1915- No. 5- ROALD Amundsen's ANTARCTIC expedition: meteorology. 6q 



V. The Temperature of the Air. 



T. The vertical distribution of Temperature. 

 Taking the same steps as those from which the height of the stations 

 has been computed, I find. 

 For the Barrier 



Temp, increasing with height Temp, decreasing" with height 



Number Sum Sum Number Sum Sum 



Mean decrease of Temperature i'^'.3o per 100 metres. 

 For the Glacier and the Plateau. 



Temp, increasing with height. Temp, decreasing with height. 



Number Sum Sum Number Sum Sum 



of of of of of of 



Cases Heights Temp.s Cases Heights Temp.s 



35 4003 m • 4i°.9 34 5968 m. 83°.o 



Total. Number of cases Sum of heights Sum of Temp.s 



69 9971 ni. 41°- 1 decrease 



Mean decrease of Temperature o".4ii per loo metres. 

 Barrier and Mountain. 



Number of cases Sum of heights Sum of Temp's 



128 11418 m. 60°. 2 



Temperature decreases with height o'^Kyj per loo metres. 

 The total number of cases with increasing temperature is 59 

 » » » » s •> decreasing « » 67 



The great proportion of increasing temperatures, 47 per cent, shows that 

 inversions of temperature are almost as frequent as decrease of temperature 

 with height. It is the higher rate of decrease ^ that renders the average 

 fall of temperature with height as great as o^\53 per 100 metres, a value 

 of the same magnitude as that which has been found in other mountainous 

 regions of the Earth. 



2. The horizontal distribution of Temperature. 

 By reducing the observed temperatures to sea-level with o'l53 per 

 100 m., taking the differences between the synchronous observations of 

 Framheim (from the corrected thermograms! and the temperatures reduced 



' In the few cases of a wind-velocity of lo m. p. s. and upwards, the rate of decrease 

 averages 2° per 100 m. 



