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    Wyświetlanie 1-9 z 9
    Tytuł:
    Parameterization of light scattering for solving the inverse problem of determining the concentrations of the principal light scattering and absorbing admixtures in shelf waters
    Autorzy:
    Pelevin, V.N.
    Rostovtseva, V.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/48226.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    bio-optical modelling
    backscattering
    sea water
    shelf water
    light absorption
    irradiance
    Opis:
    A method for estimating the water backscattering coefficient was put forward on the basis of experimental data of diffuse attenuation coefficient for downwelling irradiance and irradiance reflectance. Calculations were carried out for open sea waters of different types and the spectral dependencies were found (‘anomalous’ spectra) and explained. On this basis, a new model of light backscattering on particles in the sea is proposed. This model may be useful for modelling remote sensing reflectance spectra in order to solve the inverse problems of estimating the concentration of natural admixtures in shelf waters.
    Źródło:
    Oceanologia; 2001, 43, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some probabilistic properties of surf parameter
    Autorzy:
    Myrhaug, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079192.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    probabilistic property
    surf parameter
    wave statistics
    continental shelf
    coastal zone
    Norway
    Opis:
    This article is supplementary to Myrhaug (2018) and presents some probabilistic properties of the surf parameter for individual waves and the spectral surf parameter for sea states by using distributions based on data from the Norwegian continental shelf. The average statistical features given by the mean value and the standard deviation of the two surf parameters are considered. Examples of results for the surf parameter are provided for a Phillips spectrum and a family of JONSWAP spectra for wind sea, and for sea states using a joint frequency table of significant wave height and mean zero-crossing wave period for combined wind sea and swell. The spectral surf parameter results are obtained by using a joint distribution of significant wave height and spectral surf parameter, and the mean statistical properties are given for joint frequency tables of significant wave height and mean zero-crossing wave period from three deep water locations on the Norwegian continental shelf. It is also demonstrated how the results can be applied to calculate the vertical wave runup elevation for breaking waves.
    Źródło:
    Oceanologia; 2020, 62, 3; 395-401
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Live autochthonous benthic diatoms on the lower depths of Arctic continental shelf. Preliminary results
    Autorzy:
    Druzhkova, E.
    Oleinik, A.
    Makarevich, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/48499.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    diatom
    microphytobenthos
    sediment layer
    Barents Sea
    microalga
    Gyrosigma fasciola
    Pleurosigma angulatum
    water column
    continental shelf
    Arctic
    Opis:
    An autochthonous community of benthic diatoms was discovered in June 2015 in the upper sediment layer at depths of 170, 205, and 245 m in the central Barents Sea. At least three benthic microalgae species (Gyrosigma fasciola, Pleurosigma angulatum, and Pleurosigma sp. 1) were detected in the sediment but not the upper water column. Analyses revealed that these benthic microalgae represent a depleted fragment of Arctic littoral microphytobenthos. Compared with the littoral flora, the deep-water assemblage is less diverse and displays low abundance. The data reported here challenge the generally accepted belief that the presence of certain microalgae at significant depths results from vertical or horizontal transfer.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling flow in the porous bottom of the Barents Sea shelf
    Autorzy:
    Massel, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48663.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    porous medium
    surface wave
    tide
    Barents Sea
    shelf
    organic carbon
    water transport
    water flow
    meteorological condition
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Climate of long internal waves and resuspension on the coastal shelf
    Autorzy:
    Bogucki, D.J.
    Redekopp, L.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/47452.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    boundary layer
    internal wave
    turbulence
    resuspension
    long internal wave
    internal solitary wave
    coastal shelf
    instability
    climate
    coastal area
    Opis:
    Observations of the shelf environment rarely associate internal solitary waves (ISWs) with the impact of their passage. An experiment observed during the Coastal Mixing and Optics 1996( CMO ’96), a sequence of long internal waves on a coastal shelf is reported, including both mode-1 and mode-2 waves, together with evidence related to the interaction of propagating ISWs and the benthic boundary layer. The observed ISW dynamics is shown to present a repetitive pattern or ‘climate cycle’. The ISW-associated benthic signature described here occurs frequently (at least once a day) in the CMO ’96coastal area and suggests that ISWs under calm, summer-like conditions may have a decisive influence on the fate of near-bottom pollutants or biological processes in shelf regions.
