- EC| PAGE21 ,NSERC ,NSF| Methane loss from Arctic: towards an annual budget of CH4 emissions from tundra ecosystems across a latitudinal gradient ,NSF| BE/CBC: Biocomplexity Associated with the Response of Tundra Carbon Balance to Warming and Drying Across Multiple Spatial and Temporal Scales ,RCN| Greenhouse gases in the North: from local to regional scale ,NWO| Stability of carbon pools in far east Siberia ,EC| GREENCYCLESII ,NSF| Fire in Northern Alaska: Effect of a Changing Disturbance Regime on a Regional Macrosystem
Birger Ulf Hansen; Marcin Jackowicz-Korczynski;Birger Ulf Hansen
Harvested from ORCID Public Data FileBirger Ulf Hansen in OpenAIRE Torsten Sachs; Peter M. Lafleur; +16 AuthorsTorsten Sachs
Harvested from ORCID Public Data FileTorsten Sachs in OpenAIRE Birger Ulf Hansen; Marcin Jackowicz-Korczynski;Birger Ulf Hansen
Harvested from ORCID Public Data FileBirger Ulf Hansen in OpenAIRE Torsten Sachs; Peter M. Lafleur;Torsten Sachs
Harvested from ORCID Public Data FileTorsten Sachs in OpenAIRE Torben R. Christensen; Torben R. Christensen;Torben R. Christensen
Harvested from ORCID Public Data FileTorben R. Christensen in OpenAIRE Walter C. Oechel; Walter C. Oechel
Harvested from ORCID Public Data FileWalter C. Oechel in OpenAIRE Lars Kutzbach; Adrian V. Rocha;Lars Kutzbach
Harvested from ORCID Public Data FileLars Kutzbach in OpenAIRE Werner Eugster; Magnus Lund;Werner Eugster
Harvested from ORCID Public Data FileWerner Eugster in OpenAIRE M. K. van der Molen; Mika Aurela;M. K. van der Molen
Harvested from ORCID Public Data FileM. K. van der Molen in OpenAIRE Thomas Friborg; Thomas Friborg
Harvested from ORCID Public Data FileThomas Friborg in OpenAIRE Frans-Jan W. Parmentier; Frans-Jan W. Parmentier;Frans-Jan W. Parmentier
Harvested from ORCID Public Data FileFrans-Jan W. Parmentier in OpenAIRE Elyn Humphreys; Elyn Humphreys
Harvested from ORCID Public Data FileElyn Humphreys in OpenAIRE Daniel P. Rasse; Daniel P. Rasse
Harvested from ORCID Public Data FileDaniel P. Rasse in OpenAIRE Mikkel P. Tamstorf; Mikkel P. Tamstorf
Harvested from ORCID Public Data FileMikkel P. Tamstorf in OpenAIRE Herbert N. Mbufong; Herbert N. Mbufong
Harvested from ORCID Public Data FileHerbert N. Mbufong in OpenAIREAbstract. This paper aims to assess the spatial variability in the response of CO2 exchange to irradiance across the Arctic tundra during peak season using light response curve (LRC) parameters. This investigation allows us to better understand the future response of Arctic tundra under climatic change. Peak season data were collected during different years (between 1998 and 2010) using the micrometeorological eddy covariance technique from 12 circumpolar Arctic tundra sites, in the range of 64–74° N. The LRCs were generated for 14 days with peak net ecosystem exchange (NEE) using an NEE–irradiance model. Parameters from LRCs represent site-specific traits and characteristics describing the following: (a) NEE at light saturation (Fcsat), (b) dark respiration (Rd), (c) light use efficiency (α), (d) NEE when light is at 1000 μmol m−2 s−1 (Fc1000), (e) potential photosynthesis at light saturation (Psat) and (f) the light compensation point (LCP). Parameterization of LRCs was successful in predicting CO2 flux dynamics across the Arctic tundra. We did not find any trends in LRC parameters across the whole Arctic tundra but there were indications for temperature and latitudinal differences within sub-regions like Russia and Greenland. Together, leaf area index (LAI) and July temperature had a high explanatory power of the variance in assimilation parameters (Fcsat, Fc1000 and Psat, thus illustrating the potential for upscaling CO2 exchange for the whole Arctic tundra. Dark respiration was more variable and less correlated to environmental drivers than were assimilation parameters. This indicates the inherent need to include other parameters such as nutrient availability, substrate quantity and quality in flux monitoring activities.
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