F/gure C- 1 7. Trajectory of Buoy 4553 



approximately one-half of the 

 100-day period, detaching on 12 

 August (224). 



Buoy 4553's southeastward 

 motion after deployment almost 

 exactly traces the 1000 m isobath 

 down to 46°N, including the 

 movement southward through 

 Flemish Pass. While moving 

 southward through Flemish Pass, 

 4553 recorded a 5.2°C increase 

 in temperature over a 21 -day 

 period (-.25 deg/day). During 

 this period the buoy's speed 

 varied from near zero to 30 cm/s. 



It is also during this period that 

 the drogue sensor showed 

 drogue detachment. The detach- 

 ment of the drogue added no 

 noise to the position record, as 

 might be expected due to wind 

 effects on the above-water 

 portion of the buoy hull. 



On 15 August (227) at approxi- 

 mately 46°N, 4553 began an 

 eastward motion south of Flemish 

 Cap. During the next 1 days the 

 temperature continued to in- 

 crease until it reached at)out 15°C 



on 25 August (237), while the 

 buoy moved persistently east- 

 ward at 15-35 cm/s. At this point 

 the temperature leveled off and 

 remained within 2°C of 15°C for 

 the remainder of the drift period in 

 the Ice Patrol operations area. At 

 the same time, 25 August (237), 

 the buoy's movement changed 

 substantially. Figure C-1 8 shows 

 that on this date 4553 entered a 

 region east of Flemish Cap where 

 the flow was vigorous, apparently 

 dominated by eddies and mean- 

 ders of the North Atlantic Current. 



89 



