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Orbital controls on eastern African hydroclimate in the Pleistocene

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dc.contributor.author Lupien, Rachel L
dc.contributor.author Russell, James M
dc.contributor.author Pearson, Emma J
dc.contributor.author Castañeda, Isla S
dc.contributor.author Asrat, Asfawossen
dc.contributor.author Foerster, Verena
dc.contributor.author Lamb, Henry F
dc.contributor.author Roberts, Helen M
dc.contributor.author Schäbitz, Frank
dc.contributor.author Trauth, Martin H
dc.contributor.author Beck, Catherine C
dc.contributor.author Feibel, Craig S
dc.contributor.author Cohen, Andrew S
dc.date.accessioned 2022-06-28T10:06:18Z
dc.date.available 2022-06-28T10:06:18Z
dc.date.issued 2022-02-24
dc.identifier.citation Lupien, R. L. et al. (2022) Orbital controls on eastern African hydroclimate in the Pleistocene. Scientific Reports, 12, 3170. https://doi.org/10.1038/s41598-022-06826-z en_US
dc.identifier.issn 2045-2322
dc.identifier.uri http://repository.biust.ac.bw/handle/123456789/460
dc.description.abstract 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. en_US
dc.language.iso en en_US
dc.publisher Springer Nature Limited en_US
dc.subject Geochemistry en_US
dc.subject Palaeoclimate en_US
dc.subject Eastern African en_US
dc.title Orbital controls on eastern African hydroclimate in the Pleistocene en_US
dc.description.level phd en_US
dc.description.accessibility unrestricted en_US
dc.description.department mge en_US


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