DOI: 10.5194/tc-9-1831-2015
Scopus记录号: 2-s2.0-84942108741
论文题名: Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet
作者: Noël B ; , Van De Berg W ; J ; , Van Meijgaard E ; , Kuipers Munneke P ; , Van De Wal R ; S ; W ; , Van Den Broeke M ; R
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 5 起始页码: 1831
结束页码: 1844
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75245
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: Institute for Marine and Atmospheric Research Utrecht, University of Utrecht, Utrecht, Netherlands; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Recommended Citation:
Noël B,, Van De Berg W,J,et al. Evaluation of the updated regional climate model RACMO2.3: Summer snowfall impact on the Greenland Ice Sheet[J]. Cryosphere,2015-01-01,9(5)