The role of atmospheric rivers in anomalous snow accumulation in East Antarctica
The role of atmospheric rivers in anomalous snow accumulation in East Antarctica
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DOI：
10.1002/2014gl060881
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发表时间：
2014-09-16
影响因子：
5.2
通讯作者：
Van Lipzig, Nicole P. M.
中科院分区：
文献类型：
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作者：
Gorodetskaya, Irina V.;Tsukernik, Maria;Van Lipzig, Nicole P. M.
近年来，东南极洲德龙宁毛德地（DML）的大雪堆积事件对南极冰盖表面物质平衡（SMB）有重要贡献。在这里，我们结合联合收割机在原位积累测量和雷达推导的降雪率从伊丽莎白公主站（PE），位于DML悬崖区，沿着与欧洲中心中期天气预报中期再分析，调查负责这些事件的水分输送模式。特别是，2009年5月和2011年2月的两次高累积事件显示了大气河流特征，其综合水汽增强，集中在从亚热带纬度延伸到南极东海岸的狭长地带。适应基于IWV的AR阈值标准为南极洲（占更冷，更干燥的环境），我们发现，这是四个和五个AR达到沿海DML的贡献74-80%的优秀SMB在2009年和2011年在PE。因此，核算AR对于了解东南极SMB至关重要。
Recent, heavy snow accumulation events over Dronning Maud Land (DML), East Antarctica, contributed significantly to the Antarctic ice sheet surface mass balance (SMB). Here we combine in situ accumulation measurements and radar-derived snowfall rates from Princess Elisabeth station (PE), located in the DML escarpment zone, along with the European Centre for Medium-range Weather Forecasts Interim reanalysis to investigate moisture transport patterns responsible for these events. In particular, two high-accumulation events in May 2009 and February 2011 showed an atmospheric river (AR) signature with enhanced integrated water vapor (IWV), concentrated in narrow long bands stretching from subtropical latitudes to the East Antarctic coast. Adapting IWV-based AR threshold criteria for Antarctica (by accounting for the much colder and drier environment), we find that it was four and five ARs reaching the coastal DML that contributed 74-80% of the outstanding SMB during 2009 and 2011 at PE. Therefore, accounting for ARs is crucial for understanding East Antarctic SMB.