Elevation changes and dynamic provinces of Jakobshavn Isbræ, Greenland, derived using generalized spatial surface roughness from ICESat GLAS and ATM data
Elevation changes and dynamic provinces of Jakobshavn Isbræ, Greenland, derived using generalized spatial surface roughness from ICESat GLAS and ATM data
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使用 ICESat GLAS 和 ATM 数据的广义空间表面粗糙度得出格陵兰岛雅各布港伊斯布拉的海拔变化和动态省份
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发表时间：
2014
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通讯作者：
A. Weltman
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作者：
U. Herzfeld;Brian W. McDonald;B. Wallin;W. Krabill;S. Manizade;John Sonntag;H. Mayer;W. A. Yearsley;Phillip A. Chen;A. Weltman
.我们的目标是绘制动态省份，并调查格陵兰岛雅各布港的动态变化。我们使用的方法，结合结构冰川学和遥感数据分析，促进广义空间表面粗糙度的数学表征，提供有关冰的动态，变形和相互作用的冰与床地形参数。该方法适用于推导出的高程和粗糙度变化的时间序列，并在快速撤退属性的变化。不同的动态类型的快速和缓慢移动的冰可以映射从ICESat地球科学激光高度计系统数据（2003-09）和机载地形测绘数据，使用空间粗糙度表征，验证ASTER和床地形数据。对比分析雅格布港南冰流高程变化和糙率变化的结果表明：（1）2004 - 2009年，雅格布港南冰流地表下降10-15 m a（cid：2）1，地表糙率和动力类型没有变化。这些研究结果是一致的前面撤退的一部分，峡湾冰川周期或以下变暖的峡湾水和气候变暖，但不与内部动态加速作为一个原因，在快速撤退期间观察到的变化。讨论了基底水压力变化的关系。所有的冰川动力学变化似乎都是在冰川前部附近开始的，并向冰川上方传播。
. Our objective is to map dynamic provinces and investigate dynamic changes in Jakobshavn Isbræ, Greenland. We use an approach that combines structural glaciology and remote-sensing data analysis, facilitated by mathematical characterization of generalized spatial surface roughness that provides parameters related to ice dynamics, deformation and interaction of the ice with bed topography. The approach is applied to derive time series of elevation and roughness changes and to attribute changes during rapid retreat. Different dynamic types of fast- and slow-moving ice can be mapped from ICESat Geoscience Laser Altimeter System data (2003–09) and Airborne Topographic Mapper data, using spatial roughness characterization, validated with ASTER and bed-topographic data. Results of comparative analysis of elevation changes and roughness changes of Jakobshavn south ice stream indicate (1) surface lowering of 10–15 m a (cid:2) 1 between 2004 and 2009 and (2) no change in surface roughness and dynamic types. These findings are consistent with a front retreat as part of a fjord-glacier cycle or following warming of fjord water and with climatic warming, but not with an internal dynamic acceleration as a cause of the observed changes during rapid retreat. Relationships to changes in basal water pressure are discussed. All glaciodynamic changes appear to have initiated near the front and propagated up-glacier.