23 



Her findes altsaa overalt rn Kvælstofgehalt svarende 

 til en nogei lavere Temperatur end den observeredfc og det 

 i stærkesl Grad for de høiere Temperaturer, eller da Tem- 

 peraturen aftager med Dybden, tor de øverst liggende 

 Vandlag. Naar man erindrer, at Jacobsens I (bservationer 

 ere adførte i Ettersommeren og for det Meste paa Vand- 

 prøver fra saa smaå Dyb, at Luft- og Vandtemperaturens 

 aarlige Variation kan tænkes at have gjort sig gjældende, 

 vil dette ikke være saa v.mskeligt at forklare gjennem 

 Våndets < (pvarmning i Spmmermaanederne, medens Kvæl- 

 stofmængden maa antages at rette sig etter en Temperatur 

 mindst lige saa lav som den aarlige Middeltemperatur. 



At lignende Fhæuomener ikke ogsaa ere observerede 

 i de ovre Lag at det af den norske Nordhavsexpedition 

 undersøgte Hav. har sin simple Forklaringsgrund deri, at 

 Lufttemperaturen der selv om Sommeren ikke er høiere 

 md i ►verfladetemperaturen hellere omvendt. 



1 Den for Intervallet fra ti til 15° udledede Formel er lnr forud- 

 sa1 ;it gjælde ogsaa fra 15 til 20". 



The. proportion of nitrogen in this Table corresponds 

 accordingly to a somewhat l6wer temperature than that 

 observed, especially for the higher temperatures, or rather, 

 since the temperature diminishes with the depth, for the 



upper strata of the water. If, however. \ve bear in mind 

 that Jacobsen's ohservatious were instituted at the latter 

 end of summer, and the majority with samples of water 

 obtained from such trifling depths that the annua] variation 

 in the temperature of air and water probably exerted 

 some influence, this will not be difticult to accoimt for. 

 by reason of the heat stored in the water during the 

 summer months, whereas the amount of nitrogen must be 

 regulated liv a temperature at least as low as the mean 

 annual temperature. 



That similar phenomeua were not observed in the upper 

 strata of the water throughout the tract of ocean investigated 

 on the Norwegian Xorth-Atlantic Expeditiou. arises simply 

 from the fact, that the temperature of the air in those 

 regions does not even in summer exceed that of the water 

 at the surface, nav the reverse is rather the case. 



1 Tlie fonuula deduced for the interval from 0° to 15° is here as- 

 sunied to be correct fa- that extending from 15° to 20°. 



