Basal melting and freezing under the Amery Ice Shelf, East Antarctica

Basal melting and freezing under the Amery Ice Shelf, East Antarctica
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东南极洲阿默里冰架下的基底融化和冻结

DOI:
10.3189/002214310791190820
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发表时间:
2010-04
影响因子:
3.4
通讯作者:
Weili WANG
Weili WANG
中科院分区:
地球科学3区
文献类型:
--
作者:
K.C. JEZEK;Yafeng WANG;Jia Hong Wen;I. ALLISON;Hongxing LIU;Weili WANG

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本文对东南极Amery冰架底部的融化速率和冻结速率进行了估算,并绘制了它们的空间分布图。冰速度,表面海拔和积累率数据集的分析,沿着列平均冰密度模型。我们的分析表明,基底熔融的总面积为34700 km 2,年总熔融量为62.5 ± 9.3 Gt,平均熔融速率为1.8 ± 0.3 m a−1。底部冻结主要发生在冰架的西北部,总面积为26100 km 2,最大冻结速率为2.4 ± 0.4 m a−1。据估计,冰架底部的海冰总量为16.2 ± 2.4 Gt a−1。使用重新定义的接地线和Amery冰架的几何形状,我们估计冰架底部的净融化量约为46.4 ± 6.9 G ta−1,高于以前的建模和海洋学估计。净基底融化约占冰架总质量损失的一半,其余部分来自冰山排放。我们的基底融化和冻结分布图提供了一个科学的基础上定量分析冰-海洋相互作用的冰架-海洋界面。
Abstract The basal melting and freezing rates under the Amery Ice Shelf, East Antarctica, are evaluated, and their spatial distributions mapped. Ice velocity, surface elevation and accumulation rate datasets are employed in the analysis, along with a column-averaged ice density model. Our analysis shows that the total area of basal melting is 34 700 km2, with a total annual melt of 62.5 ± 9.3 Gt and an average melting rate of 1.8 ± 0.3 m a−1. Basal freezing mainly occurs in the northwestern part of the ice shelf, over a total area of 26 100 km2 and with a maximum freezing rate of 2.4 ± 0.4 m a−1. The total marine ice that accretes to the ice-shelf base is estimated to be 16.2 ± 2.4 Gt a−1. Using a redefined grounding line and geometry of the Amery Ice Shelf, we estimate the net melt over the ice-shelf base is about 46.4 ± 6.9 G ta−1, which is higher than previous modeling and oceanographic estimates. Net basal melting accounts for about half of the total ice-shelf mass loss, with the rest being from iceberg discharge. Our basal melting and freezing distribution map provides a scientific basis for quantitative analysis of ice–ocean interaction at the ice-shelf–ocean interface.
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