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Orbital controls on eastern African hydroclimate in the Pleistocene
Understanding eastern African paleoclimate is critical for contextualizing early human evolution, adaptation, and dispersal, yet Pleistocene climate of this region and its governing mechanisms remain poorly understood due to the lack of long, orbitally-resolved, terrestrial paleoclimate records. Her...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8873222/ https://www.ncbi.nlm.nih.gov/pubmed/35210479 http://dx.doi.org/10.1038/s41598-022-06826-z |
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author | Lupien, Rachel L. Russell, James M. Pearson, Emma J. Castañeda, Isla S. Asrat, Asfawossen Foerster, Verena Lamb, Henry F. Roberts, Helen M. Schäbitz, Frank Trauth, Martin H. Beck, Catherine C. Feibel, Craig S. Cohen, Andrew S. |
author_facet | Lupien, Rachel L. Russell, James M. Pearson, Emma J. Castañeda, Isla S. Asrat, Asfawossen Foerster, Verena Lamb, Henry F. Roberts, Helen M. Schäbitz, Frank Trauth, Martin H. Beck, Catherine C. Feibel, Craig S. Cohen, Andrew S. |
author_sort | Lupien, Rachel L. |
collection | PubMed |
description | Understanding eastern African paleoclimate is critical for contextualizing early human evolution, adaptation, and dispersal, yet Pleistocene climate of this region and its governing mechanisms remain poorly understood due to the lack of long, orbitally-resolved, terrestrial paleoclimate records. Here we present leaf wax hydrogen isotope records of rainfall from paleolake sediment cores from key time windows that resolve long-term trends, variations, and high-latitude effects on tropical African precipitation. Eastern African rainfall was dominantly controlled by variations in low-latitude summer insolation during most of the early and middle Pleistocene, with little evidence that glacial–interglacial cycles impacted rainfall until the late Pleistocene. We observe the influence of high-latitude-driven climate processes emerging from the last interglacial (Marine Isotope Stage 5) to the present, an interval when glacial–interglacial cycles were strong and insolation forcing was weak. Our results demonstrate a variable response of eastern African rainfall to low-latitude insolation forcing and high-latitude-driven climate change, likely related to the relative strengths of these forcings through time and a threshold in monsoon sensitivity. We observe little difference in mean rainfall between the early, middle, and late Pleistocene, which suggests that orbitally-driven climate variations likely played a more significant role than gradual change in the relationship between early humans and their environment. |
format | Online Article Text |
id | pubmed-8873222 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-88732222022-02-25 Orbital controls on eastern African hydroclimate in the Pleistocene Lupien, Rachel L. Russell, James M. Pearson, Emma J. Castañeda, Isla S. Asrat, Asfawossen Foerster, Verena Lamb, Henry F. Roberts, Helen M. Schäbitz, Frank Trauth, Martin H. Beck, Catherine C. Feibel, Craig S. Cohen, Andrew S. Sci Rep Article Understanding eastern African paleoclimate is critical for contextualizing early human evolution, adaptation, and dispersal, yet Pleistocene climate of this region and its governing mechanisms remain poorly understood due to the lack of long, orbitally-resolved, terrestrial paleoclimate records. Here we present leaf wax hydrogen isotope records of rainfall from paleolake sediment cores from key time windows that resolve long-term trends, variations, and high-latitude effects on tropical African precipitation. Eastern African rainfall was dominantly controlled by variations in low-latitude summer insolation during most of the early and middle Pleistocene, with little evidence that glacial–interglacial cycles impacted rainfall until the late Pleistocene. We observe the influence of high-latitude-driven climate processes emerging from the last interglacial (Marine Isotope Stage 5) to the present, an interval when glacial–interglacial cycles were strong and insolation forcing was weak. Our results demonstrate a variable response of eastern African rainfall to low-latitude insolation forcing and high-latitude-driven climate change, likely related to the relative strengths of these forcings through time and a threshold in monsoon sensitivity. We observe little difference in mean rainfall between the early, middle, and late Pleistocene, which suggests that orbitally-driven climate variations likely played a more significant role than gradual change in the relationship between early humans and their environment. Nature Publishing Group UK 2022-02-24 /pmc/articles/PMC8873222/ /pubmed/35210479 http://dx.doi.org/10.1038/s41598-022-06826-z Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Lupien, Rachel L. Russell, James M. Pearson, Emma J. Castañeda, Isla S. Asrat, Asfawossen Foerster, Verena Lamb, Henry F. Roberts, Helen M. Schäbitz, Frank Trauth, Martin H. Beck, Catherine C. Feibel, Craig S. Cohen, Andrew S. Orbital controls on eastern African hydroclimate in the Pleistocene |
title | Orbital controls on eastern African hydroclimate in the Pleistocene |
title_full | Orbital controls on eastern African hydroclimate in the Pleistocene |
title_fullStr | Orbital controls on eastern African hydroclimate in the Pleistocene |
title_full_unstemmed | Orbital controls on eastern African hydroclimate in the Pleistocene |
title_short | Orbital controls on eastern African hydroclimate in the Pleistocene |
title_sort | orbital controls on eastern african hydroclimate in the pleistocene |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8873222/ https://www.ncbi.nlm.nih.gov/pubmed/35210479 http://dx.doi.org/10.1038/s41598-022-06826-z |
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