DOI: 10.1175/JCLI-D-17-0447.1
Scopus记录号: 2-s2.0-85041953085
论文题名: Greenland Ice Sheet surface melt and its relation to daily atmospheric conditions
作者: Cullather R.I. ; Nowicki S.M.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 5 起始页码: 1897
结束页码: 1919
语种: 英语
英文关键词: Arctic
; Blocking
; Clouds
; Ice sheets
; Reanalysis data
; Regression analysis
Scopus关键词: Budget control
; Clouds
; Glacial geology
; Glaciers
; Regression analysis
; Sea level
; Solar radiation
; Arctic
; Atmospheric circulation
; Atmospheric conditions
; Atmospheric reanalysis
; Blocking
; Ice sheet
; Reanalysis
; Spatial heterogeneity
; Ice
; atmospheric blocking
; atmospheric circulation
; cloud cover
; ice sheet
; mass balance
; radiative forcing
; regression analysis
; Arctic
; Arctic
; Denmark Strait
; Greenland
; Greenland Ice Sheet
英文摘要: Melt area is one of the most reliably monitored variables associated with surface conditions over the full Greenland Ice Sheet (GrIS). Surface melt is also an important indicator of surface mass balance and has potential relevance to the ice sheet's global sea level contribution. Melt events are known to be spatially heterogeneous and have varying time scales. To understand the forcing mechanisms, it is necessary to examine the relation between the existing conditions and melt area on the time scales that melt is observed. Here, the authors conduct a regression analysis of atmospheric reanalysis variables including sea level pressure, near-surface winds, and components of the surface energy budget with surface melt. The regression analysis finds spatial heterogeneity in the associated atmospheric circulation conditions. For basins in the southern GrIS, there is an association between melt area and high pressure located south of the Denmark Strait, which allows for southerly flow over the western half of the GrIS. Instantaneous surface melt over northern basins is also associated with low pressure over the central Arctic. Basins associated with persistent summer melt in the southern and western GrIS are associated with the presence of an enhanced cloud cover, a resulting decreased downwelling solar radiative flux, and an enhanced downwelling longwave radiative flux. This contrasts with basins to the north and east, where an increased downwelling solar radiative flux plays a more important role in the onset of a melt event. The analysis emphasizes the importance of daily variability in synoptic conditions and their preferred association with melt events. © 2018 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111632
Appears in Collections: 气候减缓与适应
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作者单位: Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, United States; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Cullather R.I.,Nowicki S.M.J.. Greenland Ice Sheet surface melt and its relation to daily atmospheric conditions[J]. Journal of Climate,2018-01-01,31(5)