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Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin

100%

Stigebrandt A.

Oceanologia

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2017

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tom 59

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nr 1

This paper is based on the idea that the hydrographical conditions in the Bornholm Basin, and any other basin, can be understood from knowledge of general hydromechanical principles and basin-specific factors. Published results on the variability of the vertical stratification are shown and discussed. Such analyses demonstrate the residence time of water at different depth levels. Different modes of currents forced by winds and by stratification gradients at open vertical boundaries are presented. Vertical mixing is discussed and published results for the Bornholm Basin are shown. An experiment demonstrates that the diffusive properties of the enclosed basin, i.e. below the sill depth of the Słupsk Furrow, can be computed quite well from the horizontal mean vertical diffusivity obtained from historical hydrographical observations. A published two decades long simulation of the vertical stratification shows that the through flow and modification of new deepwater in the Bornholm Basin can be well described based on existing knowledge regarding crucial hydromechanical processes. It also suggests, indirectly, that there should be a weak anticyclonic circulation above the sill depth, which is supported by current measurements.

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System for flood protection in Odra River basin - its efficiency during the flood of 1997

100%

Radczuk L., Dubicki A., Olearczyk D.

International Agrophysics

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1998

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tom 12

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nr 4

3

Pronounced anomalies of air, water, ice conditions in the Barents and Kara Seas, and the Sea of Azov

84%

Matishov G. G., Dzhenyuk S. L., Moiseev D. V., Zhichkin A. P.

Oceanologia

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2014

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tom 56

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nr 3

4

Modeling the ecosystem response to summer coastal upwelling in the Northern South China Sea

84%

Jiang R., Wang Y.-S.

Oceanologia

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2018

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tom 60

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nr 1

A coupled three-dimensional physical model and a nitrogen-based nutrient, phytoplankton, zooplankton, and detritus (NPZD) ecosystem model were applied to simulate the summer coastal upwelling system over the continental shelf of northern South China Sea (NSCS) and its impact on hydrographic conditions and ecosystem. The simulated results were comprehensively validated against field and satellite measurements. The model results show that the near shore ecosystem of NSCS has significant responses to the summer coastal upwelling system. The Shantou Coast to the Nanri Islands of Fujian province (YD) and the east of the Leizhou Peninsula (QD) are two main regions affected by NSCS summer coast upwelling. During summer, these two coastal areas are characterized by nearshore cold and high salinity upwelling current. Further, the summer coastal upwelling serves as a perfect nutrient pump, which lifts up and advects nutrient-rich current from deep to surface, from inner shelf to about 30 km outer shelf. This nutrient source reaches its maximum in the middle of July and then begins to decrease. However, the maximum phytoplankton and chlorophyll a do not coincide with the maximum nutrients and delay for about 10 days. Because of the intensive seasonal thermocline and the complicated current transporting through Qiongzhou strait, the ecological responding of QD is less pronounced than YD. This study has a better understanding of the physically modulated ecological responses to the NSCS summer coastal upwelling system.

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Annual cycle of phytoplankton community through the water column: Study applied to the implementation of bivalve offshore aquaculture in the Southeastern Bay of Biscay

84%

Muniz O., Revilla M., Rodriguez J. G., Laza-Martinez A., Fontan A.

Oceanologia

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2019

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tom 61

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nr 1

6

Metazoan parasites from herring (Clupea harengus L.) as biological indicators in the Baltic Sea

67%

Unger P., Klimpel S., Lang T., Palm H. W.

