Activity Concentrations and Fluxes of Radiocesium in the Southern Baltic Sea |
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| Authors: | D Knapinska-Skiba R Bojanowski Z Radecki G E Millward |
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| Institution: | a Institute of Oceanology, Polish Academy of Sciences, ul Powstancow Warszawy 55, 81-712, Sopot, Poland;b Chemistry Unit, International Atomic Energy Agency, A-2444, Seibersdorf, Austria;c Department of Environmental Sciences, University of Plymouth, Plymouth, PL4 8AA, U.K. |
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| Abstract: | The activity concentrations of dissolved137Cs have been determined in the water column and137Cs and134Cs in the sediments and the sediment porewaters of the southern Baltic Sea. The mean activity concentration of dissolved137Cs in the Gdansk Deep declined from 109 Bq m−3in June 1986 to 61 Bq m−3in 1999. In sediments, the activity concentrations of137Cs (33-231 Bq kg−1) were highest in muds and the activity concentrations of134Cs were about 6% of the total Cs activity. The Chernobyl contribution to137Cs activity was between 43% and 77%. The porewater activity concentrations of137Cs in muddy sediments were in the range 71 to 3900 Bq m−3and were higher than those in the overlying seawater. The diffusive flux of dissolved137Cs from the muddy sediments was estimated in the range 5 to 480 Bq m−2year−1. The flux of137Cs from sediment porewaters of the southern Baltic Sea was about 45% of the total, including fluxes of137Cs from wet and dry atmospheric deposition and the fluvial inputs. The results were used to elucidate the rate of recovery of the sediments and the waters of the southern Baltic from Chernobyl-derived137Cs. |
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| Keywords: | radiocesium sediments porewaters seawater fluxes Baltic Sea |
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