Global inter‐annual gravity changes from GRACE: Early results
Global inter‐annual gravity changes from GRACE: Early results
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DOI：
10.1029/2004gl020948
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发表时间：
2005-01
影响因子：
5.2
通讯作者：
O. Andersen;J. Hinderer
中科院分区：
文献类型：
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作者：
O. Andersen;J. Hinderer
利用GRACE卫星2002 ~ 2003年15个月的重力场解资料，对2002 ~ 2003年的重力场变化进行了研究。研究结果表明，GRACE卫星能够在1300 km以上的空间尺度上，以0.4 μGal的精度（对应于9 mm水厚）捕捉到地下水在年际尺度上的变化。研究了四个最广泛使用的全球水文模型与GRACE观测结果的空间比较，这些观测结果是由于大陆水储量的变化而引起的重力场年际变化。全球陆地数据同化系统模型在北方半球与GRACE观测的空间相关系数为0.65。这表明在这些尺度上观测到的重力场变化在很大程度上与大陆水储量的变化有关。
Fifteen monthly gravity field solutions from the GRACE twin satellites launched more than two years ago have been studied to estimate gravity field changes between 2002 and 2003.The results demonstrate that GRACE is capable of capturing the changes in ground water on inter‐annual scales with an accuracy of 0.4 μGal corresponding to 9 mm water thickness on spatial scales longer than 1300 km. Four of the most widely used global hydrological models have been investigated for their spatial comparison with GRACE observations of inter‐annual gravity field variations due to changes in continental water storage. The Global Land Data Assimilation System model has a spatial correlation coefficient with GRACE observations of 0.65 over the northern hemisphere. This demonstrates that the observed gravity field changes on these scales are largely related to changes in continental water storage.