Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions

被引：301

作者：

Saleh, R. ^{[1
]}

Hennigan, C. J. ^{[2
]}

McMeeking, G. R. ^{[3
]}

Chuang, W. K. ^{[1
]}

Robinson, E. S. ^{[1
]}

Coe, H. ^{[4
]}

Donahue, N. M. ^{[1
]}

Robinson, A. L. ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Ctr Atmospher Particle Studies, Pittsburgh, PA 15213 USA

[2] Univ Maryland Baltimore Cty, Baltimore, MD 21228 USA

[3] Droplet Measurement Technol, Boulder, CO USA

[4] Univ Manchester, Ctr Atmospher Sci, Manchester, Lancs, England

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2013年 / 13卷 / 15期

关键词：

AEROSOL LIGHT-ABSORPTION; SECONDARY ORGANIC AEROSOL; BLACK CARBON; OPTICAL-PROPERTIES; WAVELENGTH DEPENDENCE; SPECTRAL DEPENDENCE; PARTICLES; SPECTROMETER; COEFFICIENT; PHOTOOXIDATION;

D O I：

10.5194/acp-13-7683-2013

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Experiments were conducted to investigate light absorption of organic aerosol (OA) in fresh and photochemically aged biomass-burning emissions. The experiments considered residential hardwood fuel (oak) and fuels commonly consumed in wild-land and prescribed fires in the United States (pocosin pine and gallberry). Photochemical aging was performed in an environmental chamber. We constrained the effective light-absorption properties of the OA using conservative limiting assumptions, and found that both primary organic aerosol (POA) in the fresh emissions and secondary organic aerosol (SOA) produced by photo-chemical aging contain brown carbon, and absorb light to a significant extent. This work presents the first direct evidence that SOA produced in aged biomass-burning emissions is absorptive. For the investigated fuels, SOA is less absorptive than POA in the long visible, but exhibits stronger wavelength-dependence and is more absorptive in the short visible and near-UV. Light absorption by SOA in biomass-burning emissions might be an important contributor to the global radiative forcing budget.

引用

页码：7683 / 7693

页数：11

共 57 条

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