地壳结构对GRACE估算中国大陆地表垂直负荷形变的影响
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doi:10.11867/j.issn.1001-8166.2014.07.0828

根据重力卫星GRACE(Gravity Recovery and Climate Experiment)估算固体地表垂直负荷形变时通常采用的PREM (Preliminary Reference Earth Model) 地球模型不能较好地反映中国大陆特别是青藏高原巨厚的地壳结构。基于考虑中国大陆区域地壳结构的地球模型计算了新的负荷勒夫数,探讨了地壳结构差异对GRACE卫星RL05观测数据估算中国大陆地表垂直负荷形变的影响。结果表明,区域地壳结构差异对GRACE估算中国大陆地表负荷形变的影响较为明显,90阶垂直位移负荷勒夫数的相对差异接近11%;前90阶垂直负荷形变差异的极值出现在青藏高原东南部,最大相对差异达到10%左右,均方根相对差异为4%。建议利用GRACE卫星RL05数据估算中国大陆地表垂直负荷形变时,应该使用更加趋于真实的区域地壳结构替代PREM模型的相应部分。

关键词: 卫星重力, 地表质量负荷, 垂直形变, 区域地壳结构, 中国大陆

When the inversion of vertical load deformation on Earth’s surface using GRACE (Gravity Recovery and Climate Experiment) data, the load Love numbers based on PREM (Preliminary Reference Earth Model) are commonly used. But the crustal structure under China mainland especially under Tibet Plateau is quite different from that given by PREM Earth model. New load Love numbers were calculated based on a modified Earth model which accounted for regional crustal structure in China mainland. And the effect of regional crustal structure in China mainland for estimation of vertical load deformation on Earth’s surface using GRACE RL05 data was investigated in this paper. It is found that the effect of crustal difference is very prominent. The relative difference of load Love numbers for vertical deformation can reach about 11% at degree 90. The extreme value of difference in vertical load deformation below 90 degree of spherical harmonic coefficients located at the southeastern Tibet Plateau and the maximum relative difference reaches 10%. The relative difference of the root mean square is about 4%. It is suggesting that an Earth model with a more realistic crustal structue instead of PREM should be used for the estimation of vertical load deformation in China mainland espacially in Tibet Plateau.

Key words: Satellite gravity, Solid Earth mass loading, Vertical deformation, Regional crustal structure, China mainland.

中图分类号:

P312.1

图1 M-PREM和PREM地球模型参数差异

Fig.1 The difference of parameters from M-PREM and PREM

图2 （a）基于M-PREM和PREM地球模型的负荷勒夫数及（b）相对差异

Fig.2 (a) Values of load Love numbers based on M-PREM and PREM earth model and (b) the relative difference

图3 （a）基于M-PREM和PREM地球模型的因子 B _l值及（b）相对差异

Fig.3 (a) Values of B _l based on M-PREM and PREM Earth model and (b) the relative difference

图4 基于M-PREM模型的垂直负荷形变线性趋势

Fig.4 Linear trend of vertical load deformation based on M-PREM

图5 不同地壳结构估算垂直负荷形变的差异

Fig.5 Difference of inversion of vertical load deformation based on different crustal structure

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摘要

Effects of Crustal Structure for Estimation of Vertical Load Deformation on the Solid Earth Using GRACE in China Mainland