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| Titel |
Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation |
| VerfasserIn |
X. Wang, T. Liu, F. Bernard, X. Ding, S. Wen, Y. Zhang, Z. Zhang, Q. He, S. Lu, J. Chen, S. Saunders, J. Yu |
| 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. 1 ; Nr. 7, no. 1 (2014-01-29), S.301-313 |
| Datensatznummer |
250115573
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| Publikation (Nr.) |
 copernicus.org/amt-7-301-2014.pdf |
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| Zusammenfassung |
| We describe here characterization of a new state-of-the-art smog chamber
facility for studying atmospheric gas-phase and aerosol chemistry. The
chamber consists of a 30 m3 fluorinated ethylene propylene (FEP) Teflon
film reactor housed in a temperature-controlled enclosure equipped with black
lamps as the light source. Temperature can be set in the range from
−10 to 40 °C at accuracy of ±1 °C as
measured by eight temperature sensors inside the enclosure and one just
inside the reactor. Matrix air can be purified with non-methane hydrocarbons
(NMHCs) < 0.5 ppb, NOx/O3/carbonyls < 1 ppb
and particles < 1 cm−3. The photolysis rate of NO2 is
adjustable between 0 and 0.49 min−1. At 298 K under dry conditions, the
average wall loss rates of NO, NO2 and O3 were measured to be 1.41
× 10−4 min−1, 1.39 × 10−4 min−1 and 1.31
× 10−4 min−1, respectively, and the particle number wall loss
rate was measured to be 0.17 h−1. Auxiliary mechanisms of this chamber are
determined and included in the Master Chemical Mechanism to evaluate and
model propene–NOx–air irradiation experiments. The results
indicate that this new smog chamber can provide high-quality data for
mechanism evaluation. Results of α-pinene dark ozonolysis experiments
revealed secondary organic aerosol (SOA) yields comparable to those from other chamber studies, and the
two-product model gives a good fit for the yield data obtained in this work.
Characterization experiments demonstrate that our Guangzhou Institute of Geochemistry, Chinese Academy Sciences (GIG-CAS), smog chamber
facility can be used to provide valuable data for gas-phase chemistry and
secondary aerosol formation. |
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