ranged from 2°C to 1 2°C dur- 

 ing this period. Buoy speeds 

 increased form 5 cm/s to 54 

 cm/s during the next 9 days as 

 the buoy continued to drift to- 

 ward the east. Buoy 9882 

 continued to slowly drift east- 

 ward over Flemish Cap at 

 speeds ranging from 9 cm/s to 

 30 cm/s. Temperatures var- 

 ied from 10°C to 15°C. As 

 buoy 9882 continued to drift 

 toward the east, it completed 

 one cyclonic gyre (days 275 

 to 287) and then finally de- 

 parted the International Ice 

 Patrol operations area on day 

 292. Buoy speeds and sea 

 surface temperatures were 25 

 cm/s to 60 cm/s and 1 2°C to 

 15°C respectively. 



SUMMARY AND 

 CONCLUSIONS 



The performance 

 of the ten operational buoys 

 deployed during the 1990 sea- 

 son was adequate for IIP use. 

 The average number of days 

 a buoy remained deployed 

 within the IIP area was 104. 

 Buoy 4561 remained within 

 the IIP operations area pro- 

 viding information for 221 

 days. 



Most of the 1990 

 buoy trajectories followed one 

 of two general flow patterns. 

 Buoys drifting within the 

 1 00-m contourpassedthrough 



Flemish Pass under the 

 influence of the Labrador 

 Current. The North Atlantic 

 Current would then drift the 

 buoy to the northeast. The 

 buoy trajectories of Buoys 

 4542, 4561, 4530, and 9878 

 were indicative of this flow 

 pattern. Buoys deployed off- 

 shore of the 1000-m contour 

 drifted to the north of Flemish 

 Cap. The trajectories of 

 Buoys 11831, 11832, 9881, 

 and 9882 were indicative of 

 this flow pattern. Buoys 9877 

 and 11830 remained in the 

 general area in which they 

 were deployed as long as they 

 were transmitting data. 



REFERENCES 



FENCO, 1987. Optimum Deployment of TOD's 

 (TIROS Ocean Drifters) to Derive Ocean Currents for 

 Iceberg Drift Forecasting. Final Report Submitted by 

 FENCO Newfoundland, Ltd. to Meteorological Ser- 

 vices Research Branch, Atmospheric Environment 

 Service, 4905 Dufferin Street, Downsview, Ontario, 

 Canada M3H 5T4. 



Summy, A. D. and I. Anderson, 1983. Operational 

 Use of TIROS Oceanographic Drifters by International 

 Ice Patrol (1978-1982). Proceedings of the 1983 

 Symposium on Buoy Technology. Marine Technology 

 Society, 1825K Street, N.W., Suite 203, Washington, 

 D.C. 20593, pp. 246-250. 



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