono terrestre a Enos. Aquí, mostramos que el controlador dominante varía con la fase ENSO. Mientras que la temperatura tropical explica la dinámica del sumidero después de las condiciones de El Niño (rTG,P = 0,59, p < 0,01), el sumidero posterior a La Niña es impulsado en gran medida por la precipitación tropical (rPG,T =-0,46, p = 0,04). Este hallazgo apunta a una interacción dependiente de la fase ENSO entre la disponibilidad de agua y la temperatura en el control de la respuesta de absorción de carbono a las variaciones climáticas en los ecosistemas tropicales. Además, encontramos que ninguno de un conjunto de diez modelos de biosfera terrestre contemporáneos captura estas respuestas dependientes de la fase ENSO, lo que destaca una incertidumbre clave en el modelado de los impactos climáticos en el futuro del sumidero mundial de carbono terrestre. La variabilité climatique associée à l'oscillation australe El Niño (ENSO) et ses impacts sur la variabilité interannuelle des puits de carbone terrestres ont été utilisés comme base pour étudier les réponses du cycle du carbone à la variabilité climatique plus largement, et pour informer la sensibilité du budget carbone tropical au changement climatique. Des études antérieures ont présenté des points de vue opposés sur la question de savoir si la température ou les précipitations sont le principal facteur déterminant la réponse du puits de carbone terrestre à l'ENSO. Ici, nous montrons que le facteur dominant varie avec la phase ENSO. Alors que la température tropicale explique la dynamique du puits suite aux conditions El Niño (rTG,P = 0,59, p < 0,01), le puits post La Niña est largement entraîné par les précipitations tropicales (rPG,T = −0,46, p = 0,04). Cette constatation indique une interaction dépendante de la phase ENSO entre la disponibilité de l'eau et la température dans le contrôle de la réponse de l'absorption de carbone aux variations climatiques dans les écosystèmes tropicaux. Nous constatons en outre qu'aucun des dix modèles contemporains de la biosphère terrestre ne capture ces réponses dépendantes de la phase ENSO, mettant en évidence une incertitude clé dans la modélisation des impacts climatiques sur l'avenir du puits de carbone terrestre mondial. Climate variability associated with the El Niño-Southern Oscillation (ENSO) and its consequent impacts on land carbon sink interannual variability have been used as a basis for investigating carbon cycle responses to climate variability more broadly, and to inform the sensitivity of the tropical carbon budget to climate change. Past studies have presented opposing views about whether temperature or precipitation is the primary factor driving the response of the land carbon sink to ENSO. Here, we show that the dominant driver varies with ENSO phase. Whereas tropical temperature explains sink dynamics following El Niño conditions (rTG,P = 0.59, p < 0.01), the post La Niña sink is driven largely by tropical precipitation (rPG,T = −0.46, p = 0.04). This finding points to an ENSO-phase-dependent interplay between water availability and temperature in controlling the carbon uptake response to climate variations in tropical ecosystems. We further find that none of a suite of ten contemporary terrestrial biosphere models captures these ENSO-phase-dependent responses, highlighting a key uncertainty in modeling climate impacts on the future of the global land carbon sink. تم استخدام التقلبات المناخية المرتبطة بالتذبذب الجنوبي لظاهرة النينيو (ENSO) وما يترتب عليها من آثار على التقلبات السنوية لمصارف الكربون الأرضية كأساس للتحقيق في استجابات دورة الكربون لتقلبات المناخ على نطاق أوسع، ولإبلاغ حساسية ميزانية الكربون المدارية لتغير المناخ. قدمت الدراسات السابقة وجهات نظر متعارضة حول ما إذا كانت درجة الحرارة أو هطول الأمطار هي العامل الرئيسي الذي يدفع استجابة بالوعة الكربون الأرضية إلى ENSO. هنا، نظهر أن المحرك المهيمن يختلف باختلاف مرحلة ENSO. في حين أن درجة الحرارة المدارية تفسر ديناميكيات الحوض بعد ظروف النينيو (rTG،P = 0.59، P < 0.01)، فإن حوض ما بعد النينيا مدفوع إلى حد كبير بهطول الأمطار المدارية (rPG،T = -0.46، P = 0.04). تشير هذه النتيجة إلى تفاعل يعتمد على مرحلة ENSO بين توافر المياه ودرجة الحرارة في التحكم في استجابة امتصاص الكربون للتغيرات المناخية في النظم الإيكولوجية المدارية. كما نجد أن أياً من مجموعة من عشرة نماذج معاصرة للمحيط الحيوي الأرضي لا يلتقط هذه الاستجابات التي تعتمد على مرحلة ENSO، مما يسلط الضوء على عدم اليقين الرئيسي في نمذجة التأثيرات المناخية على مستقبل بالوعة الكربون الأرضية العالمية.

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    Environmental Research Letters
    Article . 2017 . Peer-reviewed
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    Environmental Research Letters
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    Environmental Research Letters
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      Environmental Research Letters
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    Authors: Yutao Wang; Atul K. Jain; Shih-Chieh Kao; Joshua B. Fisher; +21 Authors

