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FIGURE 6 MEAN TEMPERATURE AT SURFACE AND 400 FEET IN AREA G 



0400 =0s^a~6-65 COS <^+A€>"'-^' ''" '^cos(a;t + 270") + 



^^-8.23 sin <^,,Q^2cut + I30»)+ (11) 



^^-9.42 sin 0cos(4ajt + 284°) 



An annual period predominates in this equation; however, since coeffi- 

 cients in the exponents of further harmonics did not differ much from one 

 another, the four harmonics were taken to approximate the original distri- 

 bution . 



In the upwelling region, area H, surface temperature distribution shows 

 a predominant annual period similar to that of the entire North Atlantic; 

 however, mean temperature distribution at 400 feet has a peculiar shape. 

 Semiannual and shorter periods are strongly developed. Although data are 

 sparse, this distribution can be considered quite real because approximately 

 the same pattern is repeated along all four latitudes in area H. The sum- 

 mary of factors computed from the corresponding Fourier expansions along the 

 four latitudes is given in table 3« 



The factors along each latitude are satisfactorily consistent. The ac- 

 cepted factor (means) computed for each latitude is presumed to yield good 

 approximation for the entire upwelling area. The only regular variation of 

 phase angle with latitude is detected in the third harmonic. Regularity of 

 the increase is probably accidental, because values of other angles do not 

 show orderly progression with latitude. Since scattering is not exceedingly 

 large, accepted mean factors for the four angles along individual latitudes 

 were applied throughout area H. 



Substituting the accepting factors in equation {h) and extending to 

 four harmonics yields: 



15 



