GRACE leakage error correction with regularization technique: case studies in Greenland and Antarctica
GRACE leakage error correction with regularization technique: case studies in Greenland and Antarctica
复制标题
使用正则化技术进行 GRACE 泄漏误差修正：格陵兰岛和南极洲的案例研究
DOI：
10.1093/gji/ggw494
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发表时间：
2017-03-01
影响因子：
2.8
通讯作者：
Peng, Peng
中科院分区：
文献类型：
--
作者：
Mu, Dapeng;Yan, Haoming;Peng, Peng
滤波是重力恢复与气候实验（GRACE）数据处理中必不可少的一步，但滤波会导致信号明显的泄漏和衰减，影响全球和区域质量变化估计的质量。我们提出了使用Tikhonov正则化技术与L曲线方法来解决一个校正方程，可以减少所涉及的滤波器在GRACE数据处理的泄漏误差。我们首先证明了高斯滤波器引起的泄漏误差可以很好地纠正我们的正则化技术与模拟研究在格陵兰岛和南极洲。此外，我们的正则化技术可以恢复原始质量变化的空间分布。例如，在将正则化方法应用于GRAEC数据（2003-2012年）后，我们发现GRACE质量变化倾向于从格陵兰岛的内陆向沿海地区移动，这与最近的其他研究一致。在对冰川均衡调整效应进行校正后，我们的结果显示，2003年至2012年格陵兰和南极的冰质量损失率分别为274 +/- 30和107 +/- 34 Gt yr（-1）。在格陵兰内陆也检测到10 +/-4Gt/yr（-1）的增长率。
Filtering is a necessary step in the Gravity Recovery and Climate Experiment (GRACE) data processing, but leads to signal leakage and attenuation obviously, and adversely affects the quality of global and regional mass change estimates. We propose to use the Tikhonov regularization technique with the L-curve method to solve a correction equation which can reduce the leakage error caused by filter involved in GRACE data processing. We first demonstrate that the leakage error caused by the Gaussian filter can be well corrected by our regularization technique with simulation studies in Greenland and Antarctica. Furthermore, our regularization technique can restore the spatial distribution of original mass changes. For example, after applying the regularization method to GRAEC data (2003-2012), we find that GRACE mass changes tend to move from interior to coastal area in Greenland, which are consistent with recent other studies. After being corrected for glacial isostatic adjustment effect, our results show that the ice mass loss rates were 274 +/- 30 and 107 +/- 34 Gt yr(-1) in Greenland and Antarctica from 2003 to 2012, respectively. And a 10 +/- 4 Gt yr(-1) increase rate in Greenland interior is also detected.