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Nutrient status in the Szczecin Lagoon - past, present and future prospects

100%

Pastuszak M., Wielgat M., Sitek S.

Oceanological Studies

2001

vol. 30

issue 1-2

59-86

Nutrient concentrations and their annual/interannual variability in the Szczecin Lagoon are shaped by variable riverine water/nutrient discharges and bio-geochemical processes in the Lagoon which modify the dissolved/suspended matter introduced. On an interannual scale, nitrate and phosphate concentrations in the Lagoon in 1969-97 displayed quite considerable variability, with maxima of NO3 coinciding with minima of PO4 concentrations. Both NO3 concentrations in the Lagoon and total nitrogen loads showed a strong positive correlation with the water volumes discharged (r = 0.73 and 0.82, respectively). This dependence was much weaker and negative for PO4 (r = - 0.51), and weak and positive for total phosphorus loads (r = 0.35). It would appear, therefore, that in the catchment area of the Oder River, nitrogen sources are mainly diffuse, while phosphorus is derived from point sources. There was a considerable predominance of nitrates in the inorganic nitrogen pool, but the presence of ammonium in large concentrations in winter and summer was also evident. Among the inorganic nutrient species, nitrates exhibited the highest transformation rate into organically bound forms (over 60%) while passing through the Lagoon. The mechanisms responsible for the nutrient transformation patterns in the Lagoon - temperature, in particular - are discussed in the paper. Phytoplankton production in the Lagoon appeared to be phosphorus-limited in spring and nitrogen-limited in summer.

Studies on the formation and disintegration of grounded ice hummocks in sheltered areas of the southern Baltic coast

100%

Girjatowicz J. P.

Oceanological Studies

2001

vol. 30

issue 3-4

3-16

Certain ice-related processes and phenomena associated with formation and disintegration of grounded ice hummocks in sheltered areas are discussed. The descriptions and discussion are based on the author?s research carried out over many years in the southern Baltic coastal lagoons. The first part of the paper focuses on the hummocking process which may be invoked to explain the formation of high (up to 10 m above the water level) hummocks. Conditions necessary for hummocking are described and the areas and seasons during which hummocks occur are indicated. In the second part of the paper, the rate at which the hummock height is being reduced during: 1. windless weather with below-zero air temperature, and 2. windy weather (strong wave action) and above-zero air temperature, is discussed. The formation of the so-called ice depression around a hummock is described as well. In the concluding part, attention is being paid to destructive effects of ice in the area affected by hummocking

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2 Oceanological Studies

2 2001

1 Girjatowicz J. P.

1 Pastuszak M.

1 Sitek S.

1 Wielgat M.

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Nutrient status in the Szczecin Lagoon - past, present and future prospects

Studies on the formation and disintegration of grounded ice hummocks in sheltered areas of the southern Baltic coast