气候变化领域集成服务门户(CCPortal): Drivers of river reactivation in North Africa during the last glacial cycle

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DOI	10.1038/s41561-020-00671-3
	Drivers of river reactivation in North Africa during the last glacial cycle
	Blanchet C.L.; Osborne A.H.; Tjallingii R.; Ehrmann W.; Friedrich T.; Timmermann A.; Brückmann W.; Frank M.
发表日期	2021
ISSN	17520894
起始页码	97
结束页码	103
卷号	14 期号:2
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.
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
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206863
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
推荐引用方式 GB/T 7714	Blanchet C.L.,Osborne A.H.,Tjallingii R.,et al. Drivers of river reactivation in North Africa during the last glacial cycle[J],2021,14(2).
APA	Blanchet C.L..,Osborne A.H..,Tjallingii R..,Ehrmann W..,Friedrich T..,...&Frank M..(2021).Drivers of river reactivation in North Africa during the last glacial cycle.Nature Geoscience,14(2).
MLA	Blanchet C.L.,et al."Drivers of river reactivation in North Africa during the last glacial cycle".Nature Geoscience 14.2(2021).