TY - JOUR ID - 10.1016/j.jes.2020.09.015 TI - A large-scale outdoor atmospheric simulation smog chamber for studying atmospheric photochemical processes: Characterization and preliminary application AU - Junling Li AU - Hong Li AU - Xuezhong Wang AU - Weigang Wang AU - Maofa Ge AU - Hao Zhang AU - Xin Zhang AU - Kun Li AU - Yan Chen AU - Zhenhai Wu AU - Fahe Chai AU - Fan Meng AU - Yujing Mu AU - Abdelwahid Mellouki AU - Fang Bi AU - Yujie Zhang AU - Lingyan Wu AU - Yongchun Liu VL - 33 IS - 4 PB - SP - 185 EP - 197 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=S1001074220303879&flag=1 KW - Corresponding author.;Outdoor smog chamber;Characterization experiments;Photo-oxidation reactions;Secondary organic aerosol AB - Understanding the formation mechanisms of secondary air pollution is very important for the formulation of air pollution control countermeasures in China. Thus, a large-scale outdoor atmospheric simulation smog chamber was constructed at Chinese Research Academy of Environmental Sciences (the CRAES Chamber), which was designed for simulating the atmospheric photochemical processes under the conditions close to the real atmospheric environment. The chamber consisted of a 56-m3 fluorinated ethylene propylene (FEP) Teflon film reactor, an electrically-driven stainless steel alloy shield, an auxiliary system, and multiple detection instrumentations. By performing a series of characterization experiments, we obtained basic parameters of the CRAES chamber, such as the mixing ability, the background reactivity, and the wall loss rates of gaseous compounds (propene, NO, NO2, ozone) and aerosols (ammonium sulfate). Oxidation experiments were also performed to study the formation of ozone and secondary organic aerosol (SOA), including α-pinene ozonolysis, propene and 1,3,5-trimethylbenzene photooxidation. Temperature and seed effects on the vapor wall loss and SOA yields were obtained in this work: higher temperature and the presence of seed could reduce the vapor wall loss; SOA yield was found to depend inversely on temperature, and the presence of seed could increase SOA yield. The seed was suggested to be used in the chamber to reduce the interaction between the gas phase and chamber walls. The results above showed that the CRAES chamber was reliable and could meet the demands for investigating tropospheric chemistry. ER -