Effect of heterogeneous oxidative aging on light absorption by biomass burning organic aerosol

Browne, E. C.; Zhang, Xiaolu; Franklin, J. P.; Ridley, Kelsey J.; Kirchstetter, Thomas W.; Wilson, Kevin R.; Cappa, C. D.; Kroll, J. H.

doi:10.1080/02786826.2019.1599321

Cited by 77 publications

(106 citation statements)

References 54 publications

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“…Ye et al, 2019), and aqueous-phase reactions (Lin et al, 2015;Tang et al, 2016;Xu et al, 2018a). On the other hand, AAE decrease could also occur during atmospheric aging (Romonosky et al, 2019), either induced by photobleaching of BrC (Adler et al, 2011;Jang, 2011, 2014;Lee et al, 2014;Canonaco et al, 2015;Lin et al, 2016;Sumlin et al, 2017;Bhattarai et al, 2018;Fortenberry et al, 2018;Hems and Abbatt, 2018;Browne et al, 2019;Dasari et al, 2019;Wong et al, 2019;Cai et al, 2019;Liakakou et al, 2019;Ray et al, 2019) or aqueous-phase BrC degradation in the absence of light (Santos and Duarte, 2015;G. T. A.…”

Section: Comparison Of E Abs With Previous Studiesmentioning

confidence: 99%

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Amplification of black carbon light absorption induced by atmospheric aging: temporal variation at seasonal and diel scales in urban Guangzhou

Sun

et al. 2020

Atmos. Chem. Phys.

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Abstract. Black carbon (BC) aerosols have been widely recognized as a vital climate forcer in the atmosphere. Amplification of light absorption can occur due to coatings on BC during atmospheric aging, an effect that remains uncertain in accessing the radiative forcing of BC. Existing studies on the absorption enhancement factor (Eabs) have poor coverage on both seasonal and diurnal scales. In this study, we applied a recently developed minimum R squared (MRS) method, which can cover both seasonal and diurnal scales, for Eabs quantification. Using field measurement data in Guangzhou, the aims of this study are to explore (1) the temporal dynamics of BC optical properties at seasonal (wet season, 31 July–10 September; dry season, 15 November 2017–15 January 2018) and diel scales (1 h time resolution) in the typical urban environment and (2) the influencing factors on Eabs temporal variability. Mass absorption efficiency at 520 nm by primary aerosols (MAEp520) determined by the MRS method exhibited a strong seasonality (8.6 m2 g−1 in the wet season and 16.8 m2 g−1 in the dry season). Eabs520 was higher in the wet season (1.51±0.50) and lower in the dry season (1.29±0.28). Absorption Ångström exponent (AAE470–660) in the dry season (1.46±0.12) was higher than that in the wet season (1.37±0.10). Collective evidence showed that the active biomass burning (BB) in the dry season effectively altered the optical properties of BC, leading to elevated MAE, MAEp and AAE in the dry season compared to those in the wet season. Diurnal Eabs520 was positively correlated with AAE470–660 (R2=0.71) and negatively correlated with the AE33 aerosol loading compensation parameter (k) (R2=0.74) in the wet season, but these correlations were significantly weaker in the dry season, which may be related to the impact of BB. This result suggests that during the wet season, the lensing effect was more likely dominating the AAE diurnal variability rather than the contribution from brown carbon (BrC). Secondary processing can affect Eabs diurnal dynamics. The Eabs520 exhibited a clear dependency on the ratio of secondary organic carbon to organic carbon (SOC∕OC), confirming the contribution of secondary organic aerosols to Eabs; Eabs520 correlated well with nitrate and showed a clear dependence on temperature. This new finding implies that gas–particle partitioning of semivolatile compounds may potentially play an important role in steering the diurnal fluctuation of Eabs520. In the dry season, the diurnal variability in Eabs520 was associated with photochemical aging as evidenced by the good correlation (R2=0.69) between oxidant concentrations (Ox=O3+NO2) and Eabs520.

