57W 55 50 45 40 J9W 

 52N-J — .y / I 1 1 1 1—' — I 1 1 1— H 1 1 1 1 1 1 1 sjN 



50 



40N 



-■ 50 



4S42b«4S42a \ 



4 5 ■ ■'..-,:■:--::■, 



4557- 



132 





M 



^'} ]>192 



162 



• 15 



57W 



55 



50 



45 



— I— 

 40 3qw 



4 ON 



Figure B-1b Drift trajectories of 



by 2°C and 4557 was apparently 

 caught in the North Atlantic 

 Current and drifted towards the 

 northeast at 45 cm/s. On 1 4 July 

 (195), 4557 was picked up by an 

 unknown vessel. The drogue 

 sensor indicated the drogue was 

 attached throughout its deploy- 

 ment. 



4549 



Buoy 4549 was deployed from an 

 HC-130 north of the Grand Banks 

 on 16 May (136) in position 

 48°25.0'N 49°29.3'W (Figure B- 

 1a). It moved southward following 

 the bathymetry at an average 

 speed of 42 cm/s until it encoun- 

 tered an oceanic front on 29 May 

 (149). The average speed of 

 drifter 4549 increased to 65 cm/s 

 as it travelled along the front. On 

 4 June (155), drifter 4549 began a 



48 



buoys 4542 and 4557, marked with Julian dates. 



4552 



small cyclonic loop. The average 

 speed of drifter 4549 during the 

 loop was 31 cm/s. On 13 June 

 (164), it accelerated to an average 

 of 96 cnVs and began a large 

 cyclonic loop. This motion contin- 

 ued until 16 June (167). There 

 was an increase from 7°C to 9°C 

 when the motion stopped. The 

 large cyclonic loop coincided 

 temporally and spatially with the 

 cyclonic eddy observed along the 

 track of drifter 4557. Drifter 4549 

 moved to the north at an average 

 speed of 30 cm/s until 19 June 

 (170). It then accelerated to an 

 average speed of 74 cm/s and 

 drifted northeasterly, departing the 

 Ice Patrol region on 27 June (178). 

 The drogue sensor indicated the 

 drogue was attached throughout 

 its drift in the Ice Patrol region. As 

 of 30 September 1986, the buoy 

 was still transmitting. 



Buoy 4552 was deployed from an 

 HC-130 north of the Grand Banks 

 on 30 May 1986 (150) in position 

 48°10.0'N 48°55.0"W (Figure fl- 

 ic). It drifted south with the 

 Labrador Current approximately 

 following the bathymetry at an 

 average speed of 40 cm/s until 15 

 June (166). It then nearly re- 

 versed direction and drifted in a 

 northerly direction at about 25 

 cm/suntil27 June (178). No data 

 were received after 27 June. 

 There is no evidence in the data to 

 suggest the reversal of direction 

 was caused by the buoy being 

 picked up by a vessel. The 

 temperature sensor did not 

 provide reliable data throughout 

 the deployment. The drogue 

 sensor indicated the drogue was 

 attached throughout period 



\ 



