PHYSICAL OCEANOGRAPHY 281 



from the Norwegian Sea ; the boundary between these layers 

 hes deeper at Station 106 than at the neighbouring stations, the 

 difference of level amounting to 200 metres. In order to get 

 as true a picture of the conditions as possible the stations were 

 placed at short intervals of only 20 nautical miles ; there may 

 be great differences within 20 miles, as from Station 105 to 

 Station 106, and fewer stations at longer intervals might have 

 given a totally false representation. Knowing the distribution 

 of salinity and temperature, we may now draw conclusions as 



'06 /05 /04 /03 



200 



300 



400 



500 



Fig. 190.— The Southern Section in the Faroe-Shetland Channel 

 (loth-iith August 19 10). 



to the nature of the currents, their direction, breadth, and depth. 

 Our section has a rather irregular look, suggesting complicated 

 conditions ; it seems, for instance, as if the Gulf Stream were 

 divided into two branches, one close to Shetland, and one in 

 the middle of the channel. In the present case the variations 

 from one station to another are probably in part caused by 

 the vertical oscillations mentioned, but they are evidently in 

 part due also to another important phenomenon, viz. vortex 

 movements. 



One of the objects of our joint-research with the Scottish Vortex 

 investigators in the Faroe-Shetland Channel was to throw light '"ovements. 



