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

100%

Stigebrandt A.

Oceanologia

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2017

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tom 59

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nr 1

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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An outline of the evolution of the Southern Baltic area at the end of the last glaciation and beginning of the Holocene

84%

Mojski J. E.

Biuletyn Peryglacjalny

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1995

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tom 34

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Baroclinic Rossby radius of deformation in the Southern Baltic Sea

67%

Osinski R., Rak D., Walczowski W., Piechura J.

Oceanologia

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2010

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tom 52

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nr 3

417-429

The first baroclinic Rossby radius of deformation (R1) is a fundamental horizontal scale of mesoscale processes. This scale is important for planning both numerical modelling and study areas. R1 was computed on the basis of an 11-year series of high resolution CTD measurements collected during r/v ‘Oceania’ cruises. The data set covered the three main basins of the Baltic Proper: the Bornholm Basin (BB), the Słupsk Furrow (SF) and the Gdańsk Basin (GB). The smallest mean value of R1 was found in the Gdańsk Basin (5.2 km), the largest one in the Bornholm Deep (7.3 km). The seasonal variability of R1 is lower in the western basin than in the eastern one. The seasonal cycle of R1 may be broken by extreme events, e.g. main Baltic inflows (MBI) of saline water. The inflowing water rebuilds the vertical stratification in the southern Baltic Sea and dramatically changes the R1 values. The difference of R1 between a stagnation period and an inflow situation is shown on the basis of observations made during 2002–2003. The main inflow occurred in winter, after ten years of stagnation, and the very low values of R1 (about 4 km) changed to very high ones (more than 9 km). Analysis of stagnation and saltwater inflow events may throw light on the value of R1 in future climatic scenarios. The potential influence of climate change on Baltic Sea salinity, especially a decrease in MBI activity, may change the baroclinic Rossby radius of deformation and the mesoscale dynamics. Values of R1 are expected to be lower in the future climate than those measured nowadays.

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Macrozoobenthos of the Gdansk, Gotland and Bornholm Basins in 1978-1993

67%

Osowiecki A., Warzocha J.

Oceanological Studies

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1996

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tom 25

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nr 1-2

Ograniczanie wyników

2 Oceanologia

1 Biuletyn Peryglacjalny

1 Oceanological Studies

1 Mojski J. E.

1 Osinski R.

1 Osowiecki A.

1 Piechura J.

1 Rak D.

1 Stigebrandt A.

1 Walczowski W.

1 Warzocha J.

1 2017

1 2010

1 1996

1 1995

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

An outline of the evolution of the Southern Baltic area at the end of the last glaciation and beginning of the Holocene

Baroclinic Rossby radius of deformation in the Southern Baltic Sea

Macrozoobenthos of the Gdansk, Gotland and Bornholm Basins in 1978-1993