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GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L01608, doi:10.1029/2003GL019106, 2004

Vertical crustal motion determined by satellite altimetry and tide gauge data in Fennoscandia

C. Y. Kuo

Laboratory for Space Geodesy and Remote Sensing, The Ohio State University, USA


C. K. Shum

Laboratory for Space Geodesy and Remote Sensing, The Ohio State University, USA


A. Braun

Byrd Polar Research Center, The Ohio State University, USA


J. X. Mitrovica

Department of Physics, University of Toronto, Canada


Abstract

We present a new method of combining satellite altimetry and tide gauge data to obtain improved estimates of absolute (or geocentric) vertical crustal motion at tide gauges within a semi-enclosed sea. As an illustration, we combine TOPEX/POSEIDON altimetry data (1992–2001) and 25 long-term (>40 years) tide gauge records around the Baltic Sea region of Fennoscandia, an area where crustal deformation is dominated by glacial isostatic adjustment (GIA). A comparison of the estimated vertical motion, at 1–11 mm/yr, with independent solutions from 10 collocated BIFROST GPS sites, shows a difference of 0.2 ± 0.9 mm/yr, thus verifying the accuracy and robustness of the procedure. The solution uncertainty is estimated at 0.4 mm/yr, which is significantly lower than previous analyses of this type. We conclude that our technique can potentially provide accurate vertical motion observations globally where long-term tide gauge records exist.

Received 18 November 2003; accepted 8 December 2003; published 14 January 2004.

Index Terms: 1206 Geodesy and Gravity: Crustal movements—interplate (8155); 1294 Geodesy and Gravity: Instruments and techniques; 4556 Oceanography: Physical: Sea level variations.

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Citation: Kuo, C. Y., C. K. Shum, A. Braun, and J. X. Mitrovica (2004), Vertical crustal motion determined by satellite altimetry and tide gauge data in Fennoscandia, Geophys. Res. Lett., 31, L01608, doi:10.1029/2003GL019106.