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The spatiotemporal extent of the Green Sahara during the last glacial period

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Title
The spatiotemporal extent of the Green Sahara during the last glacial period
Author(s)
Ait Brahim, Yassine; Sha, Lijuan; Jasper A. Wassenburg; Azennoud, Khalil; Cheng, Hai; Cruz, Francisco W.; Bouchaou, Lhoussaine
Publication Date
2023-07
Journal
iScience, v.26, no.7
Publisher
Elsevier Inc.
Abstract
The Sahara Desert, one of today's most inhospitable environments, has known periods of enhanced precipitation that supported pre-historic humans. However, the Green Sahara timing and moisture sources are not well known due to limited paleoclimate information. Here, we present a multi-proxy (δ18O, δ13C, Δ17O, and trace elements) speleothem-based climate record from Northwest (NW) Africa. Our data document two Green Sahara periods during Marine Isotope Stage (MIS) 5a and the Early to Mid-Holocene. Consistency with paleoclimate records across North Africa highlights the east-west geographical extent of the Green Sahara, whereas millennial-scale North Atlantic cooling (Heinrich) events consistently resulted in drier conditions. We demonstrate that an increase in westerly-originating winter precipitation during MIS5a resulted in favorable environmental conditions. The comparison of paleoclimate data with local archaeological sequences highlights the abrupt climate deterioration and the decline in human density in NW Africa during the MIS5-4 transition, which suggests climate-forced dispersals of populations, with possible implications for pathways into Eurasia. © 2023 The Authors
URI
https://pr.ibs.re.kr/handle/8788114/13777
DOI
10.1016/j.isci.2023.107018
ISSN
2589-0042
Appears in Collections:
HiddenCommunity > 1. Journal Papers (저널논문)
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