Summary 



Equations (1). (2), and (3) together with the above interaction 

 terms were combined to form a 22-variable regression model with 

 23 coefficients to be determined by least squares: 



Surface temperature = 



a^- a,D --a„D- - an" -an'*- a_D° - 



aL -a-L-^al^- 



an^a,S'--a,,G- 



da.v-of-\"eai 



latitude 



longitude 



mam 

 effects 



°j,LD - a^.^LD' - a^W- 



a,_GD -a, MD - a_GD 



a.„LG 



(a^n--a^n-^)L 



<a„,L--a„ r'^)G 



latitude b\ da\ 



longitude by da.\ 



latitude bv longitude 



uitei- 

 actions 



36 



where D, L, and G are the day-of-year, latitude, and longitude, 

 respectively. This model is applicable to an area off the west 

 coast of the United States extending from 20 N to 58 N and from 

 the coast to 150 W. 



