Buoy 4540 



Buoy 4540 (Figure B-2) was 

 deployed at 1532Z on 15 April 

 (106) at 49-59N, 50-30W. It was 

 recovered by NORTH WIND 64 

 days later (17 June, 169). The 

 drogue sensor data indicated that 

 the drogue was attached during 

 the entire drift period. 



During the first 31 days of drift 

 (106-137), 4540 moved southeast- 

 ward and then eastward, approxi- 

 mately parallel to the 1000 m 

 isobath. Its speed along this path 

 varied substantially, from 2 to 40 

 cm/s. As shown in Figure B-2b, 

 the period of this variability is 

 roughly three days. 



On 16 May (137), 4540 started a 

 southward movement through 

 Flemish Pass, again following the 

 1000 m isobath. Again the 

 variability of the speed along the 

 path was substantial (4-30 cm/s). 

 On 31 May (152), 4540 reversed 

 its direction and moved northward 

 following the 1000 m isobath on 

 the eastern side (Flemish Cap 

 side) of the Pass. Again there 

 were wide variations in the speed 

 (1-22 cm/s). On 14 June (166) 

 there was another reversal in the 

 direction in movement, with the 

 buoy again moving southward. 



There was no evidence in the 

 4540's temperature to suggest 

 involvement with any significant 

 thermal features. The tempera- 

 ture increased slowly from -1 °C to 

 6°C over the first 42 days (0.2°/ 

 day) and remained stable thereaf- 

 ter. 



66 



B 



LjOY 45 

 1 S 8 B 



Q 



o 



0) 



CL 



Id 



cr 



18 

 IB 

 14 

 12 

 10 

 8 

 6 

 4 

 2 

 

 -2 



\m^ 



108 



n 1 1 1 1 1 1 1 1 1 1 II I II M I II 1 1 n 1 1 1 1 1 1 1 1 1 1 I 1 1 1 1 1 I I I 11 1 1 



123 



138 



153 

 YEAR-DRY 



168 



80 

 80 



01 

 \ 



o 



Q. 



o 

 u 



I 



-40 

 -60 

 -80 



108 



1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I 1 



123 



38 



153 

 YERR-DRY 



168 



80 

 60 



-60 - 



-80 



108 



1 1 I 1 1 I I M Ill Ill 1 1 I I I I I 1 1 I I I I 1 1 n 



123 



138 



153 

 YERR-DRY 



168 



Figure B-2a. Time history of sea surface temperature, U, and V 

 velocity components (filtered) for 4540. 



