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The IfE absolute gravimetry campaigns 2003, 2004, 2005: an epilogue

The IfE absolute gravimetry campaigns 2003, 2004, 2005: an epilogue. Olga Gitlein, Ludger Timmen. Absolute gravity station distribution. Station occupations by IfE in 2003 – 2005 . 25 different stations. Comparison of 2004 and 2005 results. Absolute gravity difference 2005 – 2004.

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The IfE absolute gravimetry campaigns 2003, 2004, 2005: an epilogue

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  1. The IfE absolute gravimetry campaigns 2003, 2004, 2005: an epilogue Olga Gitlein, Ludger Timmen

  2. Absolute gravity station distribution

  3. Station occupations by IfE in 2003 – 2005 25 different stations

  4. Comparison of 2004 and 2005 results Absolute gravity difference 2005 – 2004 • differences due to: • Uplift signal • measurement uncertainty • Local and regional groundwater • residual air mass effect • Soil moisture • Wind driven sea and ocean water flow Absolute gravity results in 2005 are less than in 2004 at nearly all 13 stations.

  5. Instrumental precision • gravity difference at ~120 cm sensor height from absolute and relative gravity measurements between two pillars at Metsähovi, Onsala and Bad Homburg Onsala ±1…±2 µGal • several setups to minimize the instumental uncertainties (Floor-recoil, azimuth (Coriolis/attrition), setup,…)

  6. 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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