Wyniki wyszukiwania

1

Patchiness of hydrophysical fields in the light of data from the PEX-86 experiment obtained at anchored stations

100%

Druet C., Siwecki R.

Oceanologia

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1989

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tom 27

2

Effect of turbulent mixing on the marine plankton vertical distribution: model simulations

100%

Dzierzbicka-Glowacka L.

Polish Journal of Ecology

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2006

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tom 54

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nr 2

The effect of the turbulent mixing processes within fine structure of hydrophysical field on the prey and predator biomass is presented. The calculations were made on the basis of an one-dimensional prey-predator ecosystem model on the assumption of an absolutely stable vertical distribution of the average sea water density and that vertically intermittent layer are horizontally homogeneous. This model was tested with data obtained from the southern Gdansk Gulf (Baltic Sea). The vertical distributions of temperature and salinity fields were taken as initial conditions for various simulations. The numerical simulations were computed for different values of the wind speed. This study reveals that an intensity of the layer-mixing increase with the increase of the wind speed and duration of the turbulent disturbance. For low values of wind speed (U₁₀ < 2 m s⁻¹) and for short time of action of hydrodynamic sources of mixing (tₜ < 60 min.), fine-scale interlayering is not created in investigated case. It is also shown that the thicker the layer, the smaller the structural anomaly. The presented results demonstrate that the dynamic processes are responsible for the shape of vertical profiles of investigated characteristics to the same extent as physiological processes. Hydrodynamic conditions play a basic role where the microstructure of investigated functions is concerned.

3

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The fine structure of marine hydrophysical fields and its influence on the behaviour of plankton: an overview of some experimental and theoretical investigations

100%

Druet C.

Oceanologia

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2003

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tom 45

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nr 4

This article is an overview which presents in brief some of the results of research done in the last 20 years on the structure and dynamics of intermittent fine structure in the euphotic zone of the sea and its effect on the behaviour of marine plankton. The introduction provides a general characterisation of this structure and its relations with the plankton concentration field. Chapter 2 covers turbulent mixing processes in layers of homogeneous fine structure,and discusses the dynamic interactions of these layers and how these affect the behaviour of marine phyto- and zooplankton. The principal conclusions,in brief, are that the current state of knowledge,no t only of intermittent fine structure itself and its dynamic transformations,but also of the influence of these processes on the behaviour of marine plankton,i s today still a long way from permitting an accurate description of reality. Moreover,b oth empirical investigations (in situ and in the laboratory) and mathematical modelling,despite the quite advanced stage that the latter has reached,need to be continued. For this reason the prime aim of this article is to show up the gaps in our knowledge which future research in this complex,in terdisciplinary area of oceanography should attempt to fill.

4

Interannual variability in the hydrophysical fields of the Norwegian-Barents Seas confluence zone

80%

Piechura J., Walczowski W.

Oceanologia

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1996

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tom 38

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nr 1

Ograniczanie wyników

3 Oceanologia

1 Polish Journal of Ecology

2 Druet C.

1 Dzierzbicka-Glowacka L.

1 Piechura J.

1 Siwecki R.

1 Walczowski W.

1 2006

1 2003

1 1996

1 1989

Patchiness of hydrophysical fields in the light of data from the PEX-86 experiment obtained at anchored stations

Effect of turbulent mixing on the marine plankton vertical distribution: model simulations

The fine structure of marine hydrophysical fields and its influence on the behaviour of plankton: an overview of some experimental and theoretical investigations

Interannual variability in the hydrophysical fields of the Norwegian-Barents Seas confluence zone