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Article Dans Une Revue ACS Earth and Space Chemistry Année : 2021

Evidence for Strong HONO Emission from Fertilized Agricultural Fields and its Remarkable Impact on Regional O 3 Pollution in the Summer North China Plain

Chaoyang Xue
Can Ye
Chenglong Zhang
  • Fonction : Auteur
Pengfei Liu
  • Fonction : Auteur
Rongrong Gu
  • Fonction : Auteur
Jingwei Zhang
  • Fonction : Auteur
Zhuobiao Ma
  • Fonction : Auteur
Xiaoxi Zhao
  • Fonction : Auteur
Wenqian Zhang
  • Fonction : Auteur
Gisèle Krysztofiak
  • Fonction : Auteur
Shengrui Tong
  • Fonction : Auteur
Likun Xue
  • Fonction : Auteur
Junling An
  • Fonction : Auteur
Maofa Ge
  • Fonction : Auteur
Yujing Mu

Résumé

Summertime HONO concentrations were synchronously measured at two (agricultural and nonagricultural) sites in the North China Plain (NCP). Daytime HONO (1.4 ± 0.6 ppbv) and HONO/NO2 ((12 ± 8)%) over the agricultural field after fertilization were found to be remarkably higher than those before fertilization, implying strong HONO emission from the fertilized fields. Synchronous enhancements of HONO and O3 after fertilization at both sites suggested that the emitted HONO accelerated the local and the regional O3 pollution. HONO budget analysis further revealed that its emission was significantly enhanced after fertilization. Soil HONO emission flux and its uncertainty were estimated and discussed. The estimated emission flux exhibited a distinct diurnal variation with a noontime maximum. The net OH production rate from HONO photolysis greatly exceeded that from O3 photolysis over the agricultural field, and their maximum ratio of 4.7 was obtained after fertilization. We provide field evidence that fertilized fields in the NCP act as a strong HONO source, which accelerates daytime photochemistry, leading to an increase of regional photo-oxidants such as O3. Considering the severe O3 pollution in the summer NCP and that the large area of the agricultural field is regularly treated with high fertilization amount in this region, HONO emission should be taken into account in the regional air quality deterioration.

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Chimie
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Dates et versions

hal-03173926 , version 1 (13-09-2021)

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Chaoyang Xue, Can Ye, Chenglong Zhang, Valéry Catoire, Pengfei Liu, et al.. Evidence for Strong HONO Emission from Fertilized Agricultural Fields and its Remarkable Impact on Regional O 3 Pollution in the Summer North China Plain. ACS Earth and Space Chemistry, 2021, 5 (2), pp.340-347. ⟨10.1021/acsearthspacechem.0c00314⟩. ⟨hal-03173926⟩
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