Chemical kinetics of near-surface ozone at a suburban location in India

Frontiers in Environmental Science

Environmental Science

Vijay P. Kanawade¹  Vijay Kumar Sagar²  Suvarna Fadnavis³  Asuri Lakshmi Kanchana⁴  Rabindra Kumar Nayak⁴ 

[1] Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, India;Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, India;National Remote Sensing Centre, Indian Space Research Organization (ISRO), Hyderabad, India;Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India;National Remote Sensing Centre, Indian Space Research Organization (ISRO), Hyderabad, India;

关键词: ozone;    chemical kinetics;    oxides of nitrogen;    production;    destruction;    advective transport;   

DOI  :  10.3389/fenvs.2023.1178833

 received in 2023-03-03, accepted in 2023-08-08,  发布年份 2023

来源: Frontiers

【 摘 要 】

The spatial gradient in near-surface ozone (O3) is controlled by its production, sink, and net transport (advection/convection and diffusive) in the atmosphere. In this work, we used continuous long-term measurements of O3, oxides of nitrogen (NOx = NO + NO2), and meteorological data in the suburban location of Shadnagar, India. Data analyses were performed to investigate the governing processes that control O3 variability on diurnal and seasonal time scales. The role of chemistry in O3 variability, including both formation and destruction processes, was investigated using known chemical kinetics and a radiative transfer model. The residual between observations and chemical estimation was further analyzed to examine the role of transport and unresolved processes/uncertainty in the dataset. The O3 residual was duly validated using model reanalysis data of O3 and meteorological parameters to further estimate the O3 transport. Our analyses show that the average net production and net transport of near-surface O3 are 3.18 and 0.87 ppbv/h, respectively, while horizontal advection is 0.01 ppbv/h in the daytime. The production of ozone was found to be dominant, indicating the influx of ozone at the site. Overall, our results highlight that spatio-temporal variability in near-surface ozone is strongly controlled by net production in Shadnagar and may be applicable in similar environments globally.

【 授权许可】

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Copyright © 2023 Sagar, Kanchana, Nayak, Fadnavis and Kanawade.