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| Titel |
Evaluation of Release-05 GRACE time-variable gravity coefficients over the ocean |
| VerfasserIn |
D. P. Chambers, J. A. Bonin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 5 ; Nr. 8, no. 5 (2012-10-12), S.859-868 |
| Datensatznummer |
250005874
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| Publikation (Nr.) |
 copernicus.org/os-8-859-2012.pdf |
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| Zusammenfassung |
| The latest release of GRACE (Gravity Recovery and Climate Experiment) gravity
field coefficients (Release-05, or RL05) are evaluated for ocean
applications. Data have been processed using the current methodology for
Release-04 (RL04) coefficients, and have been compared to output from two
different ocean models. Results indicate that RL05 data from the three
Science Data Centers – the Center for Space Research (CSR),
GeoForschungsZentrum (GFZ), and Jet Propulsion Laboratory (JPL) – are more
consistent among themselves than the previous RL04 data. Moreover, the
variance of residuals with the output of an ocean model is 50–60% lower
for RL05 data than for RL04 data. A more optimized destriping algorithm is
also tested, which improves the results slightly. By comparing the GRACE maps
with two different ocean models, we can better estimate the uncertainty in
the RL05 maps. We find the standard error to be about 1 cm (equivalent water
thickness) in the low- and mid-latitudes, and between 1.5 and 2 cm in the
polar and subpolar oceans, which is comparable to estimated uncertainty for
the output from the ocean models. |
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