Analysis of the Characteristics of Atmospheric Self-Purification Capacity in the Main Urban Area of Jiangmen
Abstract：To provide data support for the scientific management of atmospheric pollution and ecological environmental protection in Jiangmen City, this study used meteorological observation data from 1993 to 2022 and environmental air quality monitoring data from 2014 to 2022 in the main urban area of Jiangmen to analyze the temporal trend characteristics of the atmospheric self-purification capacity index and its influencing factors, and to explore the correlation between atmospheric self-purification capacity and air quality. The results show that: (1) The atmospheric self-purification capacity in the main urban area of Jiangmen is strong throughout the year, which is conducive to the removal of atmospheric pollutants. (2) The annual average atmospheric self-purification capacity index in the main urban area of Jiangmen exhibits periodic oscillations with cycles of 4.3 and 10 years, showing an overall obvious upward trend. (3) The factors affecting the atmospheric self-purification capacity in the main urban area of Jiangmen, ranked by importance, are ventilation volume, mixing layer height, number of light wind days and large wind days, and atmospheric stability, while precipitation has no significant impact on the atmospheric self-purification capacity. (4) The atmospheric self-purification capacity has a certain influence on air quality; when the atmospheric self-purification capacity index increases, the AQI and PM2.5 mass concentration decrease accordingly, and the environmental air quality improves.
Keywords：Environmental MeteorologyAtmospheric Self-Purification Capacity IndexEEMD Method (Extreme Symmetric Mode Decomposition)Ventilation VolumeAir QualityJiangmen
Publication Date：2025-04-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 77-81 )