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Impact of GOCE Level 1b data reprocessing on GOCE-only and combined gravity field models

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Abstract

The reprocessing of Gravity field and steady-state Ocean Circulation Explorer (GOCE) Level 1b gradiometer and star tracker data applying upgraded processing methods leads to improved gravity gradient and attitude products. The impact of these enhanced products on GOCE-only and combined GOCE+GRACE (Gravity Recovery and Climate Experiment) gravity field models is analyzed in detail, based on a two-months data period of Nov. and Dec. 2009, and applying a rigorous gravity field solution of full normal equations. Gravity field models that are based only on GOCE gradiometer data benefit most, especially in the low to medium degree range of the harmonic spectrum, but also for specific groups of harmonic coefficients around order 16 and its integer multiples, related to the satellite’s revolution frequency. However, due to the fact that also (near-)sectorial coefficients are significantly improved up to high degrees (which is caused mainly by an enhanced second derivative in Y direction of the gravitational potential — VYY), also combined gravity field models, including either GOCE orbit information or GRACE data, show improvements of more than 10% compared to the use of original gravity gradient data. Finally, the resulting gradiometry-only, GOCE-only and GOCE+GRACE global gravity field models have been externally validated by independent GPS/levelling observations in selected regions. In conclusion, it can be expected that several applications will benefit from the better quality of data and resulting GOCE and combined gravity field models.

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Authors and Affiliations

  1. TU München, Institute of Astronomical and Physical Geodesy (IAPG), Arcisstraße 21, 80333, Munich, Germany

    Roland Pail, Thomas Fecher, Michael Murböck, Moritz Rexer, Monika Stetter, Thomas Gruber & Claudia Stummer

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  1. Roland Pail
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  2. Thomas Fecher
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  6. Thomas Gruber
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  7. Claudia Stummer
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Correspondence to Roland Pail.

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Pail, R., Fecher, T., Murböck, M. et al. Impact of GOCE Level 1b data reprocessing on GOCE-only and combined gravity field models. Stud Geophys Geod 57, 155–173 (2013). https://doi.org/10.1007/s11200-012-1149-8

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  • DOI: https://doi.org/10.1007/s11200-012-1149-8

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