Spectral absorption of biomass burning aerosol determined from retrieved single scattering albedo during ARCTAS

Corr, Chelsea A.; Hall, Samuel R.; Ullmann, Kirk; Anderson, B. E.; Beyersdorf, A. J.; Thornhill, K. L.; Cubison, M. J.; Jimenez, José L.; Wisthaler, Armin; Dibb, Jack E.

doi:10.5194/acp-12-10505-2012

Cited by 44 publications

(47 citation statements)

References 70 publications

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“…More complex multi-wavelength methods for absorption attribution have been reported and mostly use satellite, aircraft, or ground-based measurements of multi-spectral aerosol optical depth, actinic flux, scattering, or back scattering and extinction Arola et al, 2011;Kaufman et al, 2002;Schuster et al, 2005;Bergstrom et al, 2004;Corr et al, 2012). These methods use radiation models and complex Mie modelling retrievals to determine particle type (fine vs. coarse mode), and multi-spectral particle refractive index, SSA and absorption.…”

Section: Methodsmentioning

confidence: 99%

“…Updyke et al, 2012). Values of AAE for BrC up to 9.5 have been observed (wavelength pairs: 400, 700 nm) (Andreae and Gelencser, 2006, and references therein; Rizzo et al, 2011;Flowers et al, 2010;Lewis et al, 2008;Corr et al, 2012) while AAEs for desert dust range from 2.5 to 6.0 (wavelength pairs: 467 nm, 660 nm) (e.g. Weinzierl et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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On the attribution of black and brown carbon light absorption using the Ångström exponent

2013

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Abstract. The absorption Ångström exponent (AAE) of externally mixed black carbon (BC Ext ), or BC internally mixed with non-absorbing material (BC Int ), is often used to determine the contribution of brown carbon (BrC) light absorption at short visible wavelengths. This attribution method contains assumptions with uncertainties that have not been formally assessed. We show that the potential range of AAE for BC Ext (or BC Int ) in the atmosphere can reasonably lead to +7 % to −22 % uncertainty in BC Ext (or BC Int ) absorption at short wavelengths derived from measurements made at longer wavelengths, where BrC is assumed not to absorb light. These uncertainties propagate to errors in the attributed absorption of BrC. For uncertainty in attributed BrC absorption to be ≤ ± 33 %, 23 % to 41 % of total absorption must be sourced from BrC. These uncertainties would be larger if absorption by dust were also to be considered due to additional AAE assumptions. For data collected during a biomass-burning event, the mean difference between measured and AAE attributed BrC absorption was found to be 34 % -an additional uncertainty in addition to the theoretical uncertainties presented. In light of the potential for introducing significant and poorly constrained errors, we caution against the universal application of the AAE method for attributing BrC absorption.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the attribution of black and brown carbon light absorption using the Ångström exponent

2013

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“…Our data cannot differentiate between inorganic and organic nitrates, however these compounds remain a possibility as the contributors to BrC absorption. Other studies show BrC absorption efficiency increasing as it is oxidized (Corr et al, 2012;Marley et al, 2009;Adler et al, 2011;Bones et al, 2010), presumably from processing of emitted POM or secondary POM formed from VOC emissions, to produce low-visible and UV-active chromophores. Our data does not provide an opportunity to (Lack et al, 2012b).…”

Section: Mass Absorption Efficiency (Mae) Of Brown Carbonmentioning

confidence: 99%

“…AbsorptionÅngstrom exponent is often interrogated for indications of BB influenced particles, where it is assumed that anÅ Abs > 1 is indicative of absorption by more than just BC, such as dust and BrC (Gyawali et al, 2009;Lewis et al, 2008;Corr et al, 2012;Yang et al, 2009;Favez et al, 2009). There is a correlation between wavelength dependency of absorption for this heavily BB influenced plume (Å Abs ) and f 60 /f 44 (Fig.…”

