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| Titel |
Development of a cavity-enhanced aerosol albedometer |
| VerfasserIn |
W. Zhao, X. Xu, M. Dong, W. Chen, X. Gu, C. Hu, Y. Huang, X. Gao, W. Huang, W. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 8 ; Nr. 7, no. 8 (2014-08-18), S.2551-2566 |
| Datensatznummer |
250115873
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| Publikation (Nr.) |
 copernicus.org/amt-7-2551-2014.pdf |
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| Zusammenfassung |
| We report on the development of a cavity-enhanced aerosol single-scattering
albedometer based on incoherent broadband cavity-enhanced absorption
spectroscopy (IBBCEAS) combined with an integrating sphere (IS) for
simultaneous in situ measurements of aerosol scattering and extinction
coefficients in an exact same sample volume. The cavity-enhanced albedometer
employed a blue light-emitting-diode (LED)-based IBBCEAS approach for the
measurement of wavelength-resolved aerosol optical extinction over the
spectral range of 445–480 nm and an integrating sphere nephelometer coupled
to the IBBCEAS setup for the measurement of aerosol scattering. The
scattering signal was measured with a single-channel photomultiplier tube
(PMT), providing an averaged value over a narrow bandwidth (full-width at
half-maximum, FWHM, ~ 9 nm) in the spectral region of 465–474 nm. A
scattering coefficient at a wavelength of 470 nm was deduced as an averaged
scattering value over the spectral region of 465–474 nm and used for data
analysis and instrumental performance comparison. Performance evaluation of
the albedometer was carried out using laboratory-generated particles and
ambient aerosol. The scattering and extinction measurements of monodisperse
polystyrene latex (PSL) spheres generated in the laboratory proved excellent
correlation between two channels of the albedometer. The retrieved refractive
index (RI) of the PSL particles from the measured scattering and extinction
efficiencies agreed well with the values reported in previously published
papers. Aerosol light scattering and extinction coefficients,
single-scattering albedo (SSA) and NO2 concentrations in an ambient
sample were directly and simultaneously measured using the albedometer
developed. The instrument developed was validated via an
intercomparison of the measured aerosol scattering coefficients and NO2
trace gas concentrations to a TSI 3563 integrating nephelometer and a
chemiluminescence detector, respectively. |
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