TY - GEN

T1 - Observing Fennoscandian Gravity Change by Absolute Gravimetry

AU - Timmen, L.

AU - Gitlein, O.

AU - Müller, J.

AU - Denker, H.

AU - Mäkinen, J.

AU - Bilker, M.

AU - Pettersen, B. R.

AU - Lysaker, D. I.

AU - Omang, O. C.D.

AU - Svendsen, J. G.G.

AU - Wilmes, H.

AU - Falk, R.

AU - Reinhold, A.

AU - Hoppe, W.

AU - Scherneck, H. G.

AU - Engen, B.

AU - Harsson, B. G.

AU - Engfeldt, A.

AU - Lilje, M.

AU - Strykowski, G.

AU - Forsberg, R.

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

KW - Absolute gravimetry

KW - Fennoscandian land uplift

KW - geoid change

KW - glacial isostatic adjustment (GIA)

KW - GRACE validation

KW - postglacial rebound (PGR)

UR - http://www.scopus.com/inward/record.url?scp=84884341645&partnerID=8YFLogxK

U2 - https://doi.org/10.1007/978-3-540-38596-7_23

DO - https://doi.org/10.1007/978-3-540-38596-7_23

M3 - Conference contribution

AN - SCOPUS:84884341645

SN - 9783540385950

T3 - International Association of Geodesy Symposia

SP - 193

EP - 199

BT - Geodetic Deformation Monitoring

PB - Springer Verlag

T2 - International Symposium on Geodetic Deformation Monitoring

Y2 - 17 March 2005 through 19 March 2005

ER -