Arid
DOI10.1017/qua.2018.46
Megalakes in the Sahara? A Review
Quade, Jay1; Dente, Elad2,3; Armon, Moshe2; Ben Dor, Yoav2; Morin, Efrat2; Adam, Ori2; Enzel, Yehouda2
通讯作者Quade, Jay
来源期刊QUATERNARY RESEARCH
ISSN0033-5894
EISSN1096-0287
出版年2018
卷号90期号:2页码:253-275
英文摘要

The Sahara was wetter and greener during multiple interglacial periods of the Quaternary, when some have suggested it featured very large (mega) lakes, ranging in surface area from 30,000 to 350,000 km(2). In this paper, we review the physical and biological evidence for these large lakes, especially during the African Humid Period (AHP) 11-5 ka. Megalake systems from around the world provide a checklist of diagnostic features, such as multiple well-defined shore-line benches, wave-rounded beach gravels where coarse material is present, landscape smoothing by lacustrine sediment, large-scale deltaic deposits, and in places, tufas encrusting shorelines. Our survey reveals no clear evidence of these features in the Sahara, except in the Chad basin. Hydrologic modeling of the proposed megalakes requires mean annual rainfall >= 1.2 m/yr and a northward displacement of tropical rainfall belts by >= 1000 km. Such a profound displacement is not supported by other paleo-climate proxies and comprehensive climate models, challenging the existence of megalakes in the Sahara. Rather than megalakes, isolated wetlands and small lakes are more consistent with the Sahelo-Sudanian paleoenvironment that prevailed in the Sahara during the AHP. A pale-green and discontinuously wet Sahara is the like-lier context for human migrations out of Africa during the late Quaternary.


英文关键词Sahara megalakes paleolakes paleowetlands Lake Chad Lake Victoria paleohydrology
类型Review
语种英语
国家USA ; Israel
收录类别SCI-E
WOS记录号WOS:000447003200001
WOS关键词REASSESSING LACUSTRINE ENVIRONMENTS ; HOLOCENE CLIMATIC RECORDS ; CENTRAL ATACAMA DESERT ; SOUTHERN GREAT-BASIN ; WATER-BALANCE MODEL ; LAKE MEGA-CHAD ; EASTERN SAHARA ; TIBETAN PLATEAU ; AFRICAN MONSOON ; MIDDLE HOLOCENE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构University of Arizona ; Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212495
作者单位1.Univ Arizona, Dept Geosci, 1040 East Fourth St, Tucson, AZ 85721 USA;
2.Hebrew Univ Jerusalem, Fredy & Nadine Herrmann Inst Earth Sci, Edmond J Safra Campus, IL-91904 Jerusalem, Israel;
3.Geol Survey Israel, IL-95501 Jerusalem, Israel
推荐引用方式
GB/T 7714
Quade, Jay,Dente, Elad,Armon, Moshe,et al. Megalakes in the Sahara? A Review[J]. University of Arizona, Hebrew University of Jerusalem,2018,90(2):253-275.
APA Quade, Jay.,Dente, Elad.,Armon, Moshe.,Ben Dor, Yoav.,Morin, Efrat.,...&Enzel, Yehouda.(2018).Megalakes in the Sahara? A Review.QUATERNARY RESEARCH,90(2),253-275.
MLA Quade, Jay,et al."Megalakes in the Sahara? A Review".QUATERNARY RESEARCH 90.2(2018):253-275.
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