Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America
Abstract A 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 oxyg...
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ftdoajarticles:oai:doaj.org/article:7b2614f061ea42a39c0c136c9f8522a2 2024-01-28T10:06:08+01:00 Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America V. M. Ramirez F. W. Cruz M. Vuille V. F. Novello N. M. Stríkis H. Cheng H. W. Zhang J. P. Bernal W. J. Du A. Ampuero M. Deininger C. M. Chiessi E. Tejedor J. L. Campos Y. Ait Brahim R. L. Edwards 2023-12-01T00:00:00Z https://doi.org/10.1038/s43247-023-01124-6 https://doaj.org/article/7b2614f061ea42a39c0c136c9f8522a2 EN eng Nature Portfolio https://doi.org/10.1038/s43247-023-01124-6 https://doaj.org/toc/2662-4435 doi:10.1038/s43247-023-01124-6 2662-4435 https://doaj.org/article/7b2614f061ea42a39c0c136c9f8522a2 Communications Earth & Environment, Vol 4, Iss 1, Pp 1-8 (2023) Geology QE1-996.5 Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.1038/s43247-023-01124-6 2023-12-31T01:48:46Z Abstract A 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. Article in Journal/Newspaper Greenland Directory of Open Access Journals: DOAJ Articles Greenland Communications Earth & Environment 4 1 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Environmental sciences GE1-350 |
spellingShingle |
Geology QE1-996.5 Environmental sciences GE1-350 V. M. Ramirez F. W. Cruz M. Vuille V. F. Novello N. M. Stríkis H. Cheng H. W. Zhang J. P. Bernal W. J. Du A. Ampuero M. Deininger C. M. Chiessi E. Tejedor J. L. Campos Y. Ait Brahim R. L. Edwards Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
topic_facet |
Geology QE1-996.5 Environmental sciences GE1-350 |
description |
Abstract A 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. |
format |
Article in Journal/Newspaper |
author |
V. M. Ramirez F. W. Cruz M. Vuille V. F. Novello N. M. Stríkis H. Cheng H. W. Zhang J. P. Bernal W. J. Du A. Ampuero M. Deininger C. M. Chiessi E. Tejedor J. L. Campos Y. Ait Brahim R. L. Edwards |
author_facet |
V. M. Ramirez F. W. Cruz M. Vuille V. F. Novello N. M. Stríkis H. Cheng H. W. Zhang J. P. Bernal W. J. Du A. Ampuero M. Deininger C. M. Chiessi E. Tejedor J. L. Campos Y. Ait Brahim R. L. Edwards |
author_sort |
V. M. Ramirez |
title |
Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
title_short |
Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
title_full |
Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
title_fullStr |
Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
title_full_unstemmed |
Summer insolation controlled movements of Intertropical Convergence Zone during last glacial cycle in northern South America |
title_sort |
summer insolation controlled movements of intertropical convergence zone during last glacial cycle in northern south america |
publisher |
Nature Portfolio |
publishDate |
2023 |
url |
https://doi.org/10.1038/s43247-023-01124-6 https://doaj.org/article/7b2614f061ea42a39c0c136c9f8522a2 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Communications Earth & Environment, Vol 4, Iss 1, Pp 1-8 (2023) |
op_relation |
https://doi.org/10.1038/s43247-023-01124-6 https://doaj.org/toc/2662-4435 doi:10.1038/s43247-023-01124-6 2662-4435 https://doaj.org/article/7b2614f061ea42a39c0c136c9f8522a2 |
op_doi |
https://doi.org/10.1038/s43247-023-01124-6 |
container_title |
Communications Earth & Environment |
container_volume |
4 |
container_issue |
1 |
_version_ |
1789332809883582464 |