scholarly journals Formation and photochemical properties of aqueous brown carbon through glyoxal reactions with glycine

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38566-38573 ◽  
Author(s):  
Yan Gao ◽  
Yunhong Zhang
Keyword(s):  
Light Absorption ◽  
Climate Forcing ◽  
Brown Carbon ◽  
Atmospheric Research ◽  
Photochemical Properties ◽  
Carbon Aerosols

In recent years, brown carbon aerosols, as important contributors to light absorption and climate forcing by aerosols, have been forefront in the field of atmospheric research.

Evolution of the light-absorption properties of combustion brown carbon aerosols following reaction with nitrate radicals

2020 ◽  
Vol 54 (7) ◽  
pp. 849-863 ◽  
Author(s):  
Zezhen Cheng ◽  
Khairallah M. Atwi ◽  
Zhenhong Yu ◽  
Anita Avery ◽  
Edward C. Fortner ◽  
...  
Keyword(s):  
Light Absorption ◽  
Absorption Properties ◽  
Brown Carbon ◽  
Nitrate Radicals ◽  
Carbon Aerosols

scholarly journals Modeling of Carbonyl/Ammonium Sulfate Aqueous Brown Carbon Chemistry via UV/Vis Spectral Decomposition

Atmosphere ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 358 ◽  
Author(s):  
Mengjie Fan ◽  
Shiqing Ma ◽  
Nahin Ferdousi ◽  
Ziwei Dai ◽  
Joseph L. Woo
Keyword(s):  
Climate Forcing ◽  
Reaction Products ◽  
Brown Carbon ◽  
Reaction Systems ◽  
Reaction Rate Constants ◽  
Kinetic Information ◽  
First Order Kinetics ◽  
Aggregate Effect ◽  
Light Absorbance

The proper characterization of aqueous brown carbon (BrC) species, their formation, and their light absorbance properties is critical to understanding the aggregate effect that they have on overall atmospheric aerosol climate forcing. The contribution of dark chemistry secondary organic aerosol (SOA) products from carbonyl-containing organic compounds (CVOCs) to overall aqueous aerosol optical properties is expected to be significant. However, the multiple, parallel pathways that take place within CVOC reaction systems and the differing chromophoricity of individual products complicates the ability to reliably model the chemical kinetics taking place. Here, we proposed an alternative method of representing UV-visible absorbance spectra as a composite of Gaussian lineshape functions to infer kinetic information. Multiple numbers of curves and different CVOC/ammonium reaction systems were compared. A model using three fitted Gaussian curves with magnitudes following first-order kinetics achieved an accuracy within 65.5% in the 205–300-nm range across multiple organic types and solution aging times. Asymmetrical peaks that occurred in low-200-nm wavelengths were decomposed into two overlapping Gaussian curves, which may have been attributable to different functional groups or families of reaction products. Component curves within overall spectra exhibited different dynamics, implying that the utilization of absorbance at a single reference wavelength to infer reaction rate constants may result in misrepresentative kinetics for these systems.

Composition and sources of brown carbon aerosols in Megacity Beijing during the winter of 2016

2021 ◽  
pp. 105773
Author(s):  
Xingru Li ◽  
Qing Zhao ◽  
Yang Yang ◽  
Zhengyu Zhao ◽  
Zirui Liu ◽  
...  
Keyword(s):  
Brown Carbon ◽  
Carbon Aerosols

scholarly journals A dominant contribution to light absorption by methanol-insoluble brown carbon produced in the combustion of biomass fuels typically consumed in wildland fires in the United States

2022 ◽  
Author(s):  
Khairallah Atwi ◽  
Charles Perrie ◽  
Zezhen Cheng ◽  
Omar El Hajj ◽  
Rawad Saleh
Keyword(s):  
United States ◽  
Solvent Extraction ◽  
Light Absorption ◽  
The United States ◽  
Extraction Methods ◽  
Wildland Fires ◽  
Dominant Contribution ◽  
Biomass Fuels ◽  
Absorption Properties ◽  
Brown Carbon

The light-absorption properties of brown carbon (BrC) are often estimated using offline, solvent-extraction methods. However, recent studies have found evidence of insoluble species of BrC which are unaccounted for in...

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