Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Atmospheric Measurement Techniques Année : 2014

Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation

Résumé

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 m 3 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, NO x /O 3 /carbonyls < 1 ppb and particles < 1 cm −3. The pho-tolysis rate of NO 2 is adjustable between 0 and 0.49 min −1. At 298 K under dry conditions, the average wall loss rates of NO, NO 2 and O 3 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-NO x-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.
Fichier principal
Vignette du fichier
2014_Wang_AMT.pdf (450.05 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02904589 , version 1 (28-07-2020)

Identifiants

Citer

X. Wang, T. Liu, François Bernard, X. Ding, S. Wen, et al.. Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation. Atmospheric Measurement Techniques, 2014, 7 (1), pp.301-313. ⟨10.5194/amt-7-301-2014⟩. ⟨hal-02904589⟩
39 Consultations
226 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More