OCEAN TEMPERATURES 



385 



(133) computed on pages 376 to 378, (7 = 8.3, D = 5.6, \ = .004, 

 w^ = 31, y = 600, - = .237 and sinh - = .24 are used in 



a a 



table 8, which gives the relation of /\(A) (equation 135) to y. 



TABLE 8 

 The variation of /^(X) wni/i respect to y. 



Table 8 shows the variation of f 1 (\) with respect to depth to be 

 less than 20 per cent in the depth interval from 30 to 100 meters, 

 hence the two methods (equation 134) of estimating A</> are in good 

 agreement within this interval. The value of A (A.), corresponding to 

 30 meters, the smallest value of y for which the theory is valid, gives 

 the best estimate of A (A), and hence of 5',, since the variation of / t (A) 

 with respect to y is least for small values of y. Substituting the 



numerical values gives 



\c, 



(136) 



the mean annual theoretical temperature gradients that would be 

 expected at latitude 32 30' if there were no up welling and the other 

 conditions remained the same as those prevailing when the observations 

 in the San Diego region were made. The observed temperature 

 gradient at the depth of 600 meters not near shore would be inde- 

 pendent of seasonal variations and would be but little affected by 

 horizontal currents, and is in the depth interval of the observations 

 from which the constants of the theoretical formula for mean annual 

 temperatures were computed. 



