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

handle: 10261/363832
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.
- State University of New York at Potsdam United States
- Spanish National Research Council Spain
- Xi’an Jiaotong-Liverpool University China (People's Republic of)
- Museo Nacional de Ciencias Naturales Spain
- State University of New York at Potsdam United States
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
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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