(c) Siberia and the Canadian interior in 

 winter because of the intense surface tempera- 

 ture inversion. 



(d) the Mediterranean and Black Seas 

 during summer when convective mixing greatly 

 increases the near-surface humidity. 



(e) India in the spring, when increased 

 heating over land produces a low-pressure re- 

 gion which leads to onshore winds and humid 



WORLD MAPS OF A AT 11 



weather conditions until the onset of the mon- 

 soon. 



In winter a combination of high and low 



aA7 values appear near the tip of southwest 

 Africa as the subsidence from the South At- 

 lantic High causes a large moisture gradient to 

 appear off the coast, whereas a small humidity 

 gradient is characteristic of the dry plateau 

 region inland. 



