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Comparisons of absolute gravimetry results Olga Gitlein, Ludger Timmen
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Conversion of gravity and height changes Example: Measured quantities: Geoid change:Change of gravity disturbance: gravity disturbance
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Absoluteepochepoch Stationdifference [µm/s 2 ] Metsähovi AB19-21. Aug 03 12-13. May 040,022 03-04 Jul 20040,053 Metsähovi AC18-19. Aug 2003 13-14 May 040,057 04-05. Jul 20040,045 Vaasa AB24-25. Aug 03 17-19 May 20040,056 Kramfors06-07. Sept 03 30.May-01.June 040,027 Östersund10-12. Sept 03 02-04 June 040,050 Skellefteå28-30.08.2003 06-09 June 040,052 Arjeplog01-03. Sept 03 11-12 June 040,042 Onsala AS13-14. Jun 03 26-28 Oct 20040,000 Copenhagen 05-06. Jun 03 Vestvolden 17-19. Oct 04-0,014 Comparison of 2003 and 2004 results Epoch differences due to: Uplift signal residual air mass effect measurement uncertainty Local and regional groundwater Soil moisture Wind driven sea and ocean water flow Improved reduction models Positive averaging effect due to annual measurements over 5 years Spatial averaging or smoothing effect over many stations
![Absoluteepochepoch Stationdifference [µm/s 2 ] Metsähovi AB19-21.](http://images.slideplayer.com./37/10734954/slides/slide_3.jpg "Aug May 040, Jul 20040,053 Metsähovi AC Aug May 040, Jul 20040,045 Vaasa AB Aug May 20040,056 Kramfors Sept May-01.June 040,027 Östersund Sept June 040,050 Skellefteå June 040,052 Arjeplog Sept June 040,042 Onsala AS Jun Oct 20040,000 Copenhagen Jun 03 Vestvolden Oct 04-0,014 Comparison of 2003 and 2004 results Epoch differences due to: Uplift signal residual air mass effect measurement uncertainty Local and regional groundwater Soil moisture Wind driven sea and ocean water flow Improved reduction models Positive averaging effect due to annual measurements over 5 years Spatial averaging or smoothing effect over many stations.")
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