Time Variable Gravity: Contributions of GOCE Satellite Data to Monthly and Bi-monthly GRACE Gravity Estimates

Rexer, Moritz; Pail, Roland; Fecher, Thomas; Meyer, Ulrich (2014). Time Variable Gravity: Contributions of GOCE Satellite Data to Monthly and Bi-monthly GRACE Gravity Estimates. In: Marti, Urs (ed.) Gravity, Geoid and Height Systems. International Association of Geodesy Symposia: Vol. 141 (pp. 35-40). Springer International Publishing 10.1007/978-3-319-10837-7_5

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A feasibility study by Pail et al. (Can GOCE help to improve temporal gravity field estimates? In: Ouwehand L (ed) Proceedings of the 4th International GOCE User Workshop, ESA Publication SP-696, 2011b) shows that GOCE (‘Gravity field and steady-state Ocean Circulation Explorer’) satellite gravity gradiometer (SGG) data in combination with GPS derived orbit data (satellite-to-satellite tracking: SST-hl) can be used to stabilize and reduce the striping pattern of a bi-monthly GRACE (‘Gravity Recovery and Climate Experiment’) gravity field estimate. In this study several monthly (and bi-monthly) combinations of GRACE with GOCE SGG and GOCE SST-hl data on the basis of normal equations are investigated. Our aim is to assess the role of the gradients (solely) in the combination and whether already one month of GOCE observations provides sufficient data for having an impact in the combination. The estimation of clean and stable monthly GOCE SGG normal equations at high resolution ( >  d/o 150) is found to be difficult, and the SGG component, solely, does not show significant added value to monthly and bi-monthly GRACE gravity fields. Comparisons of GRACE-only and combined monthly and bi-monthly solutions show that the striping pattern can only be reduced when using both GOCE observation types (SGG, SST-hl), and mainly between d/o 45 and 60.

Item Type:

Book Section (Book Chapter)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Meyer, Ulrich

Subjects:

500 Science > 520 Astronomy

ISSN:

978-3-319-10836-0

Series:

International Association of Geodesy Symposia

Publisher:

Springer International Publishing

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

22 Jun 2015 08:41

Last Modified:

05 Apr 2017 15:54

Publisher DOI:

10.1007/978-3-319-10837-7_5

BORIS DOI:

10.7892/boris.69657

URI:

https://boris.unibe.ch/id/eprint/69657

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