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      Temperature Inversion and Particulate Matter Concentration in the Low Troposphere of Cergy-Pontoise (Parisian Region)

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      Atmosphere
      MDPI AG

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          Abstract

          This study aims to elucidate the influence of meteorological conditions on particle levels in Cergy-Pontoise. It explores the temporal variability of PM10 pollution days by associating them with the vertical temperature profile derived from conventional radiosondes from 2013 to 2022 (regional station). The results indicate that nearly 80% of exceedance days were associated with thermal inversions, primarily observed in winter and typically lasting 1 to 3 days. Analysis of winter thermal inversion characteristics suggests that those linked to pollution primarily occur near the ground, with higher intensity in December (12.1 °C) and lower in February (10.3 °C). Persistent inversions (extended nocturnal by diurnal inversion) account for 91.4% of the total inversions associated with high concentrations. Captive balloon soundings and temperature measurements at different altitudes were conducted during the winter of 2022/2023 to clarify thermal inversion in the Oise Valley at the center of Cergy-Pontoise. The results highlight three nocturnal wind circulation mechanisms in the valley, including downslope flow, circulation influenced by an urban heat island, and mechanical air evacuation under an inversion layer towards the less steep East side of the valley. Analysis of PM with the temperature gradient in the Oise Valley shows a significant correlation, suggesting an increase in concentrations during locally detected inversions and a decrease during atmospheric disturbance.

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          Aerosol and boundary-layer interactions and impact on air quality

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            Cold-Air-Pool Structure and Evolution in a Mountain Basin: Peter Sinks, Utah

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              Relationship between particulate air pollution and meteorological variables in Utah's Salt Lake Valley

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                Author and article information

                Contributors
                Journal
                ATMOCZ
                Atmosphere
                Atmosphere
                MDPI AG
                2073-4433
                March 2024
                March 12 2024
                : 15
                : 3
                : 349
                Article
                10.3390/atmos15030349
                4b28a0a6-37ce-452b-91c7-87b921f9258c
                © 2024

                https://creativecommons.org/licenses/by/4.0/

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