138 



MARION AND GENERAL GREENE EXPEDITIONS 



are based are contained in the United States Coast Guard Ice Patrol 

 Bulletins, 1922-36. In the earlier part of the period when the sub- 

 surface observations did not extend to 1,000 meters, resort has been 

 made to extrapolation. 



Smith (1931), in order to point out the paths along which icebergs 

 most frequently drift, grouped the above maps (appended to this 



FiGUEB 100. — Temperature-salinity correlation curves in the Grand Banks sector the spring 



of 1934 



chapter) into several characteristic types of circulation in the Grand 

 Banks sector as follows : ^- 



(a) A swelling of the Labrador Current in the Grand Banks 

 sector is often accompanied by an extension of its terminus as far 

 west as the fifty-third meridian. At such times it may hug closely 



" The agreement between the Isobaths shown on the dynamic topographic maps and the 

 actual iceberg drifts has been confirmed by the Ice Patrol and reported by Smith (1931). 



