DOI: 10.1007/s00382-012-1305-4
Scopus记录号: 2-s2.0-84867139659
论文题名: Multistability of the Greenland ice sheet and the effects of an adaptive mass balance formulation
作者: Solgaard A.M. ; Langen P.L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-07-08 起始页码: 1599
结束页码: 1612
语种: 英语
英文关键词: Atmosphere ice sheet interaction
; Ice sheet stability
; Mass balance formulation
英文摘要: The effect of a warmer climate on the Greenland ice sheet as well as its ability to regrow from a reduced geometry is important knowledge when studying future climate. Here we use output from a general circulation model to construct adaptive temperature and precipitation patterns to force an ice flow model off-line taking into consideration that the patterns change in a non-uniform way (both spatially and temporally) as the geometry of the ice sheet evolves and as climate changes. In a series of experiments we investigate the retreat from the present day configuration, build-up from ice free conditions of the ice sheet during a warmer-than-present climate and how the ice sheet moves between states. The adaptive temperature and accumulation patterns as well as two different constant-pattern formulations are applied and all experiments are run to steady state. All results fall into four different groups of geometry regardless of the applied accumulation pattern and initial state. We find that the ice sheet is able to survive and build up at higher temperatures using the more realistic adaptive patterns compared to the classic constant patterns. In contrast, decay occurs at considerably higher temperatures than build-up when the other formulations are used. When studying the motion between states it is clear that the initial state is crucial for the result. The ice sheet is thus multistable at least for certain temperature forcings, and this implies that the ice sheet not does not necessarily return to its initial configuration after a temperature excursion. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55148
Appears in Collections: 过去全球变化的重建
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作者单位: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
Recommended Citation:
Solgaard A.M.,Langen P.L.. Multistability of the Greenland ice sheet and the effects of an adaptive mass balance formulation[J]. Climate Dynamics,2012-01-01,39(2017-07-08)