. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 598 JOURNAL OF PHYSICAL OCEANOGRAPHY 88° 86° 84° 82° Volume 6. 88° 86° 84° 82° Fig. 3. As in Fig. 1, except for the interval C, 8 to 22 August, 1971. 80e decrease in eddy size, with no resolvable eddies found at the Yucatan Strait. The migrations of the 460 to 520 m band show the temporal changes which occur in the main current. The only significant temporal variability occurs in the southern basin where the large eddy initially centered at 17°30'N,
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 598 JOURNAL OF PHYSICAL OCEANOGRAPHY 88° 86° 84° 82° Volume 6. 88° 86° 84° 82° Fig. 3. As in Fig. 1, except for the interval C, 8 to 22 August, 1971. 80e decrease in eddy size, with no resolvable eddies found at the Yucatan Strait. The migrations of the 460 to 520 m band show the temporal changes which occur in the main current. The only significant temporal variability occurs in the southern basin where the large eddy initially centered at 17°30'N, 86°W (Fig. 1) apparently drifts to the west. There is no significant movement of the band at the Yucatan Strait during the six-week time period. 3. Drifter data The technique for reducing the drifter data was described by Molinari (1973) and Molinari and Kirwan (1975). This procedure provides geographic positions every 2h. The individual drogue trajectories are shown in Fig. 4. Four sets of trajectories were obtained, and with at least three drifters being deployed in each set. Legs 1 and 2 employed the same buoys which drifted un- attended from points 4 to 5 during an emergency port call. The buoys were retrieved at the end of leg 2, and redeployed in an unsuccessful attempt to sample the cyclonic flank of the current (leg 3). After a schedulep port call leg 4 was initiated, and then prematurely terminated when a storm threatened the operations area. The results of the drifter analysis are presented below in increasing order of the derivatives of the buoy coordinate-vs-time functions, , trajectories, speeds and accelerations. Finally, the ageostrophic components of the flow, as evaluated from the drifter data, are discussed. a. Trajectories Trajectories are computed for the center of mass of the buoy triads, and are given in Figs. 1-3. The current fields inferred from these trajectories are very similar to the circulation fields inferred from the 10°C topog- ra
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