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Communications Earth & Environment
Article . 2023 . Peer-reviewed
License: CC BY
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DIGITAL.CSIC
Article . 2024 . Peer-reviewed
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https://dx.doi.org/10.60692/ke...
Other literature type . 2023
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Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America

التحركات التي تسيطر عليها أشعة الشمس الصيفية لمنطقة التقارب المدارية خلال الدورة الجليدية الأخيرة في شمال أمريكا الجنوبية
Authors: V. M. Ramirez; Francisco W. Cruz; Mathias Vuille; Valdir F. Novello; Nicolás M. Stríkis; Hai Cheng; Haiwei Zhang; +9 Authors

Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America

Abstract

AbstractA paradigm in paleoclimatology holds that shifts in the mean position of the Intertropical Convergence Zone were the dominant climatic mechanism controlling rainfall in the tropics during the last glacial period. We present a new paleo-rainfall reconstruction based on speleothem stable oxygen isotopes record from Colombia, which spans most of the last glacial cycle. The strength and positioning of the Intertropical Convergence Zone over northern South America were more strongly affected by summer insolation at high northern latitudes than by local insolation during the last glacial cycle, resulting in an antiphased relationship with climate in the Cariaco Basin. Our data also provide new insight into how orbital forcing amplified/dampened Intertropical Convergence Zone precipitation during millennial-scale events. During Greenland Stadial events, the Intertropical Convergence Zone was positioned close to the latitude of El Peñon, as expressed by more negative δ18O values. Greenland Interstadial events are marked by relatively high stable oxygen isotope values and reduced rainfall in the El Peñon record, suggesting a northward withdrawal of the Intertropical Convergence Zone. During some Heinrich Stadial events, and especially Heinrich Stadial 1, the Intertropical Convergence Zone must have been displaced away from its modern location near El Peñon, as conditions were very dry at both El Peñon and Cariaco.

Country
Spain
Keywords

Atmospheric Science, Cave, Precipitation, Oceanography, Meteorology, Convergence zone, Climate change, GE1-350, Paleoclimatology, Climatology, QE1-996.5, Geodynamics of the Northern Andes and Caribbean Region, Last Glacial Maximum, Geography, Stadial, Paleontology, Geology, FOS: Earth and related environmental sciences, Solar Influence, Speleothem, Glacial period, Environmental sciences, Earth and Planetary Sciences, Climate Change and Paleoclimatology, Geophysics, Archaeology, Physical Sciences, Geodynamic Evolution of Western Mediterranean Region, Intertropical Convergence Zone

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citations
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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