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Significance of nutrient fluxes via submarine groundwater discharge in the Bay of Puck, southern Baltic Sea

Szymczycha Beata, Kłostowska Żaneta, Lengier Monika, Dzierzbicka-Głowacka Lidia

Oceanologia

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2020

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No. 62 (2)

117--125

EN

In this study, we collected submarine groundwater discharge (SGD) and seawater samples at six sites in the Bay of Puck, in the southern Baltic Sea, in order to estimate the nutrient distribution in groundwater affected areas. In addition, we estimated nutrient fluxes via SGD, including both fresh SGD (FSGD) and recirculated seawater SGD (RSGD), to the entire Bay of Puck. Phosphate (PO43−) concentrations varied significantly among study sites and seasons, while both ammonium (NH4+) and nitrates (NO3−) concentrations varied only seasonally. The N:P ratio indicated P limitation in most of the samples. The estimated seasonal and annual loads, via SGD, of both dissolved inorganic nitrogen (DIN; 9303 t yr−1) and PO43− (950 t yr−1), were the most significant source of nutrients to the Bay of Puck, and notably higher than quantified before (FSGD nutrient loads of 50 t yr−1 and 56 t yr−1 for DIN and PO43−, respectively). The SGD fluxes reported here indicate some of the highest rates of sediment-water fluxes reported in the Baltic Sea. These results suggest that SGD (both FSGD and RSGD) should be considered as source of chemical substances to the marine environment.

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Selected extreme weather events on the Polish coast of the Baltic Sea in the period 2001-2014

Filipiak J., Malinowska M.

Oceanological and Hydrobiological Studies

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2016

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Vol. 45, No. 3

405--423

EN

The article examines the spatial and temporal variability in selected extreme meteorological phenomena on the Polish coast of the Baltic Sea. Data from the 2001-2014 period related to a few meteorological and oceanographic elements were used to calculate indices of extreme weather events. The amount of intensive and widespread precipitation events in the 21st century corresponds well with the long-term means and is stable over a long period. The number of 50-60 frost days recorded per year has been systematically decreasing for several decades. Only a few deep cyclones occur per year and year-to-year variations of their number and magnitude corresponds to the overall long-term insignificant changes in the cyclone activity in the North Atlantic and the European region. The mean annual number of days with strong winds reaches nearly 8 cases per year. About 6 storm surges per year are recorded and this value has been slowly increasing in the long-term perspective. The rare occurrence of sea ice in 2001-2014 is a continuation of the reduction in the phenomenon observed in the 20th century. The passage of deep cyclones resulting in strong winds, storm surges and waves constitutes the most dangerous hazard to the coast.

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UV filters are an environmental threat in the Gulf of Mexico: a case study of Texas coastal zones

Sharifan H., Klein D., Morse A. N.

Oceanologia

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2016

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No. 58 (4)

327--335

EN

UV filters are the main ingredients in many cosmetics and personal care products. A significant amount of lipophilic UV filters annually enters the surface water due to large numbers of swimmers and sunbathers. The nature of these compounds cause bioaccumulation in commercial fish, particularly in estuarine areas. Consequently, biomagnification in the food chain will occur. This study estimated the amount of four common UV filters (ethylhexyl methoxycinnamate, EHMC; octocrylene, OC; butyl methoxydibenzoylmethane, BM-DBM; and benzophenone-3, BP3), which may enter surface water in the Gulf of Mexico. Our data analysis was based on the available research data and EPA standards (age classification/human body parts). The results indicated that among the 14 counties in Texas coastal zones, Nueces, with 43 beaches, has a high potential of water contamination through UV filters; EHMC: 477 kg year−1; OC: 318 kg year−1; BM-DBM: 258 kg year−1; and BP by 159 kg year−1. Refugio County, with a minimum number of beaches, indicated the lowest potential of UV filter contamination. The sensitive estuarine areas of Galveston receive a significant amount of UV filters. This article suggests action for protecting Texas estuarine areas and controlling the number of tourists and ecotourism that occurs in sensitive areas of the Gulf of Mexico.