. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography July 1976 NOTES AND CORRESPONDENCE 599 (Fig. 1), and the leg 4 trajectory parallels the phase 3 temperature field (Fig. 3). This result is consistent with the temporal variability observed in the tempera ture field and discussed above. Visual inspection of the trajectories in Fig. 4 indicates that large-amplitude meanders did not occur in the area. The largest curvature in the trajectories occurs in the anticyclonic turn indicated in the temperature
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography July 1976 NOTES AND CORRESPONDENCE 599 (Fig. 1), and the leg 4 trajectory parallels the phase 3 temperature field (Fig. 3). This result is consistent with the temporal variability observed in the tempera ture field and discussed above. Visual inspection of the trajectories in Fig. 4 indicates that large-amplitude meanders did not occur in the area. The largest curvature in the trajectories occurs in the anticyclonic turn indicated in the temperature fields at 19°30'N, 86°W (Figs. 1-3). The average anticyclonic radius of curvature from points 7 to 10 shown in Fig. 4 is 75 km. b. Speeds and accelerations Buoy speeds have been computed from the position data by using a centered difference approximation to the differential. The accelerations have been computed in natural coordinates, , downstream s, crossstream n (positive to the left of the downstream axis), and vertical z (positive up). The accelerations are tangential (dV/dt), centripetal (KV2) and Coriolis (fV), where d( )/dt = d( )/dt+Vd( ) ds, V is the measured speed, K the horizontal curvature (positive for downstream cyclonic turning), and / the Coriolis parameter. The trends in the individual buoy speeds have been determined by fitting in a least-squares sense a cubic polynomial in time to the speed values. The fitted polynomial trend has been subtracted from the observed values to arrive at residual speed curves. The speed and residual speed curves for each drifter, and the poly- nomial fit curve for one drifter, are given in Fig. 5. The large-scale accelerations inferred from the temperature data are apparent in the fitted polynomial curves. For instance, the temperature gradients of the anticyclonic turn centered at 19°30'N, 86°\V suggest a deceleration in the flow. This deceleration occurs at 206/1930 (Fig. 5), as the drifters enter this turn. The tempera
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