l8 throvigh 36 of detail card no. 3 sxe reserved for solar radiation 

 data. Radiation data collected on the experimental cruises have not 

 been tabvilated and punched on the cards owing to shortage of manpower. 



Various thermal structure parameters of importance in forecasting 

 underwater sound can be defined in such a way that a computer can deter- 

 mine them by use of the temperature -depth data on the SERC cards. These 

 parameters, shown in figvire 2 and defined in appendix A, include surface 

 effect, layer depth, surface temperature, maximum gradient (thermocline ) , 

 mean gradient, and first gradient. For purposes of this study, the gra- 

 dient is considered to be the rate of change (*^/lOO') as temperature 

 decreases with increasing depth. 



A program written for the Datatron 205 (appendix A) computed each 

 of the above thermal structure parameters plus various nijmerical descrip- 

 tions of the parameters. The results were then punched in coliamns 57 

 through 80 of the master card and in columns 46 through 75 of detail card 

 no. 3» The numerical descriptions included the means of the gradients 

 (°F/100'), depths of the upper and lower bounds of the gradients, temper- 

 atures of the upper and lower bounds of the gradients, and thickness of 

 the gradients. 



Subseq.uent to preparation of this report (I96I), the Datatron 205 

 was replaced by an IBM 7070, necessitating rewriting of the programs. 

 A more extensive data error check was added, and an additional parameter, 

 the ascendant (increasing temperature with increasing depth), is computed. 

 The data relating to the ascendant is located in subsequent studies on 

 detail card no. 3 in columns 40 through U5 and 76 through 80. 



SURFACE WATER 

 TEMPERATURE 



, FIRST GRADIENT 



L ±_ 



MEAN GRADIENT 



FIGURE 2 SCHEMATIC DIAGRAM OF THERMAL STRUCTURE PARAMETERS 



