| 基于GRACE KBRR数据的动力积分法反演时变重力场模型 |
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| 引用本文： | 罗志才, 周浩, 李琼, 钟波. 基于GRACE KBRR数据的动力积分法反演时变重力场模型[J]. 地球物理学报, 2016, 59(6): 1994-2005, doi: 10.6038/cjg20160606 |
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| 作者姓名： | 罗志才 周浩 李琼 钟波 |
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| 作者单位： | 1. 武汉大学测绘学院, 武汉 430079; 2. 华中科技大学物理学院, 武汉 430074; 3. 华中科技大学地球物理研究所, 武汉 430074; 4. 武汉大学地球空间环境与大地测量教育部重点实验室, 武汉 430079 |
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| 基金项目： | 国家自然科学基金项目(41131067,41374023,41474019,41504014,41504015);大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2015-1-3-E);中国博士后科学基金项目(2016M592337)资助. |
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| 摘 要： | 基于动力积分法恢复了一组60阶的时变重力场模型WHU-Grace01s,且在位系数解算过程中仅使用KBRR数据.通过与CSR、GFZ和JPL发布的Release 05模型的阶方差和位系数误差谱对比可知,WHU-Grace01s模型在高阶次部分的阶方差较小,且对轨道共振现象不敏感.将WHU-Grace01s时变重力场模型与CSR、GFZ、JPL、DEOS、Tongji、ITG、AIUB和GRGS等8家机构发布模型通过相同的滤波处理,获得了全球地表质量变化的时空分布,从结果可以看出:各个模型计算的时变信号在空域上分布十分接近,且WHU-Grace01s模型计算的太平洋中心和撒哈拉沙漠区域的质量变化较小;对比几个典型质量变化区域,WHU-Grace01s模型和JPL模型计算的长江流域和珠江流域时变信号呈强相关,其相关系数分别为0.948和0.976,且与上述8个模型计算的两个流域时变信号的相关系数均达到0.9以上;在南极区域和格陵兰岛,WHU-Grace01s模型和其他各个模型均能反映区域冰川质量的积累或消融,且各模型计算获得的长期趋势变化结果相当.研究结果表明,WHU-Grace01s模型和国内外已发布机构模型具有很好的一致性,且受到轨道共振影响较小.
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| 关 键 词： | 时变重力场模型 GRACE 动力积分法 卫星重力 |
| 收稿时间： | 2015-01-27 |
| 修稿时间： | 2015-06-15 |
A new time-variable gravity field model recovered by dynamic integral approach on the basis of GRACE KBRR data alone |
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| LUO Zhi-Cai, ZHOU Hao, LI Qiong, ZHONG Bo. A new time-variable gravity field model recovered by dynamic integral approach on the basis of GRACE KBRR data alone[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(6): 1994-2005, doi: 10.6038/cjg20160606 |
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| Authors: | LUO Zhi-Cai ZHOU Hao LI Qiong ZHONG Bo |
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| Affiliation: | 1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China; 2. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; 3. Institute of Geophysics, Huazhong University of Science and Technology, Wuhan 430074, China; 4. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China |
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| Abstract: | A new monthly time-variable gravity field model WHU-Grace01s truncated to 60 degrees and orders is determined solely from GRACE KBRR data using dynamic integral approach in this paper. Compared with the Release 05 models from CSR, GFZ and JPL, the degree variance of WHU-Grace01s are smaller in high degrees, and it is not very sensitive to orbit resonance phenomenon. After applying the same filter to the temporal signals derived from the time-variable gravity field models published by WHU, CSR, GFZ, JPL, DEOS, Tongji, ITG, AIUB and GRGS, we can get several useful conclusions as follows, the distribution of temporal signal computed by WHU-Grace01s is similar to the other models, and its signal in the Pacific Ocean center and Sahara desert is relative smaller. The correlation coefficients of the temporal signal in Yangtze river and Pearl river basin between WHU-Grace01s and JPL can reach to 0.948 and 0.976 respectively, the average correlations coefficients between WHU-Grace01s and the aforementioned 8 time-variable gravity field models is bigger than 0.90. All of the aforementioned time-variable gravity field models can detect the mass loss or accumulation in the Antarctica and Greenland, and the mass loss rate is similar to each other. In short, the accuracy of WHU-Grace01s has a good consistency with the previously published GRACE solutions, while the impact of orbit resonance on WHU-Grace01s is unconspicuous. |
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| Keywords: | Time-variable gravity field model GRACE Dynamic integral approach Satellite gravity |
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