gri^ e 



Theory of the Winds. 



21 



in high latitudes the mean annual temperature over the sea 

 is greater than that over the land : there are also steep 

 temperature gradients from the equator to the poles. 



Fig. 6 shows the mean temperatures for January along 



Fig. 6. 





Latitude 



K 





1 ' 





















e 























c 









f 







Ns 









50' 







/, 



V 







v 



s. 











■/ 





January. 





\ 



N 







30° 





/ 



s 









> 



\ 







r 





















c 

















\ 



/SXWL. 





„ 

















A 







-10' 

 -20° 

















^ 



L \ 



















\K 



















1 " 







S. 80° 60° 40° 20° 0' 20° 40° 60° 80° N. 



the same meridians. Here the low temperatures over the 

 land areas, as compared with those on the oceans in similar 

 latitudes, are more marked. Fig. 7 shows the July tem- 

 perature gradients. Here the temperature over the land 

 is much greater than it is over the sea in similar latitudes. 



Fis. 7. 



90 



eo 



70 



eo 



50 

 40 

 30 

 20 

 10 

 



Latitude 



£ 















y — *"s! 



















/ 



\ 





















■>> 

















July 





\ v 



\75°S.L. 



















/5"m:aN 











: : 













w 









X 













































































S. 80' 60° 40° 20° 0° 20° 40° 60° 6 



b IM. 



In figs. 5, f>, and 7 wo see that in the Southern Hemi- 

 sphere, which is very largely covered by water, the mean 

 annual temperatures, and the temperatures for each month, 

 do not vary as greatly as they do in the Northern Hemisphere. 



