Surface meltstreams on the Amery Ice Shelf, East Antarctica
Surface meltstreams on the Amery Ice Shelf, East Antarctica
复制标题
南极洲东部阿默里冰架的表面融流
DOI：
10.3189/1998aog27-1-177-181
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发表时间：
1998
影响因子：
2.9
通讯作者：
H. Phillips
中科院分区：
文献类型：
--
作者：
H. Phillips
1995年春季用全球定位系统绘制的南极洲东部Amery冰架120公里乘20公里的地形图显示，冰架表面有两个长而浅的槽。在18个月前获得的合成孔径雷达图像中出现了与这些波谷相吻合的平滑特征。1993- 1994年夏季，ERS-1高度计波形序列和沿沿着重复的卫星地面轨迹对Amery冰架同一部分进行的反向散射测量表明，1994年1月30日至2月2日期间，在2公里的区域内发生了剧烈变化。这种变化与冰架表面液态水的存在是一致的，位于两个槽的较深处。一个时间序列的特殊传感器微波/成像仪亮度温度在兰伯特冰川-埃默里冰架地区的同一时期有尖锐的最大值1994年1月5日和1月21日。这些最大值被解释为融化事件，导致25天后在高度计数据中观察到的熔体流。
A topographic map of a 120 km by 20 km section of the Amery Ice Shelf, East Antarctica, mapped with the global positioning system (GPS) in the spring of 1995, revealed two long, shallow troughs in the ice-shelf surface. Smooth features coinciding with these troughs appeared in a synthetic aperture radar image acquired 18 months earlier. ERS-1 altimeter waveform sequences and backscatter measurements along repeat satellite ground tracks across the same section of the Amery Ice Shelf, for the 1993-94 summer, exhibited a dramatic change over a 2 km sector between 30 January and 2 February 1994. The change is consistent with the presence of liquid water on the ice-shelf surface, located in the deeper of the two troughs. A time series of special sensor microwave/ imager brightness temperatures over the Lambert Glacier-Amery Ice Shelf region for the same period has sharp maxima on 5 January and 21 January 1994. These maxima are interpreted as the melting events leading to the meltstream observed in the altimeter data 25 days later.