42N 



+ 



+ 

 55W 



+ 

 47W 



+ 

 39W 



Figure C- 1 3. Trajectory of Buoy 4511. 



BUOY 4511 



Buoy 4511 (Figure C-13. C-14) 

 was deployed twice in 1987, the 

 second time to collect operational 

 data. On 17 May (137) it was de- 

 ployed at 43-1 3N, 47-43W by 

 USCGC BITTERSWEET (WLB 

 389). It provided 37 days of op- 

 erational data Jn the Ice Patrol 

 operations area, before passing 

 east of 39°W on 22 June (1 73). 

 Due to a data formatting error, no 

 data regarding drogue status was 

 received from the ARGOS 



processing center after 15 June 

 (166). The earlier data indicate 

 that the drogue was attached until 

 that time. Buoy 451 1 continued 

 to transmit data throughout the 

 remainder of 1 987 as it moved 

 eastward across the Atlantic 

 Ocean. 



Buoy 451 1 was deployed south of 

 the eddy surveyed by BITTER- 

 SWEET. This shipboard deploy- 

 ment provided an opportunity to 

 compare the sea surface tem- 

 perature as determined by the 



buoy and a CTD (conductivity, 

 temperature, and depth) meas- 

 urement made at the depth of the 

 buoy's temperature sensor. The 

 agreement was excellent. The 

 buoy measured 1 6.3-1 6.4°C while 

 the CTD measurement was 

 16.4°C. The two measurements 

 were taken approximately 15 

 minutes apart. 



After its deployment, 451 1 moved 

 persistently and rapidly to the 

 northeast, with speeds, at times, 

 exceeding 150 cm/s. During the 



85 



