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| Titel |
Intercomparison of a Cavity Attenuated Phase Shift-based extinction monitor (CAPS PMex) with an integrating nephelometer and a filter-based absorption monitor |
| VerfasserIn |
A. Petzold, T. Onasch, P. Kebabian, A. Freedman |
| 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 ; 6, no. 5 ; Nr. 6, no. 5 (2013-05-03), S.1141-1151 |
| Datensatznummer |
250017884
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| Publikation (Nr.) |
 copernicus.org/amt-6-1141-2013.pdf |
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| Zusammenfassung |
| An evaluation of the Cavity Attenuated Phase Shift particle light extinction
monitor (CAPS PMex) using a combination of a 3-wavelength Integrating
Nephelometer (NEPH) and a 3-wavelength filter-based Particle Soot Absorption
Photometer (PSAP) was carried out using both laboratory-generated test
particles and ambient aerosols. An accurate determination of a fixed
pathlength correction for the CAPS PMex was made by comparing
extinction measurements using monodisperse PSL spheres in combination with
Mie scattering calculations to account for the presence of PSL
conglomerates. These studies yielded a linear instrument response over the
investigated dynamical range from 20 to 450 Mm−1 (10−6 m−1)
with a linear correlation coefficient of R2 > 0.98. The
adjustment factor was determined to be 1.05 times that previously reported.
Correlating CAPS extinction to extinction measured by the NEPH + PSAP
combination using laboratory-generated polydisperse mixtures of purely
scattering ammonium sulfate and highly absorbing black carbon provided a
linear regression line with slope m = 1.00 (R2 = 0.994) for
single-scattering albedo values (λ = 630 nm) ranging from 0.35
(black carbon) to 1.00 (ammonium sulfate). For ambient aerosol, light
extinction measured by CAPS was highly correlated (R2 = 0.995) to
extinction measured by the NEPH + PSAP combination with slope m = 0.95. |
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