Comparison of polar motion excitation series derived from GRACE and from analyses of geophysical fluids
Comparison of polar motion excitation series derived from GRACE and from analyses of geophysical fluids
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DOI：
10.1029/2006gl028983
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发表时间：
2007-06
影响因子：
5.2
通讯作者：
J. Nastula;R. Ponte;D. Salstein
中科院分区：
文献类型：
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作者：
J. Nastula;R. Ponte;D. Salstein
利用空间研究中心（CSR）、喷气推进实验室（JPL）和地球地质研究中心（GFZ）处理的重力恢复与气候实验（GRACE）数据得到的重力场的三组度- 2、阶- 1次谐波，计算了极运动激励函数χ1和χ2。在去除海流和大气风的影响后，GFZ和JPL的激励以及CSR χ2的激励与大地观测的激励一般比较好。该协议大大超过了以往GRACE数据发布的协议。对于JPL系列，与大地观测的相关水平和解释的方差与独立于现有模式和大气、海洋和陆地水文分析获得的相关水平相当，但仍低于。重力任务的数据质量仍然需要改进，以便对质量相关的极运动激励提供更严格的约束。
Three sets of degree‐2, order‐1 harmonics of the gravity field, derived from the Gravity Recovery and Climate Experiment (GRACE) data processed at the Center for Space Research (CSR), Jet Propulsion Laboratory (JPL) and GeoforschungsZentrum (GFZ), are used to compute polar motion excitation functions χ1 and χ2. The GFZ and JPL excitations and the CSR χ2 excitation compare generally well with geodetically observed excitation after removal of effects of oceanic currents and atmospheric winds. The agreement considerably exceeds that from previous GRACE data releases. For the JPL series, levels of correlation with the geodetic observations and the variance explained are comparable to, but still lower than, those obtained independently from available models and analyses of the atmosphere, ocean, and land hydrology. Improvements in data quality of gravity missions are still needed to deliver even tighter constraints on mass‐related excitation of polar motion.