.png){kind=icon}
.png){kind=icon}
Return
Interplay of chemistry, meteorology, and transport in modulating Surface ozone over a tropical coastal semi-urban site in Southern India
.png){kind=icon}
PRE
AI
R
S
M
T
S
DOI：10.1007/s10874-026-09493-w.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Tropospheric ozone (O3) pollution in urban regions has fueled numerous studies due to its far-reaching impacts on health, agriculture, and the climate. In this study, the variability of surface O3 and the roles of distinct physical and chemical drivers were investigated at a tropical coastal semi-urban site in southern peninsular India using observations collected from February 2021 to February 2023. The results revealed higher mean O3 concentrations during premonsoon due to stronger photochemistry. The lower seasonal amplitude (24%) of O3 compared to other coastal/urban Indian locations suggests a strong reservoir of O3 throughout the year at this tropical site. Furthermore, the influence of atmospheric chemistry on O3 variations is examined using photolytic rate constants for NO2 to estimate the Leighton ratio (Φ) (the ratio of O3-production to O3-loss rate) and the period of its deviation from unity. The overall Φ ranged from 0.5 to 1.9, and the average net production of O3 was ~ 13.8 ± 5.2 ppbv h− 1. The short-scale changes in O3 and NOx concentrations were governed by the mesoscale sea-land breeze circulation. The role of chemical, meteorological processes, and transport pathways in controlling surface O3 concentrations was further demonstrated by evaluating three distinct high O3 events. The Copernicus Atmosphere Monitoring Service model successfully reproduced the observed O3 variability; however, absolute O3 concentrations were typically overestimated, suggesting issues with the modeled processes and/or emission inventories.
Keywords:
Surface ozone
Sea-Land breeze circulation
Photo-stationary state
Coastal urban location
CAMS reanalysis
Urban pollution.
Journal
IF:
1.8
Papers:
979
Citations:
1.4K
Organization
Cited Papers