DOI: 10.1175/JCLI-D-11-00044.1
Scopus记录号: 2-s2.0-84858257287
论文题名: True to milankovitch: Glacial inception in the new community climate system model
作者: Jochum M. ; Jahn A. ; Peacock S. ; Bailey D.A. ; Fasullo J.T. ; Kay J. ; Levis S. ; Bette B.-O.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 7 起始页码: 2226
结束页码: 2239
语种: 英语
Scopus关键词: Arctic clouds
; Atmospheric heat
; Atmospheric model
; Community climate system model
; Equilibrium solutions
; Fully-coupled
; Ice age
; Last glacial inception
; Meridional heat transports
; Milankovitch
; North Atlantic
; North Atlantic Currents
; Northern Canada
; Northwest Passage
; Ocean heat transport
; Orbital forcing
; SIBERIA
; Snow accumulation
; Spatial resolution
; Thermohaline circulations
; Clouds
; Feedback
; Glacial geology
; Heat transfer
; Sea ice
; Snow
; Climate models
; albedo
; atmospheric modeling
; climate modeling
; cloud
; computer simulation
; general circulation model
; heat budget
; orbital forcing
; Pleistocene
; snow accumulation
; spatial resolution
; thermohaline circulation
英文摘要: The equilibrium solution of a fully coupled general circulation model with present-day orbital forcing is compared to the solution of the same model with the orbital forcing from 115 000 years ago. The difference in snow accumulation between these two simulations has a pattern and a magnitude comparable to the ones inferred from reconstructions for the last glacial inception. This is a major improvement over previous similar studies, and the increased realism is attributed to the higher spatial resolution in the atmospheric model, which allows for a more accurate representation of the orography of northern Canada and Siberia. The analysis of the atmospheric heat budget reveals that, as postulated by Milankovitch's hypothesis, the only necessary positive feedback is the snow-albedo feedback, which is initiated by reduced melting of snow and sea ice in the summer. However, this positive feedback is almost fully compensated by an increased meridional heat transport in the atmosphere and a reduced concentration of low Arctic clouds. In contrast to similar previous studies, the ocean heat transport remains largely unchanged. This stability of the northern North Atlantic circulation is explained by the regulating effect of the freshwater import through the Nares Strait and Northwest Passage and the spiciness import by the North Atlantic Current. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52439
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Jochum M.,Jahn A.,Peacock S.,et al. True to milankovitch: Glacial inception in the new community climate system model[J]. Journal of Climate,2012-01-01,25(7)