Bias in quantification of light absorption enhancement of black carbon aerosol coated with low-volatility brown carbon

2021 ◽  
pp. 1-18
Author(s):  
Nishit Shetty ◽  
Payton Beeler ◽  
Theodore Paik ◽  
Fred J. Brechtel ◽  
Rajan K. Chakrabarty
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Absorption Enhancement ◽  
Brown Carbon ◽  
Black Carbon Aerosol

scholarly journals Light Absorption Enhancement of Black Carbon Aerosol Constrained by Particle Morphology

2018 ◽  
Vol 52 (12) ◽  
pp. 6912-6919 ◽  
Author(s):  
Yu Wu ◽  
Tianhai Cheng ◽  
Dantong Liu ◽  
James D. Allan ◽  
Lijuan Zheng ◽  
...  
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Particle Morphology ◽  
Absorption Enhancement ◽  
Black Carbon Aerosol

scholarly journals Aerosol light absorption and the role of extremely low volatility organic compounds

2020 ◽  
Vol 20 (19) ◽  
pp. 11625-11637
Author(s):  
Antonios Tasoglou ◽  
Evangelos Louvaris ◽  
Kalliopi Florou ◽  
Aikaterini Liangou ◽  
Eleni Karnezi ◽  
...  
Keyword(s):  
Black Carbon ◽  
Organic Compounds ◽  
Light Absorption ◽  
Absorption Enhancement ◽  
Scanning Mobility Particle Sizer ◽  
Brown Carbon ◽  
Aerosol Absorption ◽  
Aerosol Mass ◽  
Particle Sizer

Abstract. A month-long set of summertime measurements in a remote area in the Mediterranean is used to quantify aerosol absorption and the role of black and brown carbon. The suite of instruments included a high-resolution aerosol mass spectrometer (HR-ToF-AMS) and a scanning mobility particle sizer (SMPS), both coupled to a thermodenuder and an Aethalometer, a photoacoustic extinctiometer (PAX405), and a single particle soot photometer (SP2). The average refractory black carbon (rBC) concentration during the campaign was 0.14 µg m−3, representing 3 % of the fine aerosol mass. The measured light absorption was two or more times higher than that of fresh black carbon (BC). Mie theory indicated that the absorption enhancement due to the coating of BC cores by nonrefractory material could explain only part of this absorption enhancement. The role of brown carbon (BrC) and other non-BC light-absorbing material was then investigated. A good correlation (R2=0.76) between the unexplained absorption and the concentration of extremely low volatility organic compounds (ELVOCs) mass was found.

Mixing State of Black Carbon Aerosol in a Heavily Polluted Urban Area of China: Implications for Light Absorption Enhancement

2014 ◽  
Vol 48 (7) ◽  
pp. 689-697 ◽  
Author(s):  
Qiyuan Wang ◽  
R.-J. Huang ◽  
Junji Cao ◽  
Yongming Han ◽  
Gehui Wang ◽  
...  
Keyword(s):  
Black Carbon ◽  
Urban Area ◽  
Light Absorption ◽  
Absorption Enhancement ◽  
Mixing State ◽  
Black Carbon Aerosol

scholarly journals Aerosol light absorption and the role of extremely low volatility organic compounds

2020 ◽  
Author(s):  
Antonios Tasoglou ◽  
Evangelos Louvaris ◽  
Kalliopi Florou ◽  
Aikaterini Liangou ◽  
Eleni Karnezi ◽  
...  
Keyword(s):  
Black Carbon ◽  
Organic Compounds ◽  
Light Absorption ◽  
Absorption Enhancement ◽  
Scanning Mobility Particle Sizer ◽  
Brown Carbon ◽  
Aerosol Absorption ◽  
Aerosol Mass ◽  
Particle Sizer

Abstract. A month-long set of summertime measurements in a remote area in the Mediterranean is used to quantify aerosol absorption and the role of black and brown carbon. The suite of instruments included a high-resolution Aerosol Mass Spectrometer (HR-ToF-AMS), and a Scanning Mobility Particle Sizer (SMPS) both coupled to a thermodenuder and an aethalometer, a photoacoustic extinctiometer (PAX405), a Multi-Angle Absorption Photometer (MAAP), and a Single Particle Soot Photometer (SP2). The average refractory black carbon (rBC) concentration during the campaign was 0.14 μg m−3, representing 3 % of the fine aerosol mass. The measured light absorption was two or more times higher than that of fresh black carbon (BC). Mie theory indicated that the absorption enhancement due to the coating of BC cores by non-refractory material could explain only part of this absorption enhancement. The role of brown carbon (BrC) and other non-BC light-absorbing material was then investigated. A good correlation (R2 = 0.65) between the unexplained absorption and the concentration of extremely low volatility organic compounds (ELVOCs) mass was found.

