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Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin

Journal article
Authors Anders Stigebrandt
Published in Oceanologia
Volume 59
Issue 1
Pages 69–80
ISSN 0078-3234
Publication year 2017
Published at Department of marine sciences
Pages 69–80
Language en
Links dx.doi.org/10.1016/j.oceano.2016.09...
Keywords Vertical mixing; Inflow of new deepwater; Salinity; Currents; Baltic Sea
Subject categories Earth and Related Environmental Sciences, Oceanography

Abstract

This paper is based on the idea that the hydrographical conditions in the Bornholm Basin, and any other basin, can be understood from knowledge of general hydromechanical principles and basin-specific factors. Published results on the variability of the vertical stratification are shown and discussed. Such analyses demonstrate the residence time of water at different depth levels. Different modes of currents forced by winds and by stratification gradients at open vertical boundaries are presented. Vertical mixing is discussed and published results for the Bornholm Basin are shown. An experiment demonstrates that the diffusive properties of the enclosed basin, i.e. below the sill depth of the Słupsk Furrow, can be computed quite well from the horizontal mean vertical diffusivity obtained from historical hydrographical observations. A published two decades long simulation of the vertical stratification shows that the through flow and modification of new deepwater in the Bornholm Basin can be well described based on existing knowledge regarding crucial hydromechanical processes. It also suggests, indirectly, that there should be a weak anticyclonic circulation above the sill depth, which is supported by current measurements.

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