been compiled. Physical oceanograpliic investigations of the Labra- 

 dor Sea-Baffin Bay areas have delineated the oceanic circulation to 

 some extent, but bcinir somewhat lackino- in detail, further investiga- 

 tions should be made. Information is available today on the meteoro- 

 logical conditions of this area, and somewhat spai-se climatological 

 data are also available. The U.S. Xaval Oceanographic Office ice pro- 

 gram data, acquired mainly by aerial reconnaissance, and their ice 

 forecasting provide a suitable insight into climatological conditions of 

 this area, particularly as it applies for our purposes, to iceberg en- 

 vironmental conditions. The aerial berg surveys commenced by the 

 U.S. Coast Guard in 1962 will eventually provide berg distribution 

 data that can better be correlated with meteorological and climatologi- 

 cal conditions and permit l^etter forecasting of expected berg distri- 

 bution on the Grand Banks. It is also expected to keynote the areas 

 and data that must be investigated more thoroughly to obtain quanti- 

 tative teclmiques. It now appears, though somewhat tenuously, that 

 berg reconnaissance of key northern areas during December and Jan- 

 uary will provide the berg distribution data required. It is considered 

 important to continue the northern surveys, until sufficient data has 

 been compiled. 



PRESEASON 1965 NORTHERN ICEBERG SURVEYS 



The first 1965 preseason northern berg survey was conducted during 

 21-23 October 1964. For the first time, ice conditions were determined 

 along the entire route of bergs from the northwest Greenland glaciers 

 to the Grand Banks. The next northern berg survey was conducted 

 6-8 December 1964 from Argentia, Newfoundland to Cape Christian, 

 Baffinland. Refer to Bulletin No. 50 (Season of 1964) for details of 

 the data on berg size and distribution and on the basic discussions and 

 assumptions in the correlation on berg size and distribution during 

 northern surveys to the number of bergs drifting south of latitude 

 48° N. 



On the basis of the 6-8 December survey and basic assumptions, 135 

 bergs were forecast to drift south of latitude 48° N. during the 1965 

 ice season provided normal climatology- had prevailed; with unfavor- 

 able conditions, only 75 bergs were to be expected. Conditions un- 

 favorable to berg drift and retention prevailed and 76 bergs drifted 

 south of latitude 48° N. Refer to the section on March and April ice 

 conditions in this Bulletin for a brief discussion on these factors. 



POSTSEASON 1965 NORTHERN AERIAL ICEBERG SURVEYS 



The nortliei-n aerial surveys can be grouped into monthly aerial sur- 

 veys from Newfoundland to Cape Chidley, Labrador, and the several 

 northern berg census flights of western Baffin Bay. Figures 2 through 



27 



