13. Appendix D. World Charts of Tropopause Heights 



Five-year mean tropopause heights obtained in the process of computing N (z) 

 parameters for February, May, August, and November at the 112 stations listed in table 

 A-l were plotted and contoured. Maps of these heights, given in figures D-l through D-4, 

 represent the average of all of the individual altitudes which marked the base of the first 

 layer which had a thickness of at least 2 km and a temperature lapse rate of less than 

 2°C/km (see sec. 6). 



180 150 



90 60 



180 150 120 90 



60 30 



60 90 120 150 



FIGURE D-l. Tropopause heights (km), based on temperature lapse rate: February. 



117 



