Altimeter Data Analysis of the Antarctic Circumpolar Current
57
front, localized between 38°S and 46°S. A high variability area extends to at least
65°S, where altimeter data are no longer reliable because of the presence of sea ice.
Figure 4 shows two maps of SLV computed for the 2 years (1992-1993 and 19931994) separately. The two pictures are very similar; both show the same areas of
high and low variability. This could agréé with the fact that the bottom topography plays an important rôle in the variability’s development.
The maps of SLV show very good similarity with the map previously presented by Chelton et al. [ 11 ], based on Geosat data. This is consistent with the idea that
Fig. 4. As Figure 3 but a) SLV for the first year and b) for the second year
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