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In situ and simulated in situ primary production in the Gulf of Gdańsk

Renk H., Ochocki S., Kurzyk S.

Oceanologia

2000

No. 42 (2)

263-282

The method discussed in this article allows the simulated in situ primary production in the southern Baltic to be evaluated. To estimate the daily primary production at a~given field station, the following parameters have to be measured: the coefficients AN and Es (constants from the photosynthesis-light curve for phytoplankton), and the scalar irradiance attenuation coefficient (k), chlorophyll a concentration (Chl) and daily irradiation just below the sea surface (PAR). The results of simulated in situ primary production are in good agreement with the in situ measurements.

Photosynthetic light curves in the Pomeranian Bay

Renk H., Ochocki S., Chmielowski H., Gromisz S., Nakonieczny J., Pastuszak M., Zalewski M.

Oceanologia

1999

No. 41 (3)

355-371

Photosynthetic light curves at selected stations in the Pomeranian Bay were determined during four cruises undertaken in March and July 1996, and in May and October 1997. The mean assimilation numbers measured in particular seasons were as follows: spring - 2.46 mgC mgChl-1 h-1, summer - 3.99 mgC mgChl-1 h-1, autumn - 3.24 mgC mgChl-1 h-1 and winter - 2.17 mgC mgChl-1 h-1. A significant correlation was found between the assimilation number and water temperature over the entire period of study. In some seasons a dependence between the assimilation number and nutrient concentrations was also noted. Assimilation numbers in the areas adjacent to the Odra river months were higher than in the offshore zone.

Photosynthetic rate and light curves of phytoplankton in the southern Baltic

Renk H., Ochocki S.

Oceanologia

1998

No. 40 (4)

331-344

The paper presents photosynthetic curves for the phytoplankton population at three stations located in the Polish Economic Zone of the Baltic Sea, i.e. in the Gdansk and Bornholm Deeps and in the southern part of the Gotland Deep. Studies were carried out in 1995-1998. Assimilation numbers varied from 1.59 to 6.81 mgC mgChl-1 h-1, the average value being 3.31 mgC mgChl-1 h-1. Irradiation of photosynthesis saturation ranged from 216 to 673 kJ m-2 h-1. The seasonal variations in assimilation number and its dependence on water temperature are described.