An improved mass budget for the Greenland ice sheet
An improved mass budget for the Greenland ice sheet
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DOI：
10.1002/2013gl059010
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发表时间：
2014-02-16
影响因子：
5.2
通讯作者：
van den Broeke, Michiel R.
中科院分区：
文献类型：
--
作者：
Enderlin, Ellyn M.;Howat, Ian M.;van den Broeke, Michiel R.
美国宇航局的冰桥行动进行了广泛的冰厚度调查，对格陵兰岛大部分海洋终止出口冰川进行了十多年的高精度冰排放测量，促使人们重新评估冰川变化的时间和空间分布。对 178 个出口冰川的年度测量表明，尽管加速现象广泛存在，但自 2000 年以来，由于加速而损失的 73929 Gt 冰量中，只有 15 个冰川占了 77%，另外 4 个冰川则占了大约 50%。损失最大的来源之一是一些几乎没有受到科学关注的冰川。冰排放对总损失的相对贡献从2005年之前的58%下降到2009年至2012年间的32%。因此，2009年后质量损失增加的84%是由于地表径流增加所致。这些观测结果支持最近的模型预测，即表面质量平衡，而不是冰动力学，将主导冰盖对 21 世纪海平面上升的贡献。 要点 动态质量损失主要由以下因素控制：
Extensive ice thickness surveys by NASA's Operation IceBridge enable over a decade of ice discharge measurements at high precision for the majority of Greenland's marine-terminating outlet glaciers, prompting a reassessment of the temporal and spatial distribution of glacier change. Annual measurements for 178 outlet glaciers reveal that, despite widespread acceleration, only 15 glaciers accounted for 77% of the 73929 Gt of ice lost due to acceleration since 2000 and four accounted for similar to 50%. Among the top sources of loss are several glaciers that have received little scientific attention. The relative contribution of ice discharge to total loss decreased from 58% before 2005 to 32% between 2009 and 2012. As such, 84% of the increase in mass loss after 2009 was due to increased surface runoff. These observations support recent model projections that surface mass balance, rather than ice dynamics, will dominate the ice sheet's contribution to 21st century sea level rise.Key Points Dynamic mass loss is mostly controlled by