Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1017/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
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ISSN | 0033-5894 |
EISSN | 1096-0287 |
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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