Observing Fennoscandian Gravity Change by Absolute Gravimetry

authored by: L. Timmen, O. Gitlein, J. Müller, H. Denker, J. Mäkinen, M. Bilker, B. R. Pettersen, D. I. Lysaker, O. C.D. Omang, J. G.G. Svendsen, H. Wilmes, R. Falk, A. Reinhold, W. Hoppe, H. G. Scherneck, B. Engen, B. G. Harsson, A. Engfeldt, M. Lilje, G. Strykowski, R. Forsberg
Abstract: The Nordic countries Norway, Sweden, Denmark and Finland are a key study region for the research of glacial isostasy, and, in addition, it offers a unique opportunity for validating and testing the results of the GRACE experiment. Over a period of five years, the expected life time of GRACE, a temporal geoid variation of 3.0 mm is expected in the centre of the Fennoscandian land uplift area, corresponding to a gravity change of about 100 nm/s². This is expected to be within the detection capabilities of GRACE. With terrestrial absolute gravimetry, the gravity change due to the land uplift can be observed with an accuracy of ±10 to 20 nm/s² for a 5-year period. Thus, the terrestrial insitu observations (ground-truth) may be used to validate and test the GRACE results. Since 2003, absolute gravity measurements have been performed in Fennoscandia at about 30 stations covering Norway, Sweden, Finland and Denmark. Four groups with FG5 absolute gravimeters (BKG, FGI, IfE, UMB) are engaged to survey the uplift network annually by a mutually controlled procedure. Nearly all absolute stations are colocated with permanent GPS stations. From the 2003 and 2004 comparisons between the instruments, an overall accuracy of ±30 nm/s² is indicated for a single absolute gravimeter and a single station determination. This is in full agreement with the project goal.
Organisation(s): Institute of Geodesy
External Organisation(s): Norwegian University of Life Sciences
Federal Agency for Cartography and Geodesy (BKG)
Chalmers University of Technology
Statens Kartverk (Norwegian Mapping Authority)
Lantmäteriet - The Swedish Mapping, Cadastral, and Land Registration Authority
KMS (National Survey and Cadastre)
Finnish Geodetic Institute (FGI)
Type: Conference contribution
Pages: 193-199
No. of pages: 7
Publication date: 2006
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Computers in Earth Sciences, Geophysics
Electronic version(s): https://doi.org/10.1007/978-3-540-38596-7_23 (Access: Unknown)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{46854f5edc2f4388879d19aedcd8b079,
title = "Observing Fennoscandian Gravity Change by Absolute Gravimetry",
abstract = "The Nordic countries Norway, Sweden, Denmark and Finland are a key study region for the research of glacial isostasy, and, in addition, it offers a unique opportunity for validating and testing the results of the GRACE experiment. Over a period of five years, the expected life time of GRACE, a temporal geoid variation of 3.0 mm is expected in the centre of the Fennoscandian land uplift area, corresponding to a gravity change of about 100 nm/s2. This is expected to be within the detection capabilities of GRACE. With terrestrial absolute gravimetry, the gravity change due to the land uplift can be observed with an accuracy of ±10 to 20 nm/s2 for a 5-year period. Thus, the terrestrial insitu observations (ground-truth) may be used to validate and test the GRACE results. Since 2003, absolute gravity measurements have been performed in Fennoscandia at about 30 stations covering Norway, Sweden, Finland and Denmark. Four groups with FG5 absolute gravimeters (BKG, FGI, IfE, UMB) are engaged to survey the uplift network annually by a mutually controlled procedure. Nearly all absolute stations are colocated with permanent GPS stations. From the 2003 and 2004 comparisons between the instruments, an overall accuracy of ±30 nm/s2 is indicated for a single absolute gravimeter and a single station determination. This is in full agreement with the project goal.",
keywords = "Absolute gravimetry, Fennoscandian land uplift, geoid change, glacial isostatic adjustment (GIA), GRACE validation, postglacial rebound (PGR)",
author = "L. Timmen and O. Gitlein and J. M{\"u}ller and H. Denker and J. M{\"a}kinen and M. Bilker and Pettersen, {B. R.} and Lysaker, {D. I.} and Omang, {O. C.D.} and Svendsen, {J. G.G.} and H. Wilmes and R. Falk and A. Reinhold and W. Hoppe and Scherneck, {H. G.} and B. Engen and Harsson, {B. G.} and A. Engfeldt and M. Lilje and G. Strykowski and R. Forsberg",
year = "2006",
doi = "10.1007/978-3-540-38596-7_23",
language = "English",
isbn = "9783540385950",
series = "International Association of Geodesy Symposia",
publisher = "Springer Verlag",
pages = "193--199",
booktitle = "Geodetic Deformation Monitoring",
address = "Germany",
note = "International Symposium on Geodetic Deformation Monitoring ; Conference date: 17-03-2005 Through 19-03-2005",
}