Substantial thinning of a major east Greenland outlet glacier

Substantial thinning of a major east Greenland outlet glacier
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格陵兰东部主要出口冰川大幅变薄

DOI:
10.1029/1999gl008473
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发表时间:
2000
影响因子:
5.2
通讯作者:
E. Rignot
E. Rignot
中科院分区:
地球科学1区
文献类型:
--
作者:
R. Thomas;W. Abdalati;T. Akins;B. Csathó;E. Frederick;S. Gogineni;W. Krabill;S. Manizade;E. Rignot

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1993年和1998年在格陵兰岛东部Kangerdlugssuaq冰川上空进行的飞机激光高度计测量表明,在5年的过渡期间,所有测量到的冰锋70公里以内的地区变薄了几米,最后5公里上升到50米。这种快速变薄最好的解释是增加的排放速度和相关的蠕变变薄,最可能是由于冰川床的加强润滑造成的。在过去的十年里,正在崩解的冰锋占据了与1966年大致相同的位置。1995/96年的速度估计与1966年和1988年的速度估计值大致相同,但明显低于1999年的速度估计值,这表明主要的变薄始于1995年后。
Aircraft laser‐altimeter surveys in 1993 and 1998 over Kangerdlugssuaq Glacier in east Greenland reveal thinning, over the 5‐year interim, of several meters for all surveyed areas within 70 km of the seaward ice front, rising to 50 meters in the final 5 km. Such rapid thinning is best explained by increased discharge velocities and associated creep thinning, most probably caused by enhanced lubrication of the glacier bed. The calving ice front over the past decade has occupied approximately the same location as in 1966. Velocity estimates for 1995/96 are about the same as those for 1966 and 1988, but significantly less than for 1999, suggesting that major thinning began after 1995.