    Le ruissellement aux États-Unis est en train de changer, et cette étude constate que le changement mesuré dépend de la région géographique et varie selon les saisons. Plus précisément, le ruissellement annuel total observé avait une tendance à la hausse insignifiante aux États-Unis entre 1950 et 2010, mais cette insignifiance était due à l'hétérogénéité régionale avec des augmentations significatives et insignifiantes dans l'est, le nord et le sud des États-Unis, et une plus grande diminution significative dans l'ouest des États-Unis. Les tendances du ruissellement moyen saisonnier variaient également d'une région à l'autre. Par région, la saison avec la plus grande tendance observée a été l'automne pour l'est (positif), le printemps pour le nord (positif), l'hiver pour le sud (positif), l'hiver pour l'ouest (négatif) et l'automne pour l'ensemble des États-Unis (positif). Sur la base de l'analyse de détection et d'attribution utilisant des observations de ruissellement de WaterWatch maillées ainsi que des simulations de modèles semi-factoriels de surface terrestre du Projet de comparaison interlaboratoires de modèles terrestres et de synthèse multi-échelles (MsTMIP), nous avons constaté que, bien que les rôles de la concentration de CO2, des dépôts d'azote, de l'utilisation des terres et de la couverture terrestre soient incohérents sur les plans régional et saisonnier, l'effet des variations climatiques a été détecté pour toutes les régions et saisons, et le changement de ruissellement pourrait être attribué au changement climatique en été et en automne dans le sud et en automne dans l'ouest. Nous avons également constaté que les simulations transitoires climatiques et historiques sous-estimaient systématiquement les tendances de ruissellement, peut-être en raison d'un biais de précipitations dans le pilote MsTMIP ou dans les modèles eux-mêmes. La escorrentía en los Estados Unidos está cambiando, y este estudio encuentra que el cambio medido depende de la región geográfica y varía estacionalmente. Específicamente, la escorrentía total anual observada tuvo una tendencia creciente insignificante en los Estados Unidos entre 1950 y 2010, pero esta insignificancia se debió a la heterogeneidad regional con aumentos significativos e insignificantes en el este, norte y sur de los Estados Unidos, y una mayor disminución significativa en el oeste de los Estados Unidos. Las tendencias de la escorrentía media estacional también difirieron entre las regiones. Por regiones, la temporada con mayor tendencia observada fue el otoño para el este (positivo), la primavera para el norte (positivo), el invierno para el sur (positivo), el invierno para el oeste (negativo) y el otoño para el conjunto de Estados Unidos (positivo). Con base en el análisis de detección y atribución utilizando observaciones de escorrentía de WaterWatch cuadriculadas junto con simulaciones de modelos de superficie terrestre semifactoriales del Proyecto de Intercomparación de Modelos Terrestres y Síntesis Multiescala (MsTMIP), encontramos que si bien los roles de la concentración de CO2, la deposición de nitrógeno y el uso de la tierra y la cobertura de la tierra fueron inconsistentes regional y estacionalmente, el efecto de las variaciones climáticas se detectó para todas las regiones y estaciones, y el cambio en la escorrentía podría atribuirse al cambio climático en verano y otoño en el sur y en otoño en el oeste. También encontramos que las simulaciones transitorias históricas y solo climáticas subestimaron constantemente las tendencias de escorrentía, posiblemente debido al sesgo de precipitación en el impulsor del MsTMIP o dentro de los propios modelos. Runoff in the United States is changing, and this study finds that the measured change is dependent on the geographic region and varies seasonally. Specifically, observed annual total runoff had an insignificant increasing trend in the US between 1950 and 2010, but this insignificance was due to regional heterogeneity with both significant and insignificant increases in the eastern, northern, and southern US, and a greater significant decrease in the western US. Trends for seasonal mean runoff also differed across regions. By region, the season with the largest observed trend was autumn for the east (positive), spring for the north (positive), winter for the south (positive), winter for the west (negative), and autumn for the US as a whole (positive). Based on the detection and attribution analysis using gridded WaterWatch runoff observations along with semi-factorial land surface model simulations from the Multi-scale Synthesis and Terrestrial Model Intercomparison Project (MsTMIP), we found that while the roles of CO2 concentration, nitrogen deposition, and land use and land cover were inconsistent regionally and seasonally, the effect of climatic variations was detected for all regions and seasons, and the change in runoff could be attributed to climate change in summer and autumn in the south and in autumn in the west. We also found that the climate-only and historical transient simulations consistently underestimated the runoff trends, possibly due to precipitation bias in the MsTMIP driver or within the models themselves. تتغير الجريان السطحي في الولايات المتحدة، وتجد هذه الدراسة أن التغيير المقاس يعتمد على المنطقة الجغرافية ويختلف موسمياً. على وجه التحديد، كان للجريان السطحي الإجمالي السنوي الملحوظ اتجاه تصاعدي ضئيل في الولايات المتحدة بين عامي 1950 و 2010، ولكن هذه الأهمية كانت بسبب عدم التجانس الإقليمي مع زيادات كبيرة وغير مهمة في شرق وشمال وجنوب الولايات المتحدة، وانخفاض كبير أكبر في غرب الولايات المتحدة. كما اختلفت اتجاهات متوسط الجريان السطحي الموسمي عبر المناطق. حسب المنطقة، كان الموسم الذي شهد أكبر اتجاه ملحوظ هو الخريف للشرق (إيجابي)، والربيع للشمال (إيجابي)، والشتاء للجنوب (إيجابي)، والشتاء للغرب (سلبي)، والخريف للولايات المتحدة ككل (إيجابي). استنادًا إلى تحليل الكشف والإسناد باستخدام ملاحظات جريان المياه الشبكية جنبًا إلى جنب مع محاكاة نموذج سطح الأرض شبه المصنع من مشروع التوليف متعدد المقاييس ومقارنة النموذج الأرضي (MsTMIP)، وجدنا أنه في حين أن أدوار تركيز ثاني أكسيد الكربون وترسب النيتروجين واستخدام الأراضي والغطاء الأرضي كانت غير متسقة إقليميًا وموسميًا، فقد تم اكتشاف تأثير التغيرات المناخية لجميع المناطق والمواسم، ويمكن أن يعزى التغير في الجريان السطحي إلى تغير المناخ في الصيف والخريف في الجنوب والخريف في الغرب. وجدنا أيضًا أن المحاكاة العابرة للمناخ فقط والتاريخية قللت باستمرار من اتجاهات الجريان السطحي، ربما بسبب التحيز لهطول الأمطار في محرك MsTMIP أو داخل النماذج نفسها.

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    Environmental Research Letters
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      Environmental Research Letters
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    Authors: Fabienne Maignan; Kevin Schaefer; Joshua B. Fisher; Anthony W. King; +24 Authors

    AbstractTerrestrial ecosystems play a vital role in regulating the accumulation of carbon (C) in the atmosphere. Understanding the factors controlling land C uptake is critical for reducing uncertainties in projections of future climate. The relative importance of changing climate, rising atmospheric CO2, and other factors, however, remains unclear despite decades of research. Here, we use an ensemble of land models to show that models disagree on the primary driver of cumulative C uptake for 85% of vegetated land area. Disagreement is largest in model sensitivity to rising atmospheric CO2 which shows almost twice the variability in cumulative land uptake since 1901 (1 s.d. of 212.8 PgC vs. 138.5 PgC, respectively). We find that variability in CO2 and temperature sensitivity is attributable, in part, to their compensatory effects on C uptake, whereby comparable estimates of C uptake can arise by invoking different sensitivities to key environmental conditions. Conversely, divergent estimates of C uptake can occur despite being based on the same environmental sensitivities. Together, these findings imply an important limitation to the predictability of C cycling and climate under unprecedented environmental conditions. We suggest that the carbon modeling community prioritize a probabilistic multi-model approach to generate more robust C cycle projections.

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    Scientific Reports
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      Scientific Reports
      Article . 2017
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    Authors: Jiafu Mao; Wenting Fu; Xiaoying Shi; D. M. Ricciuto; +37 Authors

