DOI: 10.5194/cp-11-979-2015
Scopus记录号: 2-s2.0-84937035355
论文题名: A GCM comparison of Pleistocene super-interglacial periods in relation to Lake El'gygytgyn, NE Arctic Russia
作者: Coletti A.J. ; DeConto R.M. ; Brigham-Grette J. ; Melles M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 7 起始页码: 979
结束页码: 989
语种: 英语
Scopus关键词: boreal forest
; climate forcing
; climate modeling
; greenhouse gas
; heat transfer
; lake ecosystem
; land surface
; marine isotope stage
; paleoclimate
; paleoenvironment
; Pleistocene
; proxy climate record
; Arctic Ocean
; Chukchi
; Elgygytgyn Lake
; Russian Federation
; Russian Federation
英文摘要: Until now, the lack of time-continuous, terrestrial paleoenvironmental data from the Pleistocene Arctic has made model simulations of past interglacials difficult to assess. Here, we compare climate simulations of four warm interglacials at Marine Isotope Stages (MISs) 1 (9 ka), 5e (127 ka), 11c (409 ka) and 31 (1072 ka) with new proxy climate data recovered from Lake El'gygytgyn, NE Russia. Climate reconstructions of the mean temperature of the warmest month (MTWM) indicate conditions up to 0.4, 2.1, 0.5 and 3.1 °C warmer than today during MIS 1, 5e, 11c and 31, respectively. While the climate model captures much of the observed warming during each interglacial, largely in response to boreal summer (JJA) orbital forcing, the extraordinary warmth of MIS 11c compared to the other interglacials in the Lake El'gygytgyn temperature proxy reconstructions remains difficult to explain. To deconvolve the contribution of multiple influences on interglacial warming at Lake El'gygytgyn, we isolated the influence of vegetation, sea ice and circum-Arctic land ice feedbacks on the modeled climate of the Beringian interior. Simulations accounting for climate-vegetation-land-surface feedbacks during all four interglacials show expanding boreal forest cover with increasing summer insolation intensity. A deglaciated Greenland is shown to have a minimal effect on northeast Asian temperature during the warmth of stages 11c and 31 (Melles et al., 2012). A prescribed enhancement of oceanic heat transport into the Arctic Ocean does have some effect on Lake El'gygytgyn's regional climate, but the exceptional warmth of MIS l1c remains enigmatic compared to the modest orbital and greenhouse gas forcing during that interglacial. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49130
Appears in Collections: 气候变化与战略
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Recommended Citation:
Coletti A.J.,DeConto R.M.,Brigham-Grette J.,et al. A GCM comparison of Pleistocene super-interglacial periods in relation to Lake El'gygytgyn, NE Arctic Russia[J]. Climate of the Past,2015-01-01,11(7)