Temat: biogeochemical - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Acid volatile sulphide estimation using spatial sediment covariates in the Eastern Upper Gulf of Thailand: multiple geostatistical approaches
Autorzy:: Chaikaew, P.
Sompongchaiyakul, P.
Powiązania:: https://bibliotekanauki.pl/articles/49001.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: acid volatile sulphide
spatial variability
sediment
marine ecosystem
biogeochemical cycle
kriging
Thailand
Źródło:: Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Experiments on wave motion and suspended sediment concentration at Nang Hai, Can Gio mangrove forest, Southern Vietnam
Autorzy:: Hong Phuoc, V.L.
Massel, S.R.
Powiązania:: https://bibliotekanauki.pl/articles/47937.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: subtropical zone
marine environment
trophodynamic process
Vietnam
mangrove forest
biogeochemical process
concentration
Can Gio area
wave motion
suspended sediment
Opis:: Biogeochemical and trophodynamic processes as well as hydrodynamic factors play a major role in the structure and function of mangrove ecosystems. This study outlines field experiments on wave motion and suspended sediment concentration carried out at Nang Hai, Can Gio mangrove forest, Southern Vietnam. Pressure sensors were used to measure sea surface elevation, and Optical Backscatter Sensors (OBS) were applied to detect infrared (IR) radiation scattered from suspended particles in order to measure turbidity and suspended sediment concentrations. The experimental results indicate that most of the energy is dissipated inside the mangrove forest as a result of wave-trunk interactions and wave breaking. The suspended sediment concentration depends on wave intensity and tidal current velocity. Wave action is one of the main factors forcing sediment transport and coastal erosion at the study site; even the wave field at the study site is not so strong. The establishment of mangrove vegetation can encourage the deposition of sediment, or at least the retention of the flood-tide sediment influx.
Źródło:: Oceanologia; 2006, 48, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effect of drag coefficient formula choice on wind stress climatology in the North Atlantic and the European Arctic
Autorzy:: Wrobel-Niedzwiecka, I.
Drozdowska, V.
Piskozub, J.
Powiązania:: https://bibliotekanauki.pl/articles/48480.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: drag coefficient
parametrization
boundary condition system
wind stress
climatology
physical process
biogeochemical process
European Arctic
North Atlantic
wind field
Źródło:: Oceanologia; 2019, 61, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: PO4 release at the sediment surface under anoxic conditions: a contribution to the eutrophication of the Baltic Sea?
Autorzy:: Schneider, B.
Powiązania:: https://bibliotekanauki.pl/articles/49162.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: anoxia
biogeochemical condition
carbon dioxide
deep water
dissolved inorganic nitrogen
eutrophication
hydrogen sulphide
mineralization
nutrient concentration
oxygen
phosphate
sediment
Opis:: The vertical profiles of phosphate, total CO2 and oxygen/hydrogen sulphide were determined in the deep water of the Gotland Sea during March 2003 to July 2006 with a temporal resolution of 2–3 months. This time span included the shift from anoxic to oxic conditions resulting from a water renewal event, as well as the transition back to anoxic waters during the subsequent two-year stagnation period. The data from depths below 150 m were used to identify and quantify phosphate release and removal processes. The relationship between the total CO2 generated by mineralization (CT1 min) and the PO4 concentrations indicated that the initial decrease in the phosphate concentrations after the inflow of oxygen-rich water was mainly a dilution effect. Only about one third of the PO4 removal was a consequence of the precipitation of insoluble iron-3-hydroxo-phosphates (Fe-P), which occurred slowly at the sediment surface under oxic conditions. From the CT1 min/PO4 ratios it was also concluded that the formation of Fe-P was reversed during the later phase of the stagnation, when the redoxcline approached a depth of 150 m. A phosphate mass balance was performed for four deep water sub-layers in order to quantify the dissolution of Fe-P during the stagnation period and thus to estimate the amount of Fe-P deposited during the last inflow of oxygen-rich water. A value of about 50 mmol-P m−2 was found, which refers to the specific biogeochemical conditions during the change from anoxic to oxic conditions that preceded the stagnation period.
Źródło:: Oceanologia; 2011, 53, (1-TI)
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

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