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   Relative Gravity Measurement Campaign during the 7th International Comparison of Absolute Gravimeters (2005); ; Francis, Olivier  et alin Metrologia (2009), 46(3), 214 Since the 1st International Comparison of Absolute Gravimeters (ICAG) and accompanying Relative Gravity Campaign (RGC) held at the BIPM in 1981, repeated ICAG-RGCs have been organized every four years. A ... [more ▼] Since the 1st International Comparison of Absolute Gravimeters (ICAG) and accompanying Relative Gravity Campaign (RGC) held at the BIPM in 1981, repeated ICAG-RGCs have been organized every four years. A total of 19 absolute gravimeters (AG) and 15 relative gravimeters (RG) participated in the 7th ICAG-RGC, which took place in 2005. Co-located absolute and relative gravity measurements as well as precision levelling measurements were carried out. The final version of the absolute g values of the 7th ICAG has been officially released recently. This paper is the final report of the 7th RGC and replaces the preliminary results published earlier. It covers the organization of the RGC and the data processing, analyses RG behaviour, computes g , δ g and O AG (offset of AG) and discusses their uncertainties. In preparation for the BIPM key comparison ICAG-2009, a standard data-processing procedure has been developed and installed in the BIPM ICAG-RGC software package, GraviSoft. This was used for the final data processing. [less ▲] Detailed reference viewed: 134 (5 UL) Absolute gravity measurements at the Conrad Observatorium in Austria in June 2008Francis, Olivier Report (2008) Detailed reference viewed: 58 (1 UL)New Devlopments in Gravity Applications and Instruments; ; et al Scientific Conference (2008, January 14) Detailed reference viewed: 89 (2 UL)Geodetic measurements of postglacial adjustments in Greenland; ; et al in Journal of Geophysical Research (2008) We analyze data from seven continuous Global Positioning System (GPS) receivers and one tide gauge, all located along the edge of the Greenland ice sheet, to determine vertical uplift rates. We compare ... [more ▼] We analyze data from seven continuous Global Positioning System (GPS) receivers and one tide gauge, all located along the edge of the Greenland ice sheet, to determine vertical uplift rates. We compare our results with predictions based on the ICE-5G deglaciation model of Peltier (2004). Results from the GPS receiver at Kellyville (-1.2 ± 1.1 mm/a) and from the tide gauge at Nuuk (-2.2 ± 1.3 mm/a), indicate that ICE-5G overestimates the subsidence rates at those locations by 2.1 and 1.1 mm/a, respectively. Kellyville and Nuuk are located along the southwestern margin of the Greenland ice sheet, and the observed negative uplift rates are consistent with independent evidence that the ice margin along the southwestern edge readvanced during the last ~8 ka to its current position. The ICE-5G glaciation-deglaciation history includes a readvance between the latitudes of 62°N and 72°N. The GPS measurements suggest the ICE-5G readvance may be too large or mistimed. Our GPS results at Qaqortoq, located at the southern tip of Greenland, suggest a secular subsidence rate of 0.3 ± 1.1 mm/a, while ICE-5G predicts an uplift rate of 1.0 mm/a. ICE-5G assumes no ice sheet readvance in south Greenland, including no readvance of the Qassimiut lobe. The difference of 1.3 ± 1.1 mm/a can tentatively be explained as due to a ~33 km readvance of the Qassimiut lobe during the last ~3 ka. For the other GPS sites, the observed/predicted uplift rates are 3.6 ± 1.1/-0.1 mm/a at Thule, 0.0 ± 1.1/2.0 mm/a at Scoresbysund, and -0.4 ± 1.1/-1.7 mm/a at Kulusuk. For Thule, Kulusuk, and Scoresbysund the differences between the observed and predicted rates are on the order of 1.3 – 3.7 mm/a, though with opposite signs, and indicate that ICE-5G does not exactly reproduce the correct rebound signal at those locations. [less ▲] Detailed reference viewed: 173 (6 UL)Absolute Gravity Measurements at LNE; Francis, Olivier ; et alin Peshekhonov, Vladimir (Ed.) Proceedings of the International Symposium on Terrestrial Gravimetry: static and mobile measurements (2008) Detailed reference viewed: 100 (1 