. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography July 1976 NOTES AND CORRESPONDENCE 597 90° 88° 86c 84°. 82° i 80° DEPTH OF THE 10°C ISOTHERM IN METERS 24 JULY TO 1 AUGUST CICAR SURVEY MONTH I 20 m CONTOUR INTERVAL TRAJECTORY %£ca 24° 22° 20° 90c 88° 86° 84° 82° Fig. 2. As in Fig. 1, except for the interval B, 24 July to 1 August, 1971. 18° 16° 80fl A two-ship operation was conducted in the summer of 1971 to investigate the formation of the Yucatan Current, and in particular to determine the natur
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography July 1976 NOTES AND CORRESPONDENCE 597 90° 88° 86c 84°. 82° i 80° DEPTH OF THE 10°C ISOTHERM IN METERS 24 JULY TO 1 AUGUST CICAR SURVEY MONTH I 20 m CONTOUR INTERVAL TRAJECTORY %£ca 24° 22° 20° 90c 88° 86° 84° 82° Fig. 2. As in Fig. 1, except for the interval B, 24 July to 1 August, 1971. 18° 16° 80fl A two-ship operation was conducted in the summer of 1971 to investigate the formation of the Yucatan Current, and in particular to determine the nature and extent of the ageostrophic component in the western Caribbean Sea (Fig. 1) where the Current forms. In this field study, the ageostrophic component of the flow was determined by measuring the acceleration of water parcels tagged by drift buoys. The surface buoy was described by Molinari (1973); nominally it senses the motion of the water at 40 m by a parachute drogue. Data reduction techniques, and the reduced surface drifter, temperature and salinity data collected by the NOAA ship Researcher were also discussed by Molinari (1973). These data, supplemented by additional temperature data collected by Discoverer (Hazelworth and Starr, 1975) are used in the following sections to describe the formation of the Yucatan Current in the summer of 1971. 2. Temperature-salinity data Certain isotherm topographies are useful surrogates for the density distribution in this area. In particular, Molinari (1975) found that the 10°C topography closely maps the geostrophic current regime in the western portion of the Caribbean Sea. The study period, 14 July to 22 August, 1971, is divided into three time intervals. The intervals are selected to provide spatial resolution of the temperature field over the shortest time span. Figs. 1-3 show the 10°C topographies during these intervals (identified as A, B, C). The 10°C topography at 83°\V (Fig. 1) has a slope at 18°N consi
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