Time-variable gravity signal in Greenland revealed by high-low satellite-to-satellite tracking

Weigelt, Matthias; van Dam, Tonie; Jäggi, Adrian; Prange, Lars; Tourian, Mohammad J.; Keller, Wolfgang; Sneeuw, Nico (2013). Time-variable gravity signal in Greenland revealed by high-low satellite-to-satellite tracking. Journal of Geophysical Research: Solid Earth, 118(7), pp. 3848-3859. American Geophysical Union 10.1002/jgrb.50283

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[1] In the event of a termination of the Gravity Recovery and Climate Experiment (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 Challenging Minisatellite Payload (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.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Jäggi, Adrian and Prange, Lars

Subjects:

500 Science > 520 Astronomy

ISSN:

2169-9356

Publisher:

American Geophysical Union

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

19 Jun 2014 09:57

Last Modified:

05 Apr 2017 15:54

Publisher DOI:

10.1002/jgrb.50283

BORIS DOI:

10.7892/boris.45850

URI:

https://boris.unibe.ch/id/eprint/45850

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