    Nous avons examiné les contrôles naturels et anthropiques sur les changements de l'évapotranspiration terrestre (ET) de 1982 à 2010 en utilisant de multiples estimations à partir d'ensembles de données de télédétection et de modèles de surface terrestre orientés processus. Une tendance à la hausse significative de l'ET dans chaque hémisphère a été constamment révélée par des données contraintes par l'observation et des ensembles multimodèles qui considéraient les facteurs naturels et anthropiques historiques. Les impacts climatiques ont été simulés pour déterminer les variations spatio-temporelles de l'ET. À l'échelle mondiale, l'augmentation du CO2 s'est classée au deuxième rang de ces modèles après les influences climatiques prédominantes et a entraîné une diminution des tendances en matière de transpiration de la canopée et d'ET, en particulier pour les forêts tropicales et les terres arbustives de haute latitude. L'augmentation des dépôts d'azote a légèrement amplifié l'ET global via une croissance accrue des plantes. Les réponses ET induites par l'utilisation des terres, bien qu'avec des incertitudes substantielles dans l'analyse factorielle, étaient mineures à l'échelle mondiale, mais prononcées localement, en particulier dans les régions avec des changements intensifs de la couverture terrestre. Notre étude souligne l'importance d'utiliser des estimations multi-flux d'ET et de composantes d'ET pour quantifier l'empreinte anthropique de renforcement dans le cycle hydrologique mondial. Examinamos los controles naturales y antropogénicos sobre los cambios de evapotranspiración terrestre (ET) de 1982 a 2010 utilizando múltiples estimaciones de conjuntos de datos basados en teledetección y modelos de superficie terrestre orientados a procesos. Una tendencia creciente significativa de ET en cada hemisferio fue revelada consistentemente por datos restringidos observacionalmente y conjuntos multimodelo que consideraron impulsores históricos naturales y antropogénicos. Los impactos climáticos se simularon para determinar las variaciones espaciotemporales en ET. A nivel mundial, el aumento de CO2 ocupó el segundo lugar en estos modelos después de las influencias climáticas predominantes, y produjo tendencias decrecientes en la transpiración del dosel y ET, especialmente para los bosques tropicales y las tierras de arbustos de alta latitud. El aumento de la deposición de nitrógeno amplificó ligeramente la ET global a través del crecimiento mejorado de las plantas. Las respuestas ET inducidas por el uso de la tierra, aunque con incertidumbres sustanciales en todo el análisis factorial, fueron menores a nivel mundial, pero pronunciadas a nivel local, particularmente en regiones con cambios intensivos en la cobertura terrestre. Nuestro estudio destaca la importancia de emplear estimaciones de múltiples corrientes ET y componentes ET para cuantificar el fortalecimiento de la huella dactilar antropogénica en el ciclo hidrológico global. قمنا بفحص الضوابط الطبيعية والبشرية على تغيرات التبخر والنتح الأرضي (ET) من عام 1982 إلى عام 2010 باستخدام تقديرات متعددة من مجموعات البيانات القائمة على الاستشعار عن بعد ونماذج سطح الأرض الموجهة نحو العمليات. تم الكشف باستمرار عن اتجاه متزايد كبير للكائنات الفضائية في كل نصف كرة من خلال البيانات المقيدة بالملاحظة والمجموعات متعددة النماذج التي تعتبر محركات طبيعية وبشرية المنشأ تاريخية. تمت محاكاة التأثيرات المناخية لتحديد الاختلافات المكانية والزمانية في المخلوقات الفضائية. على الصعيد العالمي، احتل ارتفاع ثاني أكسيد الكربون المرتبة الثانية في هذه النماذج بعد التأثيرات المناخية السائدة، وأسفر عن اتجاهات متناقصة في نتح المظلة والمخلوقات الفضائية، خاصة بالنسبة للغابات الاستوائية وأراضي الشجيرات على خطوط العرض العالية. أدت زيادة ترسب النيتروجين إلى تضخيم المخلوقات الفضائية العالمية قليلاً عن طريق تعزيز نمو النبات. كانت استجابات المخلوقات الفضائية الناجمة عن استخدام الأراضي، وإن كان ذلك مع وجود أوجه عدم يقين كبيرة عبر تحليل العوامل، طفيفة على مستوى العالم، ولكنها كانت واضحة محليًا، لا سيما في المناطق التي تشهد تغيرات مكثفة في الغطاء الأرضي. تسلط دراستنا الضوء على أهمية استخدام تقديرات المخلوقات الفضائية ومكوناتها متعددة الدفق لقياس البصمة البشرية القوية في الدورة الهيدرولوجية العالمية. We examined natural and anthropogenic controls on terrestrial evapotranspiration (ET) changes from 1982 to 2010 using multiple estimates from remote sensing-based datasets and process-oriented land surface models. A significant increasing trend of ET in each hemisphere was consistently revealed by observationally-constrained data and multi-model ensembles that considered historic natural and anthropogenic drivers. The climate impacts were simulated to determine the spatiotemporal variations in ET. Globally, rising CO2 ranked second in these models after the predominant climatic influences, and yielded decreasing trends in canopy transpiration and ET, especially for tropical forests and high-latitude shrub land. Increasing nitrogen deposition slightly amplified global ET via enhanced plant growth. Land-use-induced ET responses, albeit with substantial uncertainties across the factorial analysis, were minor globally, but pronounced locally, particularly over regions with intensive land-cover changes. Our study highlights the importance of employing multi-stream ET and ET-component estimates to quantify the strengthening anthropogenic fingerprint in the global hydrologic cycle.

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    Environmental Research Letters
    Article . 2015 . Peer-reviewed
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    Authors: Xiaodong Chen; Dennis P. Lettenmaier; Sergey Marchenko; Daniel J. Hayes; +37 Authors

    AbstractA significant portion of the large amount of carbon (C) currently stored in soils of the permafrost region in the Northern Hemisphere has the potential to be emitted as the greenhouse gases CO2 and CH4 under a warmer climate. In this study we evaluated the variability in the sensitivity of permafrost and C in recent decades among land surface model simulations over the permafrost region between 1960 and 2009. The 15 model simulations all predict a loss of near‐surface permafrost (within 3 m) area over the region, but there are large differences in the magnitude of the simulated rates of loss among the models (0.2 to 58.8 × 103 km2 yr−1). Sensitivity simulations indicated that changes in air temperature largely explained changes in permafrost area, although interactions among changes in other environmental variables also played a role. All of the models indicate that both vegetation and soil C storage together have increased by 156 to 954 Tg C yr−1 between 1960 and 2009 over the permafrost region even though model analyses indicate that warming alone would decrease soil C storage. Increases in gross primary production (GPP) largely explain the simulated increases in vegetation and soil C. The sensitivity of GPP to increases in atmospheric CO2 was the dominant cause of increases in GPP across the models, but comparison of simulated GPP trends across the 1982–2009 period with that of a global GPP data set indicates that all of the models overestimate the trend in GPP. Disturbance also appears to be an important factor affecting C storage, as models that consider disturbance had lower increases in C storage than models that did not consider disturbance. To improve the modeling of C in the permafrost region, there is the need for the modeling community to standardize structural representation of permafrost and carbon dynamics among models that are used to evaluate the permafrost C feedback and for the modeling and observational communities to jointly develop data sets and methodologies to more effectively benchmark models.

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    Global Biogeochemical Cycles
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    Global Biogeochemical Cycles
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      Global Biogeochemical Cycles
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    Authors: Daniel J. Hayes; Oliver L. Phillips; Pekka E. Kauppi; Philippe Ciais; +15 Authors

    Net average global annual uptake of atmospheric carbon dioxide by forests was 1.1 petagrams of carbon, roughly one-sixth of fossil fuel emissions.

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    Article . 2011 . Peer-reviewed
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    Article . 2011
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9 Research products
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Xiangming Xiao; Lifen Jiang; Junyi Liang; Anders Ahlström; +20 Authors

