Size-resolved chemical composition, effective density, and optical properties of biomass burning particles
Biomass burning aerosol has an important impact on the global radiative budget. A better understanding of the correlations between the mixing states of biomass burning particles and their optical properties is the goal of a number of current studies. In this work, the effective density, chemical...
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doaj-9248df69c2a4408c881acd4cb19c8e472020-11-24T22:54:32ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242017-06-01177481749310.5194/acp-17-7481-2017Size-resolved chemical composition, effective density, and optical properties of biomass burning particlesJ. Zhai0X. Lu1L. Li2Q. Zhang3Q. Zhang4C. Zhang5H. Chen6X. Yang7J. Chen8Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaDepartment of Environmental Toxicology, University of California, Davis, California 95616, USAShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaBiomass burning aerosol has an important impact on the global radiative budget. A better understanding of the correlations between the mixing states of biomass burning particles and their optical properties is the goal of a number of current studies. In this work, the effective density, chemical composition, and optical properties of rice straw burning particles in the size range of 50–400 nm were measured using a suite of online methods. We found that the major components of particles produced by burning rice straw included black carbon (BC), organic carbon (OC), and potassium salts, but the mixing states of particles were strongly size dependent. Particles of 50 nm had the smallest effective density (1.16 g cm<sup>−3</sup>) due to a relatively large proportion of aggregate BC. The average effective densities of 100–400 nm particles ranged from 1.35 to 1.51 g cm<sup>−3</sup> with OC and inorganic salts as dominant components. Both density distribution and single-particle mass spectrometry showed more complex mixing states in larger particles. Upon heating, the separation of the effective density distribution modes confirmed the external mixing state of less-volatile BC or soot and potassium salts. The size-resolved optical properties of biomass burning particles were investigated at two wavelengths (<i>λ</i> = 450 and 530 nm). The single-scattering albedo (SSA) showed the lowest value for 50 nm particles (0.741 ± 0.007 and 0.889 ± 0.006) because of the larger proportion of BC content. Brown carbon played an important role for the SSA of 100–400 nm particles. The Ångström absorption exponent (AAE) values for all particles were above 1.6, indicating the significant presence of brown carbon in all sizes. Concurrent measurements in our work provide a basis for discussing the physicochemical properties of biomass burning aerosol and its effects on the global climate and atmospheric environment.http://www.atmos-chem-phys.net/17/7481/2017/acp-17-7481-2017.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. Zhai X. Lu L. Li Q. Zhang Q. Zhang C. Zhang H. Chen X. Yang J. Chen |
spellingShingle |
J. Zhai X. Lu L. Li Q. Zhang Q. Zhang C. Zhang H. Chen X. Yang J. Chen Size-resolved chemical composition, effective density, and optical properties of biomass burning particles Atmospheric Chemistry and Physics |
author_facet |
J. Zhai X. Lu L. Li Q. Zhang Q. Zhang C. Zhang H. Chen X. Yang J. Chen |
author_sort |
J. Zhai |
title |
Size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
title_short |
Size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
title_full |
Size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
title_fullStr |
Size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
title_full_unstemmed |
Size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
title_sort |
size-resolved chemical composition, effective density, and optical properties of biomass burning particles |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2017-06-01 |
description |
Biomass burning aerosol has an important impact on the global radiative
budget. A better understanding of the correlations between the mixing states
of biomass burning particles and their optical properties is the goal of a
number of current studies. In this work, the effective density, chemical
composition, and optical properties of rice straw burning particles in the
size range of 50–400 nm were measured using a suite of online methods. We
found that the major components of particles produced by burning rice straw
included black carbon (BC), organic carbon (OC), and potassium salts, but the
mixing states of particles were strongly size dependent. Particles of 50 nm
had the smallest effective density (1.16 g cm<sup>−3</sup>) due to a relatively
large proportion of aggregate BC. The average effective densities of
100–400 nm particles ranged from 1.35 to 1.51 g cm<sup>−3</sup> with OC and
inorganic salts as dominant components. Both density distribution and
single-particle mass spectrometry showed more complex mixing states in larger
particles. Upon heating, the separation of the effective density distribution
modes confirmed the external mixing state of less-volatile BC or soot and
potassium salts. The size-resolved optical properties of biomass burning
particles were investigated at two wavelengths (<i>λ</i> = 450 and
530 nm). The single-scattering albedo (SSA) showed the lowest value for
50 nm particles (0.741 ± 0.007 and 0.889 ± 0.006) because of the
larger proportion of BC content. Brown carbon played an important role for
the SSA of 100–400 nm particles. The Ångström absorption exponent
(AAE) values for all particles were above 1.6, indicating the significant
presence of brown carbon in all sizes. Concurrent measurements in our work
provide a basis for discussing the physicochemical properties of biomass
burning aerosol and its effects on the global climate and atmospheric
environment. |
url |
http://www.atmos-chem-phys.net/17/7481/2017/acp-17-7481-2017.pdf |
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