气候变化领域集成服务门户(CCPortal): Enhanced mediterranean water cycle explains increased humidity during mis 3 in north Africa

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DOI	10.5194/cp-15-1757-2019
	Enhanced mediterranean water cycle explains increased humidity during mis 3 in north Africa
	Rogerson M.; Dublyansky Y.; Hoffmann D.; Luetscher M.; Töchterle P.; Spötl C.
发表日期	2019
ISSN	18149324
起始页码	1757
结束页码	1769
卷号	15 期号:5
英文摘要	We report a new fluid inclusion dataset from northeastern Libyan speleothem SC-06-01, which is the largest speleothem fluid inclusion dataset for North Africa to date. The stalagmite was sampled in Susah Cave, a low-altitude coastal site, in Cyrenaica, on the northern slope of the Jebel Al-Akhdar. Speleothem fluid inclusions from the latest Marine Isotope Stage (MIS) 4 and throughout MIS 3 (ĝ1/467 to ĝ1/430 kyr BP) confirm the hypothesis that past humid periods in this region reflect westerly rainfall advected through the Atlantic storm track. However, most of this moisture was sourced from the western Mediterranean, with little direct admixture of water evaporated from the Atlantic. Moreover, we identify a second moisture source likely associated with enhanced convective rainfall within the eastern Mediterranean. The relative importance of the western and eastern moisture sources seems to differ between the humid phases recorded in SC-06-01. During humid phases forced by precession, fluid inclusions record compositions consistent with both sources, but the 52.5-50.5 kyr interval forced by obliquity reveals only a western source. This is a key result, showing that although the amount of atmospheric moisture advections changes, the structure of the atmospheric circulation over the Mediterranean does not fundamentally change during orbital cycles. Consequently, an arid belt must have been retained between the Intertropical Convergence Zone and the midlatitude winter storm corridor during MIS 3 pluvials. © Author(s) 2019. This work is distributed under.
语种	英语
scopus关键词	atmospheric circulation; atmospheric moisture; fluid inclusion; humidity; hydrological cycle; intertropical convergence zone; marine isotope stage; precipitation (climatology); speleothem; stalagmite; storm track; westerly; Atlantic Ocean; Cyrenaica; Libyan Arab Jamahiriya; Mediterranean Sea; Sousse; Tunisia
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146776
作者单位	School of Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom; Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, 04103, Germany; Swiss Institute for Speleology and Karst Studies (ISSKA), Rue de la Serre 68, La Chaux-de-Fonds, 2300, Switzerland
推荐引用方式 GB/T 7714	Rogerson M.,Dublyansky Y.,Hoffmann D.,et al. Enhanced mediterranean water cycle explains increased humidity during mis 3 in north Africa[J],2019,15(5).
APA	Rogerson M.,Dublyansky Y.,Hoffmann D.,Luetscher M.,Töchterle P.,&Spötl C..(2019).Enhanced mediterranean water cycle explains increased humidity during mis 3 in north Africa.Climate of the Past,15(5).
MLA	Rogerson M.,et al."Enhanced mediterranean water cycle explains increased humidity during mis 3 in north Africa".Climate of the Past 15.5(2019).