Particle Size Distributions from Angular Variation of Intensity of Forward-Scattered Light at Very Small Angles

Chin, J. H.; Sliepcevich, C. M.; Tribus, Major Brian

doi:10.1021/j150531a010

Cited by 69 publications

(18 citation statements)

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“…For example, the backscattering ratio (fraction of scattered light into the backward directions) has been used to infer the bulk refractive index of particles Boss et al, 2004). Measurements of VSFs at near forward angles, from commercial instruments, have been used to derive the size distribution of larger particles (∼ 2 to 200 µm) (Chin et al, 1955;Coston and George, 1991;Knight et al, 1991;Riley and Agrawal, 1991). Building on earlier studies (Gordon and Brown, 1972;Zaneveld et al, 1974), Zhang et al (2011) developed an inversion method that uses the full angular range of VSFs to retrieve the size and composition of particles.…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical origins of particles obtained from the inversion of the volume scattering function and spectral absorption in coastal waters

et al. 2013

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Abstract. In the aquatic environment, particles can be broadly separated into phytoplankton (PHY), non-algal particle (NAP) and dissolved (or very small particle, VSP) fractions. Typically, absorption spectra are inverted to quantify these fractions, but volume scattering functions (VSFs) can also be used. Both absorption spectra and VSFs were used to estimate particle fractions for an experiment in the Chesapeake Bay. A complete set of water inherent optical properties was measured using a suite of commercial instruments and a prototype Multispectral Volume Scattering Meter (MVSM); the chlorophyll concentration, [Chl] was determined using the HPLC method. The total scattering coefficient measured by an ac-s and the VSF at a few backward angles measured by a HydroScat-6 and an ECO-VSF agreed with the LISST and MVSM data within 5%, thus indicating inter-instrument consistency. The size distribution and scattering parameters for PHY, NAP and VSP were inverted from measured VSFs. For the absorption inversion, the "dissolved" absorption spectra were measured for filtrate passing through a 0.2 μm filter, whereas [Chl] and NAP absorption spectra were inverted from the particulate fraction. Even though the total scattering coefficient showed no correlation with [Chl], estimates of [Chl] from the VSF-inversion agreed well with the HPLC measurements (r = 0.68, mean relative errors = −20%). The scattering associated with NAP and VSP both correlated well with the NAP and "dissolved" absorption coefficients, respectively. While NAP dominated forward, and hence total, scattering, our results also suggest that the scattering by VSP was far from negligible and dominated backscattering. Since the sizes of VSP range from 0.02 to 0.2 μm, covering (a portion of) the operationally defined "dissolved" matter, the typical assumption that colored dissolved organic matter (i.e., CDOM) does not scatter may not hold, particularly in a coastal or estuarine environment.

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Section: Introductionmentioning

confidence: 99%

Biogeochemical origins of particles obtained from the inversion of the volume scattering function and spectral absorption in coastal waters

et al. 2013

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“…Methods for finding the size distribution from turbidity measurements at different wavelengths were developed by Wallach et al (1961) and Curcio (1961). Chin et al (1955Chin et al ( , 1955a gave a method of finding size distribution based on the angular variation of the scattered light at very small angles. Experimental data on scattering of fogs has been summarized by Spencer (1960).…”

Section: Static Light Scatteringmentioning

confidence: 99%

Static and dynamic light scattering by aerosols in a controlled environment

Singh

2009

Light Scattering Reviews 4

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“…Si les particules sont sphériques, la formule de Bouguer-Beer permet de relier la granulométrie de la dispersion à la répartition de l'intensité lumineuse sur la figure de diffraction [8]. Toute la difficulté réside dans la mesure de cette répartition : on peut, soit disposer un diaphragme variable devant un photorécepteur, soit utiliser un micro-densitomètre se déplaçant dans le plan focal.…”

Section: Méthode De Diffraction à L'infiniunclassified

Aspects diphasiques des échanges particulaires à l'interface air-mer

Resch

Avellan

1978

La Houille Blanche

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Particle Size Distributions from Angular Variation of Intensity of Forward-Scattered Light at Very Small Angles

Cited by 69 publications

References 0 publications

Biogeochemical origins of particles obtained from the inversion of the volume scattering function and spectral absorption in coastal waters

Biogeochemical origins of particles obtained from the inversion of the volume scattering function and spectral absorption in coastal waters

Static and dynamic light scattering by aerosols in a controlled environment

Aspects diphasiques des échanges particulaires à l'interface air-mer

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