378 



Alf Trolle. 



water, was carried up to the surface layer by means of the mixing 

 processes mentioned and thus led to a less formation of ice in winter 

 and earlier breaking up of the ice, than would have been the case 

 if the water-masses in the sea had consisted merely of greatly cooled 

 Polar Current water. 



Fig. 8. Fire opening cut in tlie ice; C. B. Tliostrup phot. 



The series from Danmarks Havn. (Series XXXVII, XXXVIII, XL, XLI, 

 XLIII, XLV, L, LUI, LXX and LXXI). 



Danmarks Havn lies in a bay opening out of Øresund and the 

 hydrographical conditions here were therefore nearly the same as 

 those already described for Maroussia. 



