气候变化领域集成服务门户(CCPortal): Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet

CCPortal

DOI	10.5194/tc-9-1831-2015
	Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet
	Noël B.; Van De Berg W.J.; Van Meijgaard E.; Kuipers Munneke P.; Van De Wal R.S.W.; Van Den Broeke M.R.
发表日期	2015
ISSN	19940416
卷号	9 期号:5
英文摘要	We discuss Greenland Ice Sheet (GrIS) surface mass balance (SMB) differences between the updated polar version of the RACMO climate model (RACMO2.3) and the previous version (RACMO2.1). Among other revisions, the updated model includes an adjusted rainfall-to-snowfall conversion that produces exclusively snowfall under freezing conditions; this especially favours snowfall in summer. Summer snowfall in the ablation zone of the GrIS has a pronounced effect on melt rates, affecting modelled GrIS SMB in two ways. By covering relatively dark ice with highly reflective fresh snow, these summer snowfalls have the potential to locally reduce melt rates in the ablation zone of the GrIS through the snow-albedo-melt feedback. At larger scales, SMB changes are driven by differences in orographic precipitation following a shift in large-scale circulation, in combination with enhanced moisture to precipitation conversion for warm to moderately cold conditions. A detailed comparison of model output with observations from automatic weather stations, ice cores and ablation stakes shows that the model update generally improves the simulated SMB-elevation gradient as well as the representation of the surface energy balance, although significant biases remain. © Author(s) 2015.
学科领域	ablation; climate effect; climate modeling; energy balance; freezing; ice core; orographic effect; precipitation assessment; regional climate; snowmelt; summer; surface energy; warming; weather station; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	ablation; climate effect; climate modeling; energy balance; freezing; ice core; orographic effect; precipitation assessment; regional climate; snowmelt; summer; surface energy; warming; weather station; 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/119814
作者单位	Institute for Marine and Atmospheric Research Utrecht, University of Utrecht, Utrecht, Netherlands; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
推荐引用方式 GB/T 7714	Noël B.,Van De Berg W.J.,Van Meijgaard E.,et al. Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet[J],2015,9(5).
APA	Noël B.,Van De Berg W.J.,Van Meijgaard E.,Kuipers Munneke P.,Van De Wal R.S.W.,&Van Den Broeke M.R..(2015).Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet.Cryosphere,9(5).
MLA	Noël B.,et al."Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet".Cryosphere 9.5(2015).