Where : 



^i 



i=l , n 



11 



T = 



T = 



T,- = 



n = 



i = l , n 

 distance weighted mean tem- 



perature 



Value of an isotherm crossing 

 transect 



distance woiahting factor 

 equal to the distances between 

 the isotherm crossing and the 

 midpoints between it and adja- 

 cent isotherms or it and the end 

 point of the transect as shown 

 in figure below 



Mumber of isotherms crossing 

 the transects. 



Figure 13.1.— Formula and graphic portrayal of method used to calculate distance weighted mean sea surface 



temperature from contoured isotherm chart. 



214 



