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| Titel |
Multi-wavelength optical measurement to enhance thermal/optical analysis for carbonaceous aerosol |
| VerfasserIn |
L.-W. A. Chen, J. C. Chow, X. L. Wang, J. A. Robles, B. J. Sumlin, D. H. Lowenthal, R. Zimmermann, J. G. Watson |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-27), S.451-461 |
| Datensatznummer |
250116066
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| Publikation (Nr.) |
 copernicus.org/amt-8-451-2015.pdf |
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| Zusammenfassung |
| A thermal/optical carbon analyzer equipped with seven-wavelength light
source/detector (405–980 nm) for monitoring spectral reflectance (R) and
transmittance (T) of filter samples allowed "thermal spectral analysis
(TSA)" and wavelength (λ)-dependent organic-carbon (OC)–elemental-carbon (EC) measurements. Optical sensing was calibrated with transfer
standards traceable to absolute R and T measurements, adjusted for
loading effects to report spectral light absorption (as absorption
optical depth (τa, λ)), and verified using diesel exhaust samples. Tests on ambient and source samples show OC and EC concentrations
equivalent to those from conventional carbon analysis when based on the same
wavelength (~ 635 nm) for pyrolysis adjustment. TSA provides
additional information that evaluates black-carbon (BC) and brown-carbon
(BrC) contributions and their optical properties in the near infrared to the
near ultraviolet parts of the solar spectrum. The enhanced carbon analyzer can add
value to current aerosol monitoring programs and provide insight into more
accurate OC and EC measurements for climate, visibility, or health studies. |
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