. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 306 I O V R N A L O V 1* IIVS1CAL O C E A N O G K A PHY Volume 5 X-D1STANCE (KM) X- DISTANCE (KM) 400 «2f 440 450 4sr> 1 I buoy SYN'30L 2880 - 13/0030 „r"°° 1 „ cPo° ~°° 2 o • 2860 2940 o o ^•*" 13/2130 * E X AVERAGE u V, \D VECTOR trf 3£3 m/sec , 1 . i . 1 o —I A 2820 1 , 1 1 TIME 13/0530 13/2130. Fig. 7. As in Tig. 0 except for leg 2. differed by about 5 m from the height of the buoys. Assuming a logarithmic velocity profile one finds
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 306 I O V R N A L O V 1* IIVS1CAL O C E A N O G K A PHY Volume 5 X-D1STANCE (KM) X- DISTANCE (KM) 400 «2f 440 450 4sr> 1 I buoy SYN'30L 2880 - 13/0030 „r"°° 1 „ cPo° ~°° 2 o • 2860 2940 o o ^•*" 13/2130 * E X AVERAGE u V, \D VECTOR trf 3£3 m/sec , 1 . i . 1 o —I A 2820 1 , 1 1 TIME 13/0530 13/2130. Fig. 7. As in Tig. 0 except for leg 2. differed by about 5 m from the height of the buoys. Assuming a logarithmic velocity profile one finds that the velocity at the buoy is within 90% of that ob- served. Because the Virginia Key frequently was 10-20 km from some of the drifters and because the logarithmic profile indicated such a small difference, we elected not to make a height correction to the wind records. Fig. 5 gives the smoothed trajectories determined from the analysis. The rapid separation of the drogued and non-drogued drifters is evident in this figure. As expected, the non-drogued drifters had a larger down- wind displacement than did the drogued drifters. The separation between the two drogued drifters also \aries but to a lesser degree. The cause of this separation could be due to small-scale diffusive processes, hori- zontal inhomogeneity of the currents (discussed below), or the result of the dynamics of turning currents (Chew, 1974). Prifter type 1 has been tised by AOML in a numbei of previous experiments. Here this type was drogued at 30 m by a m parachute while the other types were not drogued. This disparity in coupling depths required a special assumption for analysis of the data, namely, that there was no current shear be- tween the surface and 30 m. Note from Table 2 that the type 1 drifters have a much smaller K than the other types. For the wind speeds encountered in this experiment, the maximum wind effect for type 1, as computed from (4), was only 4% of
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