PHYSICAL OCEANOGRAPHY OP THE GULF OF MAINE 



623 



tidal mixings; but a temperature gradient of this type would result from active 

 stirring of the upper stratum, if there be little interchange of water between the 

 latter and the deep strata. In Cape Cod Bay, where partial inclosure and shoal 

 water make local warming more effective than in any other part of the gulf, this 

 state is probably typical of midsummer, judging from the state of the upper 14 



Stations 



Met 



Fig. 64.— Temperature profile running southward from Mount Desert to the basin for August, from the 

 data for the years 1913, 1914, and 1915, combined (stations 10099, 10248, 10249, and 10305) 



meters of water there (18.3° to 17.9°) on August 24, 1922 (station 10644 and 10645, 

 p. 995). The fact that the superficial stratum of water warmer than 12° was con- 

 siderably thicker near Cape Cod than in the center of the bay that August corrobo- 

 rates the station data for May and June, 1925, to the effect that Cape Cod Bay is an 

 important center of production of warm water during the summer months. Had 

 the profile been run a few miles farther west, water warmer than 18° probably 