    La croissance accrue de la végétation par le réchauffement climatique joue un rôle central dans l'amplification du cycle saisonnier du CO2 atmosphérique sur les terres nordiques (>50° N) depuis les années 1960. Cependant, la corrélation entre la croissance de la végétation, la température et l'amplitude saisonnière de la concentration de CO2 atmosphérique est devenue insaisissable avec le ralentissement de la tendance à la hausse de la croissance de la végétation et l'affaiblissement du contrôle de la température sur l'absorption de CO2 depuis la fin des années 1990. Ici, sur la base des enregistrements de concentration de CO2 atmosphérique in situ du site de l'observatoire Barrow, nous avons constaté un ralentissement de la tendance à la hausse de l'amplitude du CO2 atmosphérique des années 1990 au milieu des années 2000. Ce phénomène était associé à la diminution en pause de la concentration minimale de CO2 ([CO2]min), qui était significativement corrélée au ralentissement du verdissement de la végétation et à l'extension de la longueur de la saison de croissance. Nous avons ensuite montré que la verdure de la végétation et la longueur de la saison de croissance étaient positivement corrélées avec la température du printemps mais pas celle de l'automne sur les terres du nord. En outre, de telles dépendances asymétriques de la croissance de la végétation sur la température du printemps et de l'automne ne peuvent pas être capturées par les modèles de biosphère terrestre de pointe. Ces résultats indiquent que les réponses de la croissance de la végétation au réchauffement du printemps et de l'automne sont asymétriques et soulignent la nécessité d'améliorer la phénologie de l'automne dans les modèles de prévision du cycle saisonnier de la concentration atmosphérique de CO2. El mayor crecimiento de la vegetación por el calentamiento climático desempeña un papel fundamental en la amplificación del ciclo estacional del CO2 atmosférico en las tierras del norte (>50° N) desde la década de 1960. Sin embargo, la correlación entre el crecimiento de la vegetación, la temperatura y la amplitud estacional de la concentración atmosférica de CO2 se ha vuelto difícil de alcanzar con la tendencia creciente lenta del crecimiento de la vegetación y el control debilitado de la temperatura en la absorción de CO2 desde finales de la década de 1990. Aquí, con base en los registros de concentración de CO2 atmosférico in situ del sitio del observatorio de Barrow, encontramos una desaceleración en la tendencia creciente de la amplitud del CO2 atmosférico desde la década de 1990 hasta mediados de la década de 2000. Este fenómeno se asoció con la disminución pausada de la concentración mínima de CO2 ([CO2]min), que se correlacionó significativamente con la desaceleración del reverdecimiento de la vegetación y la extensión de la duración de la temporada de crecimiento. Luego demostramos que tanto el verdor de la vegetación como la duración de la temporada de crecimiento se correlacionaban positivamente con la temperatura de primavera pero no de otoño en las tierras del norte. Además, tales dependencias asimétricas del crecimiento de la vegetación en la temperatura de primavera y otoño no pueden ser capturadas por los modelos de biosfera terrestre de última generación. Estos hallazgos indican que las respuestas del crecimiento de la vegetación al calentamiento de primavera y otoño son asimétricas, y resaltan la necesidad de mejorar la fenología del otoño en los modelos para predecir el ciclo estacional de la concentración atmosférica de CO2. The enhanced vegetation growth by climate warming plays a pivotal role in amplifying the seasonal cycle of atmospheric CO2 at northern lands (>50° N) since 1960s. However, the correlation between vegetation growth, temperature and seasonal amplitude of atmospheric CO2 concentration have become elusive with the slowed increasing trend of vegetation growth and weakened temperature control on CO2 uptake since late 1990s. Here, based on in situ atmospheric CO2 concentration records from the Barrow observatory site, we found a slowdown in the increasing trend of the atmospheric CO2 amplitude from 1990s to mid-2000s. This phenomenon was associated with the paused decrease in the minimum CO2 concentration ([CO2]min), which was significantly correlated with the slowdown of vegetation greening and growing-season length extension. We then showed that both the vegetation greenness and growing-season length were positively correlated with spring but not autumn temperature over the northern lands. Furthermore, such asymmetric dependences of vegetation growth upon spring and autumn temperature cannot be captured by the state-of-art terrestrial biosphere models. These findings indicate that the responses of vegetation growth to spring and autumn warming are asymmetric, and highlight the need of improving autumn phenology in the models for predicting seasonal cycle of atmospheric CO2 concentration. يلعب نمو الغطاء النباتي المعزز بسبب الاحترار المناخي دورًا محوريًا في تضخيم الدورة الموسمية لثاني أكسيد الكربون في الغلاف الجوي في الأراضي الشمالية (>50درجة شمالًا) منذ الستينيات. ومع ذلك، فإن العلاقة بين نمو الغطاء النباتي ودرجة الحرارة والسعة الموسمية لتركيز ثاني أكسيد الكربون في الغلاف الجوي أصبحت بعيدة المنال مع تباطؤ الاتجاه المتزايد لنمو الغطاء النباتي وضعف التحكم في درجة الحرارة عند امتصاص ثاني أكسيد الكربون منذ أواخر التسعينيات. هنا، بناءً على سجلات تركيز ثاني أكسيد الكربون في الغلاف الجوي في الموقع من موقع مرصد بارو، وجدنا تباطؤًا في الاتجاه المتزايد لسعة ثاني أكسيد الكربون في الغلاف الجوي من التسعينيات إلى منتصف العقد الأول من القرن الحادي والعشرين. ارتبطت هذه الظاهرة بالانخفاض المتوقف مؤقتًا في الحد الأدنى لتركيز ثاني أكسيد الكربون ([CO2]min)، والذي ارتبط بشكل كبير بتباطؤ تخضير الغطاء النباتي وتمديد طول موسم النمو. ثم أظهرنا أن كل من خضرة الغطاء النباتي وطول موسم النمو كانا مرتبطين بشكل إيجابي مع درجة حرارة الربيع ولكن ليس الخريف على الأراضي الشمالية. علاوة على ذلك، لا يمكن التقاط الاعتمادات غير المتماثلة لنمو الغطاء النباتي على درجة حرارة الربيع والخريف من خلال نماذج المحيط الحيوي الأرضية الحديثة. تشير هذه النتائج إلى أن استجابات نمو الغطاء النباتي لارتفاع درجة حرارة الربيع والخريف غير متماثلة، وتسلط الضوء على الحاجة إلى تحسين فينولوجيا الخريف في نماذج التنبؤ بالدورة الموسمية لتركيز ثاني أكسيد الكربون في الغلاف الجوي.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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    Environmental Research Letters
    Article . 2018 . Peer-reviewed
    License: CC BY
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    Environmental Research Letters
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    Environmental Research Letters
    Article . 2018
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    https://dx.doi.org/10.60692/6w...
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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      Environmental Research Letters
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      https://dx.doi.org/10.60692/6w...
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Yaxing Wei; Yongwen Liu; Yongwen Liu; Daniel J. Hayes; +33 Authors

    AbstractPlants use only a fraction of their photosynthetically derived carbon for biomass production (BP). The biomass production efficiency (BPE), defined as the ratio of BP to photosynthesis, and its variation across and within vegetation types is poorly understood, which hinders our capacity to accurately estimate carbon turnover times and carbon sinks. Here, we present a new global estimation of BPE obtained by combining field measurements from 113 sites with 14 carbon cycle models. Our best estimate of global BPE is 0.41 ± 0.05, excluding cropland. The largest BPE is found in boreal forests (0.48 ± 0.06) and the lowest in tropical forests (0.40 ± 0.04). Carbon cycle models overestimate BPE, although models with carbon–nitrogen interactions tend to be more realistic. Using observation‐based estimates of global photosynthesis, we quantify the global BP of non‐cropland ecosystems of 41 ± 6 Pg C/year. This flux is less than net primary production as it does not contain carbon allocated to symbionts, used for exudates or volatile carbon compound emissions to the atmosphere. Our study reveals a positive bias of 24 ± 11% in the model‐estimated BP (10 of 14 models). When correcting models for this bias while leaving modeled carbon turnover times unchanged, we found that the global ecosystem carbon storage change during the last century is decreased by 67% (or 58 Pg C).

