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AOD1B RL05 reduces GRACE KBRR residuals related to rapid mass re-distribution; It explains up to 10 cm2 (40%) of high-frequency ENVISAT sea level variance; AOD1B RL05 was already applied in the latest GRACE reprocessing. published online: 30 JUL 2013
DDC:
550 - Earth sciences
Abstract:
An improved version of the OMCT ocean model with 1° spatial resolution provides bottom pressure anomalies for the new release 05 of the GRACE Atmosphere and Ocean De-aliasing Level 1B (AOD1B) product. For high-frequency signals with periods below 30 days, this model explains up to 10 cm2 of the residual sea level variance seen by ENVISAT in large parts of the Southern Ocean, corresponding to about 40% of the observed sea level residuals in many open ocean regions away from the tropics. Comparable amounts of variance are also explained by AOD1B RL05 for co-located in situ ocean bottom pressure recorders. Although secular trends contained in AOD1B RL05 cause GRACE KBRR residuals to increase in shallow water regions, we find a reduction of those residuals over all open ocean areas, indicating that AOD1B RL05 is much better suited to remove non-tidal high-frequency mass variability from satellite gravity observations than previous versions of AOD1B.
