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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