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GW in Ålesund and Hannover Statistics of a station determination

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1 GW in Ålesund and Hannover Statistics of a station determination
The IfE absolute gravimetry plans for 2006, 2007, 2008, and some additional considerations Ludger Timmen, Olga Gitlein, Jürgen Müller, Heiner Denker Contents: Our plans GW in Ålesund and Hannover Statistics of a station determination Remarks about station distribution and net improvements

2 Gravity field variations:
Our plans (as applied to DFG) “The Fennoscandian Land Uplift: a Test and Application Area for GRACE” Absolute gravity determination with FG5-220 in Fennoscandia in 2006: 15 stations in 2007: 15 stations in 2008: ~7 or 8 stations (incl. reference and comparison measurements) } Gravity field variations: gravity and geoid change caused by recent uplift in Fennoscandia (surface point and area information, models) 2008/2009: summing up and unifying of data sets (gravimetry and GPS height rates) joint IfE /(FGI, KMS/DNSC, LM, SK) gravimetry campaigns data exchange with partner institutes: consideration of earlier campaigns (e.g. Wilmes et al. 2004) and recent campaigns with other absolute meters (UMB, BKG, FGI, NOAA) BIFROST and latest GPS results

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4 reasonable record from the dipper: seasonal behaviour (low (!) water table in August), assuming a porosity of 5% of Aksla: 3 m water table change may cause up to 5 μGal.

5 Absolute Gravity Determinations:
r = 0.90, dg/dGW = 0.18 μGal/cm

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7 BIFROST: Scherneck et al. 2003


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