Abstract
Abstract The objective of this study is to investigate the effect of the Baltic Sea non-tidal loading in the territory of Latvia using observations of the GNSS continuously operating reference stations (CORS) of LatPos, EUPOS®-Riga, EPN and EstPos networks. The GNSS station daily coordinate time series obtained in a double-difference (DD) mode were used. For representation of the sea level dynamics, the Latvian tide gauge records were used. Performed correlation analysis is based on yearly data sets of these observations for the period from 2012 up to 2020. The approach discloses how the non-tidal loading can induce variations in the time series of the regional GNSS station network. This paper increases understanding of the Earth’s surface displacements occurring due to the non-tidal loading effect in Latvia, and is intended to raise the importance and necessity of improved Latvian GNSS time series by removing loading effects.
Highlights
The thorough analysis of GNSS time series provides the velocity field, which can indicate the vertical and horizontal crustal motions
The objective of this study is to investigate the effect of the Baltic Sea non-tidal loading in the territory of Latvia using observations of the GNSS continuously operating reference stations (CORS) of LatPos, EUPOS®-Riga, EUREF Permanent GNSS Network (EPN) and EstPos networks
The correlation analysis is based on the GNSS station daily coordinate time series and the Latvian tide gauge records, performed using yearly data sets of the period from 2012 up to 2020
Summary
The thorough analysis of GNSS time series provides the velocity field, which can indicate the vertical and horizontal crustal motions. No less important factor is to obtain velocity field eliminating the effect of the Baltic Sea non-tidal loading in GNSS time series, especially in the case of Latvia, where it is critically important to understand current situation of the geodynamic processes and future scenarios of the shoreline changes. In [12] the tide gauge data were used to estimate NTOL effect on the vertical coordinates of 7 GPS stations on the Baltic Sea. The authors found. The authors concluded that due to the small areal extent and complex shape of the studied geographical region, the Baltic Sea is probably close to the limit of detection for GRACE They found that mass variations on monthly scales can be well described by surfaces fitted to tide gauge measurements alone. The approach discloses more obviously how the effect of NTOL can induce seasonal variations in the time series of the regional GNSS station network, and how regionally related results are affected from year to year
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