30 EXPLOEATIONS^ WESTERN ATLANTIC, STEAMER BACHE, 19M. 



at 200 meters, below which level there is a rapid decrease of salinity 

 to 34.85Voo at 800 meters in the center of the channel, and to 35.5*'/oo 

 at 700 meters off Gun Cay. 



At all three stations along this line the vertical coohng was rapid, 

 the temperature dropping off Cape Florida from 21° to 10.5° in a 



Salinity; %o 

 34.9 35 .1 .2 .3 .4 .5 .6 .7 .8 .9 36 .1 .2 .3 .4 .5 .6 .7 



Meter 



100 

 200 

 300 

 400 

 500 

 600 

 700 



Fig. 27.— Salinity sections on the Gun Cay-Cape Florida line; stations 10202, 10203, 10204. 



distance of 50 meters; from 24° on the surface to 6° at 800 meters 

 in the center of the channel; from 23° to 12° in 700 meters off Gun 

 Cay. The temperature profile (fig. 28) shows no trace of the warm 

 tongue so conspicuous between Key West and Habana, and the 

 warmest water (24°-25°) was on the surface in the center of the 



Meter 



1000 



Fig. 28.— Temperature profile across the Straits of Florida, Gun Cay-Cape Florida. 



channel, instead of on the Bahaman side, besides being fractionally 

 cooler than the highest surface temperatures off Habana. The 

 banking up of water colder than 10° and fresher than 35%o 

 against Florida is even more pronounced than in the preceding 

 profile, water with these characteristics rising to within about 175 



