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HOBBS— ROLE OF GLACIAL ANTICYCLONE [April 24, 



Distribution of Air Circulation in Successive Levels at the 

 Inland-Ice Margin. — De Quervain's data upon wind direction are 

 so vitally important as to merit some further consideration, particu- 

 larly as regards the distribution of circulation within the different 

 levels ; and I have therefore used them to plot the wind-roses for 

 each of the following ranges of altitude: Q-1,000 meters, 1,000- 

 3,000 m., 3,000-5,000 m. (also separately 3,000-4,000 m. and 4,000- 



Directions of Axes. 



Fig. 7. Wind-roses to illustrate the prevailing winds between the levels 

 indicated at stations on the west and southwest coast of Greenland (from 

 data by de Quervain). 



5,000 m,), 5,000-7,000 m., 7,000-9,000 m., and 9,000-11,000 m. 

 For the lower levels between 40 and 58 ascents were available, 

 whereas above 9,000 meters there were 13 and less. The wind- 

 roses have been plotted with weighting for wind force (5 m.p.s. 

 counting as one unit and the nearest unit being taken). Wind 