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Section: Comparison Of E Abs With Previous Studiesmentioning

confidence: 99%

“…(2). Particle loss in the TD is unavoidable and needs to be accounted for (Burtscher et al, 2001). The advantage of the TD is its ability to obtain high-time-resolution data (Cappa et al, 2012;Lack et al, 2012b;Liu et al, 2015;.…”

Section: Introductionmentioning

confidence: 99%

Amplification of black carbon light absorption induced by atmospheric aging: temporal variation at seasonal and diel scales in urban Guangzhou

Sun

et al. 2020

Atmos. Chem. Phys.

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“…Their reactions with atmospheric oxidizers, such as the OH radical, lead to chemical aging and potentially to the release of new volatile components to the atmosphere. In addition, the optical properties of these aerosols will greatly depend on the chemical composition and physical structure of the particle surface [11,14].…”

Section: Relevance For Atmospheric Chemistrymentioning

confidence: 99%

“…Although there are large uncertainties concerning their composition and phase state, they are believed to be mainly biogenic secondary particles formed from forest fires, biomass burning, and biofuel combustion [3][4][5][6][7][8]. Chemical and physical changes due to the multiphase processes between the atmosphere and the particles have impacts on climate, air quality, visibility, and human health [2,[9][10][11][12][13][14]. Due to the particle high viscosity (ranging from 10 2 to 10 12 Pa s), such changes are limited by slow bulk diffusion over a long time-scale [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bulk Composition on the Heterogeneous Oxidation of Semi-Solid Atmospheric Aerosols

Fan

Goulay

2019

Atmosphere

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The OH-initiated heterogeneous oxidation of semi-solid saccharide particles with varying bulk compositions was investigated in an atmospheric pressure flow tube at 30% relative humidity. Reactive uptake coefficients were determined from the rate loss of the saccharide reactants measured by mass spectrometry at different monosaccharide (methyl-β-d-glucopyranoside, C7H14O6) and disaccharide (lactose, C12H22O11) molar ratios. The reactive uptake for the monosaccharide was found to decrease from 0.53 ± 0.10 to 0.05 ± 0.06 as the mono-to-disaccharide molar ratio changed from 8:1 to 1:1. A reaction–diffusion model was developed in order to determine the effect of chemical composition on the reactive uptake. The observed decays can be reproduced using a Vignes relationship to predict the composition dependence of the reactant diffusion coefficients. The experimental data and model results suggest that the addition of the disaccharide significantly increases the particle viscosity leading to slower mass transport phenomena from the bulk to the particle surface and to a decreased reactivity. These findings illustrate the impact of bulk composition on reactant bulk diffusivity which determines the rate-limiting step during the chemical transformation of semi-solid particles in the atmosphere.

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“…Zhang et al (2017) showed BrC relative to BC enhancements for smoke plumes undergoing convection and suggested that in-cloud heterogeneous processing may produce BrC. Browne et al (2019) also suggested that a fraction of BrC produced from heterogeneous oxidation by ozone is free from the bleaching effect and BrC produced from heterogeneous oxidation of OH has a longer lifetime. In addition, hydrophobic OC, such as humic-like substances (HULIS), is more likely to have high light-absorption compared to hydrophilic OC (Hoffer et al, 2006).…”

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confidence: 99%

Reply to 'A couple of general comments' from Jonathan Taylor

Zhang¹

2019

Preprint

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Effect of heterogeneous oxidative aging on light absorption by biomass burning organic aerosol

Cited by 77 publications

References 54 publications

Amplification of black carbon light absorption induced by atmospheric aging: temporal variation at seasonal and diel scales in urban Guangzhou

Amplification of black carbon light absorption induced by atmospheric aging: temporal variation at seasonal and diel scales in urban Guangzhou

Effect of Bulk Composition on the Heterogeneous Oxidation of Semi-Solid Atmospheric Aerosols

Reply to 'A couple of general comments' from Jonathan Taylor

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