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| Titel |
Experimentally measured morphology of biomass burning aerosol and its impacts on CCN ability |
| VerfasserIn |
M. Giordano, C. Espinoza, A. Asa-Awuku |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-20), S.1807-1821 |
| Datensatznummer |
250119446
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| Publikation (Nr.) |
 copernicus.org/acp-15-1807-2015.pdf |
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| Zusammenfassung |
| This study examines the morphological properties of freshly emitted and
atmospherically aged aerosols from biomass burning. The impacts of particle
morphology assumptions on hygroscopic predictions are examined. Chamber
experiments were conducted at the University
of California, Riverside, Center for Environmental
Research and Technology (CE-CERT) atmospheric processes lab using two
biomass fuel sources: manzanita and chamise. Morphological data was obtained
through the use of an aerosol particle mass analyzer (APM), scanning
mobility particle sizer (SMPS) system and transmission electron microscope
(TEM). Data from these instruments was used to calculate both a dynamic
shape factor and a fractal-like dimension for the biomass burning emissions.
This data was then used with κ-Köhler theory to
adjust the calculated hygroscopicity for experimentally determined
morphological characteristics of the aerosol. Laboratory measurement of
biomass burning aerosol from two chaparral fuels show that particles are
nonspherical with dynamic shape factors greater than 1.15 for aerosol sizes
relevant to cloud condensation nuclei (CCN) activation. Accounting for
particle morphology can shift the hygroscopicity parameter by 0.15 or more.
To our knowledge, this work provides the first laboratory chamber
measurements of morphological characteristics for biomass burning cloud
condensation nuclei and provides experimental particle shape evidence to
support the variation in reported hygroscopicities of the complex aerosol. |
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