Rhum in the Sea of The Herbides 

 off Scotland on 1 2 October 1985, 

 and TOD #4530 ran aground near 

 Helston, England (near Lands 

 End) on 28 August 1985 (Table C- 

 2). With the cooperation of the 

 Royal Navy and the Military Airlift 

 Command, TOD #4530 is being 

 retumed to Ice Patrol. 



1985 Iceberg Deterioration 

 Observations 



In 1983 International Ice Patrol 

 began using a computer model to 

 predict iceberg deterioration. 

 The model, based on White, et 

 al., 1 980, uses melting due to 

 insolation, vertical buoyant 

 convection, wind-forced 

 convection, and wave erosion to 

 reduce the length of each 

 iceberg. The details of the 

 equations used by IIP to model 

 these four processes can be 

 found in Anderson, 1983. 



During the EVERGREEN cruise, 

 measurements of the observed 

 icebergs were made using a 

 reticulated laser range finder. 

 Measurements were made twice a 

 day separated by 1 2 hours, 

 weather and other operations 

 permitting. Photographs of the 

 iceberg were taken in conjunction 

 with the measurements. Length 

 and mass estimates were made 

 from the measurements and 

 photographs. These methods 

 can lead to a large error in mass 

 estimation, since none of the 

 underside of the iceberg was 

 observed. Sea surface 

 temperature (SST), significant 

 wave height and period data were 

 also collected. The observed 

 environmental data were used as 

 the inputs for the deterioration 

 rTX)del in the discussions that 

 follow. In the operational use of 

 the nrodel, the required 

 environmental data is received 



50 

 Sep n-it.itey 



Figure C-3g. September 13-16, 1985 



Figure C-4. Iceberg #1, 19 April 1985, 0930Z. Est length,129 m. 



