I9IS-] 



IN AIR CIRCULATION OF THE GLOBE. 



207 



vapor cloud above Mt. Erebus, which starts from an elevation of 

 nearly 14,000 feet. 



Later Investigations. — In endeavoring to investigate further the 

 movement of the cirri upon the borders of the inland-ice, the data 

 supplied by the Greenland Expedition of the Berlin Geographical 

 Society have been taken into consideration. Stade in his tabulated 

 meteorological data at Station Karajak on the west coast, in some 

 thirty-nine instances has supplied the direction of movement of 

 the cirri observed. These I have plotted to form a wind-rose (Fig. 

 6),'*° which shows clearly the dominance of movements from the 



Fig. 6. Wind-rose for the cirri whose direction of motion was ob- 

 served at station Karajac, West Greenland (several identified doubtfully as 

 cirri are included). 



southwest towards the northeast, or in other words in the general 

 direction toward the interior region of the Greenland glacier.*^ 



The Evolution of the Glacial Blizzard and its Abrupt 

 Termination in Foehn. 

 The Sequence of Events. — While there is apparently much in 

 common between the Greenland and the Antarctic glacial bhzzards, 



40 H. Stade, 1. c, pp. 417-441. 



41 In central Europe Hesselberg has discovered a general correspondence 

 between the drift of the cirri and that of the low pressure areas, but in 

 view of the observations of de Quervain upon the stationary character of the 

 depression over Baffin's Bay, it is unlikely that this conclusion can be appHed 

 to the borders of the inland-ice (Th. Hesselberg, " Ueber die Luftbewegung 

 im Zirrusniveau und die Fortpflanzung der barometrischen Minima," Beitr. 

 z. Physik. d. fr. Atmosphdre, Vol. 5, 1913, pp. 198-205. 



