Evaluation of high-frequency oceanographic signal in GRACE data: Implications for de-aliasing

Physics

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Geodesy And Gravity: Time Variable Gravity (7223, 7230), Geodesy And Gravity: Ocean Monitoring With Geodetic Techniques (1225, 1641, 3010, 4532, 4556, 4560, 6959), Geodesy And Gravity: Satellite Geodesy: Technical Issues (6994, 7969), Oceanography: Physical: Sea Level: Variations And Mean (1222, 1225, 1641)

Scientific paper

The sub-monthly portion of a recent daily-resolution GRACE data set (ITG-Grace2010) is evaluated over the ocean by comparing with the high-frequency component of sea level variability measured by satellite altimetry. The current Atmosphere and Ocean De-aliasing (AOD) model used to remove the high-frequency non-tidal ocean mass variations in GRACE data processing is also assessed. We demonstrate that the OMCT-based AOD model does not adequately represent the true sub-monthly variability in non-tidal ocean mass variability, but that ITG-Grace2010 does. The differences are not small, and indicate that a new model, or a data set derived from sub-monthly GRACE information, should be considered for de-aliasing in future GRACE processing.

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