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Global Change Biolog...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Global Change Biology
    Article . 2019 . Peer-reviewed
    License: Wiley Online Library User Agreement
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      Global Change Biology
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    Authors: Akihiko Ito; Motoko Inatomi; D. N. Huntzinger; Christopher R. Schwalm; +28 Authors

    L'amplitude du cycle saisonnier (ACS) du taux d'échange dioxyde de carbone (CO2) atmosphère-écosystème est une mesure utile de la réactivité de la biosphère terrestre aux variations environnementales. Il n'est cependant pas clair quels mécanismes sous-jacents sont responsables de la tendance à la hausse observée du SCA dans la concentration atmosphérique de CO2. À l'aide des données de sortie du Multi-scale Terrestrial Model Intercomparison Project (MsTMIP), nous avons étudié dans quelle mesure le SCA de l'échange de CO2 atmosphère-écosystème a été simulé avec 15 modèles d'écosystèmes terrestres contemporains au cours de la période 1901–2010. En outre, nous avons tenté d'évaluer les contributions de mécanismes potentiels tels que le CO2 atmosphérique, le climat, l'utilisation des terres et les dépôts d'azote, à l'aide d'expériences factorielles utilisant différentes combinaisons de données de forçage. Dans des conditions contemporaines, le SCA simulé à l'échelle mondiale du flux net cumulé de carbone de l'écosystème de la plupart des modèles était comparable en ampleur au SCA des concentrations atmosphériques de CO2. Les résultats des expériences de simulation factorielle ont montré que le CO2 atmosphérique élevé exerçait une forte influence sur l'amplification de la saisonnalité. Lorsque le modèle a pris en compte non seulement le changement climatique, mais également les changements dans l'utilisation des terres et le CO2 atmosphérique, la majorité des modèles ont montré des tendances d'amplification des SCA de la photosynthèse, de la respiration et de la production nette de l'écosystème (+0,19 % à +0,50 % an−1). Dans le cas du changement d'affectation des terres, il était difficile de séparer la contribution de la gestion agricole au SCA en raison des insuffisances des données et des modèles. L'amplification simulée de l'ACS était approximativement compatible avec les preuves observationnelles de l'ACS dans les concentrations atmosphériques de CO2. De grandes différences entre les modèles sont toutefois restées dans les tendances mondiales simulées et les schémas spatiaux des échanges de CO2. D'autres études sont nécessaires pour identifier une explication cohérente des tendances d'amplification simulées et observées, y compris leurs mécanismes sous-jacents. Néanmoins, cette étude impliquait que la surveillance de la saisonnalité des écosystèmes fournirait des informations utiles sur la dynamique des écosystèmes. La amplitud del ciclo estacional (ACE) del tipo de cambio atmósfera-dióxido de carbono (CO2) del ecosistema es una métrica útil de la capacidad de respuesta de la biosfera terrestre a las variaciones ambientales. Sin embargo, no está claro qué mecanismos subyacentes son responsables de la tendencia creciente observada de SCA en la concentración atmosférica de CO2. Utilizando los datos de salida del Proyecto de Intercomparación de Modelos Terrestres Multiescala (MsTMIP), investigamos qué tan bien se simuló el SCA del intercambio de CO2 entre la atmósfera y el ecosistema con 15 modelos de ecosistemas terrestres contemporáneos durante el período 1901–2010. Además, intentamos evaluar las contribuciones de posibles mecanismos como el CO2 atmosférico, el clima, el uso de la tierra y la deposición de nitrógeno, a través de experimentos factoriales utilizando diferentes combinaciones de datos de forzamiento. En condiciones contemporáneas, el SCA simulado a escala global del flujo neto acumulado de carbono del ecosistema de la mayoría de los modelos fue comparable en magnitud con el SCA de las concentraciones atmosféricas de CO2. Los resultados de los experimentos de simulación factorial mostraron que el CO2 atmosférico elevado ejercía una fuerte influencia en la amplificación de la estacionalidad. Cuando el modelo consideró no solo el cambio climático, sino también el uso de la tierra y los cambios de CO2 atmosférico, la mayoría de los modelos mostraron tendencias de amplificación de los SCA de fotosíntesis, respiración y producción neta del ecosistema (+0,19 % a +0,50 % año−1). En el caso del cambio de uso de la tierra, fue difícil separar la contribución de la gestión agrícola a la ACS debido a las deficiencias tanto en los datos como en los modelos. La amplificación simulada de SCA fue aproximadamente consistente con la evidencia observada de SCA en concentraciones atmosféricas de CO2. Sin embargo, se mantuvieron grandes diferencias intermodales en las tendencias globales simuladas y los patrones espaciales de los intercambios de CO2. Se requieren más estudios para identificar una explicación coherente de las tendencias de amplificación simuladas y observadas, incluidos sus mecanismos subyacentes. Sin embargo, este estudio implicó que el monitoreo de la estacionalidad de los ecosistemas proporcionaría información útil sobre la dinámica de los ecosistemas. The seasonal-cycle amplitude (SCA) of the atmosphere–ecosystem carbon dioxide (CO2) exchange rate is a useful metric of the responsiveness of the terrestrial biosphere to environmental variations. It is unclear, however, what underlying mechanisms are responsible for the observed increasing trend of SCA in atmospheric CO2 concentration. Using output data from the Multi-scale Terrestrial Model Intercomparison Project (MsTMIP), we investigated how well the SCA of atmosphere–ecosystem CO2 exchange was simulated with 15 contemporary terrestrial ecosystem models during the period 1901–2010. Also, we made attempt to evaluate the contributions of potential mechanisms such as atmospheric CO2, climate, land-use, and nitrogen deposition, through factorial experiments using different combinations of forcing data. Under contemporary conditions, the simulated global-scale SCA of the cumulative net ecosystem carbon flux of most models was comparable in magnitude with the SCA of atmospheric CO2 concentrations. Results from factorial simulation experiments showed that elevated atmospheric CO2 exerted a strong influence on the seasonality amplification. When the model considered not only climate change but also land-use and atmospheric CO2 changes, the majority of the models showed amplification trends of the SCAs of photosynthesis, respiration, and net ecosystem production (+0.19 % to +0.50 % yr−1). In the case of land-use change, it was difficult to separate the contribution of agricultural management to SCA because of inadequacies in both the data and models. The simulated amplification of SCA was approximately consistent with the observational evidence of the SCA in atmospheric CO2 concentrations. Large inter-model differences remained, however, in the simulated global tendencies and spatial patterns of CO2 exchanges. Further studies are required to identify a consistent explanation for the simulated and observed amplification trends, including their underlying mechanisms. Nevertheless, this study implied that monitoring of ecosystem seasonality would provide useful insights concerning ecosystem dynamics. تعد سعة الدورة الموسمية (SCA) لسعر صرف ثاني أكسيد الكربون في النظام البيئي للغلاف الجوي (CO2) مقياسًا مفيدًا لاستجابة المحيط الحيوي الأرضي للتغيرات البيئية. ومع ذلك، ليس من الواضح ما هي الآليات الأساسية المسؤولة عن الاتجاه المتزايد الملحوظ في تركيز ثاني أكسيد الكربون في الغلاف الجوي. باستخدام بيانات المخرجات من مشروع المقارنة البينية للنموذج الأرضي متعدد المقاييس (MsTMIP)، قمنا بالتحقيق في مدى محاكاة تبادل ثاني أكسيد الكربون في الغلاف الجوي مع 15 نموذجًا معاصرًا للنظام الإيكولوجي الأرضي خلال الفترة 1901–2010. كما حاولنا تقييم مساهمات الآليات المحتملة مثل ثاني أكسيد الكربون في الغلاف الجوي والمناخ واستخدام الأراضي وترسب النيتروجين، من خلال تجارب العوامل باستخدام مجموعات مختلفة من فرض البيانات. في ظل الظروف المعاصرة، كانت محاكاة تركيز ثاني أكسيد الكربون على المستوى العالمي لتدفق الكربون الصافي التراكمي للنظام الإيكولوجي لمعظم النماذج قابلة للمقارنة من حيث الحجم مع تركيزات ثاني أكسيد الكربون في الغلاف الجوي. أظهرت نتائج تجارب محاكاة العوامل أن ارتفاع ثاني أكسيد الكربون في الغلاف الجوي كان له تأثير قوي على التضخيم الموسمي. عندما نظر النموذج ليس فقط في تغير المناخ ولكن أيضًا في استخدام الأراضي وتغيرات ثاني أكسيد الكربون في الغلاف الجوي، أظهرت غالبية النماذج اتجاهات تضخيم SCAs للتمثيل الضوئي والتنفس وصافي إنتاج النظام البيئي (+0.19 ٪ إلى +0.50 ٪ سنة-1). في حالة تغيير استخدام الأراضي، كان من الصعب فصل مساهمة الإدارة الزراعية في هيئة الأوراق المالية والسلع بسبب أوجه القصور في كل من البيانات والنماذج. كان التضخيم المحاكى لـ SCA متسقًا تقريبًا مع الأدلة الرصدية لـ SCA في تركيزات ثاني أكسيد الكربون في الغلاف الجوي. ومع ذلك، لا تزال هناك اختلافات كبيرة بين النماذج في الاتجاهات العالمية المحاكاة والأنماط المكانية لتبادل ثاني أكسيد الكربون. هناك حاجة إلى مزيد من الدراسات لتحديد تفسير متسق لاتجاهات التضخيم المحاكاة والملاحظة، بما في ذلك آلياتها الأساسية. ومع ذلك، أشارت هذه الدراسة إلى أن رصد موسمية النظام الإيكولوجي من شأنه أن يوفر رؤى مفيدة بشأن ديناميات النظام الإيكولوجي.

