3-t 



BJ0RN HELLAND-HANSEN 



[REP. OF THE "AMCHAEL SARS" NORTH 



1 2 13 14 15 IS 17 18 19 20 21 22 23 O I 2 3 4 S 6 7 S S 10 II 12 13 14 15 16 L.M. 



I ■■' I ■ i I I I I ( I I I ( ■ 'I r "'■ I " 'I ■■ I ^ I ■ r ■ ■ r " I 1 ~ r 1 ' t ■ ■ r — ■» 



lOOm 



200 



500 



400 



500 



600 



m 

 ■SO 



-70 



60 

 -50 

 -40 

 ■50 



20 

 ■10 

 ■ 



Fig. 4. Combined diurnal and semi-diurnal variations of temperature, converted into vertical 



oscillations in metres. 



27. The Residual Variations. 



It was mentioned above (section 23) that the greater 

 part of the variations in temperature at Stats. 115 and Sc, 

 were covered by the diurnal and semi-diurnal variations 

 hitherto discussed. The curves in Fig. 5 illustrate the 

 variations remaining after elimination of the 12 and 24 

 lunar hours' variations, with tlie apparent vertical displace- 

 ment as argument along the ordinate. This figure may 



be compared witii Fig. 4, bofii figures having the saiue 

 scale for vertical distance. 



The residual variations are rather irregular. In some 

 cases they seem to be simultaneous and fairly uniform 

 through different depths, as for instance during many 

 hours at Stat. 115 at 200 and 300 metres, or between 

 1 and 6 L. H. at the Scottish Station through all depths 

 from 100 to 400 metres. There is evidently no definite 

 connection between the appearance of these oscillations 



