The deviation of mean sea level from the mean geoid in the baltic sea |
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| Authors: | Martin Ekman Jaakko Mäkinen |
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| Institution: | (1) Division of Geodetic Research, National Land Survey, S-801 82 Gävle, Sweden;(2) Geodetic Institute, Ilmalankatu 1A, SF-00240 Helsinki, Finland |
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| Abstract: | The mean sea level along the Swedish coast has been recomputed, taking into account the effect of the permanent tide on the height system. The recomputed data show the deviation of mean sea level (1960) from the mean geoid, i.e. the oceanographic deviation of mean sea level, with NAP as zero. On the basis of a conversion between the Finnish and Swedish height systems, mean sea level data from the Finnish coast are reduced to the same system as on the Swedish coast.The geodetically determined mean sea level values are compared with oceanographic model calculations. On the whole, the agreement between geodesy and oceanography is found to be good. Nevertheless, oceanography tends to yield somewhat larger deviations of the mean sea level than geodesy, especially in the extreme parts of both the Gulf of Bothnia and the Gulf of Finland. This might indicate that the oceanographic model has overestimated some effect. However, across the Gulf of Bothnia the oceanographic model predicts slightly smaller mean sea level differences than the geodetic data suggest. |
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