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- 2016
GRACE RL05反演南极冰盖质量变化方法比较
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Abstract:
利用UTCSR发布的2003-01~2013-07GRACE RL05月平均重力场模型，分析比较了高斯滤波、各向异性滤波、扇形滤波和维纳滤波，并结合去相关滤波在反演南极地区冰盖质量变化方面的差异。通过计算得到以下结论：①基于121组重力场模型阶方差分布得到维纳滤波与半径为300 km的高斯滤波效果最为接近，说明300 km滤波半径完全可以满足质量变化信号的提取；②在一定范围内，提高滤波半径能提高反演结果信噪比，建议南极区域的滤波半径为500 km；采用相同滤波半径，不同空间滤波算法计算的质量变化率基本一致，在南极区域可以选取任一滤波方法；③与其他算法相比，去相关滤波算法能在一定程度消除球谐系数中存在的系统误差，改善反演结果
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