Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results

J. M. Johansson, J. L. Davis, H. G. Scherneck, G. A. Milne, M. Vermeer, J. X. Mitrovica, Richard A Bennett, B. Jonsson, G. Elgered, P. Elósegui, H. Koivula, M. Poutanen, B. O. Rönnäng, I. I. Shapiro

Research output: Contribution to journalArticle

154 Citations (Scopus)

Abstract

Project BIFROST (Baseline Inferences for Fennoscandian Rebound Observations, Sea-level, and Tectonics) combines networks of continously operating GPS receivers in Sweden and Finland to measure ongoing crustal deformation due to glacial isostatic adjustment (GIA). We present an analysis of data collected between August 1993 and May 2000. We compare the GPS determinations of three-dimensional crustal motion to predictions calculated using the high-resolution Fennoscandian deglaciation model recently proposed by Lambeck et al. [1998a, 1998b]. We find that the maximum observed uplift rate (∼10 mm yr-1) and the maximum predicted uplift rate agree to better than 1 mm yr-1. The patterns of uplift also agree quite well, although significant systematic differences are evident. The root-mean-square residual rate for a linear error model yields estimates of rate accuracy of 0.4 mm yr-1 for east, 0.3 mm yr-1 for north, and 1.3 mm yr-1 for up; these figures incorporate model errors, however. We have also compared the values for the observed radial deformation rates to those based on sea level rates from Baltic tide gauges. The observational error for the vertical GPS rates required to give a reduced X2 of unity is 0.8 mm yr-1. The time series do exhibit temporal variations at seasonal frequencies, as well as apparent low-frequency noise. An empirical orthogonal function analysis indicates that the temporal variations are highly correlated among the sites. The correlation appears to be regional and falls off only slightly with distance. Some of this correlated noise is associated with snow accumulation on the antennas or, for those antennas with radomes, on the radomes. This problem has caused us to modify the radomes used several times, leading to one of our more significant sources of uncertainty.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Space Physics
Volume107
Issue number8
StatePublished - Aug 10 2002
Externally publishedYes

Fingerprint

Radomes
Postglacial
Global positioning system
GPS
adjusting
Sea level
radomes
Tide gages
Antennas
Orthogonal functions
Tectonics
Snow
uplift
sea level
Time series
antenna
temporal variation
antennas
orthogonal functions
Finland

Keywords

  • Glacial isostacy Space geodesy
  • Sea level change
  • Vertical motion

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Johansson, J. M., Davis, J. L., Scherneck, H. G., Milne, G. A., Vermeer, M., Mitrovica, J. X., ... Shapiro, I. I. (2002). Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results. Journal of Geophysical Research: Space Physics, 107(8).

Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results. / Johansson, J. M.; Davis, J. L.; Scherneck, H. G.; Milne, G. A.; Vermeer, M.; Mitrovica, J. X.; Bennett, Richard A; Jonsson, B.; Elgered, G.; Elósegui, P.; Koivula, H.; Poutanen, M.; Rönnäng, B. O.; Shapiro, I. I.

In: Journal of Geophysical Research: Space Physics, Vol. 107, No. 8, 10.08.2002.

Research output: Contribution to journalArticle

Johansson, JM, Davis, JL, Scherneck, HG, Milne, GA, Vermeer, M, Mitrovica, JX, Bennett, RA, Jonsson, B, Elgered, G, Elósegui, P, Koivula, H, Poutanen, M, Rönnäng, BO & Shapiro, II 2002, 'Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results', Journal of Geophysical Research: Space Physics, vol. 107, no. 8.
Johansson JM, Davis JL, Scherneck HG, Milne GA, Vermeer M, Mitrovica JX et al. Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results. Journal of Geophysical Research: Space Physics. 2002 Aug 10;107(8).
Johansson, J. M. ; Davis, J. L. ; Scherneck, H. G. ; Milne, G. A. ; Vermeer, M. ; Mitrovica, J. X. ; Bennett, Richard A ; Jonsson, B. ; Elgered, G. ; Elósegui, P. ; Koivula, H. ; Poutanen, M. ; Rönnäng, B. O. ; Shapiro, I. I. / Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results. In: Journal of Geophysical Research: Space Physics. 2002 ; Vol. 107, No. 8.
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