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Channelized bottom melting and stability of floating ice shelves

机译：通道化底部融化和浮冰架的稳定性

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摘要

The floating ice shelf in front of Petermann Glacier, in northwest Greenland, experiences massive bottom melting that removes 80% of its ice before calving into the Arctic Ocean. Detailed surveys of the ice shelf reveal the presence of 1 - 2 km wide, 200 - 400 m deep, sub-ice shelf channels, aligned with the flow direction and spaced by 5 km. We attribute their formation to the bottom melting of ice from warm ocean waters underneath. Drilling at the center of one of channel, only 8 m above sea level, confirms the presence of ice-shelf melt water in the channel. These deep incisions in ice-shelf thickness imply a vulnerability to mechanical break up and climate warming of ice shelves that has not been considered previously.
机译：格陵兰岛西北部彼得曼冰川前的浮动冰架经历了巨大的底部融化，在冰崩成北冰洋之前将其冰的80％清除了。对冰架的详细调查显示，存在1-2 km宽，200-400 m深的子冰架通道，它们与流向对齐且相隔5 km。我们将其形成归因于来自温暖海水的冰层底部融化。在一条通道的中心进行钻探，该通道仅高出海平面8 m，这证实了通道中存在冰架融化水。冰架厚度上的这些深层切口暗示了以前从未考虑过的冰架机械破裂和气候变暖的脆弱性。

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