ABSTRACT 



In support of International Ice Patrol, four cruises were conducted on 

 the Grand Banks of Newfoundland and the Labrador Sea during 1970 to 

 study ocean currents that affect the drift of icebergs. The dynamic topog- 

 raphy of the Labrador Current and its environs showed significant depar- 

 ture from normal, but there was general agreement between the dynamic 

 topographies relative to the 1000 and 3000 decibar surfaces. Variations at 

 standard section A3 were greater than those at standard section A2. Down- 

 welling was observed at standard section A3 at the same time the Labrador 

 Current showed a strong acceleration in calculated geostrophic velocity. 

 Direct current measurements on the continental shelf showed a strong tidal 

 influence. STD data from analog traces were compared with those from a 

 Digital Data Logger; significant differences were found. 



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