Melt Detection in Antarctic Ice Shelves Using Scatterometers and Microwave Radiometers
Melt Detection in Antarctic Ice Shelves Using Scatterometers and Microwave Radiometers
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DOI：
10.1109/tgrs.2006.874138
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发表时间：
2006-08
影响因子：
8.2
通讯作者：
L. Kunz;D. Long
中科院分区：
文献类型：
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作者：
L. Kunz;D. Long
利用SeaWinds-on-QuikSCAT散射仪的Ku波段双极化雷达后向散射测量值来确定南极冰架表面冻结和融化的时期。归一化水平极化雷达后向散射（sigmao）和后向散射极化比被用于冰状态的最大似然估计。该方法用于推断位于伦讷、罗斯、拉森、埃默里、沙克尔顿和其他冰架上的25个研究地点的每日冰面条件。雷达响应的时间和空间变化观察到的各种邻域大小周围的每个给定的位置在研究期间。标准确定的融化开始和冻结的日期为每个南方的夏天。冰状态和融化开始日期估计的验证进行分析，从特殊传感器微波/成像仪（SSM/I）辐射计相应的亮度温度（Tb）测量。QuikSCAT sigmao测量从1999年到2003年进行了分析，发现是有效的，在高的时间和空间分辨率在确定南极冰盖融化的时期。这些估计可用于研究南极冰盖季节性和年际融化的气候影响
Ku-band dual-polarization radar backscatter measurements from the SeaWinds-on-QuikSCAT scatterometer are used to determine periods of surface freeze and melt in the Antarctic ice shelves. The normalized horizontal-polarization radar backscatter (sigmao) and backscatter polarization ratio are used in maximum-likelihood estimation of the ice state. This method is used to infer the daily ice-surface conditions for 25 study locations located on the Ronne, Ross, Larsen, Amery, Shackleton, and other ice shelves. The temporal and spatial variations of the radar response are observed for various neighborhood sizes surrounding each given location during the study period. Criteria for determining the dates of melt onset and freeze-up for each Austral summer are presented. Validation of the ice-state and melt-onset date estimates is performed by analyzing the corresponding brightness temperature (Tb) measurements from Special Sensor Microwave/Imager (SSM/I) radiometers. QuikSCAT sigmao measurements from 1999 to 2003 are analyzed and found to be effective in determining periods of melt in Antarctic ice sheets at high temporal and spatial resolutions. These estimates can be used in studies of the climatic effects of the seasonal and interannual melting of the Antarctic ice sheets