DOI: 10.1016/j.quascirev.2013.02.015
Scopus记录号: 2-s2.0-84872304952
论文题名: Impacts of abrupt climate changes in the Levant from Last Glacial Dead Sea levels
作者: Torfstein A. ; Goldstein S.L. ; Stein M. ; Enzel Y.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 69 起始页码: 1
结束页码: 7
语种: 英语
英文关键词: Dead Sea
; Lake levels
; Lake Lisan
; Levant paleoclimate
; Millennial scale climate change
Scopus关键词: Abrupt climate change
; Dead sea
; Eastern Mediterranean
; Hydrological condition
; Lake level fluctuations
; Lake levels
; Paleoclimates
; Temperature variation
; Climate change
; Drops
; Glacial geology
; Isotopes
; Moisture
; Sea level
; Lakes
; climate effect
; climate variation
; cyclogenesis
; Last Glacial
; paleoclimate
; temperature gradient
; Arctic
; Dead Sea
; Greenland
; Levant
; Mediterranean Region
英文摘要: A new, detailed lake level curve for Lake Lisan (the Last Glacial Dead Sea) reveals a high frequency of abrupt fluctuations during Marine Isotope Stage 3 (MIS3) compared to the relatively high stand characterizing MIS2, and the significantly lower Holocene lake. The lake level fluctuations reflect the hydrological conditions in the large watershed of the lake, which in turn reflects the hydro-climatic conditions in the central Levant region. The new curve shows that the fluctuations coincide on millennial timescales with temperature variations recorded in Greenland. Four patterns of correlation are observed through the last ice age: (1) maximum lake elevations were reached during MIS2, the coldest interval; (2) abrupt lake level drops to the lowest elevations coincided with the occurrence of Heinrich (H) events; (3) the lake returned to higher-stand conditions along with warming in Greenland that followed H-events; (4) significant lake level fluctuations coincided with virtually every Greenland stadial-interstadial cycle.Over glacial-interglacial time-scales, Northern Hemisphere glacial cooling induces extreme wetness in the Levant, with high lake levels reaching ∼160 m below mean sea level (mbmsl), approximately 240 m above typical Holocene levels of ∼400 mbmsl. These orbital time-scale shifts are driven by expansions of the European ice sheet, which deflect westerly storm tracks southward to the Eastern Mediterranean, resulting in increased sea-air temperature gradients that invoke increased cyclogenesis, and enhanced moisture delivery to the Levant. The millennial-scale lake level drops associated with Greenland stadials are most extreme during Heinrich stadials and reflect abrupt cooling of the Eastern Mediterranean atmosphere and sea-surface, which weaken the cyclogenic rain engine and cause extreme Levant droughts. During the recovery from the effect of Heinrich stadials, the regional climate configuration resumed typical glacial conditions, with enhanced Levant precipitation and a rise in Lake Lisan levels. Similar cyclicity in the transfer of moisture to the Levant affected lake levels during all of the non-Heinrich stadial-interstadial cycles. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60647
Appears in Collections: 过去全球变化的重建
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, 61 Rt. 9W, Palisades, NY 10964, United States; Department of Earth and Environmental Sciences, Columbia University, 61 Rt. 9W, Palisades, NY 10964, United States; Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel; The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Recommended Citation:
Torfstein A.,Goldstein S.L.,Stein M.,et al. Impacts of abrupt climate changes in the Levant from Last Glacial Dead Sea levels[J]. Quaternary Science Reviews,2013-01-01,69