AIUB-RL02: an improved time-series of monthly gravity fields from GRACE data

Meyer, Ulrich; Jäggi, Adrian; Jean, Yoomin; Beutler, Gerhard (2016). AIUB-RL02: an improved time-series of monthly gravity fields from GRACE data. Geophysical journal international, 205(2), pp. 1196-1207. Blackwell Science 10.1093/gji/ggw081

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The new release AIUB-RL02 of monthly gravity models from GRACE GPS and K-Band range-rate data is based on reprocessed satellite orbits referring to the reference frame IGb08. The release is consistent with the IERS2010 conventions. Improvements with respect to its predecessor AIUB-RL01 include the use of reprocessed (RL02) GRACE observations, new atmosphere and ocean dealiasing products (RL05), an upgraded ocean tide model (EOT11A), and the interpolation of shallow ocean tides (admittances). The stochastic parametrization of AIUB-RL02 was adapted to include daily accelerometer scale factors, which drastically reduces spurious signal at the 161 day period in C20 and at other low degree and order gravity field coefficients. Moreover, the correlation between the noise in the monthly gravity models and solar activity is considerably reduced in the new release. The signal and the noise content of the new AIUB-RL02 monthly gravity fields are studied and calibrated errors are derived from their non-secular and non-seasonal variability. The short-period time-variable signal over the oceans, mostly representing noise, is reduced by 50% with respect to AIUB-RL01. Compared to the official GFZ-RL05a and CSR-RL05 monthly models, the AIUB-RL02 stands out by its low noise at high degrees, a fact emerging from the estimation of seasonal variations for selected river basins and of mass trends in polar regions. Two versions of the monthly AIUB-RL02 gravity models, with spherical harmonics resolution of degree and order 60 and 90, respectively, are available for the time period from March 2003 to March 2014 at the International Center for Global Earth Models (ICGEM) or from ftp://ftp.unibe.ch/aiub/GRAVITY/GRACE

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science
08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Meyer, Ulrich; Jäggi, Adrian; Jean, Yoomin and Beutler, Gerhard

Subjects:

500 Science > 520 Astronomy

ISSN:

0956-540X

Publisher:

Blackwell Science

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

08 Aug 2016 11:24

Last Modified:

08 Aug 2016 11:24

Publisher DOI:

10.1093/gji/ggw081

BORIS DOI:

10.7892/boris.85124

URI:

https://boris.unibe.ch/id/eprint/85124

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