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    Authors: Yuanyuan Fang; A. M. Michalak; Christopher R. Schwalm; D. N. Huntzinger; +22 Authors

    La variabilidad climática asociada con El Niño-Oscilación del Sur (Enos) y sus consiguientes impactos en la variabilidad interanual del sumidero de carbono terrestre se ha utilizado como base para investigar las respuestas del ciclo del carbono a la variabilidad climática de manera más amplia y para informar la sensibilidad del presupuesto de carbono tropical al cambio climático. Estudios anteriores han presentado puntos de vista opuestos sobre si la temperatura o la precipitación es el factor principal que impulsa la respuesta del sumidero de carbono terrestre a Enos. Aquí, mostramos que el controlador dominante varía con la fase ENSO. Mientras que la temperatura tropical explica la dinámica del sumidero después de las condiciones de El Niño (rTG,P = 0,59, p < 0,01), el sumidero posterior a La Niña es impulsado en gran medida por la precipitación tropical (rPG,T =-0,46, p = 0,04). Este hallazgo apunta a una interacción dependiente de la fase ENSO entre la disponibilidad de agua y la temperatura en el control de la respuesta de absorción de carbono a las variaciones climáticas en los ecosistemas tropicales. Además, encontramos que ninguno de un conjunto de diez modelos de biosfera terrestre contemporáneos captura estas respuestas dependientes de la fase ENSO, lo que destaca una incertidumbre clave en el modelado de los impactos climáticos en el futuro del sumidero mundial de carbono terrestre. La variabilité climatique associée à l'oscillation australe El Niño (ENSO) et ses impacts sur la variabilité interannuelle des puits de carbone terrestres ont été utilisés comme base pour étudier les réponses du cycle du carbone à la variabilité climatique plus largement, et pour informer la sensibilité du budget carbone tropical au changement climatique. Des études antérieures ont présenté des points de vue opposés sur la question de savoir si la température ou les précipitations sont le principal facteur déterminant la réponse du puits de carbone terrestre à l'ENSO. Ici, nous montrons que le facteur dominant varie avec la phase ENSO. Alors que la température tropicale explique la dynamique du puits suite aux conditions El Niño (rTG,P = 0,59, p < 0,01), le puits post La Niña est largement entraîné par les précipitations tropicales (rPG,T = −0,46, p = 0,04). Cette constatation indique une interaction dépendante de la phase ENSO entre la disponibilité de l'eau et la température dans le contrôle de la réponse de l'absorption de carbone aux variations climatiques dans les écosystèmes tropicaux. Nous constatons en outre qu'aucun des dix modèles contemporains de la biosphère terrestre ne capture ces réponses dépendantes de la phase ENSO, mettant en évidence une incertitude clé dans la modélisation des impacts climatiques sur l'avenir du puits de carbone terrestre mondial. Climate variability associated with the El Niño-Southern Oscillation (ENSO) and its consequent impacts on land carbon sink interannual variability have been used as a basis for investigating carbon cycle responses to climate variability more broadly, and to inform the sensitivity of the tropical carbon budget to climate change. Past studies have presented opposing views about whether temperature or precipitation is the primary factor driving the response of the land carbon sink to ENSO. Here, we show that the dominant driver varies with ENSO phase. Whereas tropical temperature explains sink dynamics following El Niño conditions (rTG,P = 0.59, p < 0.01), the post La Niña sink is driven largely by tropical precipitation (rPG,T = −0.46, p = 0.04). This finding points to an ENSO-phase-dependent interplay between water availability and temperature in controlling the carbon uptake response to climate variations in tropical ecosystems. We further find that none of a suite of ten contemporary terrestrial biosphere models captures these ENSO-phase-dependent responses, highlighting a key uncertainty in modeling climate impacts on the future of the global land carbon sink. تم استخدام التقلبات المناخية المرتبطة بالتذبذب الجنوبي لظاهرة النينيو (ENSO) وما يترتب عليها من آثار على التقلبات السنوية لمصارف الكربون الأرضية كأساس للتحقيق في استجابات دورة الكربون لتقلبات المناخ على نطاق أوسع، ولإبلاغ حساسية ميزانية الكربون المدارية لتغير المناخ. قدمت الدراسات السابقة وجهات نظر متعارضة حول ما إذا كانت درجة الحرارة أو هطول الأمطار هي العامل الرئيسي الذي يدفع استجابة بالوعة الكربون الأرضية إلى ENSO. هنا، نظهر أن المحرك المهيمن يختلف باختلاف مرحلة ENSO. في حين أن درجة الحرارة المدارية تفسر ديناميكيات الحوض بعد ظروف النينيو (rTG،P = 0.59، P < 0.01)، فإن حوض ما بعد النينيا مدفوع إلى حد كبير بهطول الأمطار المدارية (rPG،T = -0.46، P = 0.04). تشير هذه النتيجة إلى تفاعل يعتمد على مرحلة ENSO بين توافر المياه ودرجة الحرارة في التحكم في استجابة امتصاص الكربون للتغيرات المناخية في النظم الإيكولوجية المدارية. كما نجد أن أياً من مجموعة من عشرة نماذج معاصرة للمحيط الحيوي الأرضي لا يلتقط هذه الاستجابات التي تعتمد على مرحلة ENSO، مما يسلط الضوء على عدم اليقين الرئيسي في نمذجة التأثيرات المناخية على مستقبل بالوعة الكربون الأرضية العالمية.

