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Seasonal variations of Earth's surface deformation estimated from GPS and satellite gravimeter

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Authors:Zhang Liangjing; Jin Shuanggen; Zhang Tengyu
Author Affiliations:Primary:
Chinese Academy of Sciences, Shanghai Astronomical Observatory, Shanghai, China
Other:
Graduate University of the Chinese Academy of Sciences, China
Volume Title:Dadi Celiang yu Diqiu Dongli Xue Journal of Geodesy and Geodynamics
Source:Dadi Celiang yu Diqiu Dongli Xue = Journal of Geodesy and Geodynamics, 32(2), p.32-38. Publisher: Gai Kan Bianjibu, Wuhan, China. ISSN: 1671-5942
Publication Date:2012
Note:In Chinese with English summary. 28 refs.; illus., incl. 1 table
Summary:We computed and compared the vertical loading deformation from GPS and GRACE and found that at most global sites, the root mean square (RMS) of GPS coordinate time series decreased after removing the GRACE estimates, and the annual variations of the GPS height at most sites also agree well with GRACE or geophysical model estimates in the amplitude and phase. It indicates that the nonlinear seasonal GPS vertical variation is mainly caused by the geophysical loads. However, at some sites, particularly in the Antarctica, some ocean coasts and small peninsulas, large discrepancy has been found between the estimates with the two techniques. We analyzed and discussed the error sources of the discrepancies between GPS and GRACE and their effects, which is proved by a good agreement with geophysical models, and the remaining disagreement may be due to the GPS technical errors. It needs to further investigate using longer and more GPS and GRACE measurements.
Subjects:Deformation; Earth; Geodesy; Global navigation satellite systems; Global Positioning System; GRACE; Gravimeters; Gravity field; Remote sensing; Satellite methods; Seasonal variations
Record ID:783811-8
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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