Variability in morphology, hygroscopicity, and optical properties of soot aerosols during atmospheric processing

The atmospheric effects of soot aerosols include interference with radiative transfer, visibility impairment, and alteration of cloud formation and are highly sensitive to the manner by which soot is internally mixed with other aerosol constituents. We present experimental studies to show that soot...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2008-07, Vol.105 (30), p.10291-10296
Main Authors: Zhang, Renyi, Khalizov, Alexei F, Pagels, Joakim, Zhang, Dan, Xue, Huaxin, McMurry, Peter H
Format: Article
Language:English
Subjects:
Aerosols
Agglomerates
Air Pollutants - analysis
Air Pollutants - chemistry
Air Pollution
Atmosphere
Atmospheric aerosols
Atmospheric chemistry
Atmospherics
Average linear density
Carbon - analysis
Chemistry - methods
Clouds
Condensation
Microscopy, Electron, Transmission
Models, Chemical
Optical properties
Optics and Photonics
Particle mass
Particle Size
Physical Sciences
Research Design
Soot
Sulfuric acid
Sulfuric acids
Sulfuric Acids - analysis
Time Factors
Vapors
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Summary:The atmospheric effects of soot aerosols include interference with radiative transfer, visibility impairment, and alteration of cloud formation and are highly sensitive to the manner by which soot is internally mixed with other aerosol constituents. We present experimental studies to show that soot particles acquire a large mass fraction of sulfuric acid during atmospheric aging, considerably altering their properties. Soot particles exposed to subsaturated sulfuric acid vapor exhibit a marked change in morphology, characterized by a decreased mobility-based diameter but an increased fractal dimension and effective density. These particles experience large hygroscopic size and mass growth at subsaturated conditions (
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0804860105