reconnaissance patrols of the Ice Patrol air- 

 craft, reports from ships and aircraft, both 

 military and civilian, transitting the area, ice 

 reconnaissance flights by the U.S. Naval Ocean- 

 ographic Office along the Labrador Coast, and 

 ice reconnaissance flights by the Canadian De- 

 partment of Transport in the Gulf of St. Law- 

 rence, Newfoundland coastal waters, and along 

 the Labrador Coast. 



Some environmental factors that affect the 

 drift and deterioration are the wind, the cur- 

 rents (both density and wind driven), and the 

 temperature of the water. Charts of the weekly 



average surface pressure (a measure of both 

 the wind affect on the iceberg and the wind 

 driven ocean current) are arranged to face the 

 chart of observed ice conditions for that week. 

 Charts of the average sea temperature to 150 

 meters and the geostrophic (density) current, 

 obtained from Evergreen's oceanographic sur- 

 veys, and charts of the bi-weekly sea surface 

 temperature, obtained from ship reports, are 

 presented. For a detailed discussion of the 

 oceanography of this region during this year's 

 surveys, refer to the appropriate U.S. Coast 

 Guard Oceanographic Report (CG-373 series). 



15 



