At = 0.89° F 24 OBS 

 OCEAN WEATHER STATION 

 CHARLIE, SEPTEMBER I960 



At'=0.99° F 43 OBS 

 B. VARIOUS LOCATIONS, YEARS, AND MONTHS 

 NORTH OF THE NORTH ATLANTIC CURRENT 



C. COMBINED DATA OF A AND B 



FIGURE 26 FREQUENCY DISTRIBUTIONS OF DENSITY CHANGES IN THE 

 THERMOCLINE DUE TO SALINITY DIFFERENCES EXPRESSED 

 AS TEMPERATURE DIFFERENCES At' IN ° F 



general area were available. The k-3 observations are spread over several 

 years and all months, excluding those of winter, and extend over a 10-degree 

 square located immediately north of the Worth Atlantic Current. The result, 

 shown in Figure 26b, is in good agreement with the data at station CHARLIE 

 for September and more or less indicates the same salinity distribution 

 throughout the months of the seasonal thermocline. These data are combined 

 in Figure 26c. 



The mean of the combined data (At"' = 0.9^- F) must be the salinity 

 effect on the k(rj) curves in Figures 15 through 22. It is assumed that 

 this effect is incorporated in the stability indexes of these curves, so 

 that the stability index of the k(rj) curves not only represents the mean 

 temperature diff erence A"T, but also At', the mean equivalent temperature 

 difference which represents the mean salinity effect in the thermocline. 

 Thus, At is the summation of AT and At'. The value of At ' near station 

 CHARLIE and in other temperate areas of the North Atlantic seems to be 

 rather uniform and close to 1° F. If there is no salinity difference in 

 the thermocline, 1° F should be subtracted from the temperature difference 

 between the surface and 1+00 feet in order to obtain the correct value of 

 At. 



5^ 



