Pathways of suspended particles transport in the bottom layer of the southern Baltic Sea depending on the wind forcing (Numerical Simulation) |
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Authors: | V M Zhurbas Jü Elken G Väli N P Kuzmina V T Paka |
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Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia;2.Institute of Marine Systems,Tallinn Technology University,Tallinn,Estonia;3.Atlantic Branch of the Shirshov Institute of Oceanology,Russian Academy of Sciences,Kaliningrad,Russia |
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Abstract: | A random-walk model for a nonuniform diffusivity media coupled with an ocean circulation model has been applied to describe
the pathways of suspended particles transport in the bottom boundary layer (BBL) of the southern Baltic Sea. The circulation
model is based on the Princeton Ocean Model, in which the vertical grid size is logarithmically refined towards the bottom
in order to resolve the BBL. Fields of the flow velocity and eddy diffusivities simulated by the POM, along with the settling
velocity of the suspended particles, are used as an input for the random-walk model. A number of numerical experiments were
performed to study the pathways of suspended particles in the southern Baltic BBL depending on the wind conditions. In particular,
the suspended particles introduced into the BBL in the center of the Bornholm Basin at westerly and southerly winds are found
to be trapped in the basin provided that the particles’ settling velocity is equal or greater than 2 m/day. The trapping phenomenon
is explained by the combined effect of the Ekman transport convergence in the BBL due to the cyclonic gyre and the gravitational
settling of the particles. |
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