Hydrography of the Stream 



65 



position of the cold water in June, 1950. Fig. 40, from the same article, 

 shows the positions of the temperature inversions for the entire Multiple 

 Ship operation, by shaded areas. It is quite evident from the temperature 

 and salinity of this water that it does not come from depth, but must 

 originate from somewhere along the shelf near Cape Hatteras. Were this 

 filament of fresh water a permanent feature, the supply of fresh water 

 required to maintain it would be of the order of magnitude lO^m.^/sec, 



Fig. 40. Positions of temperature inversions along the inshore side of the 

 Gulf Stream, determined on the 1950 Multiple Ship Survey and shown by dark 

 areas. The areas of shelf and slope are indicated. The Gulf Stream current is 

 shown by arrows between the cui'ved solid line and the dotted line, which serve 

 to mark the left- and right-hand sides of the Stream. From Ford, Longard, 

 and Banks (1952, fig. 5). 



which could be supplied by river discharge along the coast. The very fact 

 that such a slender filament can preserve its integrity along at least 

 1200 miles of the Gulf Stream is an indication that small-scale turbulent 

 processes tending to transfer properties across the Stream in the upper 

 layer are inconsiderable. 



