Abstract
The stability of the atmosphere plays an important role in changes in air pollutant concentrations. Stable atmospheric conditions cause pollutant concentrations to reach high values, which degrades the air quality in a particular region. This study aims to reveal the relationship between atmospheric stability indices/parameters (thermodynamic indices) and changes in air pollutant concentrations. Pollutant concentrations of PM10, PM2.5, SO2, NO2, CO, and O3 were statistically analyzed for a 10-year (2013-2022) period for nine air quality stations located in the megacity Istanbul. Based on national and international air quality standards, 145 episode days were determined for the days when these parameters exceeded the threshold values. Five stability indices (Showalter Index – SI, Lifted Index – LI, Severe Weather Index – SWEAT, K Index – KI, Totals Totals Index – TTI), and three stability parameters (Convective Available Potential Energy – CAPE, Convective Inhibition – CIN, Bulk Richardson Number – BRN) were used to determine the stability of the atmosphere for episode days. It has been found that in cases where air pollutant concentrations are high, the stability parameters reveal the stability of the atmosphere better than the stability indices. It was also found that there was at least one vertical inversion layer on 122 of the 145 episode days, these layers mostly (84%) occurred between the surface and 850 hPa levels, and the layer thicknesses were mostly between 0-250 m (84%).
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The author thanks the Turkish State Meteorological Service and the Turkish Ministry of Environment, Urbanization, and Climate Change for the data used in this study. Also, I would like to extend my heartfelt gratitude for the valuable feedback and comments provided by the anonymous reviewers. Their insights and suggestions have been immensely valuable in improving the quality and clarity of this research paper. I sincerely appreciate their time and expertise in reviewing my manuscript.
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Yavuz, V. An analysis of atmospheric stability indices and parameters under air pollution conditions. Environ Monit Assess 195, 934 (2023). https://doi.org/10.1007/s10661-023-11556-4
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DOI: https://doi.org/10.1007/s10661-023-11556-4