Wszystkie pola: spectral property - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spectral dependence of the correlation between the backscattering coefficient and the volume scattering function measured in the Southern Baltic Sea
Autorzy:: Freda, W.
Powiązania:: https://bibliotekanauki.pl/articles/47893.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: volume scattering function
backscattering coefficient
marine optics
Baltic Sea
optical property
sea water
spectral variability
Opis:: Direct measurements of the backscattering coefficient bb require the determination of the Volume Scattering Function (VSF) and its integration over a backward hemisphere. In sea water they are difficult and are therefore carried out very rarely. That is why the backscattering coefficient is much more frequently obtained with so-called single angle scattering meters: these operate by measuring the VSF for a fixed angle region of the backward hemisphere. This article examines the spectral variability of the correlation between directly measured backscattering coefficients and VSFs. Also presented are the averaged slopes of VSF spectra, measured in southern Baltic waters over a wide range of scattering angles.
Źródło:: Oceanologia; 2012, 54, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spectral light absorption by yellow substance in the Kattegat-Skagerrak area
Autorzy:: Hojerslev, N.K.
Aas, E.
Powiązania:: https://bibliotekanauki.pl/articles/48244.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: yellow substance
wavelength
spectral slope
coastal water
Kattegat area
absorption coefficient
Scandinavian fjord
Baltic Sea
optical property
Skagerrak area
light absorption
Opis:: More than 1500 water samples were taken from the Kattegat, the Skagerrak and adjacent waters. The value of the absorption coefficient of yellow substance at 310 nm was found to varyf rom 0.06 to 7.4 m−1 in the open coastal waters, with a mean value of 1.3 m−1. The corresponding wavelength-averaged value (250–450 nm) of the semilogarithmic spectral slope of the coefficient ranges from 0.008 to 0.042 nm−1, and the mean value is 0.023 nm−1. Closer to river discharges, as in the fjords, the values of the slope seem to be more constant at around 0.0175±0.0015 nm−1. In this area the slope must then be known in order to compare absorption at different wavelengths or to model the yellow substance absorption.
Źródło:: Oceanologia; 2001, 43, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Spectral effects in bio-optical control on the ocean system
Autorzy:: Sathyendranath, S.
Platt, T.
Powiązania:: https://bibliotekanauki.pl/articles/47462.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: primary production
ocean colour
bio-optical property
remote sensing
ocean ecosystem
phytoplankton
Opis:: The influence of phytoplankton on the spectral structure of the submarine irradiance field is reviewed. The implications for the ocean system of the spectral response by phytoplankton to the ambient light field are discussed. For example, it provides the basis for retrieval of phytoplankton biomass by visible spectral radiometry (ocean-colour remote sensing). In the computation of primary production, the results of spectral models differ in a known and systematic manner from those of non-spectral ones. The bias can be corrected without risk of incurring additional random errors. The models in use for phytoplankton growth, whether based on available light or absorbed light, whether expressed in terms of chlorophyll or carbon, are shown all to conform to the same basic formalism with the same parameters. Residual uncertainty lies less with the models than with the parameters required for their implementation. The submarine light field and the spectral characteristics of phytoplankton carry latent information on phytoplankton community structure. Differences in spectral response by different functional types of phytoplankton are small but significant. Optical considerations limit the maximum phytoplankton biomass that can be sustained in a given surface mixed layer. Moreover, the upper bound on the biomass depends on the spectral response of the dominant phytoplankton taxa. As a result, an optical control exists in the mixed layer that tends to resist extreme excursions of the biomass and also to maintain biodiversity in the phytoplankton.
Źródło:: Oceanologia; 2007, 49, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki