Ice-stream-related patterns of ice flow in the interior of northeast Greenland
Ice-stream-related patterns of ice flow in the interior of northeast Greenland
复制标题
格陵兰岛东北部内陆与冰流相关的冰流模式
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Gogineni
中科院分区：
文献类型：
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作者：
M. Fahnestock;I. Joughin;T. Scambos;R. Kwok;W. Krabill;S. Gogineni
格陵兰冰盖东北象限内部的冰流集中在排出山顶圆顶北侧的大冰流上。河流中的快速冰流在河流和边缘的表面特征中是明显的，在驱动冰流的大尺度地形中，以及在卫星获得的冰运动信息中。冰流的上半部的模式是显着的组织水平，简单的几何形状，并对当地的表面地形的影响。这条河流开始于距离冰分水岭不到100公里的地方，宽度为15公里，然后通过从两侧增加冰而对称地向下游扩大，宽度超过60公里。高程数据和可见光波段图像显示，该河流在上游有几十米深的边缘槽，与高剪切应变率区域相一致。河流的边缘和起伏表面的地形是由冰流产生的;在1994年至1999年的5年期间，河流中的表面起伏在位置和形状上是固定的。增强的流动对试图了解冰盖内部重要区域冰排放历史的研究人员提出了挑战。
Ice flow in the interior of the NE quadrant of the Greenland ice sheet is focused on the large ice stream draining the north side of the summit dome. The rapid ice flow in the stream is apparent in the surface features in the stream and at the margins, in the broad scale topography that drives ice flow, and in satellite-derived ice motion information. The patterns of ice flow in the upper half of the stream are remarkable for their level of organization, simple geometry, and effects on local surface topography. The stream begins less than 100 km from the ice divide as a current 15 km wide and then broadens symmetrically downstream by the addition of ice from the sides to a width of more than 60 km. Elevation data and visible-band imagery show that the stream has marginal troughs tens of meters deep in its upper reach which are coincident with regions of high shear strain rate. The topography of the margins and undulating surface of the stream is generated by the ice flow; the surface undulations in the stream are fixed in location and shape over the 5 year period from 1994 to 1999. The enhanced flow presents a challenge for researchers trying to understand the history of ice discharge from a significant area in the interior of the ice sheet.