Estimating geocenter variations from a combination of GRACE and ocean model output
Estimating geocenter variations from a combination of GRACE and ocean model output
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DOI：
10.1029/2007jb005338
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发表时间：
2008-08-19
影响因子：
3.9
通讯作者：
Wahr, John
中科院分区：
文献类型：
--
作者：
Swenson, Sean;Chambers, Don;Wahr, John
在这项研究中，我们从重力恢复和气候实验(GRACE)卫星任务的数据和海洋模型的输出相结合来估计地心异常的时间序列。导出了地心总变化量与二阶及以上GRACE系数和一阶系数的海洋分量之间的矩阵方程。我们从两个最先进的海洋模型中估计了海洋成分。将结果与从其他卫星数据(如卫星激光测距和GPS)得出的地心独立估计进行比较。最后，我们计算了与GRACE二级重力场系数处理一致的一阶系数。估计的一阶系数可以用来改进GRACE对质量变异性的估计，而GRACE本身不能直接提供这些估计。
In this study, we estimate a time series of geocenter anomalies from a combination of data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission and the output from ocean models. A matrix equation is derived relating total geocenter variations to the GRACE coefficients of degrees two and higher and to the oceanic component of the degree one coefficients. We estimate the oceanic component from two state-of-the-art ocean models. Results are compared to independent estimates of geocenter derived from other satellite data, such as satellite laser ranging and GPS. Finally, we compute degree one coefficients that are consistent with the processing applied to the GRACE Level-2 gravity field coefficients. The estimated degree one coefficients can be used to improve estimates of mass variability from GRACE, which alone cannot provide them directly.