Aging of pollution air parcels acts as the dominant source for nocturnal HONO

Atmospheric HONO acts as a major source for OH radicals in polluted areas, playing an important role in formation of secondary pollutants. However, the atmospheric HONO sources remain unclear. Here we propose that the heterogeneous reaction of NO2 on aerosols during aging processes acts as the domin...

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Published in:The Science of the total environment 2023-07, Vol.881, p.163438-163438, Article 163438
Main Authors: Zhang, Wenjin, Ren, Yangang, Zhang, Chenglong, Liu, Pengfei, Xue, Chaoyang, Ye, Can, Liu, Chengtang, Wang, Jinhe, Zhang, Yuanyuan, Liu, Junfeng, Song, Yifei, Feng, Yinchang, Mu, Yujing
Format: Article
Language:English
Subjects:
Aging of air parcels
Dry deposition velocity
HONO
HONO/NO2
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Summary:Atmospheric HONO acts as a major source for OH radicals in polluted areas, playing an important role in formation of secondary pollutants. However, the atmospheric HONO sources remain unclear. Here we propose that the heterogeneous reaction of NO2 on aerosols during aging processes acts as the dominant source for nocturnal HONO. Based on the nocturnal variations of HONO and related species in Tai'an city of China, we firstly developed new method to estimate the localized HONO dry deposition velocity (v(HONO)). The estimated v(HONO) of 0–0.077 m/s was in a good agreement with the reported ranges. Additionally, we set up a parametrization to reflect the HONO formation from the aged air parcels based on the variation of HONO/NO2 ratio. The detailed variation of nocturnal HONO could be well reproduced by a complete budget calculation coupled with above parameterizations, with the difference between the observed and calculated HONO levels being
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2023.163438