PHYSICAL OCEAN OGKAPH Y OF 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 
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 103C5) 
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 
