EXPLORATIONS, WESTERN ATLANTIC, STEAMER BACHE, 1914. 53 



tho ocean density at any given latitude is at least no higher in 

 summer than in winter; probably lower, because of solar warming, 

 there being no reason to expect any great change in salinity out- 

 side the zone influenced by the coast. If this be true, there is the 

 same dynamic tendency for the mixed water at the 50-150 meter 

 level, over the slope off Chesapeake Bay, to sink in summer as in 



Meter 



42 



Stations 



43 „ 44 



33 



45 46 



Fig. 52.— Salinity profile across the continental shelf off Chesapeake Bay, January, 1916 {Roosevelt stations 



8442, 8443, 8444, 8445, 8446). 



winter, because the densities are practically the same there for the 

 two seasons {Bache station 10158; Grampus station 10176, Bigelow, 

 1915, p. 345) except on the immediate surface, where the water was so 

 light in summer that it must have been floating out over the ocean 

 water offshore (Bigelow, 1915). And summer densities were almost 

 precisely the same, at the same relative position, off Delaware Bay 

 (Bigelow, 1915, station 10171) as off Chesapeake Bay, in 1913 (fig. 53). 



