Volta

Secular change of the seasonal variation in sea level and of the pole tide in the Baltic Sea

Regular sea level observations have been performed in Stockholm since 1825, yielding the longest unbroken series of monthly mean sea levels in the world. Applying Fourier analysis to these data we have investigated the annual and semiannual sea level variations as well as the pole tide. Whereas the semiannual variation has a fairly constant amplitude of about 4 cm, the annual variation shows a secular increase in amplitude from 8 to 10 cm. This increase is statistically significant at the 99% level. It is suggested that this change might be connected to secular changes of the oceanographic conditions that have been observed to occur in the northeastern North Atlantic, especially a movement of the oceanic polar front. The pole tide …

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