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1

Short-term fluctuations of chlorophyll α fluorescence versus diurnal variations of solar radiation in the surface water of the Gdańsk Basin

100%

Magulski R. , Falkowska L. , Dunajska D. , Pryputniewicz D. , Sikorowicz G.

Oceanological and Hydrobiological Studies

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2004

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tom Vol. 33, No. 3

57--68

EN

Measurements of chlorophyll α fluorescence accompanied by solar radiation measurements were carried out during two spring cruises in the region of the Gdańsk Basin. Chlorophyll α fluorescence, similarly to that of chlorophyll a concentration in the seawater, showed considerable diurnal variability. The measurements provided statistically significant negative correlation coefficients that indicated that chlorophyll α fluorescence is inhibited as solar PAR and UV radiation intensity increases. The approximate range of radiation intensity that corresponded to a clearly marked decline in chlorophyll α fluorescence and chlorophyll α concentration was determined. It was revealed that the decline in chlorophyll a concentration in the surface water layer resulted from the photodegradation of chlorophyll α as well as phytoplankton grazing. In both cases, the resulting observation was an increase of pheophytine a concentration. The vertical migration of phytoplankton was identified as an additional process induced by high radiation levels.

2

The role of air masses on iron concentrations in wet atmospheric deposition over the urbanized coastal zone of the Gulf of Gdansk

100%

Falkowska L. , Lewandowska A. , Sikorowicz G. , Beldowska M. , Madeja J. H.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr 2

21-37

3

The role of air masses on iron concentrations in wet atmospheric deposition over the urbanized coastal zone of the Gulf of Gdańsk

100%

Falkowska L. , Lewandowska A. , Sikorowicz G. , Bełdowska M. , Madeja J. H.

Oceanological and Hydrobiological Studies

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2008

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tom Vol. 37, No.2

21-37

EN

This paper describes the role of air masses in transporting iron to the coastal zone of the Gulf of Gdansk. Fe(II) concentrations in rainfall were measured between 19th January and 30th November 2005 in Gdynia, during which time they varied from 0.74 žmol dm-3 to 97.45 žmol dm-3. The relationship between iron concentrations and precipitation amount, including during preceding rainless periods, was calculated. The effectiveness of washing iron out of the atmosphere is described by the exponential function of precipitation duration. Air masses arriving from west of the area transport terrigenous iron to the coastal zone of the Gulf of Gdańsk, while anthropogenic sources in Western Europe and Pomerania hardly affected the iron concentrations.

4

Short-term fluctuations of chlorophyll a fluorescence versus diurnal variations of solar radiation in the surface water of the Gdansk Basin

100%

Magulski R. , Falkowska L. , Dunajska D. , Pryputniewicz D. , Sikorowicz G.

Oceanological and Hydrobiological Studies

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2004

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tom 33

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nr 3

5

The impact of solar radiation on changes in chlorophyll a concentration in the sea surface microlayer in the southern Baltic

86%

Falkowska L. , Pryputniewicz D. , Magulski R. , Dunajska D. , Sikorowicz G. , Kowacz M.

Oceanological and Hydrobiological Studies

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2005

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tom Vol. 34, No.3

109--123

EN

The potential effect of an increase in ultraviolet radiation on organic matter in the sea surface microlayer and subsurface bulk seawater was evaluated in spring during three sampling periods in 1997, 1998, and 2000. The phytoplankton concentration is high in the water of the southern Baltic during this period. The results of temporal changes in chlorophyll a, phaeopigments, and oxygen concentrations were taken into account. An inhibitory effect (expressed as a decline in chlorophyll a concentrations) on biological processes in the sea surface microlayer as well as in the subsurface layer occurred around noon and in the early afternoon. High levels of ultraviolet radiation intensified chlorophyll a reduction. The measurements conducted in the microlayer and the subsurface layer indicated the possibility of photodamage to phytoplankton under natural conditions when there is an excessive increase of UV-B radiation in comparison to PAR. A significant increase in the phaeophytin a concentration and a decrease in the chlorophyll a concentration was observed at noon when the UV-B/PAR ratio was high.

6

The impact of solar radiation on changes in chlorophyll a concentration in the sea surface microlayer in the Southern Baltic

86%

Falkowska L. , Pryputniewicz D. , Magulski R. , Dunajska D. , Sikorowicz G. , Kowacz M.

Oceanological and Hydrobiological Studies

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2005

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tom 34

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nr 3

7

Iron wet deposition in the coastal zone of the Gulf of Gdansk [Poland]

72%

Dunajska D. , Falkowska L. , Siudek P. , Sikorowicz G. , Lewandowska A. , Pryputniewicz D. , Magulski R. , Kowacz M.

Polish Journal of Environmental Studies

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2006

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tom 15

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nr 1

EN

The concentrations of total iron were determined in the 30 rainwater samples collected at Gdynia station, located in the coastal zone of Gulf of Gdansk. The samples were assembled from December 2002 to November 2003. Total iron concentrations were measured using a colorimetric method with bathophenanthroline. The concentrations of major rain components (Na⁺, NO₃⁻-, Cl⁻, SO₄²⁻) were also determined. Concentrations of Fetot ranged from 0.26 μg·dm⁻³ to 0.51·10⁻³ μg·dm⁻³. The total annual flux of Fetot was 11.22 mg·m⁻²yr⁻¹, which suggests that wet deposition can be one iron source for phytoplankton in the Southern Baltic. Iron in rain came from both terrestrial areas and seawater. Particularly at E&SE winds the swash zone saturated with marigenic aerosols was a significant source of iron. In these causes an anthropogenic influence on rain acidification was found to be minimal.