Optical scattering properties of phytoplankton: Measurements and comparison of various species at scattering angles between 1° and 170°

Zugger, Michael E.; Messmer, Alicia; Kane, Timothy J.; Prentice, Jennifer; Concannon, Brian; Laux, Alan; Mullen, Linda

doi:10.4319/lo.2008.53.1.0381

Cited by 25 publications

(9 citation statements)

References 18 publications

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“…In recent years, several studies have investigated the scattering and backscattering properties of particles [ Chami et al , 2006; Bowers and Binding , 2006; Loisel et al , 2006, 2007; Whitmire et al , 2007; Snyder et al , 2008] and phytoplankton [ Vaillancourt et al , 2004; Dupouy et al , 2008; Zugger et al , 2008] in oceanic and coastal waters, but a more in‐depth knowledge of their spectral behavior is still needed. Estuarine and coastal waters are characterized by much higher scattering than open waters because of their higher concentration in particles, whether organic (phytoplankton) or mineral.…”

Section: Resultsmentioning

confidence: 99%

Bio‐optical variability of the absorption and scattering properties of the Queensland inshore and reef waters, Australia

et al. 2009

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[1] Inshore estuarine, lagoonal, and reef waters of the Great Barrier Reef (Australia) were sampled between 2002 and 2005 during four dry and one wet tropical seasons. Relationships among three biogeochemical concentrations and five key water optical parameters measured at 129 stations were explored to optically characterize six predefined regions. A significant spatial and seasonal variability in some of the inherent optical properties and concentrations measured was found, reaching over two orders of magnitude in the estuaries. Total suspended solids concentrations ranged from 0.5 to $54 mg L À1 , TChl-a ranged from 0.05 to $9 mg m À3 , color dissolved organic matter (CDOM) ranged from 0.004 to 0.8 m À1 at 440 nm, and the backscattering coefficient ranged from 0.001 to 1.18 m À1 at 555 nm. Our data set was mainly composed of coastal stations (95%), leading to a poor correlation between the three concentrations (R 2 < 0.31). The range of variation in backscattering ratios, power law exponents, and the spectral slopes of CDOM and nonalgal particulate matter is comparable with findings from other coastal and open waters around the world. The empirical relationships between TChl-a and a ph (440) were found to differ from reference models, indicating differences in phytoplankton size structure and populations. High variability in backscattering ratios and associated power law exponents as well as particulate absorption ratios indicated different trends or relationships in particle size and composition between the different regions. Stations close to the reef matrix showed specific characteristics with concentrations typical of oceanic waters but CDOM spectral slopes similar to those of coastal environments.

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Section: Resultsmentioning

confidence: 99%

Bio‐optical variability of the absorption and scattering properties of the Queensland inshore and reef waters, Australia

et al. 2009

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“…2d) are not present in natural samples due to the polydispersity and non-spherical nature of the cells. Scattering strength can vary up to five orders of magnitude between the small and medium angles (Kandilian et al 2016;Svensen et al 2007;Zugger et al 2008). The backscattering ratio of algal cells, a quantity of special importance in remote sensing, is typically < 3 % and often two or three orders of magnitude lower than the total scattered light (Ahn et al 1992;Vaillancourt et al 2004;Whitmire et al 2010).…”

Section: Optics Of Cell Suspensionsmentioning

confidence: 99%

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Lehmuskero

Chauton

Boström

2018

Progress in Oceanography

100

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“…In the past decades, measurements of the VSF for natural or phytoplankton cultures samples were scant [9,10]. Recently, new instruments using the last advances in optical technology have been developed to compensate for the lack of such important optical data [6,7,[11][12][13][14][15][16][17][18][19]. Those instruments rely on different concepts and designs that inherently include different types of artifacts and error sources.…”

Section: Introductionmentioning

confidence: 99%

Laboratory experiments for inter-comparison of three volume scattering meters to measure angular scattering properties of hydrosols

Harmel¹,

Hieronymi²,

Slade³

et al. 2015

Opt. Express

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Measurements of the volume scattering function (VSF) of hydrosols is of primary importance to investigate the interaction of light with hydrosols and to further interpret in situ and remote sensing data of ocean color. In this paper, a laboratory inter-comparison experiment of three recently developed VSF meters that are able to measure the scattered light for a wide range of scattering angle at 515 nm wavelength is performed using phytoplankton cultures and mineral-like hydrosols. A rigorous measurement protocol was employed to ensure good quality data. In particular, the protocol enabled removing the influence of bacteria on the hydrosols within the sample. The differences in the VSF measurements between the instruments vary from 10 to 25% depending on the composition of the hydrosols. The analysis of the angular features of the VSF revealed a sharp increase of the VSF beyond the scattering angle of 150° for some phytoplankton species. Such behavior is observed for two of the three VSF meters, thus suggesting that it is not due to instrumental artifacts but more likely to phytoplankton optical properties themselves. Moreover, comparisons with currently used theoretical phase functions show that the models are not able to reproduce satisfactorily the directional patterns in the backscattering region. This study suggests that a better modelling of the VSF shape of phytoplankton at high scattering angles is required to correctly represent the angular shape of the VSF in the backscattering hemisphere. Tabulated values of the measured phase functions are provided for scattering angles from 0.1 to 175°.

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Optical scattering properties of phytoplankton: Measurements and comparison of various species at scattering angles between 1° and 170°

Cited by 25 publications

References 18 publications

Bio‐optical variability of the absorption and scattering properties of the Queensland inshore and reef waters, Australia

Bio‐optical variability of the absorption and scattering properties of the Queensland inshore and reef waters, Australia

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Laboratory experiments for inter-comparison of three volume scattering meters to measure angular scattering properties of hydrosols

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