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《Chinese Journal of Geophysics》 2014-03
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Construction and quasi-stable analysis of topographic/isostatic potential coefficients of gravity field

WANG Kai;ZHANG Chuan-Ding;WU Xing;HOU Qiang;Center for Engineering Design and Research under the Headquarters of General Equipment;Stake Key Laboratory of Geodesy and Earth′s Dynamics;College of Earth Science,University of Chinese Academy of Sciences;Global Information Application and Development Center of Beijing;61287 Troops;  
Isostasy is a key method in the gravity data extrapolation where no measurement information is available,which has already been used in the establishment of the Earth′s Gravity Models(EGM).Based on topographic data,the construction of topographic/isostatic(t/i)EGM was studied here.The depths of compensation of the two isostatic models were analyzed to showthe proper ones are 50km and 40km,respectively.According to gravity model from satellite gradiometry data only,the precision of layer condensation model is better than that of the Airy model in low frequencies till degree 120,while on the contrary between degree 121and 250. Besides,combined model is better than any single model.Then,based on EGM2008,the quasistable analysis of the t/i potential model was made with gravity anomalies of various resolutions. It shows that the t/i spectrum of the quasi-stable model with 30′datum almost meets with that of EGM2008up to degree 360.Compared to EGM2008,the relative accumulative geoid height error up to degree 140is 6.83cm while the relative accumulative gravity anomaly error up to degree 220 is 1.10mGal.
【Fund】: 国家自然科学基金(41174026 41104047 41304022);; 地球空间环境和大地测量教育部重点实验室开放基金(11-01-03);; 大地测量与地球动力学国家重点实验室开放基金资助
【CateGory Index】: P312.1
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