Section: Absorptionångstrom Exponent (å Abs )mentioning

confidence: 99%

Brown carbon absorption linked to organic mass tracers in biomass burning particles

et al. 2013

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Traditional gas and particle phase chemical markers used to identify the presence of biomass burning (BB) emissions were measured for a large forest fire near Boulder, Colorado. Correlation of the organic matter mass spectroscopic m/z 60 with measured particle light absorption properties found no link at 532 nm, and a strong correlation at 404 nm. Non-black carbon absorption at 404 nm was well correlated to the ratio of the mass fractions of particulate organic matter (POM) that was m/z 60 (f₆₀) to m/z 44 (f₄₄). The f₆₀ to f₄₄ ratio did not fully explain the variability in non-BC absorption, due to contributions of brown carbon (BrC) absorption and absorption due to internal mixing of POM with black carbon (BC). The absorption Ångstrom exponent (Å_Abs) showed a good correlation to f₆₀/f₄₄; however the best correlation resulted from the mass absorption efficiency (MAE) of BrC at 404 nm (MAE_{POM-404 nm}) and f₆₀/f₄₄. This result indicates that the absorption of POM at low visible and UV wavelengths is linked to emissions of organic matter that contribute to the m/z 60 mass fragment, although they do not contribute to 532 nm absorption. m/z 60 is often attributed to levoglucosan and related compounds. The linear relationship between MAE_{POM-404 nm} and f₆₀/f₄₄ suggests that the strength of BrC absorption for this fire can be predicted by emissions of f₆₀-related organic matter

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“…Generally, the AAE of externally mixed EC is 1.0 for EC-contained particle with < 50 nm diameter (Moosmuller et al 2010), while the AAE of internally mixed EC by the presence of transparent coatings (non-absorbing coating) can reach to 1.7 (Gyawali et al 2009;Lack and Cappa 2010). Moreover, the AAE of internally mixed EC by the presence of non-EC absorbers (e.g., brown carbon, which is mainly emitted from biomass burning) coatings can increase even higher (Corr et al 2012). The AAE can be calculated from the b ap at the wavelength of 880 and 370 nm in this study (Lack and Langridge 2013).…”

Section: Mae Of Ec In Pm 25mentioning

confidence: 99%

Characteristics of Mass Absorption Efficiency of Elemental Carbon in Urban Chengdu, Southwest China: Implication for the Coating Effects on Aerosol Absorption

Tao

Zhang

et al. 2018

Aerosol Sci Eng

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To investigate the mass absorption efficiency (MAE) of elemental carbon (EC) at Chengdu in China's Sichuan Basin, daily PM 2.5 filter samples were collected during the typical month for each season in 2011. PM 2.5 samples were subject to chemical analysis for water-soluble inorganic ions, organic carbon and EC, as well as biomass burning organic tracer (i.e., levoglucosan). Additionally, PM 2.5 samples were further conducted for aerosol absorption coefficient (b ap ) measurement at the wavelengths of 370 and 880 nm. To evaluate the seasonal variations of MAEs of EC, linear regression analyses were applied to EC (determined by thermal method), black carbon (BC, determined by optical method) and b ap for four seasons. The average BC concentration was 10 µg m −3 when using the manufacturer's recommended value (16.6 m 2 g −1 at the wavelength of 880 nm), which was 1.4 times the mean EC concentration. The MAE of EC at 880 nm was estimated to be 6.1 m 2 g −1 in autumn, which was evidently lower than 6.7-6.9 m 2 g −1 in other seasons. The higher MAE in other seasons was likely due to more effective light absorption by internally mixed EC with both transparent coatings (e.g., sulfate and nitrate) and organic matters coatings.

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Spectral absorption of biomass burning aerosol determined from retrieved single scattering albedo during ARCTAS

Cited by 44 publications

References 70 publications

On the attribution of black and brown carbon light absorption using the Ångström exponent

On the attribution of black and brown carbon light absorption using the Ångström exponent

Brown carbon absorption linked to organic mass tracers in biomass burning particles

Characteristics of Mass Absorption Efficiency of Elemental Carbon in Urban Chengdu, Southwest China: Implication for the Coating Effects on Aerosol Absorption

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