Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE
Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE
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DOI：
10.1029/2009gl040222
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发表时间：
2009-10
影响因子：
5.2
通讯作者：
I. Velicogna
中科院分区：
文献类型：
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作者：
I. Velicogna
我们使用GRACE（重力恢复和气候实验）卫星重力使命每月测量的时变重力来确定2002年4月至2009年2月期间格陵兰和南极冰盖的冰质量损失。我们发现，在这段时间内，冰盖的质量损失不是一个常数，而是随着时间的推移而加速，即，GRACE观测数据的二次趋势比线性趋势更好地表示，这意味着冰盖对海平面的贡献随着时间的推移而变大。在格陵兰，质量损失从2002-2003年的1.37亿吨/年增加到2007-2009年的2.86亿吨/年，即，2002-2009年的加速度为−30 ± 11 Gt/yr 2。在南极洲，质量损失从2002-2006年的1.04亿吨/年增加到2006-2009年的2.46亿吨/年，即，2002-2009年的加速度为−26 ± 14 Gt/yr 2。观测到的冰盖质量损失的加速有助于协调GRACE对不同时期冰质量的估计。
We use monthly measurements of time‐variable gravity from the GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission to determine the ice mass‐loss for the Greenland and Antarctic Ice Sheets during the period between April 2002 and February 2009. We find that during this time period the mass loss of the ice sheets is not a constant, but accelerating with time, i.e., that the GRACE observations are better represented by a quadratic trend than by a linear one, implying that the ice sheets contribution to sea level becomes larger with time. In Greenland, the mass loss increased from 137 Gt/yr in 2002–2003 to 286 Gt/yr in 2007–2009, i.e., an acceleration of −30 ± 11 Gt/yr2 in 2002–2009. In Antarctica the mass loss increased from 104 Gt/yr in 2002–2006 to 246 Gt/yr in 2006–2009, i.e., an acceleration of −26 ± 14 Gt/yr2 in 2002–2009. The observed acceleration in ice sheet mass loss helps reconcile GRACE ice mass estimates obtained for different time periods.