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Analysis of seasonal position variation for selected GNSS sites in Poland using loading modelling and GRACE data

Geodesy and Geodynamics 2017年第4期8卷 253-259页

作者： marcin rajner Tomasz Liwosz Warsaw University of Technology Department of Geodesy and Geodetic Astronomy

In this study we compared weekly GNSS position time series with modelled values of crustal deformations on the basis of Gravity Recovery and Climate Experiment(GRACE) *** Global Navigation Satellite Systems(GNSS) time series were taken from homogeneously reprocessed global network solutions within the International GNSS Service(IGS) Reprocessing 1 project and from regional solutions performed by Warsaw University of Technology(WUT) European Permanent Network(EPN) Local Analysis Center(LAC) within the EPN reprocessing *** GNSS sites from the territory of Poland with observation timespans between 2.5 and 13 years were selected for this *** Total Water Equivalent(TWE) estimation from GRACE data was used to compute deformations using the Green's function *** frequency components were removed from GRACE data to avoid aliasing *** GRACE observes mainly the mass transport in continental storage of water,we also compared GRACE deformations and the GNSS position time series,with the deformations computed on the basis of a hydrosphere *** used the output of Water GAP Hydrology Model(WGHM) to compute deformations in the same manner as for the GRACE *** WGHM gave slightly larger amplitudes than GNSS and *** atmospheric non-tidal loading effect was removed from GNSS position time series before comparing them with modelled *** results confirmed that the major part of observed seasonal variations for GNSS vertical components can be attributed to the hydrosphere *** results for these components agree very well both in the amplitude and *** decrease in standard deviation of the residual GNSS position time series for vertical components corrected for the hydrosphere loading reached maximally 36%and occurred for all but one stations for both global and regional *** horizontal components the amplitudes are about three times smaller than for vertical components therefore the comparison is muc

关键词： Mass transport Loading GRACE Hydrology model GNSS time series

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