scholarly journals Method to Quantify the Black Carbon Aerosol Light Absorption Enhancement with Entropy and Diversity Measures

2021 ◽  
Author(s):  
Gang Zhao ◽  
Tianyi Tan ◽  
Yishu Zhu ◽  
Min Hu ◽  
Chunsheng Zhao
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Binary Systems ◽  
Absorption Enhancement ◽  
Mass Ratio ◽  
Radiative Effects ◽  
State Index ◽  
Black Carbon Aerosol ◽  
Mixing States ◽  
Radiative Absorption

Abstract. Large uncertainties remain when estimating the warming effects of ambient black carbon (BC) aerosols on climate. One of the key challenges in modeling the radiative effects is predicting the BC light absorption enhancement, which is mainly determined by its mass ratio of non-BC coating thickness to BC (MR). For the same MR, recent researches find that the radiative absorption enhancements by BC are also controlled by its particle-to-particle heterogeneity. In this study, the BC mixing state index (χ) is developed to quantify the dispersion of ambient black carbon aerosol mixing states based on binary systems of BC and other non-black carbon components. We demonstrate that the BC light absorption enhancement increases with χ for the same MR, which indicates that χ can be employed as a factor to constrain the light absorption enhancement of ambient BC. Our framework can be further used in the model to study the black carbon radiative effects on climate change.

scholarly journals Method to quantify black carbon aerosol light absorption enhancement with a mixing state index

2021 ◽  
Vol 21 (23) ◽  
pp. 18055-18063
Author(s):  
Gang Zhao ◽  
Tianyi Tan ◽  
Yishu Zhu ◽  
Min Hu ◽  
Chunsheng Zhao
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Binary Systems ◽  
Absorption Enhancement ◽  
Mixing State ◽  
Radiative Effects ◽  
State Index ◽  
Black Carbon Aerosol ◽  
Mixing States ◽  
Radiative Absorption

Abstract. Large uncertainties remain when estimating the warming effects of ambient black carbon (BC) aerosols on climate. One of the key challenges in modeling the radiative effects is predicting the BC light absorption enhancement, which is mainly determined by the mass ratio (MR) of non-BC coating material to BC in the population of BC-containing aerosols. For the same MR, recent research has found that the radiative absorption enhancements by BC are also controlled by its particle-to-particle heterogeneity. In this study, the BC mixing state index (χ) is developed to quantify the dispersion of ambient black carbon aerosol mixing states based on binary systems of BC and other non-black carbon components. We demonstrate that the BC light absorption enhancement increases with χ for the same MR, which indicates that χ can be employed as a factor to constrain the light absorption enhancement of ambient BC. Our framework can be further used in the model to study the radiative effects of black carbon on climate change.

scholarly journals Production of particulate brown carbon during atmospheric aging of residential wood-burning emissions

2018 ◽  
Vol 18 (24) ◽  
pp. 17843-17861 ◽  
Author(s):  
Nivedita K. Kumar ◽  
Joel C. Corbin ◽  
Emily A. Bruns ◽  
Dario Massabó ◽  
Jay G. Slowik ◽  
...  
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Wavelength Dependence ◽  
Organic Aerosol ◽  
Geometric Standard Deviation ◽  
Wood Combustion ◽  
Brown Carbon ◽  
Atmospheric Aging ◽  
Aerosol Absorption ◽  
Uv Visible

Abstract. We investigate the optical properties of light-absorbing organic carbon (brown carbon) from domestic wood combustion as a function of simulated atmospheric aging. At shorter wavelengths (370–470 nm), light absorption by brown carbon from primary organic aerosol (POA) and secondary organic aerosol (SOA) formed during aging was around 10 % and 20 %, respectively, of the total aerosol absorption (brown carbon plus black carbon). The mass absorption cross section (MAC) determined for black carbon (BC, 13.7 m2 g−1 at 370 nm, with geometric standard deviation GSD =1.1) was consistent with that recommended by Bond et al. (2006). The corresponding MAC of POA (5.5 m2 g−1; GSD =1.2) was higher than that of SOA (2.4 m2 g−1; GSD =1.3) at 370 nm. However, SOA presents a substantial mass fraction, with a measured average SOA ∕ POA mass ratio after aging of ∼5 and therefore contributes significantly to the overall light absorption, highlighting the importance of wood-combustion SOA as a source of atmospheric brown carbon. The wavelength dependence of POA and SOA light absorption between 370 and 660 nm is well described with absorption Ångström exponents of 4.6 and 5.6, respectively. UV-visible absorbance measurements of water and methanol-extracted OA were also performed, showing that the majority of the light-absorbing OA is water insoluble even after aging.

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