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The IfE absolute gravimetry campaigns 2003, 2004, 2005: an epilogue Olga Gitlein, Ludger Timmen
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epochIfEtotal different FG5’s institutions 200316228BKG, FGI, IfE 200416244FGI, IfE, UMB 200513304FGI, IfE, UMB 2003- 2005 2534 Absolute gravity station distribution
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StationGPS200320042005total Ålesundx1 Andøyax1 Ås1 Bodø1 Hønefoss AC1 Tromsøx1 Trondheimx1 Trysil ACx1 Cophg./Budd.x1 Cophg./Vestv.3 Bornholmx1 Helsingør2 StationGPS200320042005total Arjeplogx3 Boråsx1 Kirunax2 Kramfors3 Mårtsbox2 Onsalax3 Östersundx3 Skellefteåx3 Visby AAx2 Metsähovix 5 Sodankyläx1 Vaasa AA1 Vaasa ABx3 ∑ 16 1347 Station occupations by IfE in 2003 – 2005 25 different stations
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differences due to: Uplift signal measurement uncertainty Local and regional groundwater residual air mass effect Soil moisture Wind driven sea and ocean water flow [µGal] MINMAXMEANRMS -4.21.8-0.8±1.9 Comparison of 2004 and 2005 results Absolute gravity results in 2005 are less than in 2004 at nearly all 13 stations. Absolute gravity difference 2005 – 2004
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gravity difference at ~120 cm sensor height from absolute and relative gravity measurements between two pillars at Metsähovi, Onsala and Bad Homburg Instrumental precision Metsähovi AB-AC Onsala AS-AN Bad Homburg BA-AA dg(rel) ±0.5 µGal 1.97.734.9 Difference dg(abs) – dg(rel) [µGal] 1.91.4-2.6 -1.61.1 0.1 2.7 1.7 1.9 0.2 Onsala ±1…±2 µGal several setups to minimize the instumental uncertainties (Floor-recoil, azimuth (Coriolis/attrition), setup,…)
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Summary of IfE campaigns 2003 – 2005 25 different stations occupied by IfE accuracy for one station determination ±2…±4 µGal several FG5 setups per station relative gravimetry:vertical gradients (<±1 µGal) eccentres (national net points) monitoring of lokal water level (groundwater, lakes) monitoring of height changes of absolute gravity point levelling to height benchmarks at nearly all stations continuous GPS available connection to tide gauges
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