Smog Chamber Study on the Ozone Formation Potential of Acetaldehyde  

作　　者：Hailiang ZHANG Yongfu XU Long JIA Min XU 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [2]Department of Atmospheric Chemistry and Environmental Sciences,College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Advances in Atmospheric Sciences》2021年第7期1238-1251,共14页大气科学进展（英文版）

基　　金：This work was supported by the National Key R&D Program of China(2017YFC0210005);the National Natural Science Foundation of China(Nos.41875163,41875166 and 41375129).

摘　　要：Acetaldehyde is one of the important VOC species of O_(3)precursors in the atmospheric environment.The influences of relative humidity(RH)and initial VOC/NOx ratio(R_(CN))on the formation of O_(3)are studied in smog chamber experiments,and the MCM v3.3.1 mechanism of acetaldehyde is modified based on the experimental results.In low-RH conditions(RH=11.6%±1.1%),the O_(3)concentration at 6 h increases first and then decreases with the increase of R_(CN),and the R_(CN)at the inflection point of O_(3)concentrations is 3.2.In high-RH experiments(RH=78.8%±1.0%),variation of the O_(3)concentration at 6 h with R_(CN)is similar to that in low-RH experiments,but the R_(CN)at the inflection point is 2.8.RH has no significant effect on the O_(3)concentrations under low R_(CN)(<3),whereas it has a negative effect under high R_(CN)(>3).Compared with the experimental results,original MCM v3.3.1 greatly underestimates the O_(3)concentrations.Addition of both the photolysis process of peroxyacetyl nitrate and the photolysis process of HNO_(3)on the reactor surface into the original MCM can reduce the difference between the simulated O_(3)concentrations and the experimental results at 6 h from 24%−35%and 17%−49%to 6%−26%and 10%−42%under low-and high-RH conditions,respectively.The maximum incremental reactivity(MIR)of acetaldehyde simulated with the modified MCM is 4.0 ppb ppb−1 without considering the effect of other VOCs.

关 键 词：OZONE ACETALDEHYDE photochemical reaction MCM 

分 类 号：X51[环境科学与工程—环境工程] P421.3[天文地球—大气科学及气象学]