Low‐frequency radar sounding of temperate ice masses in Southern Alaska
Low‐frequency radar sounding of temperate ice masses in Southern Alaska
复制标题
阿拉斯加南部温带冰块的低频雷达探测
DOI：
10.1002/2013gl057452
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
D. Kirchner
中科院分区：
文献类型：
--
作者：
E. Rignot;J. Mouginot;C. Larsen;Y. Gim;D. Kirchner
我们介绍温冰探测探测器（WISE），这是一种用于探测温带冰的低频（2.5兆赫）雷达。2008年和2012年在阿拉斯加南部部署的WISE对冰川厚度进行了全面测量，揭示了冰川下的深谷以及海平面以下接地区域的全部范围。哥伦比亚冰川的东支比其主支更深，并且在向内陆延伸20公里处仍低于海平面。塔兹利纳冰川的冰厚达1000米。在白令冰川上，两个岩床门槛将三个深的床面洼地（>1200米）分隔开来，这些洼地与冰川涌动期间的动平衡线相吻合。马拉斯皮纳冰川的山麓叶和哈伯德冰川的下游分别在距其末端40公里和10公里处完全位于海平面以下。了解这些地区的冰厚有助于更好地理解其冰川动力学、质量平衡以及对海平面的影响。
We present the Warm Ice Sounding Explorer (WISE), a low‐frequency (2.5 MHz) radar for the sounding of temperate ice. WISE deployment in southern Alaska in 2008 and 2012 provides comprehensive measurements of glacier thickness, reveals deep valleys beneath glaciers and the full extent of zones grounded below sea level. The east branch of Columbia Glacier is deeper that its main branch and remains below sea level 20 km farther inland. Ice is 1000 m deep on Tazlina Glacier. On Bering glacier, two sills separate three deep bed depressions (>1200 m) that coincide with the dynamic balance lines during surges. The piedmont lobe of Malaspina Glacier and the lower reaches of Hubbard Glacier are entirely grounded below sea level 40 and 10 km, respectively, from their termini. Knowledge of ice thickness in these regions helps better understand their glacier dynamics, mass balance, and impact on sea level.