ARCTIC INFLUENCES ON AMERICAN CLIMATE 



Ms 



47 



Figs. 10-15 — Maps showing the distribution of atmospheric pressure on six consecutive days in 

 January, 1924, over the poleward part of the northern hemisphere. (Reproduced from the maps 

 illustrating the paper by V. Bjerknes cited in footnote 3.) Scale, i : 215,000,000. 



A major high, centered over the Siberian side of the Arctic Basin on January 21, can be traced spread- 

 ing into central Asia and finally separating into two halves, a Siberian and a Canadian. This high is 

 bordered by a series of lows, the circumpolar progress of the westernmost of which from the lower 

 Mackenzie to Novaya Zemlya is indicated by arrows in Fig. 15. {Continued at bottom of opposite 

 page.) 



