DOI: 10.5194/cp-10-1453-2014
Scopus记录号: 2-s2.0-84940274191
论文题名: Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle
作者: Löfverström M. ; Caballero R. ; Nilsson J. ; Kleman J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 4 起始页码: 1453
结束页码: 1471
语种: 英语
Scopus关键词: atmospheric circulation
; atmospheric modeling
; concentration (composition)
; greenhouse gas
; ice sheet
; interglacial
; jet
; Last Glacial Maximum
; marine isotope stage
; Canada
; Laurentian Mountains
; Quebec [Canada]
英文摘要: We present modelling results of the atmospheric circulation at the cold periods of marine isotope stage 5b (MIS 5b), MIS 4 and the Last Glacial Maximum (LGM), as well as the interglacial. The palaeosimulations are forced by ice-sheet reconstructions consistent with geological evidence and by appropriate insolation and greenhouse gas concentrations. The results suggest that the large-scale atmospheric winter circulation remained largely similar to the interglacial for a significant part of the glacial cycle. The proposed explanation is that the ice sheets were located in areas where their interaction with the mean flow is limited. However, the LGM Laurentide Ice Sheet induces a much larger planetary wave that leads to a zonalisation of the Atlantic jet. In summer, the ice-sheet topography dynamically induces warm temperatures in Alaska and central Asia that inhibits the expansion of the ice sheets into these regions. The warm temperatures may also serve as an explanation for westward propagation of the Eurasian Ice Sheet from MIS 4 to the LGM. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49238
Appears in Collections: 气候变化与战略
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Recommended Citation:
Löfverström M.,Caballero R.,Nilsson J.,et al. Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle[J]. Climate of the Past,2014-01-01,10(4)