globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-00671-3
论文题名:
Drivers of river reactivation in North Africa during the last glacial cycle
作者: Blanchet C.L.; Osborne A.H.; Tjallingii R.; Ehrmann W.; Friedrich T.; Timmermann A.; Brückmann W.; Frank M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:2
起始页码: 97
结束页码: 103
语种: 英语
英文关键词: hydrometeorology ; interglacial ; marine isotope stage ; marine sediment ; Mediterranean environment ; paleoclimate ; provenance ; reactivation ; runoff ; sediment analysis ; structural control ; Gulf of Sirte ; Libyan Arab Jamahiriya ; Mediterranean Sea ; Sahara
英文摘要: North African greening phases, during which large rivers ran through the Sahara Desert, occurred repeatedly during the Quaternary and are regarded as key periods for the development of past human populations. However, the timing and mechanisms responsible for the reactivation of the presently dormant fluvial systems remain highly uncertain. Here we present hydroclimate changes over the past 160,000 years, reconstructed from analyses of the provenance of terrestrial sediments in a marine sediment record from the Gulf of Sirte (offshore Libya). By combining high-resolution proxy data with transient Earth system model simulations, we are able to identify the various drivers that led to the observed shifts in hydroclimate and landscapes. We show that river runoff occurred during warm interglacial phases of Marine Isotope Stages 1 and 5 due to precession-forced enhancements in the summer and autumn rainfall over the entire watershed, which fed presently dry river systems and intermittent coastal streams. In contrast, shorter-lasting and less-intense humid events during glacial Marine Isotope Stages 3 and 4 were related to autumn and winter precipitation over the Libyan coastal regions driven by Mediterranean storms. Our results reveal large shifts in hydroclimate environments during the last glacial cycle, which probably exerted a strong evolutionary and structural control on past human populations, potentially pacing their dispersal across northern Africa. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169719
Appears in Collections:气候变化与战略

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作者单位: Climate Dynamics and Landscape Evolution, Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department Ocean Systems, Royal Netherlands Institute for Sea Research NIOZ, ‘t Horntje (Texel), Netherlands; Institute for Geophysics and Geology, University Leipzig, Leipzig, Germany; Department of Oceanography, School of Ocean and Earth Sciences and Technology, University of Hawaii at Mānoa, Honolulu, HI, United States; Center for Climate Physics, Institute for Basic Science (IBS), Busan, South Korea; Pusan National University, Busan, South Korea

Recommended Citation:
Blanchet C.L.,Osborne A.H.,Tjallingii R.,et al. Drivers of river reactivation in North Africa during the last glacial cycle[J]. Nature Geoscience,2021-01-01,14(2)
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