A comparative study on effective density, shape factor, and volatile mixing of non-spherical particles using tandem aerodynamic diameter, mobility diameter, and mass measurements

Kazemimanesh, Mohsen; Rahman, M. F.; Duca, Dumitru; Johnson, Tyler J.; Addad, Ahmed; Giannopoulos, G.; Focşa, Cristian; Boies, Adam M.

doi:10.1016/j.jaerosci.2021.105930

Cited by 13 publications

(5 citation statements)

References 68 publications

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“…However, this morphologically simplified model fails to reproduce the optical properties of single BC particles with various fractal parameters, such as the loose BC commonly emitted from diesel exhaust and the compact BC from wood burning. On the one hand, the observed I sca can be corrected by the synchronous observations of TEM and SP2 with clearer morphological and chemical parameters [15,38]. On the other hand, the observation errors of BC aerosols with complex morphologies may be reduced by positioning more detectors at the fixed angular range influenced insignificantly by the BC modeling with the particle morphological simplification.…”

Section: Climate Implicationmentioning

confidence: 99%

Particle size amplification of black carbon by scattering measurement due to morphology diversity

Cheng

Zheng

et al. 2023

Environ. Res. Lett.

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Black carbon (BC) is an important aerosol species due to its strong heating to the atmosphere accompanied by cooling to the Earth’s surface, but its radiative forcing is poorly constrained by different regional size distributions because of uncertain reproductions of a morphologically simplified model. Here, we quantify BC morphological effect on measuring particle size using an aggregate model. We show that size distributions of loose BC particles could account for up to 45% underestimated by morphological simplification, leading to up to 25% differences by relying on the simplified model in estimating radiative forcing. We find that BC particle size is remarkably amplified for those looser and larger BC aggregates by angular scattering observations. We suggest that BC morphological diversity can be neglected in forward scattering angles (<30°), which is a useful supplement to reduce the uncertainty of radiative forcing assessment.

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Section: Climate Implicationmentioning

confidence: 99%

Particle size amplification of black carbon by scattering measurement due to morphology diversity

Cheng

Zheng

et al. 2023

Environ. Res. Lett.

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“…An observable particle-size measure of each BC aggregate depends on the measurement principle and procedure due to the non-spherical particle shape and internal mixing with other components (Kasper 1982;McMurry et al 2002;Slowik et al 2004;Kazemimanesh et al 2022). BC aggregates change their original lacy shape to be more compact in the atmosphere as they experience collapsing through their aging and cloud processing (Bhandari et al 2019).…”

Section: Backgroundsmentioning

confidence: 99%

Climate-relevant properties of black carbon aerosols revealed by in situ measurements: a review

Moteki

2023

Prog Earth Planet Sci

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Light-absorbing aerosols affect atmospheric radiation, dynamics, and precipitations through shortwave absorption in the atmosphere and snowpack. Black carbon (BC) is considered the most significant contributor to global shortwave absorption among all the known light-absorbing aerosol components. In analyses and predictions of BC’s lifecycle and climate effects, multiscale field observations are needed to test the fundamental assumptions in the climate model. In situ measurements, the focus of this review, fill the gap of observational information accessible from remote sensing and laboratory analyses. This article reviews historical backgrounds, recent advances in in situ measurements of BC, and the resulting observational findings used to update the assumptions in climate models and remote sensing. Finally, we raise open problems that demand a rethinking and future investigation.Illustrating the physical principle of detecting the light-absorbing black carbon and iron oxides aerosol particles using the single-particle laser-induced incandescence

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“…Measuring solely with an AAC will avoid multiple charging. However, aspherical particles with different mass can be selected by the AAC as having identical aerodynamic diameter (Kazemimanesh et al, 2022). According to Eq.…”

Section: Dma-aacmentioning

confidence: 99%

“…The advantage of utilizing an AAC is that the charge state of the particles does not need to be known in particle classification compared with the aforementioned classifiers; hence, multiple charging effects can be avoided (Tavakoli and Olfert, 2013). However, the selected particles are not monodispersed in mobility diameter when an AAC is used to select aspherical particles (Kazemimanesh et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Morphology information, such as effective density (ρ eff ), mass-mobility exponent (D fm ) and dynamic shape factor (χ ), can be inferred using tandem DMA-PMA (Park et al, 2003;Zhang et al, 2008;Rissler et al, 2013;Pei et al, 2018;Zangmeister et al, 2018), DMA-AAC (Tavakoli and Olfert, 2014) and AAC-CPMA systems (Kazemimanesh et al, 2022). The derived ρ eff and χ depend upon the combination of instruments used, while the nonphysical values of χ and ρ eff for aspherical particles can be determined by the AAC-APM (Yao et al, 2020) and AAC-CPMA (Kazemimanesh et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

et al. 2022

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Abstract. Accurate particle classification plays a vital role in aerosol studies. Differential mobility analyzers (DMAs), centrifugal particle mass analyzers (CPMAs) and aerodynamic aerosol classifiers (AACs) are commonly used to select particles with a specific mobility diameter, aerodynamic diameter or mass, respectively. However, multiple charging effects cannot be entirely avoided when using either individual techniques or tandem systems such as DMA–CPMA, especially when selecting soot particles with fractal structures. In this study, we calculate the transfer functions of the DMA–CPMA and DMA–AAC in static configurations for flame-generated soot particles. We propose an equation that constrains the resolutions of the DMA and CPMA to eliminate the multiple charging effect when selecting particles with a certain mass–mobility relationship using the DMA–CPMA system. The equation for the DMA–AAC system is also derived. For DMA–CPMA in a static configuration, our results show that the ability to remove multiply charged particles mainly depends on the particle morphology and resolution settings of the DMA and CPMA. Using measurements from soot experiments and literature data, a general trend in the appearance of the multiple charging effect with decreasing size when selecting aspherical particles is observed. As for DMA–AAC in a static configuration, the ability to eliminate particles with multiple charges is mainly related to the resolutions of the classifiers. In most cases, the DMA–AAC in a static configuration can eliminate the multiple charging effect regardless of the particle morphology, but multiply charged particles will be selected when decreasing the resolution of the DMA or AAC. We propose that the potential influence of the multiple charging effect should be considered when using the DMA–CPMA or DMA–AAC systems in estimating size- and mass-resolved optical properties in field and lab experiments.

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A comparative study on effective density, shape factor, and volatile mixing of non-spherical particles using tandem aerodynamic diameter, mobility diameter, and mass measurements

Cited by 13 publications

References 68 publications

Particle size amplification of black carbon by scattering measurement due to morphology diversity

Particle size amplification of black carbon by scattering measurement due to morphology diversity

Climate-relevant properties of black carbon aerosols revealed by in situ measurements: a review

Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

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