Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf
Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf
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DOI：
10.1029/2004gl020697
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发表时间：
2004-09
影响因子：
5.2
通讯作者：
E. Rignot;G. Casassa;P. Gogineni;W. Krabill;A. Rivera;R. Thomas
中科院分区：
文献类型：
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作者：
E. Rignot;G. Casassa;P. Gogineni;W. Krabill;A. Rivera;R. Thomas
ERS-1/2和Radarsat-1卫星收集的干涉合成孔径雷达数据显示，在2002年拉森B冰架崩溃后，南极半岛冰川明显加速。赫克托里亚、绿色和埃文斯冰川在2000年至2003年之间加速了8倍，并在2003年适度减速。Jorum和起重机冰川在2003年初加速了两倍，到2003年底加速了三倍。相比之下，更南边的弗拉斯克和莱帕德冰川并没有加速，因为它们仍然受到冰架的支撑。与流动加速相关的质量损失每年超过27立方公里，冰以每年数十米的速度变薄。我们将冰川的这种突然演变归因于支撑冰架的移动。冰川变化的幅度说明了冰架对冰盖质量平衡的重要性和对海平面变化的贡献。
Interferometric synthetic‐aperture radar data collected by ERS‐1/2 and Radarsat‐1 satellites show that Antarctic Peninsula glaciers sped up significantly following the collapse of Larsen B ice shelf in 2002. Hektoria, Green and Evans glaciers accelerated eightfold between 2000 and 2003 and decelerated moderately in 2003. Jorum and Crane glaciers accelerated twofold in early 2003 and threefold by the end of 2003. In contrast, Flask and Leppard glaciers, further south, did not accelerate as they are still buttressed by an ice shelf. The mass loss associated with the flow acceleration exceeds 27 km3 per year, and ice is thinning at rates of tens of meters per year. We attribute this abrupt evolution of the glaciers to the removal of the buttressing ice shelf. The magnitude of the glacier changes illustrates the importance of ice shelves on ice sheet mass balance and contribution to sea level change.