The Movements of a Cold Water Front
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The two, relatively new methods adapted in oceanographic research -the permanent oceanographic stations in deep water and the registration of sea temperature on board coasting steamers and liners, prove effectively that they add to, and supplement the material collected on the cruises of the research ships most valuable. Further, by the help of these methods we have succeeded in solving important problems which would otherwise have been insoluable by only using the material obtained from the cruises. An example has been described above as to how the distribution of air pressure well in advance, can influence the herring fishery along the west coast. From the results here arrived at we shall when next a similar meteorological situation arises under comparable conditions of temperature, be prepared to expect certain consequences. We shall know reasonably far in advance when the (cold) Baltic water front will reach the several parts of the south and west coasts. We shall then be able to take our measures when it concerns the fishing. For a closer study of the movements of the water front, we shall then be able to apply the most suitable methods of investigation in ample time, and along the best localities, and also to examine nearer what effect different sorts of wind may have on the front after it has reached the Norwegian Coast. By maintaining two permanent oceanographic stations in the spring herring fishery district, one off Egersund and one off Bømlo, we will together with the oceanographic observations taken by the Flødevigen Hatchery near Arendal, the permanent station on the Sognesjø, and the temperature registrations taken on the line steamers, have at our disposal material that will allow of our being able to follow the movements of the front fairly well, and also decide the thickness of the penetrating watermass. A few oceanographic sections from the coast and seawards will also be valuable. When then all this auxiliary matter is established and tested, we shall be able to inform the fishermen as to how the situation lies, how it seems to develop, and what consequences it will have on the fishing. The fishermen will not then have to waste their time in fishing on banks where the cold water has already penetrated, but to seek deeper water, either along the slope of the Norwegian Channel, or at suitable places in the fjords where the depth is great enough, or that fishing be carried out in shallower water (to the north) where the front has not yet passed. Such a network of observations as here mentioned will be capable of supplying valuable oceanographic information of other kinds also.
SeriesFiskeridirektoratets skrifter, Serie Havundersøkelser
vol 6 no 5