184 



Salinity of the Ocean, its Variation in Oceanic Space and in Time 



Kattegat 



Baltic 



30 



20 



10 



30 



20 



10 



Sk. L.R. O.FI. Sch. Gr Ky. Hfi. K.N. RB. G.R. 



Kattegat 



Large ondF Belt 



Baltfc 



Fig. 85. Changes in surface salinity betv.'een the North Sea and the Baltic (from the Skagerrak 



into the Baltic) in three cases (according to the individual values recorded on 2 and 16 April 



and 16 May 1938, according to Wattenberg). 



often at considerable speed in one or the opposite direction, and these displacements 

 are ttien associated with jump-like changes in T and S at any given point. 



In the sea straits so far discussed the equalization currents are superimposed (one 

 above the other) and the water movements occur along a boundary surface sloping 

 in the direction of the strait. This superposition of the two types of water appears to 

 be causally associated with the narrow width of these straits. If this surpasses a cer- 

 tain value then the interchange of the different waters no longer takes place through 

 currents flowing one above the other, but rather side by side in the strait, whereby the 

 boundary surface now slopes transverse or normal to the main longitudinal axis of 

 the strait. This type of water interchange is apparently present in the straits between 

 the White Sea and the Barents Sea (Timonoff 1925), see Vol. I, Chap. XVI, p. 1-3 

 for a discussion of the dynamics of this process. 



