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<p>Ozone (O<sub>3</sub>) in the troposphere is critically important because it serves as a significant oxidant, playing a vital role in atmospheric chemistry and influencing various environmental and health impacts. Several factors impact O<sub>3</sub> formation which include precursor concentrations, meteorological conditions, and transport. In the present study, a rural observational site located in Gadanki (13.5°N, 79.2°E), India, has been identified as a NO<sub>x</sub>-limited regime, which is a common photochemical processing regime for rural atmospheres, using the O<sub>3</sub> production regime indicator (Θ) value. The Θ value approached 0.01 during the daytime in all seasons, indicating a different O<sub>3</sub> production regime compared to urban atmospheres, which are generally Volatile Organic Compounds (VOC)-limited. Subsequently, efforts have been made to understand the role of VOC and NO<sub>x</sub> concentrations, along with meteorological conditions and transport, in quantifying the seasonal variation of O<sub>3</sub> formation in terms of VOC/NO<sub>x</sub> sensitivity at the observational site using the photochemical model O<sub>3</sub> Isopleth Plotting Package (OZIPR). The VOC cross-over points obtained from the O<sub>3</sub> isopleth diagrams using the OZIPR model have shown a significant correlation with O<sub>3</sub> Formation Potential (OFP) and Propylene Equivalent Concentration (PEC) values, supporting the variability in O<sub>3</sub> formation in most of the seasons at the observational site. Additionally, the highest O<sub>3</sub> concentration measured in the summer season is also well reproduced by the VOC cross-over correlations with the OFP and PEC values. Biomass burning VOCs have been found to be the highest contributors to the O<sub>3</sub> formation due to their higher emission in the summer season and higher contribution to both OFP and PEC.&#xa0;</p> Graphical Abstract <p></p>

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Understanding the effect of seasonal variability of VOCs and NOx on the ozone budget and its photochemical processing over a rural atmosphere

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Sreenivas Sindhu,
  • Chaithanya D. Jain,
  • Madineni Venkat Ratnam

摘要

Ozone (O3) in the troposphere is critically important because it serves as a significant oxidant, playing a vital role in atmospheric chemistry and influencing various environmental and health impacts. Several factors impact O3 formation which include precursor concentrations, meteorological conditions, and transport. In the present study, a rural observational site located in Gadanki (13.5°N, 79.2°E), India, has been identified as a NOx-limited regime, which is a common photochemical processing regime for rural atmospheres, using the O3 production regime indicator (Θ) value. The Θ value approached 0.01 during the daytime in all seasons, indicating a different O3 production regime compared to urban atmospheres, which are generally Volatile Organic Compounds (VOC)-limited. Subsequently, efforts have been made to understand the role of VOC and NOx concentrations, along with meteorological conditions and transport, in quantifying the seasonal variation of O3 formation in terms of VOC/NOx sensitivity at the observational site using the photochemical model O3 Isopleth Plotting Package (OZIPR). The VOC cross-over points obtained from the O3 isopleth diagrams using the OZIPR model have shown a significant correlation with O3 Formation Potential (OFP) and Propylene Equivalent Concentration (PEC) values, supporting the variability in O3 formation in most of the seasons at the observational site. Additionally, the highest O3 concentration measured in the summer season is also well reproduced by the VOC cross-over correlations with the OFP and PEC values. Biomass burning VOCs have been found to be the highest contributors to the O3 formation due to their higher emission in the summer season and higher contribution to both OFP and PEC. 

Graphical Abstract