Nature communications · 2020
Fast sulfate formation from oxidation of SO2 by NO2 and HONO observed in Beijing haze.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Wang Junfeng, Li Jingyi, Ye Jianhuai, Zhao Jian, Wu Yangzhou, Hu Jianlin, Liu Dantong, Nie Dongyang, Shen Fuzhen, Huang Xiangpeng, Huang Dan Dan, Ji Dongsheng, Sun Xu, Xu Weiqi, Guo Jianping, Song Shaojie, Qin Yiming, Liu Pengfei, Turner Jay R, Lee Hyun Chul, Hwang Sungwoo, Liao Hong, Martin Scot T, Zhang Qi, Chen Mindong, Sun Yele, Ge Xinlei, Jacob Daniel J
Аннотация
Severe events of wintertime particulate air pollution in Beijing (winter haze) are associated with high relative humidity (RH) and fast production of particulate sulfate from the oxidation of sulfur dioxide (SO2) emitted by coal combustion. There has been considerable debate regarding the mechanism for SO2 oxidation. Here we show evidence from field observations of a haze event that rapid oxidation of SO2 by nitrogen dioxide (NO2) and nitrous acid (HONO) takes place, the latter producing nitrous oxide (N2O). Sulfate shifts to larger particle sizes during the event, indicative of fog/cloud processing. Fog and cloud readily form under winter haze conditions, leading to high liquid water contents with high pH (>5.5) from elevated ammonia. Such conditions enable fast aqueous-phase oxidation of SO2 by NO2, producing HONO which can in turn oxidize SO2 to yield N2O.This mechanism could provide an explanation for sulfate formation under some winter haze conditions.