DOI: 10.1175/JCLI-D-14-00075.1
Scopus记录号: 2-s2.0-84919625589
论文题名: Sea ice and dynamical controls on preindustrial and last glacial maximum accumulation in central Greenland
作者: Rhines A. ; Huybers P.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 23 起始页码: 8902
结束页码: 8917
语种: 英语
Scopus关键词: Glacial geology
; Isotopes
; Oceanography
; Sea ice
; Storms
; Atmospheric circulation
; Atmospheric simulations
; Greenland ice cores
; Last Glacial Maximum
; Long range transport
; Source distribution
; Surface boundary conditions
; Synoptic variability
; Moisture control
; accumulation rate
; amplitude
; boundary condition
; climate change
; climate variation
; ice core
; ice cover
; Last Glacial Maximum
; long range transport
; sea ice
; storm track
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland
英文摘要: Greenland has experienced large changes since the last glacial with its summit warming by approximately 21°C, average accumulation rates tripling, and annual amplitudes of temperature and accumulation seemingly declining. The altered seasonal cycle of accumulation has been attributed to a combination of the large-scale dynamical response of the North Atlantic storm track to surface boundary conditions and the modulation of moisture availability due to changes in winter sea ice cover. Using atmospheric simulations of preindustrial and glacial climate, the contributions of these two mechanisms are evaluated. Estimates of moisture source footprints make it possible to distinguish between long-range transport related to the storm track and regional transport from the ocean surface near Greenland. It is found that the contribution of both mechanisms varies significantly with the background climate. With greater ice cover and the North Atlantic storm track locked to the topographically enhanced stationary wave during the glacial, seasonal migration of the sea ice edge becomes relatively important in controlling moisture availability. In contrast, the preindustrial simulation has relatively greater transient eddy activity and is less moisture limited by sea ice extent, so accumulation is more strongly related to synoptic variability in the North Atlantic. These results highlight how changes in atmospheric circulation and sea ice together explain the shifts in annual mean and seasonal moisture supply to Greenland. Also discussed are some implications of the inferred narrow source distribution of accumulation during the glacial for the interpretation of stable isotopes derived from the central Greenland ice cores. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51313
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Rhines A.,Huybers P.J.. Sea ice and dynamical controls on preindustrial and last glacial maximum accumulation in central Greenland[J]. Journal of Climate,2014-01-01,27(23)