part to indicate icebergs detected by IIP ra- 

 dar surveillance. 



Again this season, the study showed that HP's 

 melt model is very important as a tool for 

 maintenance of the LAKI. From Table 4, 69% 

 of the limit setters were deleted after reach- 

 ing 150% melt. Non-detection of icebergs 

 during reconnaissance patrols accounted for 

 31 % of the deletions, of the icebergs that com- 

 prised the LAKI. The reader is directed to the 

 IIP Organization and Procedures Manual 



Table 4 

 Deletion Method of LAKI Icebergs 



bergs which pass south of 52°N latitude or 

 are detected in the IIP operations area melt 

 before they ever approach near the LAKI. 



This season's study reinforced a finding of the 

 1 996 study, that approximately half of the limit 

 setting icebergs are detected by IIP reconnais- 

 sance. In 1996, 61% of the limit setting ice- 

 bergs were initially detected by IIP patrol flights 

 conducting reconnaissance patrols near the 

 limits. For the 1997 season, IIP patrols ac- 

 counted for 41% (Table 1) of the Initial 

 sightings of limit setting icebergs. Most of 

 these detections occurred near the LAKI, 

 which means these icebergs either make it 

 through the IIP operations area (from 52°N to 

 LAKI) undetected or are created in the region 

 near the LAKI. If the latter is considered, it 

 suggests that the splitting of icebergs Into 

 "pieces" as they journey south, and especially 

 in the vicinity of the LAKI, is an important pro- 

 cess of their deterioration. Regardless of how 

 they get there, the fact that these icebergs 

 are found a the LAKI gives Impetus for IIP to 

 remain vigilant in this region. 



(CIIPINST M5400.1) for the policies pertain- 

 ing to deletion of icebergs from the model. 



The results from this work have yielded a bet- 

 ter understanding of the contributing surveil- 

 lance sources and the final fates of the limit 

 setting icebergs. In the 1997 Season, 4839 

 icebergs (including reslghts) were entered in 

 the IIP iceberg drift models, of which 1 78 were 

 used to set the LAKI. For comparison, in the 

 1996 Season, 3902 icebergs were entered in 

 the IIP Iceberg drift model, of which 110 be- 

 came limit setters. Assuming data from these 

 two years are typical, the great majority of ice- 



44 