    Źródło:
    Oceanologia; 2008, 50, 1; 5-21
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The progress in knowledge of physical oceanography of the Gulf of Finland: e review for 1997-2007
    Autorzy:
    Soomere, T.
    Myrberg, K.
    Lepparanta, M.
    Nekrasov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47626.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea ice
    hydrography
    physical oceanography
    European shelf sea
    Baltic Sea
    wave
    circulation
    Finland Gulf
    marine optics
    sea level
    Opis:
    The main findings of studies of the physical oceanography of the Gulf of Finland (GoF) during 1997–2007 are reviewed. The aim is to discuss relevant updates published in international peer-reviewed research papers and monographs, bearing in mind that a comprehensive overview of the studies up to the mid-1990s is available (Alenius et al. 1998). We start the discussion with updates on the basic hydrographical and stratification conditions, and progress in the understanding of atmospheric forcing and air-sea interaction. Advances in the knowledge of basinscale and mesoscale dynamics are summarised next. Progress in circulation and water exchange dynamics has been achieved mostly by means of numerical studies. While the basic properties of circulation patterns in the gulf have been known for a century, new characteristics and tools such as water age, renewal index, and high-resolution simulations have substantially enriched our knowledge of processes in the Gulf of Finland during the last decade. We present the first overview of both status and advances in optical studies in this area. Awareness in this discipline has been significantly improved as a result of in situ measurements. Our understanding of the short- and long-term behaviour of the sea level as well as knowledge of the properties of both naturally and anthropogenically induced surface waves have expanded considerably during these ten years. Developments in understanding the ice conditions of the Gulf of Finland complete the overview, together with a short discussion of the gulf’s future, including the response to climate change. Suggestions for future work are outlined.
    Źródło:
    Oceanologia; 2008, 50, 3; 287-362
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal
    Autorzy:
    Das, S.
    Das, I.
    Giri, S.
    Chanda, A.
    Maity, S.
    Lotliker, A.A.
    Kumar, T.S.
    Akhand, A.
    Hazra, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48552.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    chromophoric dissolved organic matter
    absorption coefficient
    sea surface
    salinity
    chlorophyll a
    total suspended matter
    spatio-temporal variability
    Bengal Bay
    continental shelf
    Opis:
    The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.
    Źródło:
    Oceanologia; 2017, 59, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temporal and spatial changes in the bio-optical properties of seawater in the Nordic Seas – AREX’2003 and 2006
    Autorzy:
    Drozdowska, V.
    Paryvkina, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/47895.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Atlantic water
    bio-optical property
    chlorophyll
    fluorescence
    Nordic Sea
    ocean circulation
    organic matter
    oxygen
    phytoplankton
    sea water
    shelf water
    spatial change
    Svalbard Islands
    temporal change
    water mass
    Opis:
    For many years the Nordic Seas have been the subject of research into ocean circulation carried out by the Institute of Oceanology PAS, especially the inflow of Atlantic water and the intensive turbulent mixing of these waters with Arctic and shelf waters. Ocean currents affect various biological processes, among them the supply of organic matter and oxygen, which constitute the foundation for the unique flora and fauna of the Svalbard islands. Spectrophotometric examinations of surface waters using an M32 B spectroflu- orophotometer (LDI Ltd.) were carried out repeatedly during Arctic cruises on board r/v ‘Oceania’. The results presented in this paper come from the AREX campaigns of 2003 and 2006. Analysis of the chlorophyll a fluorescence excitation spectra recorded shows an increase in phytoplankton abundance and the changes in the spatial distribution of the phytoplankton species characteristic of Atlantic, Arctic and shelf waters. The spatial patterns of the phytoplankton pigments and their abundance were compared with the physical characteristics of water masses. The analysis confirmed that phytoplankton species move together with the Atlantic water as this flows into northern latitudes.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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