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Spectral dependence of the correlation between the backscattering coefficient and the volume scattering function measured in the Southern Baltic Sea

100%

Freda W.

Oceanologia

2012

tom 54

nr 3

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.

Revisiting the role of oceanic phase function in remote sensing reflectance

67%

Freda W., Piskozub J.

Oceanologia

2012

tom 54

nr 1

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.

Ograniczanie wyników

2 Oceanologia

2 Freda W.

1 Piskozub J.

2 2012

Wyniki wyszukiwania

Spectral dependence of the correlation between the backscattering coefficient and the volume scattering function measured in the Southern Baltic Sea

Revisiting the role of oceanic phase function in remote sensing reflectance