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    Wyświetlanie 1-3 z 3
    Tytuł:
    Inherent optical properties and remote sensing reflectance of Pomeranian lakes (Poland)
    Autorzy:
    Ficek, D.
    Meler, J.
    Zapadka, T.
    Wozniak, B.
    Dera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48177.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    light absorption
    light scattering
    remote sensing
    inherent optical property
    optically active component
    coloured dissolved organic matter
    suspended particulate matter
    phytoplankton pigment
    chlorophyll a
    Pomeranian lake
    Polska
    Lake Wdzydze
    Źródło:
    Oceanologia; 2012, 54, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revisiting the role of oceanic phase function in remote sensing reflectance
    Autorzy:
    Freda, W.
    Piskozub, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48003.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine optics
    remote sensing
    scattering
    backscattering
    volume scattering function
    angular variation
    scattering light intensity
    inherent optical property
    sea surface
    solar radiation
    angular distribution
    Opis:
    The effect of angular structure differences between measured and best-fit analytical phase functions of the equivalent backscattering ratio on calculated reflectance values was studied and shown to be significant. We used a Monte Carlo radiative transfer code to check the effect of choosing different analytical (several Fournier- Forand (1994) and Henyey-Greenstein (1941)) phase functions with backscattering ratios identical to the ‘classical’ average Petzold function. We show that the additional variability of the resulting water leaving radiance is about 7% (4% between the Fournier-Forand functions themselves) for most scenarios. We also show a previously unknown maximum of the discrepancy (up to 10%) for highly scattering waters. We discuss the importance of relative differences in phase function for different angular ranges to this maximum and to the behaviour of the discrepancy as a function of solar zenith angle.
    Źródło:
    Oceanologia; 2012, 54, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inherent optical properties of suspended particulate matter in the Southern Baltic Sea
    Autorzy:
    Wozniak, S.B.
    Meller, J.
    Lednicka, B.
    Zdun, A.
    Ston-Egiert, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48001.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    chlorophyll a
    coastal water
    Gdansk Gulf
    inherent optical property
    light absorption
    optical property
    particulate organic carbon
    particulate organic matter
    phytoplankton
    scattering
    surface water
    suspended particulate matter
    Opis:
    The inherent optical properties (IOPs) of suspended particulate matter and their relations with the main biogeochemical characteristics of particles have been examined in the surface waters of the southern Baltic Sea. The empirical data were gathered at over 300 stations in open Baltic Sea waters as well as in the coastal waters of the Gulf of Gdańsk. The measurements included IOPs such as the absorption coefficient of particles, absorption coefficient of phytoplankton, scattering and backscattering coefficients of particles, as well as biogeochemical characteristics of suspended matter such as concentrations of suspended particulate matter (SPM), particulate organic matter (POM), particulate organic carbon (POC) and chlorophyll a (Chl a). Our data documented the very extensive variability in the study area of particle concentration measures and IOPs (up to two orders of magnitude). Although most of the particle populations encoun- tered were composed primarily of organic matter (av. POM/SPM=ca 0.8), the different particle concentration ratios suggest that the particle composition varied significantly. The relations between the optical properties and biogeochemical parameters of suspended matter were examined. We found significant variability in the constituent-specific IOPs (coefficients of variation (CVs) of at least 30% to 40%, usually more than 50%). Simple best-fit relations between any given IOP versus any constituent concentration parameter also highlighted the significant statistical errors involved. As a result, we conclude that for southern Baltic samples an easy yet precise quantification of particle IOPs in terms of the concentration of only one of the following parameters – SPM, POM, POC or Chl a – is not achievable. Nevertheless, we present a set of best statistical formulas for a rough estimate of certain seawater constituent concentrations based on relatively easily measurable values of seawater IOPs. These equations can be implemented in practice, but their application will inevitably entail effective statistical errors of estimation of the order of 50% or more.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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