57° 56° 55° 54° 53° 52° 51 ° 50° 49° 48° 47° 46° 45° 44° 43° 42° 41 ° 40° 39' 



40^ 



1000M 



-52° 



- 51° 

 50° 



-49° 



- 48° 

 -47° 

 -46° 



45° 

 -44° 

 -43° 

 -42° 

 -41° 



n \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 



57° 56° 55° 54° 53° 52° 51 ° 50° 49° 48° 47° 46° 45° 44° 43° 42° 41 ° 40° 39° 



Figure 1 



International Ice Patrol's Operation Area showing bathymetry 

 of the Grand Banks of Newfoundland 



40' 



defined current along the Newfoundland 

 coast were not entered into the model. 



Table 2 compares the detected num- 

 ber of icebergs crossing 48°N for each month 

 of 1992 with the monthly mean number of 

 icebergs crossing 48°N from 1 983 - 1 991 , the 

 period during which IIP has been patrolling 

 with SLAR-equipped aircraft. During the 1 992 

 ice year, an estimated 876 icebergs drifted 

 south of 48°N; whereas, during 1991 approxi- 

 mately 1 ,974 icebergs drifted south of 48°N. 



Based on the historic iceberg counts of it's 

 entire 78 year history IIP defines those ice 

 years with less than 300 icebergs crossing 

 48°N as light ice years; those with 300 to 600 

 crossing 48°N as average; those with 600 to 

 900 crossing 48°N as heavy; and those with 

 more than 900 crossing 48°N as extreme. 

 Thus, 1 992 was a heavy year when compared 

 to the entire history but seems to be about 

 average for the SLAR years. 



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