448 SOME RESULTS OF THE INTERNATIONAT. FISHEUV INVESTIGATIONS. 



in Mareli, 1004, a fuiUier development of tlie Atlantic flooding has 

 taken place. Both the northern and southern tongues have become 

 largely augmented, and Atlantic water now covers quite a considerable 

 fraction of the North Sea area. The iniliix of water from the European 

 stream into the North Sea therefore begins in August, gathers force 

 during the winter, and attains a maximum in early spring. From 

 thence onwards the flooding diminishes. 



The work of the Swedish hydrographers, carried out under the 



Fig. 5. 



International organization, in the Skagerak, and that of the Danes in 

 the Cattegat and the Belts, show that the same ebb and flow of Atlantic 

 water can be felt in those seas. " During the autumn," says Petters.son,* 

 " a heat wave from the Skagerak penetrates into the Baltic." From 

 August until November Atlantic water accumulates in the deep layers 

 of the Skagerak. In August this is overlain by surface water of low 

 salinity and a relatively high temperature. Wlien in November this 

 accumulation of salt water has reached its maximum, both of volume 



* Rappls. et Proc-verh., vol. iii., lOOG, p. 8. 



