34 



BJØRN HELLAND-HANSEN AND FRIDTJOF NANStN. 



M.-N. Kl. 



ZOO 



300 



^00 



SOD 



well with the 

 vaIues(o.75'^C. 

 and 0.51*^ C.) 

 found above 

 for this differ- 

 ence between the two years. 

 The mean temperature 

 Mohn's Stats. 308, 330 

 and 331, and 342 (of July 

 2 1 St, and August 4th and 

 6th, 1878) is 2.55O C. 



The mean temperature of Makaroflfs 

 Stats. 33 and 16 (of September 4th 

 and August, 5th, 1899) is 2.48° C. 



The mean temperature of Isachsen's 



Stats. 3, 4, 10, and 11 (of June 25th 



and 27th, 1910) is 3.18^ C. 



The mean latitudes of these three different 



groups of stations are approximately the same, 



but owing to the difference in season, the mean 



temperatures would have to be increased to 2.80^ C. 



for Mohn's stations and to 3.78° C. for Isachsen's 



stations, in order to be comparable with the temperature 2.48° C. 



of Makaroff's stations. 



According to these values, the current should have been, in 

 1910, 1.30^ C. warmer than in 1899, and 0.98 '^ C. warmer than in 1878. 

 The mean temperature of Mohn's Stats. 306 and 308 is 2.22^ C, that 

 of Isachsen's Stats. 3 and 4 is 3.07*^ C, and that of Makaroff's Stat. 33 

 is 2.52° C. The first four of these were south of the last (see Fig. 21) 

 but taken earlier in the season. If we compensate for this, the mean 

 temperature of Mohn's stations should be 2.57° C, and of Isachsen's sta- 

 tions 3.70° C. The current in 1910 should consequently have been 1.18^ C. 

 warmer than in 1899, and 1.13" C. warmer than in 1878. 



The mean temperature of Makaroff's Stat. 16 (of August 15th, 1899) 

 was 2.45° C. That of Isachsen's Stats. 10 and 11 (of June 27th, 1910) 

 was 3.28^ C, which, owing to the earlier season, should be increased to 

 3.75O C. The current should accordingly have been 1.30" C. warmer in 

 1910 than in 1899. 



The curve of Hamberg's Stat. U. of September i, 1898, (Fig. 24), 

 compared with the curves of Isachsen's Stats, i and 11, and Makaroff's 