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    Environmental Research Letters
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      Environmental Research Letters
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    Authors: Yutao Wang; Atul K. Jain; Shih-Chieh Kao; Joshua B. Fisher; +21 Authors

    Le ruissellement aux États-Unis est en train de changer, et cette étude constate que le changement mesuré dépend de la région géographique et varie selon les saisons. Plus précisément, le ruissellement annuel total observé avait une tendance à la hausse insignifiante aux États-Unis entre 1950 et 2010, mais cette insignifiance était due à l'hétérogénéité régionale avec des augmentations significatives et insignifiantes dans l'est, le nord et le sud des États-Unis, et une plus grande diminution significative dans l'ouest des États-Unis. Les tendances du ruissellement moyen saisonnier variaient également d'une région à l'autre. Par région, la saison avec la plus grande tendance observée a été l'automne pour l'est (positif), le printemps pour le nord (positif), l'hiver pour le sud (positif), l'hiver pour l'ouest (négatif) et l'automne pour l'ensemble des États-Unis (positif). Sur la base de l'analyse de détection et d'attribution utilisant des observations de ruissellement de WaterWatch maillées ainsi que des simulations de modèles semi-factoriels de surface terrestre du Projet de comparaison interlaboratoires de modèles terrestres et de synthèse multi-échelles (MsTMIP), nous avons constaté que, bien que les rôles de la concentration de CO2, des dépôts d'azote, de l'utilisation des terres et de la couverture terrestre soient incohérents sur les plans régional et saisonnier, l'effet des variations climatiques a été détecté pour toutes les régions et saisons, et le changement de ruissellement pourrait être attribué au changement climatique en été et en automne dans le sud et en automne dans l'ouest. Nous avons également constaté que les simulations transitoires climatiques et historiques sous-estimaient systématiquement les tendances de ruissellement, peut-être en raison d'un biais de précipitations dans le pilote MsTMIP ou dans les modèles eux-mêmes. La escorrentía en los Estados Unidos está cambiando, y este estudio encuentra que el cambio medido depende de la región geográfica y varía estacionalmente. Específicamente, la escorrentía total anual observada tuvo una tendencia creciente insignificante en los Estados Unidos entre 1950 y 2010, pero esta insignificancia se debió a la heterogeneidad regional con aumentos significativos e insignificantes en el este, norte y sur de los Estados Unidos, y una mayor disminución significativa en el oeste de los Estados Unidos. Las tendencias de la escorrentía media estacional también difirieron entre las regiones. Por regiones, la temporada con mayor tendencia observada fue el otoño para el este (positivo), la primavera para el norte (positivo), el invierno para el sur (positivo), el invierno para el oeste (negativo) y el otoño para el conjunto de Estados Unidos (positivo). Con base en el análisis de detección y atribución utilizando observaciones de escorrentía de WaterWatch cuadriculadas junto con simulaciones de modelos de superficie terrestre semifactoriales del Proyecto de Intercomparación de Modelos Terrestres y Síntesis Multiescala (MsTMIP), encontramos que si bien los roles de la concentración de CO2, la deposición de nitrógeno y el uso de la tierra y la cobertura de la tierra fueron inconsistentes regional y estacionalmente, el efecto de las variaciones climáticas se detectó para todas las regiones y estaciones, y el cambio en la escorrentía podría atribuirse al cambio climático en verano y otoño en el sur y en otoño en el oeste. También encontramos que las simulaciones transitorias históricas y solo climáticas subestimaron constantemente las tendencias de escorrentía, posiblemente debido al sesgo de precipitación en el impulsor del MsTMIP o dentro de los propios modelos. Runoff in the United States is changing, and this study finds that the measured change is dependent on the geographic region and varies seasonally. Specifically, observed annual total runoff had an insignificant increasing trend in the US between 1950 and 2010, but this insignificance was due to regional heterogeneity with both significant and insignificant increases in the eastern, northern, and southern US, and a greater significant decrease in the western US. Trends for seasonal mean runoff also differed across regions. By region, the season with the largest observed trend was autumn for the east (positive), spring for the north (positive), winter for the south (positive), winter for the west (negative), and autumn for the US as a whole (positive). Based on the detection and attribution analysis using gridded WaterWatch runoff observations along with semi-factorial land surface model simulations from the Multi-scale Synthesis and Terrestrial Model Intercomparison Project (MsTMIP), we found that while the roles of CO2 concentration, nitrogen deposition, and land use and land cover were inconsistent regionally and seasonally, the effect of climatic variations was detected for all regions and seasons, and the change in runoff could be attributed to climate change in summer and autumn in the south and in autumn in the west. We also found that the climate-only and historical transient simulations consistently underestimated the runoff trends, possibly due to precipitation bias in the MsTMIP driver or within the models themselves. تتغير الجريان السطحي في الولايات المتحدة، وتجد هذه الدراسة أن التغيير المقاس يعتمد على المنطقة الجغرافية ويختلف موسمياً. على وجه التحديد، كان للجريان السطحي الإجمالي السنوي الملحوظ اتجاه تصاعدي ضئيل في الولايات المتحدة بين عامي 1950 و 2010، ولكن هذه الأهمية كانت بسبب عدم التجانس الإقليمي مع زيادات كبيرة وغير مهمة في شرق وشمال وجنوب الولايات المتحدة، وانخفاض كبير أكبر في غرب الولايات المتحدة. كما اختلفت اتجاهات متوسط الجريان السطحي الموسمي عبر المناطق. حسب المنطقة، كان الموسم الذي شهد أكبر اتجاه ملحوظ هو الخريف للشرق (إيجابي)، والربيع للشمال (إيجابي)، والشتاء للجنوب (إيجابي)، والشتاء للغرب (سلبي)، والخريف للولايات المتحدة ككل (إيجابي). استنادًا إلى تحليل الكشف والإسناد باستخدام ملاحظات جريان المياه الشبكية جنبًا إلى جنب مع محاكاة نموذج سطح الأرض شبه المصنع من مشروع التوليف متعدد المقاييس ومقارنة النموذج الأرضي (MsTMIP)، وجدنا أنه في حين أن أدوار تركيز ثاني أكسيد الكربون وترسب النيتروجين واستخدام الأراضي والغطاء الأرضي كانت غير متسقة إقليميًا وموسميًا، فقد تم اكتشاف تأثير التغيرات المناخية لجميع المناطق والمواسم، ويمكن أن يعزى التغير في الجريان السطحي إلى تغير المناخ في الصيف والخريف في الجنوب والخريف في الغرب. وجدنا أيضًا أن المحاكاة العابرة للمناخ فقط والتاريخية قللت باستمرار من اتجاهات الجريان السطحي، ربما بسبب التحيز لهطول الأمطار في محرك MsTMIP أو داخل النماذج نفسها.

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    Environmental Research Letters
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      Environmental Research Letters
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    Authors: Fabienne Maignan; Kevin Schaefer; Joshua B. Fisher; Anthony W. King; +24 Authors

    AbstractTerrestrial ecosystems play a vital role in regulating the accumulation of carbon (C) in the atmosphere. Understanding the factors controlling land C uptake is critical for reducing uncertainties in projections of future climate. The relative importance of changing climate, rising atmospheric CO2, and other factors, however, remains unclear despite decades of research. Here, we use an ensemble of land models to show that models disagree on the primary driver of cumulative C uptake for 85% of vegetated land area. Disagreement is largest in model sensitivity to rising atmospheric CO2 which shows almost twice the variability in cumulative land uptake since 1901 (1 s.d. of 212.8 PgC vs. 138.5 PgC, respectively). We find that variability in CO2 and temperature sensitivity is attributable, in part, to their compensatory effects on C uptake, whereby comparable estimates of C uptake can arise by invoking different sensitivities to key environmental conditions. Conversely, divergent estimates of C uptake can occur despite being based on the same environmental sensitivities. Together, these findings imply an important limitation to the predictability of C cycling and climate under unprecedented environmental conditions. We suggest that the carbon modeling community prioritize a probabilistic multi-model approach to generate more robust C cycle projections.

