Ambiguous stability of glaciers at bed peaks

Ambiguous stability of glaciers at bed peaks
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床峰冰川的稳定性不明确

DOI:
10.1017/jog.2022.31
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发表时间:
2022
影响因子:
3.4
通讯作者:
Simkins, Lauren M.
Simkins, Lauren M.
中科院分区:
地球科学3区
文献类型:
--
作者:
Robel, Alexander A.;Pegler, Samuel S.;Catania, Ginny;Felikson, Denis;Simkins, Lauren M.

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在加深(逆行)的河床地形上,冰川退缩的冰通量增加,这与格陵兰和南极冰盖最近质量损失的加速有关。我们在观察中发现,尽管气候发生了重大变化,但一些冰川仍保持在河床地形的顶端,没有退缩。观察还表明,在局部海洋或大气变暖开始几年或几十年后,一些冰川会突然退缩,这些冰川一直停留在冰床的顶端。通过模型模拟,我们发现冰川在冰床峰顶的持续性是由于冰川沿着反向倾斜的冰床向山顶流动时速度变慢所致。冰川在床顶的坚持可能会导致两种截然不同的未来行为:一种是无限期地在床峰持续存在,另一种是冰川在气候强迫后可能长期延迟后从床峰撤退。然而,根据目前的观察结果,几乎不可能区分这两种未来行为中的哪一种会发生。我们的结论是,通过观察持续性来推断冰川的稳定性,掩盖了我们在气候变化下对未来海平面上升的真正承诺。我们建议,需要对看似稳定的冰川进行进一步研究,以确定它们可能的未来。
Increasing ice flux from glaciers retreating over deepening (retrograde) bed topography has been implicated in the recent acceleration of mass loss from the Greenland and Antarctic ice sheets. We show in observations that some glaciers have remained at peaks in bed topography without retreating despite enduring significant changes in climate. Observations also indicate that some glaciers which persist at bed peaks undergo sudden retreat years or decades after the onset of local ocean or atmospheric warming. Using model simulations, we show that persistence of a glacier at a bed peak is caused by ice slowing as it flows up a reverse-sloping bed to the peak. Persistence at bed peaks may lead to two very different future behaviors for a glacier: one where it persists at a bed peak indefinitely, and another where it retreats from the bed peak after potentially long delays following climate forcing. However, it is nearly impossible to distinguish which of these two future behaviors will occur from current observations. We conclude that inferring glacier stability from observations of persistence obscures our true commitment to future sea-level rise under climate change. We recommend that further research is needed on seemingly stable glaciers to determine their likely future.
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