DOI: 10.5194/tc-7-1-2013
Scopus记录号: 2-s2.0-84873634308
论文题名: Future projections of the Greenland ice sheet energy balance driving the surface melt
作者: Franco B ; , Fettweis X ; , Erpicum M
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 1
结束页码: 18
语种: 英语
英文关键词: air temperature
; albedo
; climate conditions
; climate modeling
; cloud cover
; energy balance
; general circulation model
; ice sheet
; longwave radiation
; regional climate
; snowmelt
; solar radiation
; surface energy
; temperature anomaly
; twentieth century
; twenty first century
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: In this study, simulations at 25 km resolution are performed over the Greenland ice sheet (GrIS) throughout the 20th and 21st centuries, using the regional climate model MAR forced by four RCP scenarios from three CMIP5 global circulation models (GCMs), in order to investigate the projected changes of the surface energy balance (SEB) components driving the surface melt. Analysis of 2000-2100 melt anomalies compared to melt results over 1980-1999 reveals an exponential relationship of the GrIS surface melt rate simulated by MAR to the near-surface air temperature (TAS) anomalies, mainly due to the surface albedo positive feedback associated with the extension of bare ice areas in summer. On the GrIS margins, the future melt anomalies are preferentially driven by stronger sensible heat fluxes, induced by enhanced warm air advection over the ice sheet. Over the central dry snow zone, the surface albedo positive feedback induced by the increase in summer melt exceeds the negative feedback of heavier snowfall for TAS anomalies higher than 4 C. In addition to the incoming longwave flux increase associated with the atmosphere warming, GCM-forced MAR simulations project an increase of the cloud cover decreasing the ratio of the incoming shortwave versus longwave radiation and dampening the albedo feedback. However, it should be noted that this trend in the cloud cover is contrary to that simulated by ERA-Interim-forced MAR for recent climate conditions, where the observed melt increase since the 1990s seems mainly to be a consequence of more anticyclonic atmospheric conditions. Finally, no significant change is projected in the length of the melt season, which highlights the importance of solar radiation absorbed by the ice sheet surface in the melt SEB. © Author(s) 2013. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75001
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Département de Géographie, Université de Liège, Liege, Belgium
Recommended Citation:
Franco B,, Fettweis X,, Erpicum M. Future projections of the Greenland ice sheet energy balance driving the surface melt[J]. Cryosphere,2013-01-01,7(1)