rapidly south and occupied the entire time of the Patrol until it 

 melted on July 7. (See figs. IT and 18.) On Jnly 8 the Patrol 

 scouted the critical area and the cold water as far as latitude 47°20' 

 N. sighting no ice and the Ice Patrol was terminated on July 9. 

 The Patrol was stopped, not because of a cessation of the Labrador 

 Current, but because the ice supply gave out. 



A. detailed account of the operations of the patrol vessels Avill be 

 found elsewhere in this volume under Cruise Reports. Figures 10 

 to 18 show the track of the patrol vessel, the ice conditions, and the 

 average thermal distribution of the surface water during the par- 

 ticular cruise. 



In discussing the problems of the Ice Patrol it was mentioned that 

 in attempting to forecast the annual variations in the number of ice- 

 bergs south of Newfoundland use had been made of winter weather 

 conditions along the Labrador coast and in the Baffin Bay region. 

 A high correlation has been found, which is thoroughly discussed 

 b}' Smith in Bulletin No. 19, part III, 1931, but the problem does not 

 seem entirely solved. The Mariott expedition in 1928 threw mucli 

 light on the general ocean circulation in the Labrador Sea and Davis 

 Strait and it was hoped that subsequent observations at key stations 

 in the same territory might lead to further knowledge of the ice and 

 its movements. To this end post-season oceanographic cruises have 

 been made in 1931, 1933, 1934, and the present season, 1935. Each 

 year of such cruises, certain designated sections across tlie Labrador 

 Current, the Irminger Current and the East Greenland Current are 

 repeated. From these data are calculated the heat-balance or heat- 

 transfer between the Atlantic Ocean and Baffin Bay via the Labra- 

 dor Sea and Davis Strait. It is hoped to correlate any marked 

 changes in the general temperature conditions in this basin with the 

 annual variations in the number of bergs drifting south of New- 

 foundland. A detailed description of the scientific program carried 

 out during this year's post-season cruise will be found under Ocean- 

 ography (p. 83) in this volume and a narrative account of the opera- 

 tions of the oceanographic vessel under Cruise Reports (p. 41). 



ICE CONDITIONS, NORTH ATLANTIC, IN VICINITY OF THE GRAND 



BANKS,. 1935 



AUGUST 1934 



During August, 13 bergs were reported in the vicinity of the Grand 

 Banks in widely scattered positions. (See figure 3.) All these bergs 

 were north of 47°40', and were drifting eastward and eastnortheast 

 with the North Atlantic Drift. During this period, the eastern- 

 most berg was in latitude 47°40' N., longitude 44°45' W. This was 

 also the southernmost berff. 



