Evaluation of Release-05 GRACE time-variable gravity coefficients over the ocean

By D. Chambers, J. Bonin. 2012

185 citations recorded by the source corpus.

Abstract. 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.

Subfields: Astronomy and Astrophysics, Molecular Biology, Oceanography

View Paper: https://www.semanticscholar.org/paper/a52ad05e68c8fe7b0671fa330a1206a4bd834701

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Citations in the corpus

The Observed State of the Water Cycle in the Early Twenty-First Century (2015, methodology): “They were processed with standard corrections to account for the degree 2 and order 0 coefficients, geocenter motion, and glacial isostatic adjustment (Chambers and Schröter 2011; Chambers and Bonin 2012).”
High‐resolution CSR GRACE RL05 mascons (2016, methodology): “We perform regional and global comparison with the results from the spherical harmonic RL05 solutions from CSR postprocessed at GRACE Tellus [Swenson, 2012; Swenson and Wahr, 2006; Landerer and Swenson, 2012; Chambers, 2012; Chambers and Bonin, 2012; Chambers and Willis, 2010], RL05.”
Quantifying and reducing leakage errors in the JPL RL05M GRACE mascon solution (2016, background): “Furthermore, gain factors over the ocean are not considered as monthly ocean bottom pressure variations, especially in the deeper ocean, are mostly characterized by length scales larger than 500–1000 km on monthly and longer time scales [Chambers and Bonin, 2012].”