干旱区生态环境知识资源中心(Arid): Drivers of river reactivation in North Africa during the last glacial cycle

Arid

DOI	10.1038/s41561-020-00671-3
	Drivers of river reactivation in North Africa during the last glacial cycle
	Blanchet, Cecile L.; Osborne, Anne H.; Tjallingii, Rik; Ehrmann, Werner; Friedrich, Tobias; Timmermann, Axel; Brueckmann, Warner; Frank, Martin
通讯作者	Blanchet, CL (corresponding author), GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Climate Dynam & Landscape Evolut, Potsdam, Germany.
来源期刊	NATURE GEOSCIENCE
ISSN	1752-0894
EISSN	1752-0908
出版年	2021
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. The presence of large rivers in North Africa critical for Quaternary human migrations were controlled by a combination of orbital forcing and Mediterranean storminess, according to terrestrial proxy records from a marine core off Libya integrated with paleoclimate modelling.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000612579200001
WOS关键词	COMPOSITIONAL DATA ; CARBON-DIOXIDE ; HOMO-SAPIENS ; CLIMATE ; INSOLATION ; ISOTOPE ; OCEAN ; MARINE ; LIBYA ; ND
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351199
作者单位	[Blanchet, Cecile L.; Tjallingii, Rik] GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Climate Dynam & Landscape Evolut, Potsdam, Germany; [Osborne, Anne H.; Brueckmann, Warner; Frank, Martin] GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany; [Tjallingii, Rik] Royal Netherlands Inst Sea Res NIOZ, Dept Ocean Syst, Thorntje, Texel, Netherlands; [Ehrmann, Werner] Univ Leipzig, Inst Geol & Geophys, Leipzig, Germany; [Friedrich, Tobias] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Dept Oceanog, Honolulu, HI 96822 USA; [Timmermann, Axel] Inst Basic Sci IBS, Ctr Climate Phys, Busan, South Korea; [Timmermann, Axel] Pusan Natl Univ, Busan, South Korea
推荐引用方式 GB/T 7714	Blanchet, Cecile L.,Osborne, Anne H.,Tjallingii, Rik,et al. Drivers of river reactivation in North Africa during the last glacial cycle[J],2021,14(2).
APA	Blanchet, Cecile L..,Osborne, Anne H..,Tjallingii, Rik.,Ehrmann, Werner.,Friedrich, Tobias.,...&Frank, Martin.(2021).Drivers of river reactivation in North Africa during the last glacial cycle.NATURE GEOSCIENCE,14(2).
MLA	Blanchet, Cecile L.,et al."Drivers of river reactivation in North Africa during the last glacial cycle".NATURE GEOSCIENCE 14.2(2021).