Present rate of uplift in Fennoscandia from GRACE and absolute gravimetry

authored by: Holger Steffen, Olga Gitlein, Heiner Denker, Jürgen Müller, Ludger Timmen
Abstract: Fennoscandia is a key region for studying effects of glacial isostatic adjustment. The associated mass variations can be detected by the Gravity Recovery and Climate Experiment (GRACE) satellite mission, which observes the Earth's gravity field since April 2002, as well as by absolute gravimetry field campaigns. Since 2003, annual absolute gravity (AG) measurements have been performed in Fennoscandia by the Institut für Erdmessung (IfE, Institute of Geodesy) of the Leibniz Universität Hannover, Germany, within a multi-national cooperation. This offers a unique opportunity for validation and evaluation of the GRACE results. In this preliminary study, the GRACE results are compared to secular gravity changes based on the surveys from 2004 to 2007 with the FG5-220 gravimeter of the IfE. The results from GRACE monthly solutions provided by different analysis centres show temporal gravity variations in Fennoscandia. The included secular variations are in good agreement with former studies. The uplift centre is located west of the Bothnian Bay, the whole uplift area comprises Northern Europe. Nevertheless, the differences between the GRACE solutions are larger than expected and the different centre-specific processing techniques have a very strong effect on possible interpretations of GRACE results. The comparison of GRACE to the AG measurements reveals that the determined trends fit well with results from GRACE at selected stations, especially for the solution provided by the GFZ. Variations of land hydrology clearly influence results from GRACE and the AG measurements.
Organisation(s): Institute of Geodesy
Type: Article
Journal: TECTONOPHYSICS
Volume: 474
Pages: 69-77
No. of pages: 9
ISSN: 0040-1951
Publication date: 21.01.2009
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Geophysics, Earth-Surface Processes
Electronic version(s): https://doi.org/10.1016/j.tecto.2009.01.012 (Access: Unknown)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{32e7fc8a195c4943ab66c3137e961c00,
title = "Present rate of uplift in Fennoscandia from GRACE and absolute gravimetry",
abstract = "Fennoscandia is a key region for studying effects of glacial isostatic adjustment. The associated mass variations can be detected by the Gravity Recovery and Climate Experiment (GRACE) satellite mission, which observes the Earth's gravity field since April 2002, as well as by absolute gravimetry field campaigns. Since 2003, annual absolute gravity (AG) measurements have been performed in Fennoscandia by the Institut f{\"u}r Erdmessung (IfE, Institute of Geodesy) of the Leibniz Universit{\"a}t Hannover, Germany, within a multi-national cooperation. This offers a unique opportunity for validation and evaluation of the GRACE results. In this preliminary study, the GRACE results are compared to secular gravity changes based on the surveys from 2004 to 2007 with the FG5-220 gravimeter of the IfE. The results from GRACE monthly solutions provided by different analysis centres show temporal gravity variations in Fennoscandia. The included secular variations are in good agreement with former studies. The uplift centre is located west of the Bothnian Bay, the whole uplift area comprises Northern Europe. Nevertheless, the differences between the GRACE solutions are larger than expected and the different centre-specific processing techniques have a very strong effect on possible interpretations of GRACE results. The comparison of GRACE to the AG measurements reveals that the determined trends fit well with results from GRACE at selected stations, especially for the solution provided by the GFZ. Variations of land hydrology clearly influence results from GRACE and the AG measurements.",
keywords = "Absolute gravimetry, Fennoscandia, Glacial isostatic adjustment, GRACE, Post-glacial rebound, Uplift",
author = "Holger Steffen and Olga Gitlein and Heiner Denker and J{\"u}rgen M{\"u}ller and Ludger Timmen",
note = "Funding information: We would like to thank the GRACE science team and the working group for Geodynamics of the Nordic Geodetic Commission (NKG), which serves as a platform to organise and realise the AG project in Fennoscandia, for the overall support. Besides IfE from Hannover, the following institutions are participating in the AG measurements project: Finnish Geodetic Institute (FGI, Masala/Finland), Department of Mathematical Sciences and Technology, University of Environmental and Life Sciences (UMB, {\AA}s/Norway), Bundesamt f{\"u}r Kartographie und Geod{\"a}sie (BKG, Frankfurt/Germany), Onsala Space Observatory (Chalmers University of Technology, Onsala/Sweden), Statens Kartverk (SK, H{\o}nefoss/Norway), Lantm{\"a}teriet (LM, G{\"a}vle/Sweden), National Space Institute, Technical University of Denmark (Copenhagen/Denmark). Many thanks also go to Roland Schmidt, Christoph Dahle (GFZ Potsdam), and Wouter van der Wal (University of Calgary) for helpful discussions. We are grateful for numerous comments and suggestions by two anonymous referees. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through research grants MU1141/8-1 (SPP 1257) and MU1141/3-1, 3-2, 3-3.",
year = "2009",
month = jan,
day = "21",
doi = "10.1016/j.tecto.2009.01.012",
language = "English",
volume = "474",
pages = "69--77",
journal = "TECTONOPHYSICS",
issn = "0040-1951",
publisher = "Elsevier",
number = "1-2",
}