DOI: 10.1007/s00382-011-1196-9
Scopus记录号: 2-s2.0-84866391963
论文题名: Onset and end of the summer melt season over sea ice: Thermal structure and surface energy perspective from SHEBA
作者: Persson P.O.G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 6 起始页码: 1349
结束页码: 1371
语种: 英语
英文关键词: Arctic melt-season transitions
; Arctic synoptic events
; Atmosphere-sea ice interactions
; SHEBA data
; Surface energy budget
英文摘要: Various measurements from the Surface Heat Flux of the Arctic Ocean (SHEBA) experiment have been combined to study structures and processes producing the onset and end of summer melt over Arctic sea ice. The analysis links the surface energy budget to free-troposphere synoptic variables, clouds, precipitation, and in-ice temperatures. The key results are (1) SHEBA melt-season transitions are associated with atmospheric synoptic events (2) onset of melt clearly occurs on May 28, while the end of melt is produced by a sequence of three atmospheric storm events over a 28-day period producing step-like reductions in the net surface energy flux. The last one occurs on August 22.; (3) melt onset is primarily due to large increases in the downwelling longwave radiation and modest decreases in the surface albedo; (4) decreases in the downwelling longwave radiation occur for all end-of-melt transition steps, while increases in surface albedo occur for the first two; (5) decreases in downwelling shortwave radiation contribute only to the first end-of-melt transition step; (6) springtime free-tropospheric warming preconditions the atmosphere-ice system for the subsequent melt onset; and (7) melt-season transitions also mark transitions in system responses to radiative energy flux changes because of invariant melt-season surface temperatures. The extensive SHEBA observations enable an understanding of the complex processes not available from other field program data. The analysis provides a basis for future testing of the generality of the results, and contributes to better physical understanding of multi-year analyses of melt-season trends from less extensive data sets. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55192
Appears in Collections: 过去全球变化的重建
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作者单位: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States; Physical Sciences Division (NOAA/ESRL/PSD), National Oceanic and Atmospheric Administration/Earth Systems Research Laboratory, Boulder, CO 80305, United States
Recommended Citation:
Persson P.O.G.. Onset and end of the summer melt season over sea ice: Thermal structure and surface energy perspective from SHEBA[J]. Climate Dynamics,2012-01-01,39(6)