cold core ( < 2°C) eddy in this location. The average 

 speed in the eddy was 11 cm /sec. 



Drifter 2593 and 2594 were deployed on 28 April 

 1981. Drifter 2593 was deployed in the Labrador 

 Current at position 49°00'N, 49°56'W but was only 

 operational for seven days before it malfunctioned 

 and stopped transmitting. During the brief period 

 that it did transmit, it moved in an anticyclonic 

 direction. Drifter 2594 was deployed about 25 

 nautical miles to the west of Drifter 2593 on the 

 western side of the Labrador Current. It moved in 

 a generally easterly direction until it entered the 

 Labrador Current and then traveled southeasterly 

 between the 200 and 500 meter contours at about 

 27 cm/ sec. As the drifter traveled south of 48°N 

 latitude, it circled clockwise around an underwater 

 knoll and then continued south generally between 

 the 500 and 1000 meter contours at an average 

 speed of about 28 cm /sec. Sea surface tempera- 

 tures above 48°N latitude ranged from about 0.5 to 

 3.0°C. As the drifter moved south, it recorded 



temperatures from about 3.0 to 7.5°C at the 

 southern limit of its drift when it was caught up in 

 the northeasterly drift of the North Atlantic Cur- 

 rent. Southwest of Flemish Cap, the drifter was 

 caught up in a meander of the North Atlantic Cur- 

 rent which was very similar to the path taken by 

 drifter 2630 which was deployed during the 1980 

 Ice Patrol season. (See Ice Patrol Bulletin No. 35.) 

 The trajectories of the TODs deployed during the 

 1981 season show that much of the current pattern 

 in the area was bathymetrically controlled. The 

 flow of the Labrador Current was along the con- 

 tinental slope. As the current approached Flemish 

 Pass, part of the flow went north of Flemish Cap 

 parallel to the 1000 meter contour. However, if the 

 drifter was far enough north, it stayed north of 

 Flemish Cap. The anticyclonic circulation around 

 Flemish Cap also followed the bottom bathymetry. 

 The cold core eddy off of the Avalon Peninsula was 

 a new and interesting feature which should be 

 studied in the future. 



TABLE A-1 



SUMMARY OF TOD DEPLOYMENTS- 



-1981 SEASON 



A-2 



