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地壳结构对GRACE估算中国大陆地表垂直负荷形变的影响*

DOI: 10.11867/j.issn.1001-8166.2014.07.0828, PP. 828-834

Keywords: 卫星重力,地表质量负荷,垂直形变,区域地壳结构,中国大陆

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Abstract:

根据重力卫星GRACE(GravityRecoveryandClimateExperiment)估算固体地表垂直负荷形变时通常采用的PREM(PreliminaryReferenceEarthModel)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。

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