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The hydrographic-hydrochemical state of the Baltic Sea in 2013

The article summarizes the hydrographic-chemical conditions in the western and central Baltic Sea in 2013. Based on meteorological conditions, the horizontal and vertical distribution of temperature, salinity, oxygen/hydrogen sulphide and inorganic and organic nutrients are described on a seasonal scale.

For the southern Baltic, the ‛cold sum“ of the air temperature in Warnemünde of 109.5 K d 2012/13 ranks on place 26 of the coldest winters since the beginning of the record in 1948 and was slightly above the long-term mean. The summer ‛heat sum“ of 230.4 K d was well above the long-term mean of 148.8 K d and ranks on place 10 of the warmest summers.

In 2013, inflow events with estimated volumes between 100 and 300 km3 took place four times: in December 2012/January 2013 (157 km3), in January/February (195 km3); both of barotropic type. A more baroclinic inflow in March April brought 160 km3 into the Baltic. In November/December several phases of westerly winds imported around 200 km3. However, all these inflow events did not reach the central Gotland Sea where the stagnation period continued undiminished.

Dr. Günther Nausch

Complete report in:
Marine Science Reports 93 (2014)
Nausch, Günther; Naumann, Michael; Umlauf, Lars; Mohrholz, Volker; Siegel, Herbert:

Hydrographisch-hydrochemische Zustandseinschätzung der Ostsee 2013

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