352 Alf Trolle. 



Discussion of the Observations. 



The series from stations in tlie Greenland Sea. Series III — XI and 



LXXIII— LXXIX. 



As already mentioned, these series were taken from the "Dan- 

 mark" during the voyage to and from N. E. Greenland. 



As they were mainly taken as occasion permitted, e. g. when the 

 ship was not moving for other reasons (ice hindrances, fog, damage 

 to engines or the like), the situation of the stations is not always just 

 what the hydrographical investigations alone would prescribe, but 

 on the whole they give a good picture of the great changes in the tem- 

 perature and salinity, which we encountered as we sailed in from 

 the deep Greenland Sea towards the Greenland coast over the Con- 

 tinental Shelf, and of the reciprocal action between water of Atlantic 

 and Polar Current origin, which occurred here. 



The results from several of the stations are shown in sections. 

 Of these Sect. I passes through the stations at ca. 76° N. L., the di- 

 rection being thus almost across the direction of the Polar Current. 

 The section embraces stations investigated both in 1906 and in 1908; 

 it does not reach the land, as we did not have hydrographical sta- 

 tions in under the land at this latitude. 



Sect. II passes through the stations which we investigated at 

 quite short intervals on our departure from Danmarks Havn in the 

 deeper water between the coast and the Continental Shelf. The di- 

 rection of the section is almost parallel with the direction of the Polar 

 Current. 



Sect. Ill is a section imagined as the continuation of Sect. I right 

 into land, in order to give a picture of the isopykns there. 



I shall not endeavour to give an exhaustive description of the 

 interesting hydrographical conditions found in this part of the sea 

 on the basis of our observations, but may refer to B. Helland-Hansens's 

 paper in "Due d'Orléans: Croisière Océanographique 1905", where 

 these conditions have been dealt with in detail on the basis of Mag. 

 Koefoed's large material of observations. 



My observations give on the whole the same picture of the con- 

 ditions as those from 1905. In the following I shall restrict myself 

 to some details in connection with the sections. 



Remarks on Sect. I. (PI. XV). 



The section passes through the stations III to IX of 1906, VIII 

 and LXXIX of 1908. In thus including in the same section stations 

 which have been investigated in different years, an error is certainly 

 made, but a comparison with earlier observations shows, that the 

 changes from year to year are very small in comparison with the 

 changes in the direction from east to west. 