Acta Parasitologica

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2014

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tom 59

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nr 3

Zoographical distribution of metazoan fish parasites in herring, Clupea harengus, from the Baltic Sea was analysed in order to use them as potential biological indicators. A total of 210 herring from six different sampling sites were investigated, harbouring 12 different parasite species [five digeneans (D), one cestode (C), three nematodes (N) and three acanthocephalans (A)]. The distribution of the parasite species differed according to region, with a distinct gradient of decreasing species richness towards the east of the Baltic Sea. The western localities at Kiel Bay, Rügen and Poland had the highest parasite diversity, including the marine parasite species Anisakis simplex (s.s.) (N), Brachyphallus crenatus and Hemiurus luehei (both D). The eastern localities had low parasite species richness, predominated by the freshwater digenean Diplostomum spathaceum. We could identify three different Baltic herring stocks, the spring-spawning herring of the western Baltic reaching from the Kattegat to the German and Polish coast, the stock of the central Baltic proper and the northern stock of C. harengus var. membras of the Gulf of Finland. The limited distribution of the herring parasites within the Baltic Sea enables their use as biological indicators for migration patterns and stock separation. The acanthocephalan Pomphorhynchus laevis that has already been used as an accumulation bioindicator for heavy metals was only recorded for the western herring stocks. However, the presence of mainly generalistic parasites and their uneven distribution patterns make their use as indicators for regional environmental and global change more difficult.

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Interannual variability in the population dynamics of the main mesozooplankton species in the Gulf of Gdansk (Southern Baltic Sea): Seasonal and spatial distribution

67%

Dzierzbicka-Glowacka L., Kalarus M., Zmijewska M. I.

Oceanologia

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2013

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tom 55

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nr 2

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A review of biological research in the Vistula Lagoon

67%

Paturej E., Gutkowska A., Mierzejewska J.

Oceanological and Hydrobiological Studies

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2012

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tom 41

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nr 4

9

Hydrographic and hydrochemical conditions in the Gotland Deep area between 1992 and 2003

67%

Nausch G., Matthaus W., Feistel R.

Oceanologia

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2003

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tom 45

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nr 4

The paper describes the hydrographic-hydrochemical development in the eastern Gotland Basin between the major saltwater inflows into the Baltic Sea in 1993 and 2003. This period is characterised by only low inflow activity. The most important hydrographic events were the effects of the very strong inflow in 1993 and the weak inflows in 1993/1994 and 1997. The 1993/1994 inflows led to deep-water renewal, a steep fall in deep-water temperatures, and increasing salinity. The effects of the inflow of very warm, saline and oxygen-rich water in autumn 1997 were observed in the deep water in 1998, resulting in temperatures rising to 7◦C. The recent renewal in spring 2003 is reflected in the decreasing temperature, higher salinity and improved ventilation of the bottom water. Changes in the redox conditions exert a considerable influence on the nutrient distribution. During stagnation periods, there is enrichment of phosphate and ammonium, while nitrate is absent. Thus, around 31 μmol l−1 ammonium and 7 μmol l−1 phosphate were measured prior to the water renewal in 2003. Deepwater ventilation results in lower phosphate concentrations of around 2 μmol l−1, the nitrification of ammonium and the occurrence of nitrate. For the observation period, an estimate of nutrients stored in the deep water was done for the eastern Gotland Basin. During the recent stagnation period, there was an increase of up to 150% in the phosphate pool below the halocline, whereas the pool of inorganic nitrogen compounds decreased to 80% compared with 1992 when the previous stagnation period had ended. Under specific circumstances, these unbalanced nutrients can be made available to the upper water layers and can induce large-scale blooms of algae, especially of cyanobacteria.

Ograniczanie wyników

Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin

System for flood protection in Odra River basin - its efficiency during the flood of 1997

Pronounced anomalies of air, water, ice conditions in the Barents and Kara Seas, and the Sea of Azov

Modeling the ecosystem response to summer coastal upwelling in the Northern South China Sea

Annual cycle of phytoplankton community through the water column: Study applied to the implementation of bivalve offshore aquaculture in the Southeastern Bay of Biscay

Metazoan parasites from herring (Clupea harengus L.) as biological indicators in the Baltic Sea

Interannual variability in the population dynamics of the main mesozooplankton species in the Gulf of Gdansk (Southern Baltic Sea): Seasonal and spatial distribution

A review of biological research in the Vistula Lagoon

Hydrographic and hydrochemical conditions in the Gotland Deep area between 1992 and 2003