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    Wyświetlanie 1-3 z 3
    Tytuł:
    Sky glint correction in measurements of upward radiance above the sea surface
    Autorzy:
    Olszewski, J.
    Kowalczuk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/48314.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine optics
    coastal water
    remote sensing
    glint reduction
    ocean water
    sea surface
    Opis:
    An experiment has been performed to determine the upward water-leaving radiance by non-contact measurement of the total upward and downward radiance above the sea surface from a moving ship. The method for achieving this aim is described: the radiance meters are both tilted in such a way that the upward radiance meter can ‘see’ that part of the measured downward radiance which would be reflected if the water surface were smooth and which is not derived directly from solar glitter. Both meters are firmly fixed in a special frame, which ensures that the required orientation is the most probable one. Time records of the measured parameters are analysed. The results are presented in several forms: frequency (histogram) analysis appears to be the most promising one.
    Źródło:
    Oceanologia; 2000, 42, 2
    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:
    SatBaltyk – A Baltic environmental satellite remote sensing system – an ongoing project in Poland. Part 2: Practical applicability and preliminary results
    Autorzy:
    Wozniak, B.
    Bradtke, K.
    Darecki, M.
    Dera, J.
    Dudzinska-Nowak, J.
    Dzierzbicka-Glowacka, L.
    Ficek, D.
    Furmanczyk, K.
    Kowalewski, M.
    Krezel, A.
    Majchrowski, R.
    Ostrowska, M.
    Paszkuta, M.
    Ston-Egiert, J.
    Stramska, M.
    Zapadka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/48019.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic ecosystem
    Baltic Sea
    energy influx
    irradiance condition
    marine optics
    photosynthesis
    plant community
    Polska
    practical application
    preliminary result
    radiation balance
    remote sensing
    SatBaltyk project
    satellite monitoring
    sea surface
    solar energy
    Opis:
    This paper is the second part of the description of the first stage of the SatBałtyk project’s implementation. Part 1 (Woźniak et al. 2011, in this issue) presents the assumptions and objectives of SatBałtyk and describes the most important stages in the history of our research, which is the foundation of this project. It also discusses the operation and general structure of the SatBałtyk system. Part 2 addresses various aspects of the practical applicability of the SatBałtyk Operational System to Baltic ecosystem monitoring. Examples are given of the Baltic’s characteristics estimated using the preliminary versions of the algorithms in this Operational System. At the current stage of research, these algorithms apply mainly to the characteristics of the solar energy influx and the distribution of this energy among the various processes taking place in the atmosphere-sea system, and also to the radiation balance of the sea surface, the irradiance conditions for photosynthesis and the condition of plant communities in the water, sea surface temperature distributions and some other marine phenomena correlated with this temperature. Monitoring results obtained with these preliminary algorithms are exemplified in the form of distribution maps of selected abiotic parameters of the Baltic, as well as structural and functional characteristics of this ecosystem governed by these parameters in the Baltic’s many basins. The maps cover practically the whole area of the Baltic Sea. Also given are results of preliminary inspections of the accuracy of the magnitudes shown on the maps. In actual fact, the errors of these estimates are relatively small. The further practical application of this set of algorithms (to be gradually made more specific) is therefore entirely justified as the basis of the SatBałtyk system for the effective operational monitoring of the state and functioning of Baltic ecosystems. This article also outlines the plans for extending SatBałtyk to include the recording of the effects and hazards caused by current and expected storm events in the Polish coastal zone.
    Źródło:
    Oceanologia; 2011, 53, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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