TY - JOUR

T1 - Gravity Changes in the Fennoscandian Uplift Area to be Observed by GRACE and Absolute Gravimetry

AU - Müller, J.

AU - Timmen, L.

AU - Gitlein, O.

AU - Denker, H.

PY - 2005/9

Y1 - 2005/9

N2 - Gravity changes due to the glacial isostatic adjustment in Fennoscandia entails a temporal geoid variation of about 3 mm and a gravity change of about 10 μGal over five years (linear trend) in the centre of the land uplift area. This gravity change can be observed by absolute gravimetry with an accuracy of lb 1 - 2 μGal and by GRACE with a geoid accuracy at the few mm level for long wavelengths. Since 2003, annual absolute gravity measurements have been intensified to improve the knowledge about the land uplift, about its accuracy and its spatial structure. Independently, relative gravimetry, tide gauge observations and GPS measurements are carried out by various institutions in dedicated campaigns or during their routine work. All Nordic countries contribute in different ways to the project (preparation of the sites, campaigns, collection of auxiliary data, computations and analyses). The main result of the project will be reduced point-wise gravity observations, which are combined with GPS height observations to derive an independent, spatially and temporally smoothed model of the geoid change. It can be compared with the land uplift determined from the GRACE data, i.e., gound-truth for the satellite measurements.

AB - Gravity changes due to the glacial isostatic adjustment in Fennoscandia entails a temporal geoid variation of about 3 mm and a gravity change of about 10 μGal over five years (linear trend) in the centre of the land uplift area. This gravity change can be observed by absolute gravimetry with an accuracy of lb 1 - 2 μGal and by GRACE with a geoid accuracy at the few mm level for long wavelengths. Since 2003, annual absolute gravity measurements have been intensified to improve the knowledge about the land uplift, about its accuracy and its spatial structure. Independently, relative gravimetry, tide gauge observations and GPS measurements are carried out by various institutions in dedicated campaigns or during their routine work. All Nordic countries contribute in different ways to the project (preparation of the sites, campaigns, collection of auxiliary data, computations and analyses). The main result of the project will be reduced point-wise gravity observations, which are combined with GPS height observations to derive an independent, spatially and temporally smoothed model of the geoid change. It can be compared with the land uplift determined from the GRACE data, i.e., gound-truth for the satellite measurements.

KW - Absolute gravimetry

KW - GRACE

KW - Postglacial rebound

KW - Temporal gravity changes

UR - http://www.scopus.com/inward/record.url?scp=84897039611&partnerID=8YFLogxK

U2 - 10.1007/3-540-26932-0_53

DO - 10.1007/3-540-26932-0_53

M3 - Article

AN - SCOPUS:84897039611

VL - 129

SP - 304

EP - 309

JO - International Association of Geodesy Symposia

JF - International Association of Geodesy Symposia

SN - 0939-9585

ER -