Evaluation of Recent GRACE and GOCE Satellite Gravity Models and Combined Models Using GPS/Leveling and Gravity Data in China
Evaluation of Recent GRACE and GOCE Satellite Gravity Models and Combined Models Using GPS/Leveling and Gravity Data in China
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DOI：
10.1007/978-3-319-10837-7_9
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Jiancheng Li;Weiping Jiang;X. Zou;Xinyu Xu-;W. Shen
中科院分区：
文献类型：
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作者：
Jiancheng Li;Weiping Jiang;X. Zou;Xinyu Xu-;W. Shen
利用中国大陆649个GPS水准点和799897个2′ × 2′格网平均重力异常，对最近发布的包括GOCE模型在内的地球重力模型（EGM）进行了评价（GO_CONS_GCF_2_TIM_R3（GO_TIM_R3），GRACE仅对ITG-Grace 2010进行建模，组合卫星重力场模型（GO_CONS_GCF_2_DIR_R3（GO_DIR_R3）、GOCO 03 S、DGM-1 S、EIGEN-5S、EIGEN-6S）和来自卫星观测和地面重力数据集的组合重力场模型（EIGEN-51 C、EIGEN-6C、GIF 48、EGM 2008）。统计结果表明，在中国大陆，最精确的模型是EIGEN-6C，其似大地水准面高差与GPS/水准资料的标准差为±0.183 m，重力异常与网格化平均重力异常的标准差为±22.5 mGal。对于EGM 2008，它们分别为±0.240 m和±24.0 mGal。在GRACE、GOCE和LAGEOS的卫星重力模型中，GO_TIM_R3是中国大陆最好的模型，其似大地水准面差和重力异常差的标准偏差分别为±0.459 m和±31.3 mGal，与EIGEN-6S、GOCO 03 S和GO_DIR_R3的标准偏差基本相当。这表明GOCE使命比以往的卫星重力探测任务能够在中国大陆恢复更多的中短波重力信号。
A total of 649 GPS/Leveling points and 799897 2′ × 2′ gridded mean gravity anomalies in mainland China are used for the evaluation of the recently released Earth Gravitational Models (EGMs) including the GOCE only models (GO_CONS_GCF_2_TIM_R3 (GO_TIM_R3), GRACE only models ITG-Grace2010s, combined satellite gravity field models (GO_CONS_GCF_2_DIR_R3 (GO_DIR_R3), GOCO03S, DGM-1S, EIGEN-5S, EIGEN-6S), and combined gravity field models (EIGEN-51C, EIGEN-6C, GIF48, EGM2008) from satellite observations and ground gravity data sets. The statistical results show that in mainland China the most precise model is EIGEN-6C with the standard deviation (STD) ±0.183 m of the quasi-geoid height differences compared with the GPS/Leveling data and the STD ±22.5 mGal of the gravity anomaly differences compared with the gridded mean gravity anomalies from observations. For EGM2008, they are ±0.240 m and ±24.0 mGal respectively. Among the satellite only gravity models from GRACE, GOCE and LAGEOS observations, GO_TIM_R3 is the best one in mainland China, and the STDs of the corresponding quasi-geoid differences and the gravity anomaly differences are ±0.459 m and ±31.3 mGal respectively, which are nearly at the same levels as the ones for the models EIGEN-6S, GOCO03S and GO_DIR_R3. This shows that the GOCE mission can recover more medium-short wavelength gravity signals in mainland China than former satellite gravity missions.