202 HOBBS— ROLE OF GLACIAL ANTICYCLONE [April 24, 



Bay. It would then seem more in harmony with the facts to 

 reverse this conception and assume that the low pressure area is 

 stimulated to greater vigor by the arrival of the strong winds of 

 the glacial blizzard over the inland-ice. 



Foehn Level and Foehn Clouds on Greenland Coast. — In north- 

 east Greenland the monumental investigations by Wegener furnish 

 us with clearly defined results. In addition to full station weather 

 observations collected for a period of two years at two neighboring 

 stations — Pustervig, relatively near the inland-ice margin but within 

 a canyon, and Danmarks-Haven, fifty miles further outward and 

 upon the coast f'^ we have systematic observations with kites and 

 captive balloons in ascents to heights generally of 1,500 meters and 

 occasionally of 3,000 meters.^^ The results indicate that the larger 

 weather disturbances are in the main controlled by the great high 

 pressure area lying over the continent, that two strongly marked 

 lower inversions in the atmosphere occur almost uniformly ; the 

 first within the lower 200 meters and explainable by surface radia- 

 tion and latent heat of freezing and thawing, while the second lies 

 between a thousand and fifteen hundred meters of altitude, at which 

 level the great outward streaming from the inland-ice pours over 

 the rock plateau to the westward of the station (average height of 

 the plateau 800 meters). The most prevalent cloud form at the 

 stations consists of a series of flat mushroom shapes in a succession 

 of steps or stages located near the upper inversion level — on an 

 average, 1,200 meters. These being clearly due to foehn conditions, 

 they have by Wegener been given the name, " foehn clouds." 



The twenty-three ascents of kites and balloons which were car- 

 ried out at the time of more pronounced foehn, indicate that owing 

 to the partial disappearance at such times of the lower cold moist 

 layer, the temperature inversion of this lower layer is less pro- 

 nounced and the temperature fall in the layers above it more pro- 

 nounced, than at other times — in the most marked instances this fall 



31 A. Wegener, " Meteorologische Terminbeobachtungen am Danmarks- 

 Haven, Med. om Gronland, Vol. 42, 191 1, pp. 124-355. W. Brand und A. 

 Wegener, " Meteorologische Beobachtungen der Station Pustervig," ibid., 

 1912, pp. 446-562. 



'- A. Wegener, " Drachen- und Fesselballonaufstiege aus gefuhrt auf der 

 Danmark-Expedition 1906-08," ibid., 1909, pp. 1-75. 



