Ice flow dynamics and mass loss of Totten Glacier, East Antarctica, from 1989 to 2015
Ice flow dynamics and mass loss of Totten Glacier, East Antarctica, from 1989 to 2015
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DOI：
10.1002/2016gl069173
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发表时间：
2016-06-28
影响因子：
5.2
通讯作者：
Mouginot, Jeremie
中科院分区：
文献类型：
--
作者：
Li, Xin;Rignot, Eric;Mouginot, Jeremie
托滕冰川拥有东南极洲最大的冰流量和一个大部分低于海平面的盆地。卫星测高数据显示，快速流动区域的冰层变薄。在这里，我们使用陆地卫星和干涉合成孔径雷达数据，结合冰桥行动的冰厚度和区域大气气候模型的表面质量平衡，展示了从 1989 年到 2015 年的冰速度测量的时间序列。我们发现，1989-1996年冰川速度超过了其平衡速度，2000年减缓了11 +/- 12%，使其冰通量与积累保持平衡（65 +/- 4 Gt/yr），然后加速了18 +/- 3%，直到2007年，此后保持恒定。平均冰质量损失 (7 +/- 2 Gt/年) 主要由冰动力学 (73%) 决定。其加速度 (0.6 +/- 0.3 Gt/yr(2)) 主要由表面质量平衡 (80%) 决定。当海洋温度升高时，冰速度明显增加，这表明冰动力学与海洋温度之间存在联系。
Totten Glacier has the largest ice discharge in East Antarctica and a basin grounded mostly below sea level. Satellite altimetry data have revealed ice thinning in areas of fast flow. Here we present a time series of ice velocity measurements spanning from 1989 to 2015 using Landsat and interferometric synthetic-aperture radar data, combined with ice thickness from Operation IceBridge, and surface mass balance from Regional Atmospheric Climate Model. We find that the glacier speed exceeded its balance speed in 1989-1996, slowed down by 11 +/- 12% in 2000 to bring its ice flux in balance with accumulation (65 +/- 4 Gt/yr), then accelerated by 18 +/- 3% until 2007, and remained constant thereafter. The average ice mass loss (7 +/- 2 Gt/yr) is dominated by ice dynamics (73%). Its acceleration (0.6 +/- 0.3 Gt/yr(2)) is dominated by surface mass balance (80%). Ice velocity apparently increased when ocean temperature was warmer, which suggests a linkage between ice dynamics and ocean temperature.