14. Appendix E. Sample Listing of the Computer Output for 

 San Juan, P.R., and Amundsen-Scott, Antarctica 



A sample listing of the complete computer output of the mean iV-profiles for February, 

 May, August, and November at a subtropical and an arctic station is given in the first 

 section of this appendix. 



For instance, at station 11636 (San Juan, P. R.) in February (table E-l) , the heading 

 gives the number of pieces of data used to compute two types of tropopause height (based 

 on two types of temperature criteria) : 



(a) the mean heights where the extreme minimum temperature occurred in 320 indi- 

 vidual profiles was 17.56 km ± a standard deviation of 0.65 km, 



(b) the mean height of the bottom of the lowest atmospheric layer with a thickness 

 ^ 2 km and a temperature gradient = — 2°C/km in 307 temperature profiles was 16.44 

 km ± 0.96 km. 



This February profile also gives refractivity information at 40 height levels ranging 

 from to 30 km. Following each height level is a listing of the values of total refractivity, 

 gradient, dry and wet terms, and their respective standard deviations at that height above 

 surface. For example, at 1 km, 383 radiosonde profiles were examined, and the refractivity 

 was found to be 306.7 with a standard deviation of 8.22 A T -units ; the gradient at that level 

 was — 47.66 N/km with a standard deviation of 17.38 N/km; the dry term was 242.4 ± 

 1.19 A r -units, and the wet term was 64.3 ± 8.52 AZ-units. The correlation coefficients for 

 the data fit, within various height ranges, of the wet term (W) and the tropospheric (D^ 

 and stratospheric (D 2 ) dry terms to the line represented by a computed regression equation 

 are found at the bottom of each month's listing. In this example, for the dry term equation 

 {D x ), with a surface value of 271.9 and an exponential decay coefficient of — 0.1088, the 

 correlation coefficient is 0.999 and the standard deviation is 3.01 N-units. (These figures 

 were based on 5 years of data from the surface to 15 km.) 



At station 90001 (Amundsen-Scott, Antarctica) the wet-term value is so small at all 

 heights during the months studied that the regression equation from to 3 km becomes 

 meaningless. Because the South Polar region is not shown on the ground-based gradient 

 maps (figs. C-l through C-56) , a complete computer listing for Amundsen-Scott is included 

 in this appendix. This also illustrates the form of the original station data which were 

 used to plot the various values needed for the gradient maps. All gradients are in /V-units/ 

 km and all frequencies are Mc/s. The "profiles skipped" represents the number of profiles 

 which had gradients > — 100 N/km. 



120 



