ARCTOWSKI, CHANGES IN DISTRIBUTION OF TEMPERATURE m 



Nevertheless, comparing the yearly temperature departures of the Ice- 

 landic stations and Angmagsalik, on the east coast of Greenland, with the 

 state of the ice in Denmark Strait and north of Iceland, one finds that a 

 correlation is undeniable. 



Now, why is the variation of Grimsey (Fig. 57) so much more accen- 

 tuated than that of Berufjord or Vestmanno? It seems evident that the 

 proximity of the ice must be the cause. 



Consequently, the Icelandic consecutive temperature curves could be 

 taken as an example proving the influence of the ice on tlie variation of 

 temperature. The ice conditions of Denmark Strait must greatly influ- 

 ence the temperatures of Grimsey, especially some of the monthly means, 

 by accentuating them one way or the other. It is not, however, the ice 

 which causes the observed variations of temperature producing the for- 

 mation of pleions and antipleions. The departure maps I have drawn 

 show this plainly. 



The changes of ice conditions are more or less local phenomena re- 

 stricted to small areas ; the formation and development of the pleions and 

 antipleions, on the contrary, are a imiversal phenomenon. 



Conclusions 



In the case of the annual departures of temperature for the years 1891 

 to 1900, which I utilized in my previous investigations, I dealt with the 

 results of observations made all over the world and gained therefore some 

 precise knowledge of the distribution and extent of the pleions and anti- 

 pleions, and found that the years 1893 and 1900 were particularly inter- 

 esting, the first being a year of predominant antipleions and the second 

 being a typical pleionian year.^- 



In 1900, the pleions were not only very accentuated, with exceptionally 

 high departures at their centers, but the areas they covered were fused 

 together in such a way that the antipleions appeared as isolated patches 

 on a pleionian background. The year 1900 was exceptionally warm, the 

 temperature of our atmosphere being above the average, the negative 

 areas being insufficient to compensate the excess of temperature of the 

 positive areas. 



In some cases, — the map for 1909 (Fig. 61) shows it plainly, — conju- 

 gated pleions form bands of very extensive dimensions. In other cases, 

 there are intercrossing pleionian bands forming a real network with 

 antipleionian patches between. 



'^Op. cit., p. 123. 



