UNCLASSIFIED 



DOCUMENT CONTROL DATA -R&D 



of title, body of abstract and indexing annotation must be enfere. 



all report is classified) 



Navy Electronics Laboratory 

 San Diego, California 92152 



UNCLASSIFIED 



A PREDICTIVE HORIZONTAL-TEMPERATURE-GRADIENT MODEL OF THE 

 UPPER 750 FEET OF THE OCEAN 



Research Report 



July 1962 to July 196 5 



E.L. Smith 



17 March 1967 



90 



19 



PROJECT NO gR 0Q4 Q3 Q1 



Task 580 

 NEL L40461 



1445 



I (Any other numbe 



Distribution of this document is unlimited. 



Naval Ship Systems Command 

 Department of the Navy 



Time -dependent horizontal-temperature gradients were computed from vertical- 

 temperature cross sections taken with the towed thermistor chain in 17 areas of the 

 eastern North Pacific. The horizontal gradients were found to be generally smaller 

 than the vertical gradients by two orders of magnitude. The horizontal -gradient 

 field alternated regularly in sign, implying a dominant frequency of internal waves or 

 convection cells (with a corresponding wavelength of 0. 72 nautical mile). The 

 horizontal gradient in the thermocline can be predicted from the measured vertical 

 gradient by means of the equation: 



dT _ /kr\ - 71 



dx ' \d2 1 



On the basis of these results, plus a single bathythermograph lowering, a simplified 

 predictive model of the horizontal-temperature gradients was constructed. 



DD 



,1473 



S/N 0101-807-68 



UNCLASSIFIED 



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