Studying chemical exchange across the water-bed interface in Golubaya Bay,the Black Sea |
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Authors: | A G Rozanov A V Vershinin A V Egorov |
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Institution: | 1.Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The results of first application of automated bottom station for studying chemical exchange across the water-bed interface
(IO RAS lander) were obtained for the case of sediments in the northwestern Black Sea near Gelendzhik (Golubaya Bay). The
lander is equipped with bottom chambers, sensors of environmental characteristics, and samplers, allowing fluxes of chemical
elements through the water-bed interface to be determined directly. Bottom sediments were represented by organogenous silts
containing hydrogen sulfide. The high activity of diagenetic processes resulted in a higher consumption of O2 by sediments (the flux from the bottom water was 130 mM/(m2/day), high fluxes of biogenic elements (P, Si,) and metals (Mn, Fe). At the same time, fluxes across the water-bed interface
were evaluated based on the difference between concentrations of these elements in the near-bed and silt water (Fick’s law).
The obtained data demonstrate the priority of direct measurements of fluxes (lander) over the calculation method. The first
application of the lander suggests the need for methodological improvements both of engineering character and in chemical-analytical
support. |
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