Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• The Science of the total environment, 2023-07, Vol.881, p.163438-163438, Article 163438

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 <5 %. The results also revealed the average contribution of HONO formation from aged air parcels to atmospheric HONO could achieve to be ~63 % in average. [Display omitted] •New method to estimate the localized HONO dry deposition velocity v(HONO)•The aged pollution air parcels could be an important un-considered source of nocturnal HONO.•Setting up a parametrization to reflect the HONO formation from the aged air parcels