Truncation and Angular-Scattering Corrections for Absorbing Aerosol in the TSI 3563 Nephelometer

Bond, Tami C.; Covert, David S.; Müller, Thomas

doi:10.1080/02786820902998373

Cited by 65 publications

(104 citation statements)

References 26 publications

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“…While this could imply that a wavelength-dependent correction is required, an examination of SSA across each mirror wavelength range ( Figure S4, above and below 580 nm) reveals that this is not necessary within each set of experiments. Accurate broadband measurements of aerosol optical properties over the entire solar spectrum are technologically challenging (Ramanathan and Carmichael 2008;Bond et al 2009Bond et al , 2013. We conclude that other cavityenhanced techniques, where a broadband light source is used in a wavelength-resolved (Washenfelder et al 2013) or unresolved (LED-based) manner, do not need a wavelength-dependent correction to reconcile scattering and extinction.…”

Section: The Nephelometermentioning

confidence: 94%

“…While Mishchenko et al (2004) suggested an SSA accuracy of 0.03, Bond et al (2009) argue that an accuracy of 0.02 is required. Given that SSA is limited to values ≤1, an accuracy of ≤2% is extremely challenging for a factor that relies on multiple measurement techniques.…”

Section: Ssa Ab and Absorbing Pslmentioning

confidence: 99%

“…Since there is no error in the extrapolated cross-sections (due to extrapolating between two data points with two variables), error only stems from the variability of the nephelometer (1%), the uncertainty of the correction factor (1%, see Bond et al 2009), and the CPC error (10%). This results in a scattering coefficient error (s(α scat )) of 1.4% and a scattering cross-section error (s(σ scat )) of 10.1% at one standard deviation.…”

Section: The Nephelometermentioning

confidence: 99%

“…In a recent assessment, Bond et al (2009) discuss the underpinnings of the A&O correction and its limits. The reason that the truncation correction C(λ) A&O exhibits anå scat dependence is because they are both linked to particle size.…”

Section: The Nephelometermentioning

confidence: 99%

“…Since Mie calculations are not linear, the resulting ranges are not even about the mean. No attempt was made to modify these calculated values to reflect any particle size distribution since it is not entirely known, though some schemes for incorporating particle size distributions have been developed (Bond et al 2009).…”

Section: Psl Particle Comparison: Crds Nephelometery Mie Theorymentioning

confidence: 99%

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Error Analysis and Uncertainty in the Determination of Aerosol Optical Properties Using Cavity Ring-Down Spectroscopy, Integrating Nephelometry, and the Extinction-Minus-Scattering Method

Singh

Fiddler

Smith

et al. 2014

Aerosol Science and Technology

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Despite the substantial improvements in the measurements of aerosol physical and chemical properties and in the direct and indirect radiative effects of aerosols, there is still a need for studying the properties of aerosols under controlled laboratory conditions to develop a mechanistic and quantitative understanding of aerosol formation, chemistry, and dynamics. In this work, we present the factors that affect measurement accuracy and the resulting uncertainties of the extinction-minus-scattering method using a combination of cavity ring-down spectroscopy (CRDS) and integrating nephelometry at a wider range of optical wavelengths than previously attempted. Purely scattering polystyrene latex (PSL) spheres with diameters from 107-303 nm and absorbing polystyrene spheres (APSL) with 390 nm diameter were used to determine the consistency and agreement, within experimental uncertainties, of CRDS and nephelometer values with theoretical calculations derived from Mie theory for non-absorbing spheres. Overall uncertainties for extinction cross-section were largely 10%-11% and dominated by condensation particle counter (CPC) measurement error. Two methods for determining σ ext error are described, and they were found to produce equivalent results. Systematic uncertainties due to particle losses, RD cell geometry (R L ), CPC counting efficiency, ring-down regression fitting, blank drift, optical tweezing, and recapturing of forward scattered light are also investigated. The random error observed in this work for absorbing spheres is comparable to previous reported measurements. For both absorbing and non-absorbing spheres, a statistical framework is developed for including the contributions to random error due to CPC measurement uncertainty, R L , statistical fluctuations in

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Section: The Nephelometermentioning

confidence: 94%

Section: Ssa Ab and Absorbing Pslmentioning

confidence: 99%

Section: The Nephelometermentioning

confidence: 99%

Section: The Nephelometermentioning

confidence: 99%

Section: Psl Particle Comparison: Crds Nephelometery Mie Theorymentioning

confidence: 99%

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Error Analysis and Uncertainty in the Determination of Aerosol Optical Properties Using Cavity Ring-Down Spectroscopy, Integrating Nephelometry, and the Extinction-Minus-Scattering Method

Singh

Fiddler

Smith

et al. 2014

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

References

2013

Airborne Measurements for Environmental Research

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Novel optical techniques for measurements of light extinction, scattering and absorption by single aerosol particles

Miles¹,

Carruthers²,

Reid³

2011

Laser & Photonics Reviews

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Aerosol particles play important roles in a broad range of scientific disciplines, from atmospheric chemistry and physics, to the delivery of fuels for combustion and drugs to the lungs, and extending to industrial processes such as spray drying. Measurements of the light extinction, scattering and absorption by ensembles of aerosol particles can be used to non-intrusively characterise aerosol particle samples. However, such measurements often lead to ambiguity in interpreting the properties and processes occurring on individual particles. In this review, recent developments in the use of laser based techniques to isolate and manipulate single particles and to characterise them will be highlighted. In particular, the use of cavity ring down spectroscopy, Bessel beams and optical tweezers for investigating light extinction, scattering and absorption, respectively, will be considered. The prospects for using optical techniques to interrogate the fundamental processes occurring in aerosol at the single particle level are discussed.

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Truncation and Angular-Scattering Corrections for Absorbing Aerosol in the TSI 3563 Nephelometer

Cited by 65 publications

References 26 publications

Error Analysis and Uncertainty in the Determination of Aerosol Optical Properties Using Cavity Ring-Down Spectroscopy, Integrating Nephelometry, and the Extinction-Minus-Scattering Method

Error Analysis and Uncertainty in the Determination of Aerosol Optical Properties Using Cavity Ring-Down Spectroscopy, Integrating Nephelometry, and the Extinction-Minus-Scattering Method

References

Novel optical techniques for measurements of light extinction, scattering and absorption by single aerosol particles

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