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    Authors: Jiafu Mao; Wenting Fu; Xiaoying Shi; D. M. Ricciuto; +37 Authors

    Nous avons examiné les contrôles naturels et anthropiques sur les changements de l'évapotranspiration terrestre (ET) de 1982 à 2010 en utilisant de multiples estimations à partir d'ensembles de données de télédétection et de modèles de surface terrestre orientés processus. Une tendance à la hausse significative de l'ET dans chaque hémisphère a été constamment révélée par des données contraintes par l'observation et des ensembles multimodèles qui considéraient les facteurs naturels et anthropiques historiques. Les impacts climatiques ont été simulés pour déterminer les variations spatio-temporelles de l'ET. À l'échelle mondiale, l'augmentation du CO2 s'est classée au deuxième rang de ces modèles après les influences climatiques prédominantes et a entraîné une diminution des tendances en matière de transpiration de la canopée et d'ET, en particulier pour les forêts tropicales et les terres arbustives de haute latitude. L'augmentation des dépôts d'azote a légèrement amplifié l'ET global via une croissance accrue des plantes. Les réponses ET induites par l'utilisation des terres, bien qu'avec des incertitudes substantielles dans l'analyse factorielle, étaient mineures à l'échelle mondiale, mais prononcées localement, en particulier dans les régions avec des changements intensifs de la couverture terrestre. Notre étude souligne l'importance d'utiliser des estimations multi-flux d'ET et de composantes d'ET pour quantifier l'empreinte anthropique de renforcement dans le cycle hydrologique mondial. Examinamos los controles naturales y antropogénicos sobre los cambios de evapotranspiración terrestre (ET) de 1982 a 2010 utilizando múltiples estimaciones de conjuntos de datos basados en teledetección y modelos de superficie terrestre orientados a procesos. Una tendencia creciente significativa de ET en cada hemisferio fue revelada consistentemente por datos restringidos observacionalmente y conjuntos multimodelo que consideraron impulsores históricos naturales y antropogénicos. Los impactos climáticos se simularon para determinar las variaciones espaciotemporales en ET. A nivel mundial, el aumento de CO2 ocupó el segundo lugar en estos modelos después de las influencias climáticas predominantes, y produjo tendencias decrecientes en la transpiración del dosel y ET, especialmente para los bosques tropicales y las tierras de arbustos de alta latitud. El aumento de la deposición de nitrógeno amplificó ligeramente la ET global a través del crecimiento mejorado de las plantas. Las respuestas ET inducidas por el uso de la tierra, aunque con incertidumbres sustanciales en todo el análisis factorial, fueron menores a nivel mundial, pero pronunciadas a nivel local, particularmente en regiones con cambios intensivos en la cobertura terrestre. Nuestro estudio destaca la importancia de emplear estimaciones de múltiples corrientes ET y componentes ET para cuantificar el fortalecimiento de la huella dactilar antropogénica en el ciclo hidrológico global. قمنا بفحص الضوابط الطبيعية والبشرية على تغيرات التبخر والنتح الأرضي (ET) من عام 1982 إلى عام 2010 باستخدام تقديرات متعددة من مجموعات البيانات القائمة على الاستشعار عن بعد ونماذج سطح الأرض الموجهة نحو العمليات. تم الكشف باستمرار عن اتجاه متزايد كبير للكائنات الفضائية في كل نصف كرة من خلال البيانات المقيدة بالملاحظة والمجموعات متعددة النماذج التي تعتبر محركات طبيعية وبشرية المنشأ تاريخية. تمت محاكاة التأثيرات المناخية لتحديد الاختلافات المكانية والزمانية في المخلوقات الفضائية. على الصعيد العالمي، احتل ارتفاع ثاني أكسيد الكربون المرتبة الثانية في هذه النماذج بعد التأثيرات المناخية السائدة، وأسفر عن اتجاهات متناقصة في نتح المظلة والمخلوقات الفضائية، خاصة بالنسبة للغابات الاستوائية وأراضي الشجيرات على خطوط العرض العالية. أدت زيادة ترسب النيتروجين إلى تضخيم المخلوقات الفضائية العالمية قليلاً عن طريق تعزيز نمو النبات. كانت استجابات المخلوقات الفضائية الناجمة عن استخدام الأراضي، وإن كان ذلك مع وجود أوجه عدم يقين كبيرة عبر تحليل العوامل، طفيفة على مستوى العالم، ولكنها كانت واضحة محليًا، لا سيما في المناطق التي تشهد تغيرات مكثفة في الغطاء الأرضي. تسلط دراستنا الضوء على أهمية استخدام تقديرات المخلوقات الفضائية ومكوناتها متعددة الدفق لقياس البصمة البشرية القوية في الدورة الهيدرولوجية العالمية. We examined natural and anthropogenic controls on terrestrial evapotranspiration (ET) changes from 1982 to 2010 using multiple estimates from remote sensing-based datasets and process-oriented land surface models. A significant increasing trend of ET in each hemisphere was consistently revealed by observationally-constrained data and multi-model ensembles that considered historic natural and anthropogenic drivers. The climate impacts were simulated to determine the spatiotemporal variations in ET. Globally, rising CO2 ranked second in these models after the predominant climatic influences, and yielded decreasing trends in canopy transpiration and ET, especially for tropical forests and high-latitude shrub land. Increasing nitrogen deposition slightly amplified global ET via enhanced plant growth. Land-use-induced ET responses, albeit with substantial uncertainties across the factorial analysis, were minor globally, but pronounced locally, particularly over regions with intensive land-cover changes. Our study highlights the importance of employing multi-stream ET and ET-component estimates to quantify the strengthening anthropogenic fingerprint in the global hydrologic cycle.

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    Environmental Research Letters
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    Authors: Xiaodong Chen; Dennis P. Lettenmaier; Sergey Marchenko; Daniel J. Hayes; +37 Authors

    AbstractA significant portion of the large amount of carbon (C) currently stored in soils of the permafrost region in the Northern Hemisphere has the potential to be emitted as the greenhouse gases CO2 and CH4 under a warmer climate. In this study we evaluated the variability in the sensitivity of permafrost and C in recent decades among land surface model simulations over the permafrost region between 1960 and 2009. The 15 model simulations all predict a loss of near‐surface permafrost (within 3 m) area over the region, but there are large differences in the magnitude of the simulated rates of loss among the models (0.2 to 58.8 × 103 km2 yr−1). Sensitivity simulations indicated that changes in air temperature largely explained changes in permafrost area, although interactions among changes in other environmental variables also played a role. All of the models indicate that both vegetation and soil C storage together have increased by 156 to 954 Tg C yr−1 between 1960 and 2009 over the permafrost region even though model analyses indicate that warming alone would decrease soil C storage. Increases in gross primary production (GPP) largely explain the simulated increases in vegetation and soil C. The sensitivity of GPP to increases in atmospheric CO2 was the dominant cause of increases in GPP across the models, but comparison of simulated GPP trends across the 1982–2009 period with that of a global GPP data set indicates that all of the models overestimate the trend in GPP. Disturbance also appears to be an important factor affecting C storage, as models that consider disturbance had lower increases in C storage than models that did not consider disturbance. To improve the modeling of C in the permafrost region, there is the need for the modeling community to standardize structural representation of permafrost and carbon dynamics among models that are used to evaluate the permafrost C feedback and for the modeling and observational communities to jointly develop data sets and methodologies to more effectively benchmark models.

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    Global Biogeochemical Cycles
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    Authors: Daniel J. Hayes; Oliver L. Phillips; Pekka E. Kauppi; Philippe Ciais; +15 Authors

    Net average global annual uptake of atmospheric carbon dioxide by forests was 1.1 petagrams of carbon, roughly one-sixth of fossil fuel emissions.

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