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    Wyświetlanie 1-6 z 6
    Tytuł:
    Nutrient turnover at the hypoxic boundary: flux measurements and model representation for the bottom water environment of the Gulf of Riga, Baltic Sea
    Autorzy:
    Eglite, E.
    Lavrinovics, A.
    Muller-Karulis, B.
    Aigars, J.
    Poikane, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/47584.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    flux measurement
    bottom water
    denitrification
    biogeochemical modelling
    hypoxia
    Riga Gulf
    Baltic Sea
    aquatic environment
    Źródło:
    Oceanologia; 2014, 56, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecohydrodynamic model of the Baltic Sea. Part 1. Description of the ProDeMo model
    Autorzy:
    Oldakowski, B.
    Kowalewski, M.
    Jedrasik, J.
    Szymelfenig, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49157.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    hydrodynamic-ecological model
    nutrient
    ecohydrodynamic modelling
    biogeochemical process
    subregion
    ProDeMo model
    Baltic ecosystem
    Baltic Sea
    Gdansk Gulf
    Opis:
    The ProDeMo (Production and Destruction of Organic Matter Model), a 3D coupled hydrodynamic-ecological model, was formulated and applied to the whole Baltic Sea and the subregion of the Gulf of Gdańsk. It describes nutrient cycles (phosphorus, nitrogen, silicon) through the food web with 15 state variables, oxygen conditions and the parameterisation of water-sediment interactions. The present version of the model takes two groups of phytoplankton – diatoms and non-diatoms – as well as zooplankton into consideration. It covers the flow of matter and energy in the sea, including river discharges and atmospheric deposition. Numerical applications are embedded on a 1 NMgri d for the Gulf of Gdańsk and a 5 NMgri d for the Baltic Sea. Since the model results largely concur with observations, the model can be regarded as a reliable tool for analysing the behaviour of the Baltic ecosystem. Some examples of the spatial-temporal variability of the most important biological and chemical parameters are presented. The model results are compared with those of other modelling research in the Baltic Sea. Both the ProDeMo model algorithm and its computing procedures need to be further developed. The next version should therefore enable more phytoplankton groups to be defined, for example cyanobacteria, which are able to take up molecular nitrogen from the atmosphere (nitrogen fixation). Additionally, the sediment phase should be divided into active and non-active layers.
    Źródło:
    Oceanologia; 2005, 47, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biogeochemical alteration of the benthic environment by the zebra mussel Dreissena polymorpha (Pallas)
    Autorzy:
    Zaiko, A.
    Paskauskas, R.
    Krevs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47856.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    Curonian Lagoon
    Dreissena polymorpha
    benthic macroinvertebrate
    biogeochemical alteration
    ecosystem
    mineralization
    nitrogen
    nutrient
    oxygen consumption
    phosphorus
    sediment
    shell
    zebra mussel
    Opis:
    The aim of this study was to verify whether the biogeochemical features (e.g. concentration of nutrients, oxygen consumption, mineralization rate, Eh) of sediments changed by the zebra mussel or its shell deposits differ from those in the ambient soft bottom, and how these differences are related to the structure of benthic macroinvertebrates. In 2006 three sampling sessions were carried out in the Curonian Lagoon, SE Baltic Sea, at three pre-defined sites, corresponding to different bottom types: zebra mussel bed, zebra mussel shell deposits and bare soft sediments. Similarity analysis of biogeochemical parameters indicated that bottom sediments covered with zebra mussel shell deposits were rather distinct from the other bottom types because of the lowest total organic matter mineralization rate and highest organic carbon, total phosphorus and total nitrogen content. The parameters measured in the zebra mussel bed did not deviate conspicuously from the values observed in bare bottoms, except for the higher rate of oxygen consumption in the upper sediment layer. Unsuitable anoxic conditions on the one hand and the ‘attractive’ shelters provided by zebra mussels on the other hand may promote the epifaunal life style in the habitats formed by dense zebra mussel clumps.
    Źródło:
    Oceanologia; 2010, 52, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple statistical formulas for estimating biogeochemical properties of suspended particulate matter in the Southern Baltic Sea potentially useful for optical remote sensing applications
    Autorzy:
    Wozniak, S.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/47701.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biogeochemical property
    suspended particulate matter
    particulate organic carbon
    inherent optical property
    chlorophyll a
    light absorption
    backscattering coefficient
    remote sensing
    Baltic Sea
    Źródło:
    Oceanologia; 2014, 56, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the parametrization of water optical properties on the modelled sea surface temperature in the Baltic Sea
    Autorzy:
    Stramska, M.
    Zuzewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/49070.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    sea surface temperature
    parametrization
    optical property
    water column
    biogeochemical modelling
    light propagation
    vertical distribution
    spectral range
    photosynthetically available radiation
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processes regulating pCO2 in the surface waters of the Central Eastern Gotland Sea: a model study
    Autorzy:
    Kuznetsov, I.
    Neumann, T.
    Schneider, B.
    Yakushev, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48971.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    biogeochemical modelling
    brackish water
    carbon dioxide
    Cyanoprokaryota
    detritus
    ecological status
    ecosystem
    ERGOM model
    nitrogen fixation
    seasonal change
    surface water
    water exchange
    Opis:
    This work presents a one-dimensional simulation of the seasonal changes in CO2 partial pressure (pCO2). The results of the model were constrained using data from observations, which improved the model’s ability to estimate nitrogen fixation in the central Baltic Sea and allowed the impact of nitrogen fixation on the ecological state of the Baltic Sea to be studied. The model used here is the public domain water-column model GOTM (General Ocean Turbulence Model), which in this study was coupled with a modifed Baltic Sea ecosystem model, ERGOM (The Baltic Sea Research Institute’s ecosystem model). To estimate nitrogen fixation rates in the Gotland Sea, the ERGOM model was modified by including an additional cyanobacteria group able to fix nitrogen from March to June. Furthermore, the model was extended by a simple CO2 cycle. Variable C:P and N:P ratios, controlled by phosphate concentrations in ambient water, were used to represent cyanobacteria, detritus and sediment detritus. This approach improved the model’s ability to reproduce sea-surface phosphate and pCO2 dynamics. The resulting nitrogen fixation rates in 2005 for the two simulations, with and without the additional cyanobacteria group, were 259 and 278 mmol N m−2 year−1 respectively.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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