A new database developed by the University of Cantabria provides data on sea level variation due to atmospheric1 changes in the south of Europe between 1948 and 2009. Over the last two decades sea levels have increased in the Mediterranean2 basin. The meteorological sea level or meteorological tide component3 is the variation of the sea level as a result of atmospheric changes or more specifically, changes in the atmospheric pressure and the wind at the sea surface, Alba Cid explains, Alba being the lead author of the study published in the journal Climate Dynamics4 which analyses 62 years worth of data for this sea level component.Cid and her team at the Environmental Hydraulics Institute at the University of Cantabria have generated two time series for meteorological tides in the Atlantic and Mediterranean basins in the south of Europe and the Canary Islands.In total, they have analysed the trends from 1948 to 2009, reflected in a new Global Ocean Surges database. The simulation tool used is the numeric Regional Ocean Modelling System developed by the University of Rutgers .The results are very different depending on the period. The trends from 1948 to 1989 are very small and negative in all of the area analysed, which means that the meteorological tide has decreased during this time period, points out Cid.On the African coast of the Atlantic, the Adriatic coast and the north-east of the Eastern basin, the meteorological component to sea level has decreased by 0.35 millimetres for every year during this period. The trends are weaker on the Spanish coast of the north Atlantic and along the African coast in the Eastern basin of the Mediterranean.However, over the last two decades, from 1989 to 2009, the trends are positive, or rather sea levels have increased, and to a greater degree. The tides present values of less than 0.5 mm per year in the Atlantic basin and more than 1 mm a year in several areas of the Mediterranean coast.The GOS database also differentiates5 between summer and winter in each time series. According to the study, the trends observed in winter are negative in the areas analysed. The decrease in sea levels is more obvious in the centre of the Mediterranean and the Adriatic Sea.The sea level rises in summer, especially in the North Atlantic, the Spanish coast of the Mediterranean and the Tunisian coast. Although negative trends of 0.3 mm a year can also be observed during this season along the African coast of the Atlantic, the researchers highlight from the study.
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1 atmospheric adj.大方的，空气的；大方层的；大方所引起的 参考例句： Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大方环流是密切有关的。 Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大方窗区向地表辐射能量。
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