Volume loss from Antarctic ice shelves is accelerating
Volume loss from Antarctic ice shelves is accelerating
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DOI：
10.1126/science.aaa0940
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发表时间：
2015-04-17
期刊：
影响因子：
56.9
通讯作者：
Padman, Laurie
中科院分区：
文献类型：
--
作者：
Paolo, Fernando S.;Fricker, Helen A.;Padman, Laurie
南极冰盖周围的浮冰架限制了南极冰盖的流动。冰架变薄会减少这种影响，导致向海洋排放的冰增加。利用18年的连续卫星雷达高度计观测，我们计算了南极大陆周围冰架厚度的十年尺度变化。总体而言，平均冰架体积变化从1994-2003年每年25 +/- 64立方公里的可忽略损失加速到2003-2012年每年310 +/- 74立方公里的快速损失。在过去的十年中，南极西部的损失增加了70%，而南极东部冰架的早期体积增加停止了。在阿蒙森和别林斯高晋地区，一些冰架在不到20年的时间里已经失去了18%的厚度。
The floating ice shelves surrounding the Antarctic Ice Sheet restrain the grounded ice-sheet flow. Thinning of an ice shelf reduces this effect, leading to an increase in ice discharge to the ocean. Using 18 years of continuous satellite radar altimeter observations, we have computed decadal-scale changes in ice-shelf thickness around the Antarctic continent. Overall, average ice-shelf volume change accelerated from negligible loss at 25 +/- 64 cubic kilometers per year for 1994-2003 to rapid loss of 310 +/- 74 cubic kilometers per year for 2003-2012. West Antarctic losses increased by similar to 70% in the past decade, and earlier volume gain by East Antarctic ice shelves ceased. In the Amundsen and Bellingshausen regions, some ice shelves have lost up to 18% of their thickness in less than two decades.