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Notable effects of crustal matters on HONO formation by the redox reaction of NO2 with SO2 in an inland city of China
Atmospheric Research ( IF 5.5 ) Pub Date : 2024-04-02 , DOI: 10.1016/j.atmosres.2024.107392 Mingkai Wang , Shenbo Wang , Ruiqin Zhang , Luqi Shang , Yunxiang Zhang
Atmospheric Research ( IF 5.5 ) Pub Date : 2024-04-02 , DOI: 10.1016/j.atmosres.2024.107392 Mingkai Wang , Shenbo Wang , Ruiqin Zhang , Luqi Shang , Yunxiang Zhang
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Nitrous acid (HONO) is a vital precursor of the hydroxyl radicals, which plays a significant role in atmospheric chemistry. HONO can be produced by the redox reaction of NO with SO. However, this reaction has often been neglected in previous studies on the HONO sources. To study this reaction on HONO production, continuous observation was carried out for one year in an inland city of China, and a sandy haze process was selected, divided into clean days (CD) and sand haze days (SHD). The mean HONO concentrations increased from 0.8 ± 0.4 ppb (CD) to 1.4 ± 1.0 ppb (SHD) during the nighttime. Since the rate of HONO sinks higher than that of sources, other elevation sources may contribute to the nighttime HONO concentration. In addition, the daytime HONO concentrations during the SHD periods also increased by 0.2 ppb, primarily due to the elevated photolysis of nitrate (0.20 ppb/h) and unknown sources (0.20 ppb/h) compared to the CD period. The positive correlations between HONO with NO, SO, particle pH, and SO indicate that HONO might be formed through the NO and SO redox reaction, and the calculated HONO production rates increased by two orders of magnitude under high pH conditions during the SHD period. In particular, on a heavily polluted SHD, this reaction explained 5% and 22% of HONO formation during the daytime and nighttime, respectively. In short, the NO and SO redox reaction may be more critical in high pH regions/periods and thus cannot be ignored when analyzing the HONO sources.
更新日期：2024-04-02
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