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The spatiotemporal extent of the Green Sahara during the last glacial period.
Ait Brahim, Yassine; Sha, Lijuan; Wassenburg, Jasper A; Azennoud, Khalil; Cheng, Hai; Cruz, Francisco W; Bouchaou, Lhoussaine.
Afiliação
  • Ait Brahim Y; International Water Research Institute, Mohammed VI Polytechnic University, Benguerir, Morocco.
  • Sha L; Institute of Global Environmental Change, Xi'an Jiaotong Uniersity, Xi'an, China.
  • Wassenburg JA; Center for Climate Physics, Institute for Basic Science, Busan, 46241, Republic of Korea.
  • Azennoud K; Pusan National University, Busan, 46241, Republic of Korea.
  • Cheng H; International Water Research Institute, Mohammed VI Polytechnic University, Benguerir, Morocco.
  • Cruz FW; Institute of Global Environmental Change, Xi'an Jiaotong Uniersity, Xi'an, China.
  • Bouchaou L; Instituto de Geociências, University of Sao Paulo, Sao Paulo, Brazil.
iScience ; 26(7): 107018, 2023 Jul 21.
Article em En | MEDLINE | ID: mdl-37416475
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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article