Figure B-2. Velocity 

 distributions for International Ice 

 Patrol's 1984 TODs. TOD#4512's 

 velocity distribution is significantly 

 different from all otfiers because it 

 remained in the Labrador Current and 

 tfie Nortf) Atlantic Current for ttie 

 duration of its drift in the International 

 Ice Patrol area. 



signal was received from TOD 

 #451 4 afterthat date, but this 

 short drift illustrated much less 

 than the 49 cm/s average velocity 

 used by the historical current file 

 in this section of the Avaton 

 Channel. 



TOD #4531 was deployed about 

 11 km northwest of the northern 

 end of the Flemish Pass (48032'N 

 48O0rW)on13June(165). It 

 moved slowly (average velocity 

 1 2 cm/s) northward until 30 

 August (241). it then travelled 

 southward roughly paralleling its 

 northbound leg, about 8 km west 

 of the northbound leg, at 1 2 cm/s 

 until 1 8 September (262). After 

 this date, TOD #4531 drifted 

 east, then southeast at 29 cm/s 

 until 1 October (275). The 

 section of the drift after 1 8 

 September (262) was nearly 

 perpendicular to the historical 

 cun-ent field for that area. 



The next two TODs were 

 deployed from USCGC 

 HORNBEAM during the IIP 

 cruise. TOD #2633 was 

 deployed from USCGC 

 HORNBEAM during the IIP 

 cruise. TOD #2633 was 

 deployed on 6 Ju ly ( 1 88) at 

 hydrographic station #23 in 

 position 48O20'N48°30'W. It 

 drifted eastward over the top of 

 the Flemish Cap and roughly 

 followed the bathymetry south on 

 the eastern side of the Cap until 

 28 August (241). It then began 

 drifting northward at an average 

 velocity of 39 cm/s in the North 

 Atlantic Current. As of 1 October 

 (275), TOD #2633 appeared to 

 be caught in the circulation of an 



d 



V 

 0. 



4511 

 4509 

 4510 



1 — I — I — I — I — I "^' ■ ■ i ■ n ■ ' I " I 



10 eO so 40 60 so 70 80 00 100 100-*- 



Velocity (cm/s) 



a 

 « 



o 



« 

 0. 



80-| 

 40- 



ao 

 eo 



10 -t 

 



/••■ \ 

 -I /••■ '^ 



/• 



X. 



4512 

 4514 

 4531 



\ 



-1 — I — I — I — \ — i—n — I — I — I — 1 



10 eo 90 40 60 60 70 80 00 100 lOO-i^ 



Velocity (cm/s) 



a 



V 



u 

 u 



V 



0. 



&0-| 

 40- 

 30- 

 80 



Jy 



r 





2633 

 2632 

 4528 

 4530 



■T^ 



1 — I — I — I — I — r'— 1 — \-^r 



10 80 30 40 60 80 70 80 00 100 100-^ 



Velocity (cm/s) 



anticyctonic (warm core eddy) 

 centered near 50O30'N 43O00'W. 

 TOD #2632 was deployed on 1 7 

 July (1 99) next to the iceberg 

 used in the drift and deterioration 

 experiment described below. 

 TOD #2632 drifted northeast and 

 then southeast roughly following 

 the bathymetry around the top of 

 Flemish Cap until 11 August 

 (224). TOD #2632 then drifted 

 northwest at about 1 9 cm/s until 5 

 September (249) and then drifted 

 southeast at 1 6 cm/s through the 

 same general area it had just 

 traversed. This drift helps 

 illustrate the large temporal 

 variability of the flow field in the 

 Grand Banks region. 



TOD #4528 was deployed on 5 

 August (218) in an area of high 

 iceberg concentration at 

 50059.4'N51001.2'W. It drifted 

 southward at an average velocity 

 of 1 5 cnVs until 1 7 August (230) . 

 It then apparently became caught 

 in a weak cyclonic eddy and 

 remained entrapped until 13 

 September (257). TOD #4528 

 continued drifting south at 1 2 

 cm/s until 1 October (275). The 

 southward velocities indicate that 

 TOD #4528 was not in the 

 Labrador Current, yet the METOC 

 SST charts indicate it should have 

 been on the westem edge 

 (Figure B-3). This suggests the 

 METOC SST charts alone cannot 

 always be used to identify the 

 location of the Labrador Cun-ent. 



56 



