Evaluation and analysis of GOCE earth gravity field model in Qinghai-Tibet region

Abstract

Abstract:

The Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) mission has provided several products of earth gravity field models computing by satellite gravity gradiometry (SGG) since its launch in 2009. In this paper, the precision of the GOCE gravity field models in Qinghai-Tibet area is tested by GPS-leveling and gravity anomaly data, and a new filter method is introduced as a reference in the course of gravity testing, The test results show that the medium order of GOCE models is better than other typical models in Qinghai-Tibet area. The next, the differences between GOCE-only model and the other three models are computed respectively in terms of geoid and gravity anomaly in Qinghai-Tibet region, then the spatial and the field source depth distribution which is first derived from statistic analysis method of the big difference are discussed. Based on the calculation results, some conclusions have been drawn as follows: in the horizontal direction, the obvious difference between the GOCE models and other typical models appear in the region where landform is complex such as Himalayas, Tianshan, et al; in the downwards direction, the large difference focus on the lithosphere.

Key words: GOCE, earth gravity field model, GPS-leveling, gravity anomaly, Qinghai-Tibet region, depth of field sources, lithosphere

CLC Number:

P312.1

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