Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise
Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise
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DOI：
10.1029/2011gl046583
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发表时间：
2011-03-04
影响因子：
5.2
通讯作者：
Lenaerts, J.
中科院分区：
文献类型：
--
作者：
Rignot, E.;Velicogna, I.;Lenaerts, J.
冰盖质量平衡的估计已大大改善，近年来使用各种技术，在不同的时间段，并在不同层次的空间细节。由于每种方法固有的不确定性，独立估计之间缺乏详细的比较，以及冰盖表面质量平衡的时间调制效应，这些估计之间仍然存在相当大的差异。在这里，我们提出了一个一致的记录质量平衡的格陵兰岛和南极冰盖在过去的二十年中，验证了两个独立的技术在过去8年的比较：一个差分周长损失从净积累，和一个使用密集的时间序列的时变重力。我们发现这两种技术之间的绝对质量损失和质量损失的加速非常吻合。2006年，格陵兰岛和南极冰盖的总质量损失为475 +/- 158 Gt/年，相当于海平面上升1.3 +/- 0.4毫米/年。值得注意的是，在过去18年中，格陵兰岛冰盖损失的加速速度为21.9 +/- 1 Gt/yr（2），南极洲为14.5 +/- 2 Gt/yr（2），合计为36.3 +/- 2 Gt/yr（2）。这一加速度是山地冰川和冰盖的3倍（12 +/- 6 Gt/yr（2））。如果这一趋势继续下去，冰盖将成为世纪海平面上升的主要因素。引用：Rignot，E.，I.韦利科尼亚湾R.货车den Broeke，A. Monaghan和J. Lenaerts（2011年），格陵兰和南极冰盖对海平面上升的贡献加速，地球物理学。保留信函：38，L05503，doi：10.1029/2011GL046583。
Ice sheet mass balance estimates have improved substantially in recent years using a variety of techniques, over different time periods, and at various levels of spatial detail. Considerable disparity remains between these estimates due to the inherent uncertainties of each method, the lack of detailed comparison between independent estimates, and the effect of temporal modulations in ice sheet surface mass balance. Here, we present a consistent record of mass balance for the Greenland and Antarctic ice sheets over the past two decades, validated by the comparison of two independent techniques over the last 8 years: one differencing perimeter loss from net accumulation, and one using a dense time series of time-variable gravity. We find excellent agreement between the two techniques for absolute mass loss and acceleration of mass loss. In 2006, the Greenland and Antarctic ice sheets experienced a combined mass loss of 475 +/- 158 Gt/yr, equivalent to 1.3 +/- 0.4 mm/yr sea level rise. Notably, the acceleration in ice sheet loss over the last 18 years was 21.9 +/- 1 Gt/yr(2) for Greenland and 14.5 +/- 2 Gt/yr(2) for Antarctica, for a combined total of 36.3 +/- 2 Gt/yr(2). This acceleration is 3 times larger than for mountain glaciers and ice caps (12 +/- 6 Gt/yr(2)). If this trend continues, ice sheets will be the dominant contributor to sea level rise in the 21st century. Citation: Rignot, E., I. Velicogna, M. R. van den Broeke, A. Monaghan, and J. Lenaerts (2011), Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise, Geophys. Res. Lett., 38, L05503, doi:10.1029/2011GL046583.