Figure 15. — Medium sized pinnacled drydoeli tyi)e iceberg observed 26-30 Sep- 

 tember 1966. 



conducted from Newfoundland to Cape Chidley, Labrador; refer to 

 Bulletin Xo. 51 of this series for the aerial l^erg surveys of western 

 Baffin Bay). A comparison of the latter flights for 1965 with prior 

 years had shown fewer and smaller bergs throughout the western 

 Baffin Bay-Labrador Sea. On the basis of this distribution and the 

 average berg size, a forecast was made that if abnormally favorable 

 conditions for southward berg drift and survival to the Grand Banks 

 prevailed, as many as 100 bergs would drift south of latitude 48° N., 

 if unfavorable conditions prevailed as few as 20 bergs would sundve. 

 Extremely unfavorable conditions prevailed and not one berg drifted 

 south of latitude 48° N. 



The following paragraphs are intended to explain the existing con- 

 ditions and the reasons for the high berg deterioration en route to the 

 Grand Banks. 



THE EFFECT OF SEA LEVEL ATMOSPHERIC PRESSURE DISTRIBUTION ON THE GRAND BANKS 



ICE SEASON 



The study of the effect of surface winds on the drift of bergs from 

 Baffin Bay to the Grand Banks provides an indication of the pressure 

 tendency, or increase or decrease, of the southerly rate of flow of bergs. 

 The northern aerial berg surveys provide the data on the distribution 



15 



