DAVIS STRAIT AND LABRADOR SEA 



41 



The remaining 1928 maps for the 200-, 400-, and 600-meter levels 

 (figs. 17-19) are particularly instructive in tracing the areas occu- 

 pied by Atlantic water off the southwest coast of Greenland at these 

 levels. Neither function alone, temperature nor salinity, can be 

 accepted for all depths to mark the boundary of this water. It was 



60 



60 50 



FIGURE 15. — Temperature at a depth of 100 meters July 30-September 3, 1928. 



warmest (6°) at the 100-meter level, but saltiest, 35.10%o, on the 

 200-meter plane. For the same salinity (35%o) for an increase 

 in draft from 100 meters to 400 meters the Irminger- Atlantic water 

 cooled approximately 1.5° C, on its under side. 



The areas enclosed by the critical isotherms and isohalines (figs. 

 17 to 19) indicate the manner in which the Atlantic water flows 



