Figure 162. Average atmospheric pressure for September through 

 November, 1937 to 1939. 



From these maps it is evident that on the average, over the entire year, the Arctic high is 

 sufficiently defined and is separated from the East Siberian high by a belt of low pressure joining 

 the Iceland and Aleutian lows. 



In summer, however, contrary to expectations, an area of low pressure is clearly marked in 

 the region extending from the Pole towards the New Siberian Islands . 



But the distribution of atmospheric pressure determines the general circulation of ice. If the 

 position of highs and lows varies from season to season, the circulation of ice and its general be- 

 havior also varies in accordance. 



Anomalies in distribution of pressure have a still greater practical importance for the quan- 

 tity and distribution of ice along the course of the Northern Sea Route. One of the maps of pres- 

 sure anomalies compiled hy Kirs h at my request is shown further in figure 193. 



LITERATURE: 70, 72, 77. 



427 



