Greenland flow variability from ice-sheet-wide velocity mapping
Greenland flow variability from ice-sheet-wide velocity mapping
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DOI：
10.3189/002214310792447734
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发表时间：
2010-01-01
影响因子：
3.4
通讯作者：
Moon, Twila
中科院分区：
文献类型：
--
作者：
Joughin, Ian;Smith, Ben E.;Moon, Twila
使用雷达卫星合成孔径雷达数据，我们已经映射了2000/01年和2005/06年冬季的格陵兰冰盖的流速。这些地图提供了冰盖流动的详细视图，包括数百条冰川排出内部的情况。在海岸的流动模式集中表明基岩地形的强烈影响。我们的两张地图之间的差异证实了许多早期观测到的加速出口冰川流动，以及揭示了以前未被认识到的变化。总的模式是加速伴随着终点后退，但也有几个激增行为的例子和一些冰川减速的例子。像这样定期进行的全面测绘为了解冰盖变化提供了重要的新的观测能力。
Using RADARSAT synthetic aperture radar data, we have mapped the flow velocity over much of the Greenland ice sheet for the winters of 2000/01 and 2005/06. These maps provide a detailed view of the ice-sheet flow, including that of the hundreds of glaciers draining the interior. The focused patterns of flow at the coast suggest a strong influence of bedrock topography. Differences between our two maps confirm numerous early observations of accelerated outlet glacier flow as well as revealing previously unrecognized changes. The overall pattern is one of speed-up accompanied by terminus retreat, but there are also several instances of surge behavior and a few cases of glacier slowdown. Comprehensive mappings such as these, at regular intervals, provide an important new observational capability for understanding ice-sheet variability.