68 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 70 



teristic of the whole stretch from 37° north to 60° north. The 

 curves for the fields 10° to 19° west longitude take transition forms 

 between the curves for the field 0° to 19° west longitude and 

 those of the more westerly region. 



VARIATIONS OF THE SURFACE TEMPERATURES FOR THE COLDEST 



PARTS OF THE YEAR COMPARED WITH THE VARIATIONS OF THE 



YEARLY TEMPERATURES IN DIFFERENT PARTS OF THE SEA 



If, as we have already remarked, the surface temperature in the 

 North Atlantic Ocean during the coldest parts of the winter and 

 towards the end of it may be assumed for provisional purposes to 



me 09 1900 



•fim 



Figure 32. 



Figures 31 and 32. Curves for the surface temperatures of the 10° longitude 

 fields of the Danish observations north of 50° north latitude between 0° and 

 10° west longitude and 58° and 60° north latitude, between 10° and 20° west 

 longitude and 56° and 60° north latitude, between 20° and 30° west longitude 

 and 53° and 58° north latitude, between 30° and 40° west longitude and 

 58° and 54° north latitude, for February (fig. 31) and for March 16 to April 15 

 (fig. 32). 



be closely the same as that of the underlying masses of water to 

 considerable depths below, we may draw the following conclusions : 

 The variations in the surface temperatures during the coldest sea- 

 son of the year are not merely superficial and accidental deviations 

 in a thin surface layer, but in part, at least, indicate deep seated 

 changes in the temperature of the upper water-masses of the ocean. 

 These changes must certainly continue through a long time interval 

 and not simply in the brief intervals embraced in our observations. 



