Reference : Time-variable gravity signal in Greenland revealed by high-low satellite-to-satellite...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Time-variable gravity signal in Greenland revealed by high-low satellite-to-satellite tracking
Weigelt, Matthias mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
van Dam, Tonie [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Jäggi, Adrian [University of Bern > Astronomical Institute]
Prange, Lars [University of Bern > Astronomical Institute]
Tourian, Mohammad J. [University of Stuttgart > Institute of Geodesy]
Keller, Wolfgang [University of Stuttgart > Institute of Geodesy]
Sneeuw, Nico [University of Stuttgart > Institute of Geodesy]
Journal of Geophysical Research. Solid Earth
American Geophysical Union (AGU)
Yes (verified by ORBilu)
[en] Time variable gravity ; CHAMP ; hl-SST ; Greenland
[en] In the event of a termination of the GRACE mission before the launch of GRACE Follow-On (due for launch in 2017) high-low satellite-to-satellite tracking (hl-SST) will be the only dedicated observing system with global coverage available to measure the time variable gravity field (TVG) on a monthly or even shorter time scale. Until recently, hl-SST TVG observations were of poor quality and hardly improved the performance of Satellite Laser Ranging observations. To date, they have been of only very limited usefulness to geophysical or environmental investigations. In this paper, we apply a thorough reprocessing strategy and a dedicated Kalman filter to CHAMP data to demonstrate that it is possible to derive the very long wavelength TVG features down to spatial scales of approximately 2000 km at the annual frequency and for multi-year trends. The results are validated against GRACE data and surface height changes from long-term GPS ground stations in Greenland. We find that the quality of the CHAMP solutions is sufficient to derive long-term trends and annual amplitudes of mass change over Greenland. We conclude that hl-SST is a viable source of information for TVG and can serve to some extent to bridge a possible gap between the end-of-life of GRACE and the availability of Grace Follow-On.
Researchers ; Professionals ; Students
Accepted for publication in Journal of Geophysical Research: Solid Earth. Copyright (2013) American Geophysical Union. Further reproduction or electronic distribution is not permitted.

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