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<p>Aerosol Optical Depth (AOD) is a crucial parameter for elucidating the characteristics of atmospheric aerosol particles, and number of studies investigated the factors influencing AOD, but focusing solely on near-surface variables is inadequate for comprehending the spatial distribution of aerosols. This study examines the impact of both near-surface and upper-air meteorological factors on aerosols within the Yangtze River Delta region of China. To quantify near-surface aerosol extinction coefficients (AOD<sub>surf</sub>), we integrated surface horizontal visibility measurements. Furthermore, the planetary boundary layer height (PBLH) was obtained from the Weather Research and Forecasting (WRF) model, along with near-surface and upper-air meteorological parameters, including relative humidity (RH), wind speed (WS), and temperature difference (TD). Pearson correlation analysis and random forest (RF) model were employed to analyze correlations between meteorological factors and AOD/AOD<sub>surf</sub>. The findings indicate a negative correlation between PBLH/WS and AOD/AOD<sub>surf</sub>, and a positive correlation between RH/TD and AOD/AOD<sub>surf</sub>, and correlation coefficients show a seasonal tendency. Generally, meteorological factors at and below the 900&#xa0;hPa-atmospheric pressure surface exert greater influences on AOD<sub>surf</sub>, and meteorological factors at and below the 850&#xa0;hPa-atmospheric pressure surface significantly affect AOD. These findings highlight the necessity of incorporating both near-surface and upper-air variables in aerosol research.</p>

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Influences of Meteorological Factors on Aerosol Optical Depth and Near-Surface Aerosol Extinction Coefficient

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Geng Wei,
  • Shuyue Wang,
  • Zhen Gao,
  • Bo Liu,
  • Yong Zha

摘要

Aerosol Optical Depth (AOD) is a crucial parameter for elucidating the characteristics of atmospheric aerosol particles, and number of studies investigated the factors influencing AOD, but focusing solely on near-surface variables is inadequate for comprehending the spatial distribution of aerosols. This study examines the impact of both near-surface and upper-air meteorological factors on aerosols within the Yangtze River Delta region of China. To quantify near-surface aerosol extinction coefficients (AODsurf), we integrated surface horizontal visibility measurements. Furthermore, the planetary boundary layer height (PBLH) was obtained from the Weather Research and Forecasting (WRF) model, along with near-surface and upper-air meteorological parameters, including relative humidity (RH), wind speed (WS), and temperature difference (TD). Pearson correlation analysis and random forest (RF) model were employed to analyze correlations between meteorological factors and AOD/AODsurf. The findings indicate a negative correlation between PBLH/WS and AOD/AODsurf, and a positive correlation between RH/TD and AOD/AODsurf, and correlation coefficients show a seasonal tendency. Generally, meteorological factors at and below the 900 hPa-atmospheric pressure surface exert greater influences on AODsurf, and meteorological factors at and below the 850 hPa-atmospheric pressure surface significantly affect AOD. These findings highlight the necessity of incorporating both near-surface and upper-air variables in aerosol research.