Using satellite laser ranging to measure ice mass change in Greenland and Antarctica
Using satellite laser ranging to measure ice mass change in Greenland and Antarctica
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DOI：
10.5194/tc-12-71-2018
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
J. Bonin;D. Chambers;M. Cheng
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文献类型：
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作者：
J. Bonin;D. Chambers;M. Cheng
摘要。对格陵兰岛和南极洲上空的卫星激光测距（SLR）数据进行最小二乘反演，可以将基于重力的质量损失估计延长至20世纪90年代初，并填补当前重力恢复和气候实验（GRACE）与未来GRACE后续任务之间的任何空白。模拟结果表明，在SLR数据有限的空间分辨率下，格陵兰岛和南极洲之间的质量变化是不可能分离的，但估计两个地区的总质量变化是可行的。当将该方法应用于实际SLR和GRACE重力序列时，我们发现反向质量损失的估计存在显著差异。两种反向数据类型之间存在巨大的、不可预测的年际差异，这使我们得出结论，目前的5×5球面谐波单反系列不能用来代替GRACE。然而，与较长的IMBIE时间序列的比较表明，在20年的时间框架内，倒SLR序列的年际偏移可能会平均，并且长期质量损失估计可能是合理的。
Abstract. A least squares inversion of satellite laser ranging (SLR) data over Greenland and Antarctica could extend gravimetry-based estimates of mass loss back to the early 1990s and fill any future gap between the current Gravity Recovery and Climate Experiment (GRACE) and the future GRACE Follow-On mission. The results of a simulation suggest that, while separating the mass change between Greenland and Antarctica is not possible at the limited spatial resolution of the SLR data, estimating the total combined mass change of the two areas is feasible. When the method is applied to real SLR and GRACE gravity series, we find significantly different estimates of inverted mass loss. There are large, unpredictable, interannual differences between the two inverted data types, making us conclude that the current 5×5 spherical harmonic SLR series cannot be used to stand in for GRACE. However, a comparison with the longer IMBIE time series suggests that on a 20-year time frame, the inverted SLR series' interannual excursions may average out, and the long-term mass loss estimate may be reasonable.