气候变化领域集成服务门户(CCPortal): Future projections of the Greenland ice sheet energy balance driving the surface melt

CCPortal

DOI	10.5194/tc-7-1-2013
	Future projections of the Greenland ice sheet energy balance driving the surface melt
	Franco B.; Fettweis X.; Erpicum M.
发表日期	2013
ISSN	19940416
卷号	7 期号:1
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.
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120314
作者单位	Département de Géographie, Université de Liège, Liege, Belgium
推荐引用方式 GB/T 7714	Franco B.,Fettweis X.,Erpicum M.. Future projections of the Greenland ice sheet energy balance driving the surface melt[J],2013,7(1).
APA	Franco B.,Fettweis X.,&Erpicum M..(2013).Future projections of the Greenland ice sheet energy balance driving the surface melt.Cryosphere,7(1).
MLA	Franco B.,et al."Future projections of the Greenland ice sheet energy balance driving the surface melt".Cryosphere 7.1(2013).