Ice flow in Greenland for the International Polar Year 2008-2009
Ice flow in Greenland for the International Polar Year 2008-2009
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DOI：
10.1029/2012gl051634
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发表时间：
2012-06-02
影响因子：
5.2
通讯作者：
Mouginot, J.
中科院分区：
文献类型：
--
作者：
Rignot, E.;Mouginot, J.
冰面速度的数字表示对于各种冰川学、地质学和地球物理学分析和建模至关重要。在这里，我们提出了一个新的，参考，全面，高分辨率，数字镶嵌冰运动在格陵兰岛组装从卫星雷达干涉测量数据在国际极地年2008年至2009年期间获得的环境卫星高级合成孔径雷达（ASAR），高级陆地观测系统（ALOS）的相控阵L波段合成孔径雷达（PALSAR）和雷达卫星-1合成孔径雷达，覆盖了99%的冰盖面积。由于L波段频率的时间相干性较高，使用ALOS PALSAR数据可获得最佳制图性能;但C波段频率SAR数据受电离层影响较小。冰运动图揭示了不同的流动状态，从模式化的增强流到格陵兰北部寒冷，低降水地区的几个大冰川;到扩散，增强流到格陵兰西北部和东南部温暖，高降水地区的众多，狭窄，快速移动的冰川。我们发现，100个最快的冰川（v > 800 m/yr）消耗了66%的冰盖面积，海洋终止冰川消耗了88%的格陵兰岛，基底滑动运动主导了超过50%的冰盖内部变形。冰盖运动的这一观点为冰流建模提供了重要的新约束。引用：Rignot，E.，和J. Mouginot（2012年），《2008-2009国际极地年格陵兰冰流》，地球物理学。保留信函：39，L11501，doi：10.1029/2012GL051634。
A digital representation of ice surface velocity is essential for a variety of glaciological, geologic and geophysical analyses and modeling. Here, we present a new, reference, comprehensive, high-resolution, digital mosaic of ice motion in Greenland assembled from satellite radar interferometry data acquired during the International Polar Year 2008 to 2009 by the Envisat Advanced Synthetic-Aperture Radar (ASAR), the Advanced Land Observation System (ALOS)'s Phase-Array L-band SAR (PALSAR) and the RADARSAT-1 SAR that covers 99% of the ice sheet in area. The best mapping performance is obtained using ALOS PALSAR data due to higher levels of temporal coherence at the L-band frequency; but C-band frequency SAR data are less affected by the ionosphere. The ice motion map reveals various flow regimes, ranging from patterned enhanced flow into a few large glaciers in the cold, low precipitation areas of north Greenland; to diffuse, enhanced flow into numerous, narrow, fast-moving glaciers in the warmer, high precipitation sectors of northwest and southeast Greenland. We find that the 100 fastest glaciers (v > 800 m/yr) drain 66% of the ice sheet in area, marine-terminating glaciers drain 88% of Greenland, and basal-sliding motion dominates internal deformation over more than 50% of the ice sheet. This view of ice sheet motion provides significant new constraints on ice flow modeling. Citation: Rignot, E., and J. Mouginot (2012), Ice flow in Greenland for the International Polar Year 2008-2009, Geophys. Res. Lett., 39, L11501, doi:10.1029/2012GL051634.