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Satellite-derived interannual ocean bottom pressure variability and its relation to sea level

Piecuch, C.G.; Quinn, K.J.; Ponte, R.M.

Geophysical Research Letters 40(12): 3106-3110

2013

ISSN/ISBN: 0094-8276
DOI: 10.1002/grl.50549
Accession: 036894488
Knowledge of the relationship between bottom pressure pb and sea level ? is important for understanding ocean circulation and climate. We use recent Gravity Recovery and Climate Experiment (GRACE) Release-05 data along with altimetry toinvestigate the relationship between ? and pb over long periods (> 1?yr) and large scales (> 750?km). Elevated pb signals are observed over deep extratropical regions (e.g., Southern Ocean basins) and shallow or semi-enclosed areas (e.g., Indonesian and Nordic seas). In these places, considerable ? variance is explained by pb variance. Correlation between ? and pb is significant in many regions, including instances of significant negative correlation suggestive of active baroclinic processes. exemplify the good quality of GRACE Release-05 data and demonstrate that contemporary regional ? variability cannot always be interpreted in terms of steric changes alone.

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