Labrador Current. The measure- 

 ments were made to a depth of 

 about 300m using T-4 expendable 

 BathyThermographs (XBT). 



Having only one observation 

 platform to monitor the drift and 

 deterioration of six icebergs, which 

 were within a circle of approxi- 

 mately 55km radius, made both 

 compiling environmental factors 

 affecting each iceberg and verify- 

 ing iceberg identity difficult. The 

 distance between the cutter and 

 each iceberg determined the 

 applicability of environmental 

 observations. Table E-2 summa- 

 rizes the distances between 

 observations and icebergs. The 

 average distance wave data were 

 collected from each iceberg was 

 48km; wind and weather data, 

 61km; and sea temperature data, 

 7km. These distances were 

 computed from the interpolated 

 positions of each iceberg for 

 OOOOZ and 1200Z as derived from 

 a cubic spline. 



The spatial separation of the wind 

 and wave observations is much 

 smaller than the 250km data grid- 

 spacing on which global environ- 

 mental products are prepared by 

 FLENUMOCEANCEN for IIP use 

 (COMNAVOCEANCOM, 1986). 

 Because the study area was at 

 least 105km offshore, the wind 

 and wave fields were assumed to 

 be spatially uniform. 



In mapping the sea surface 

 temperature, the icebergs were in 

 a tongue-like feature of cold water 

 which protruded southeastward. 

 The feature, which measured 

 about 1 8km across, complicated 

 the data analysis, since the 

 temperature field could not be 

 assumed uniform. As a compro- 

 mise, only observations within 



9km of an iceberg's position were 

 accepted. Because of this restric- 

 tion and having only one observa- 

 tion platform, the data sets for 

 some icebergs were incomplete. 

 The temperature values necessary 

 to model deterioration were 

 linearly interpolated from these 

 data sets. 



Table E-2: Distance of Observations from Individual Icebergs. 



115 



