Summer surface melt thins Petermann Gletscher Ice Shelf by enhancing channelized basal melt

Summer surface melt thins Petermann Gletscher Ice Shelf by enhancing channelized basal melt
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夏季地表融化通过增强通道化基底融化而使彼得曼冰川冰架变薄

DOI:
10.1017/jog.2019.43
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发表时间:
2019
影响因子:
3.4
通讯作者:
PADMAN, LAURIE
PADMAN, LAURIE
中科院分区:
地球科学3区
文献类型:
--
作者:
WASHAM, PETER;NICHOLLS, KEITH W.;MÜNCHOW, ANDREAS;PADMAN, LAURIE

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不断上升的海洋和空气温度导致格陵兰岛几个出口冰川的浮冰架消失;然而,人们对这些外部强迫的具体作用仍然知之甚少。在这里,我们使用来自格陵兰岛西北部彼得曼格莱彻冰架的大气、海洋学和冰川学时间序列数据,量化了距离大型亚冰架通道内基准线约16公里处的冰架上的海洋和大气的强迫。这里的基础融化速率显示出强烈的季节性,在夏季融化季节,从冬季平均2 ma - 1上升到最高80 ma - 1。基础融化速率的增加证实了格陵兰岛周围夏季大气变暖与海洋迫使其剩余冰架加速融化之间的直接联系。我们将这种加速融化归因于在接地线上冰下径流流入海洋的增加,这加强了冰下流,并推动了更大的海洋热通量流向冰基。
Increasing ocean and air temperatures have contributed to the removal of floating ice shelves from several Greenland outlet glaciers; however, the specific contribution of these external forcings remains poorly understood. Here we use atmospheric, oceanographic and glaciological time series data from the ice shelf of Petermann Gletscher, NW Greenland to quantify the forcing of the ocean and atmosphere on the ice shelf at a site ~16 km from the grounding line within a large sub-ice-shelf channel. Basal melt rates here indicate a strong seasonality, rising from a winter mean of 2 m a−1 to a maximum of 80 m a−1 during the summer melt season. This increase in basal melt rates confirms the direct link between summer atmospheric warming around Greenland and enhanced ocean-forced melting of its remaining ice shelves. We attribute this enhanced melting to increased discharge of subglacial runoff into the ocean at the grounding line, which strengthens under-ice currents and drives a greater ocean heat flux toward the ice base.
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