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Evaluation of high‐frequency oceanographic signal in GRACE data: Implications for de‐aliasing
Author(s) -
Bonin Jennifer A.,
Chambers Don P.
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl048881
Subject(s) - aliasing , altimeter , satellite , ocean tide , data set , climatology , environmental science , sea level , geology , geodesy , remote sensing , oceanography , meteorology , computer science , geography , mathematics , statistics , telecommunications , aerospace engineering , undersampling , engineering
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.