126 



N CLIMATOLOGY 



I FEBRUARY 

 330 



I AUGUST 



DEN CBI HAT OAK 



2 3 4 



DISTANCE (KmxIO') 



Figure 4.30. West-east No cross section for the central United States. 



the influence of the Pacific high is in evidence over Oakland, while in the 

 interior of the continent the influence of tropical maritime air is noticeable 

 up the Mississippi Valley. The zonal cross section across the southern 

 United States, figure 4.31, shows a transition from the Mediterranean 

 climate of the Pacific coast to the humid subtropical type from Browns- 

 ville eastward. Here again the east-coast A^o values, from a higher 

 temperature regime, are larger than those in the west. The summer- 

 time chart is similar to the winter one with the A^-gradient intensified all 

 along the route. 



Figure 4.32 is for the longest cross section, extending approximately 

 22,000 km from Canton Island (CAN) to Wiesbaden (WSB) in northern 

 Europe. The winter chart shows a gradual decrease in N from Canton 

 Island to Brownsville and Cocoa, with very uniform A^ structure over the 

 Atlantic to Ship "J," and onwards to Wiesbaden. The summer chart 

 shows a double maximum, one at Canton and the second over the warm 

 North American continent between Brownsville and Cocoa. The gradual 

 decrease in mean temperature northward across the Atlantic Ocean is 

 evidenced by the rather uniform decrease of A^o between Cocoa and 

 Wiesbaden. 



