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| Titel |
A broadband cavity-enhanced spectrometer for measuring the extinction of aerosols at blue and near-UV wavelengths |
| VerfasserIn |
Dean Venables, Donovan Fullam, Phuoc Hoa Le, Jun Chen, Olaf Böge, Hartmut Herrmann |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131444
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| Publikation (Nr.) |
 EGU/EGU2016-11854.pdf |
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| Zusammenfassung |
| We describe a new broadband cavity-enhanced absorption spectrometer for sensitive
extinction measurements of aerosols. The instrument is distinguished by its broad and
continuous spectral coverage from the near-UV to blue wavelengths (ca. 320 to 450 nm). The
short wavelength region has been little explored compared to visible wavelengths, but is
important because (1) brown carbon (BrC) absorbs strongly in this wavelength region, and (2)
absorption of near-UV radiation in the atmosphere alters the photolysis rate of the key
atmospheric species O3, NO2, and HONO, with implications for air quality and atmospheric
oxidation capacity. The instrument performance and the effect of a switchable in-line filter
are characterised. Early results using the instrument in the TROPOS atmospheric simulation
chamber are presented. These experiments include studies of secondary organic
aerosol formation (SOA), and biomass burning experiments of rice and wheat straw,
followed by experiments simulating particle aging under daytime and nighttime
conditions. |
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