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Oceanological Studies
|
1998
|
vol. 27
|
issue 1
53-59
EN
Studies were carried out on net phytoplankton of an urban Lake Jeziorak Maly, Mazurian Lakeland. Samples collected in 1996 showed domination of blue-green algae(67% of the total phytoplankton number). Limnothrix redeckei and Plankto-thrix agardhii were particularly abundant. The measurement of the water temperature during the mass occurrence of these species revealed, that Limnothrix redeckei dominated at 180C and Planktothrix agardhii at 200C.
EN
The influence of advection on spatial distribution of temperature in the Gulf of Gdansk is ana-lysed. In this analysis heat fluxes are completely omitted. The advection is brought about mainly by winds and depends particularly on their direction. Eastern winds curry the surface waters (usually contaminated) out of the Gulf and cause the inflow of cool bottom waters from the Gdansk Deep. The same winds induce the movement of the oceanic salty and oxidized water from the Bornholm to the Gdansk Deep via the Slupsk Channel. The advection during eastern winds is a desirable phenomenon for restoring the Gulf of Gdansk waters. The temperature distribution depends also on the advection influenced by meridional winds.
EN
Drainage basin of the Gulf of Gdansk is dominated by the river Vistula, as regards both the catchment area size and the amount of discharged water. The remaining watercourses flowing directly into the Gulf of Gdansk or via the Vistula Lagoon (the Lagoon is a component of the Gulf of Gdansk system) contribute slightly over 1/8 of the total water volume. The presented calcula-tions of riverine outflow from the catchment area of the Gulf of Gdansk were conducted based on data either published in hydrological yearbooks or purchased from the Institute of Meteorology and Water Management. Other data sources included the archives of the Physical Oceanography Department at University of Gdansk, scientific publications and the author's expertise. Statistical characteristics of riverine outflow and water temperature were prepared as required by the model. The annual cycles of riverine outflow and water temperature at the mouth sections in the Gulf of Gdansk are expressed by trigonometric functions in an averaged climatic scale.
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