Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 5 2009 10.5194/acpd-9-22773-2009 http://www.atmos-chem-phys-discuss.net/9/22773/2009/ http://www.atmos-chem-phys-discuss.net/9/22773/2009/acpd-9-22773-2009.html http://www.atmos-chem-phys-discuss.net/9/22773/2009/acpd-9-22773-2009.pdf 22773 22801 2009-10-27 Bimodal variation in mercury wet deposition to the coastal zone of the southern Baltic P. Siudek pati@ocean.univ.gda.pl L. Falkowska A. Urba Departament of Marine Chemistry and Environmental Protection, Institute of Oceanography, Gdansk University, Marszalka Pilsudskiego 46, 81378 Gdynia, Poland Ecological Spectroscopy Laboratory, Institute of Physics, Lithuanian Academy of Sciences, Gostatuto 12, Vilnius 2600, Lithuania In the following periods: November 2005–June 2006 and October 2007–January 2009, concentrations and deposition rates of total mercury (THg) and Hg(II) were measured in precipitation over the urbanized and industrialized area of the southern Baltic – the city of Gdynia. Rains over the coastal zone had different concentrations of total mercury, they ranged from 8.6 to 118.0 ng L^−1, out of which about 32% were labile, inorganic forms, easily reducible in a SnCl₂ solution. Over the southern Baltic two maxima of concentrations were observed: first, in the heating season and second, in the non-heating season. 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