UL)Investigations of characteristics of gravimetric sites intended for high-accuracy measurements; ; et al in Peshekhonov, Vladimir (Ed.) Proceedings of the International Symposium on Terrestrial Gravimetry: static and mobile measurements (2008) Detailed reference viewed: 52 (2 UL)Absolute and Relative gravity Measurements in Qaqortoq (Greenland) in August 2007Francis, Olivier Report (2007) Detailed reference viewed: 71 (2 UL)Is the instrumental drift of superconducting gravimeters a linear or exponential function of time?; Francis, Olivier in Journal of Geodesy (2007), 81(5), 337-344 Detailed reference viewed: 140 (5 UL)Relative campaign during the International Comparison of Absolute Gravimeters ICAG-2005 and the strategy of data treatment combined with the absolute results; ; et al in Kilicoglu, Ali; Forsberg, Rene (Eds.) Gravity Field of the Earth: Proceedings of the 1st International Symposium of the International Gravity Field Service (2007) Detailed reference viewed: 60 (5 UL)Elastic uplift in southeast Greenland due to rapid ice mass lost; ; et al in Geophysical Research Letters (2007), 34(L21701), 1-6 The rapid unloading of ice from the southeastern sector of the Greenland ice sheet between 2001 and 2006 caused an elastic uplift of ~35 mm at a GPS site in Kulusuk. Most of the uplift results from ice ... [more ▼] The rapid unloading of ice from the southeastern sector of the Greenland ice sheet between 2001 and 2006 caused an elastic uplift of ~35 mm at a GPS site in Kulusuk. Most of the uplift results from ice dynamic-induced volume losses on two nearby outlet glaciers. Volume loss from Helheim Glacier, calculated from sequential digital elevation models, contributes about ~16 mm of the observed uplift, with an additional ~5 mm from volume loss of Kangerdlugssuaq Glacier. The remaining uplift signal is attributed to significant melt-induced ice volume loss from the ice sheet margin along the southeast coast between 62°N and 66°N. [less ▲] Detailed reference viewed: 108 (6 UL)The Seventh International Comparison of Absolute Gravimeters ICAG-2005 at the BIPM. Organization and Preliminary reseults; ; et al in Kilicoglu, Ali; Forsberg, Rene (Eds.) Gravity Field of the Earth: Proceedings of the 1st International Symposium of the International Gravity Field Service (2007) Detailed reference viewed: 62 (1 UL)Measurements of the acceleration due to gravity at the gravity laboratory of the National Institute of Metrological Research Turin (Italy); ; et al Report (2006) Detailed reference viewed: 107 (3 UL)Absolute and Relative Gravity Measurements at the Istituto Nazionale di Ricerca Metrologica (INRIM) of Turin (Italy) in June 2006Francis, Olivier Report (2006) Detailed reference viewed: 70 (1 UL)Absolute and Relative Gravity Measurements in Nuuk (Greenland ) in July 2005Francis, Olivier Report (2006) Detailed reference viewed: 85 (2 UL)Modelling the global ocean tides: modern insights from FES2004; ; et al in Ocean Dynamics (2006), 56(5-6), 394--415 Detailed reference viewed: 157 (2 UL)A geophysical interpretation of the secular displacement and gravity rates observed at Ny-Alesund, Svalbard in the Arctic - effects of the post-glacial rebound and present-day ice melting; ; et al in Geophysical Journal International (2006), 165(3), 729-743 Detailed reference viewed: 128 (0 UL)Set standard deviation, repeatability and offset of absolute gravimeter A10-008; Francis, Olivier in Metrologia (2006), 43(5), 414 Detailed reference viewed: 129 (2 UL)Gravity Tide and seasonal gravity variation at Ny-Alesund, Svalbard In Arctic; ; et al in Journal of Geodynamics (2006), 41(1-3), 234-241 Detailed reference viewed: 113 (0 UL)Analysis of results of the International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003Francis, Olivier ; van Dam, Tonie in Francis, Olivier; van Dam, Tonie (Eds.) International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003 (2006) Detailed reference viewed: 104 (2 UL)International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003Francis, Olivier ; van Dam, Tonie Book published by Centre Européen de Géodynamique et de Séismologie (2006) Detailed reference viewed: 65 (8 UL) |
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