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Wyszukujesz frazę "optical depth" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Conditions influencing incoming global solar radiation in Hornsund (Spitsbergen) in spring 2015
    Autorzy:
    Uscka-Kowalkowska, Joanna
    Przybylak, Rajmund
    Markowicz, Krzysztof M.
    Araźny, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2042154.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aerosol optical depth
    Arctic
    cloudiness
    global solar radiation
    Spitsbergen
    sunshine duration
    Źródło:
    Polish Polar Research; 2017, 38, 3; 333-349
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aerosol Optical Depth variations due to local breeze circulation in Kongsfjorden, Spitsbergen
    Autorzy:
    Cisek, M.
    Petelski, T.
    Zielinski, T.
    Makuch, P.
    Pakszys, P.
    Rozwadowska, A.
    Markuszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/47662.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    aerosol optical depth
    aerosol
    modification
    Arctic region
    Kongsfjorden
    breeze circulation
    wind speed
    Spitsbergen
    Opis:
    This paper presents the results of Aerosol Optical Depth (AOD) studies which took place in Ny-Ålesund in the spring of 2014 during the iAREA campaign. The measurements were taken using Microtops II hand-held sunphotometers along the Kongsfjorden, on a path leading from the research village to the fjord opening. Local breeze circulation was observed during the measurement campaign which resulted in an evident increase of AOD along the measurement profile towards the open sea. Using the observed AOD, changes over the open sea have been calculated and the location of the breeze front has been determined.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability of the portion of functional PS2 reaction centres in the light of a fluorometric study
    Autorzy:
    Ficek, D.
    Ostrowska, M.
    Kuzio, M.
    Pogosyan, S.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/48365.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine phytoplankton
    variability
    quantum yield
    chlorophyll a
    optical depth
    PS2 reaction
    environmental factor
    photosynthetic apparatus
    sea
    fluorometric method
    light
    photosynthesis
    Opis:
    The paper contains a preliminary analysis of the links between the portion fc of functional PS2 reaction centres in the photosynthetic apparatus of marine phytoplankton and environmental factors. The analysis is based inter alia on fluorometric measurements of fc (see Kolber & Falkowski 1993) in water sampled from different depths and trophic types of sea. From the statistical generalisations was derived an analytical form of the relationship between fc, and the optical depth and trophic type of sea (the trophicity index was taken to be the surface concentration of chlorophyll a). According to this relationship, fc rises as the trophicity of the sea does so. Moreover, there is a certain optimal optical depth for each type of water at which the number of functional PS2 reaction centres reaches a maximum. Above or below this depth the value of fc falls. At the present stage of investigations it seems reasonable to assume that this drop in the number of functional PS2 reaction centres close to the surface is due to the destructive effect of excessive irradiance. On the other hand, their reduced number at greater depths, below the fc maximum, can be attributed to the deficit of light and the consequent destruction of reaction centres.
    Źródło:
    Oceanologia; 2000, 42, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical description of vertical algal accessory pigment distributions in oceans – a brief presentation
    Autorzy:
    Majchrowski, R.
    Ostrowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49083.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    accessory pigment
    bio-optical modelling
    chlorophyll a
    concentration
    investigation
    marine alga
    mathematical description
    ocean
    optical depth
    photoprotecting pigment
    photosynthetic apparatus
    photosynthetic pigment
    pigment
    sea
    trophic index
    vertical distribution
    water
    Opis:
    A straightforward mathematical expression for describing the vertical distributions of algal accessory pigments in oceans is presented. To this end ca 1500 empirical datasets of accessory pigment depth profiles gathered during some 200 research cruises in different oceanic regions were analysed. These data were retrieved from the bio-optical databases of SeaBASS and U.S. JGOFS published on the Internet. The statistical relationships were analysed between the concentrations of accessory pigments and the trophic indices of waters, as measured by the surface concentrations of chlorophyll a and the optical depths in different oceanic regions. A mathematical expression was established and formulas based on it were found, approximating the relations between the vertical distributions of accessory pigments and the chlorophyll a concentration. These formulas can be used to model the species composition of algae in different parts of the ocean and in remote sensing algorithms.
    Źródło:
    Oceanologia; 2009, 51, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of the in vivo spectral absorption of algal pigments. Part 2. Practical applications of the model
    Autorzy:
    Majchrowski, R.
    Wozniak, B.
    Dera, J.
    Ficek, D.
    Kaczmarek, S.
    Ostrowska, M.
    Koblentz-Mishke, O.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/48872.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    practical application
    bio-optical modelling
    depth
    algal pigment
    in vivo
    sea
    statistical model
    phytoplankton
    light absorption
    Opis:
    The article describes applications and accuracy analyses of a statistical model of light absorption by phytoplankton that accounts for the influence of photo- and chromatic acclimation on its absorption properties. Part 1 of this work (seeWoźniak et al. 2000, this volume) describes the mathematical apparatus of the model. Earlier models by Woźniak & Ostrowska (1990) and by Bricaud et al. (1995, 1998) are analysed for comparison. Empirical verification of these three models shows that the new model provides a much better approximation of phytoplankton absorption properties than do the earlier models. The statistical errors in estimating the mean absorption coefficient apl, for example, are σ+ = 36% for the new model, whereas for the earlier models the figures are σ+ = 43% (Bricaud et al. 1995, 1998) and σ+ = 59% (Woźniak & Ostrowska 1990). Example applications are given of the new model illustrating the variability in phytoplankton absorption properties with depth and trophicity of the sea.
    Źródło:
    Oceanologia; 2000, 42, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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