HP's computer model consists of one 

 routine which predicts the drift of each iceberg 

 and another which predicts the deterioration 

 of each. The drift prediction program uses a 

 historical current file which is modified weekly 

 using satellite-tracked ocean drifting buoy data, 

 thus taking into account local, short-term, cur- 

 rent fluctuations. Murphy and Anderson (1985) 

 described and evaluated the IIP drift model. 



The IIP iceberg deterioration program 

 uses daily sea surface temperature and wave 

 height information from the U.S. Navy Fleet 

 Numerical Oceanography Center (FNOC) to 

 predict the melt of icebergs. Anderson (1 983) 

 and Hanson (1 987) described the IIP deterio- 

 ration model in detail. It is the combined ability 

 of the SLAR to detect icebergs in all weather 

 and MP's computer models to estimate iceberg 

 drift and deterioration which enables IIP to 

 schedule aerial iceberg surveys every other 

 week rather than every week. 



Six satellite-tracked ocean drifting 

 buoys were deployed to provide operational 

 data for MP's iceberg drift model. Five buoys 

 were the small drifting buoys which IIP evalu- 

 ated during the 1990 and 1991 IIP oceano- 

 graphiccnjises. One buoy was a World Ocean 

 Circulation Experiment (WOCE) drifter. The 

 WOCE buoy will be the standard used by IIP in 

 the upcoming years. All buoys were equipped 

 with temperature sensors and drogued at 50 

 meters. Drift data from the buoys are dis- 

 cussed in the IIP 1992 Drifting Buoy Atlas, 

 which is available upon request. 



Table 2 

 Number of Icebergs Detected 



Number of icebergs South of 



48°N during 1992 compared 



to the average for the period 



1983-91, the SLAR 



reconnaissance period. 



Avg 

 1983-91 1991-92 



OCT91 

 NOV 91 

 DEC 91 

 JAN 92 

 FEB 92 

 MAR 92 

 APR 92 

 MAY 92 

 JUN92 

 JUL 92 

 AUG 92 

 SEP 92 



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