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The exponential increase in the use of altimeter data in oceanographic studies in the pasttwo decades has improved the knowledge of the processes that govern the interactionbetween the ocean and the atmosphere. One of these processes is the response of theocean to atmospheric pressure variations, which has been deeply analysed in the past.That response is based on the isostatic assumption used to establish a standardcorrection for altimetric purposes, the Inverse Barometer Correction (IBC). As a generalrule, the ocean goes up/down 1cm when the atmospheric pressure goes down/up1mbar. However, in light of recent works in some oceanic regions, discrepancies arisewhen the real response is compared to the hypothetical one. It is important to quantifythis discrepancy, in order to improve the accuracy of the correction, which is one of themost significant geophysical corrections applied to altimeter records. Some aspects ofthis response remain unclear, such as the real space-temporal scales where IBC can beapplied, the influence of wind, non-isostatic atmospheric pressure-driven signals, andthe effect of aliasing from high frequency signals. This paper is an attempt to gaininsight into this phenomenon. The data used are the residuals obtained between seasurface heights from the ERS-2 altimeter and the outputs of a global barotropic oceanmodel. Significant departures from the hypothetical isostatic response in all data series(spatial and temporal domain) have been found, especially in the case of altimeterrecords. By applying the collinear track method, we observe that the estimated Atlantic Oceanresponse is quite similar to the one deduced from the isostatic assumption atall latitudinal bands. Nonetheless, the Indian and Pacific Oceans show importantdepartures from the hypothetical value at low latitudes. Results obtained with thecrossover track method show important deviations at low latitudes in the three basins. Inorder to understand why the Atlantic Ocean response is different from the one obtainedin the other two, we can infer some explanations based on the interaction of seasonaland intraseasonal signals with the isostatic one. Key words. Meteorology and atmospheric dynamics(ocean-atmosphere interactions). Oceanography: physical(sea level variations; remote sensing, instruments andtechniques

annales geophysicae

Evidence of different ocean responses to atmospheric pressurevariations in the Atlantic, Indian and Pacific Basins as deduced fromERS-2 altimetric data