DOI: 10.5194/cp-8-935-2012
Scopus记录号: 2-s2.0-84861624836
论文题名: The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region
作者: Hofer D. ; Raible C.C. ; Dehnert A. ; Kuhlemann J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 3 起始页码: 935
结束页码: 949
语种: 英语
Scopus关键词: atmospheric dynamics
; general circulation model
; glacier
; jet stream
; Last Glacial Maximum
; Laurentide Ice Sheet
; paleoclimate
; precipitation (climatology)
; radiative forcing
; sea ice
; sea surface temperature
; topographic effect
; Weichselian
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Using a highly resolved atmospheric general circulation model, the impact of different glacial boundary conditions on precipitation and atmospheric dynamics in the North Atlantic region is investigated. Six 30-yr time slice experiments of the Last Glacial Maximum at 21 thousand years before the present (ka BP) and of a less pronounced glacial state - the Middle Weichselian (65 ka BP) - are compared to analyse the sensitivity to changes in the ice sheet distribution, in the radiative forcing and in the prescribed time-varying sea surface temperature and sea ice, which are taken from a lower-resolved, but fully coupled atmosphere-ocean general circulation model. The strongest differences are found for simulations with different heights of the Laurentide ice sheet. A high surface elevation of the Laurentide ice sheet leads to a southward displacement of the jet stream and the storm track in the North Atlantic region. These changes in the atmospheric dynamics generate a band of increased precipitation in the mid-latitudes across the Atlantic to southern Europe in winter, while the precipitation pattern in summer is only marginally affected. The impact of the radiative forcing differences between the two glacial periods and of the prescribed time-varying sea surface temperatures and sea ice are of second order importance compared to the one of the Laurentide ice sheet. They affect the atmospheric dynamics and precipitation in a similar but less pronounced manner compared with the topographic changes. © 2012 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49579
Appears in Collections: 气候变化与战略
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Recommended Citation:
Hofer D.,Raible C.C.,Dehnert A.,et al. The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region[J]. Climate of the Past,2012-01-01,8(3)