IIP stopped collecting data on 22 September 1983 due to its relocation to Groton, Connecticut. 



The movements of TADs #2618 and #2625 

 were not significantly affected by sea ice (con- 

 centrations were less than 4 tenths). TADs 

 #2618 and #2625 entered the IIP operation 

 region on 10 April (52 °N, 54°40'W) and 2 May 

 1983 (52°N, 53°03'W) respectively (Figure B-1). 

 Both TAD #2618 and #2625 moved in an 

 eastward direction at about 14 and 17 cm/sec 

 respectively until reaching about 51°46.8'N, 

 51 °17'W (point A, Figure B-1). They both passed 

 through this point less than eight hours apart. 

 Both TADs changed direction at this point. A 

 high pressure center dominated that area dur- 

 ing this time with winds of less than 10 knots 

 (~5 m/sec). The difference in their tracks after 

 P' •' A may be accounted for by the vast dif- 

 fer,. ce in size of the two icebergs. TAD #2618, 



which made the more pronounced turn after 

 Point A, was a large iceberg with a deep draft. It 

 could have "felt" the Labrador Current more 

 and been less influenced by the wind driven 

 surface current than the small iceberg with 

 TAD #2625 aboard. 



From a gross abnormality in the track of TAD 

 #2625 (an unexpected severe change of direc- 

 tion), it is strongly suspected that TAD #2625 

 fell off the iceberg about 2 June when a storm 

 system passed through the area. This storm 

 system probably caused the iceberg with TAD 

 #2625 aboard either to roll over or break up. The 

 large tabular iceberg with TAD #2618 aboard 

 appears to have weathered this storm but 

 sometime prior to 21 June, TAD #2618 probably 

 fell off. During the period 21-28 June, TAD 



52 



