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Air pollution deterioration prior to dissipation induced by complex topography: A case study in the Sichuan Basin, southwestern China
Atmospheric Research ( IF 4.5 ) Pub Date : 2025-03-15 , DOI: 10.1016/j.atmosres.2025.108071
Yuelin Liu , Guangming Shi , Fumo Yang
Atmospheric Research ( IF 4.5 ) Pub Date : 2025-03-15 , DOI: 10.1016/j.atmosres.2025.108071
Yuelin Liu , Guangming Shi , Fumo Yang
Severe air pollution in urban areas poses a significant threat to residents' health and has raised considerable concerns. The influence of topography on air pollution, particularly in mountainous regions, is substantial. The Sichuan Basin (SCB), known as one of China's most polluted areas, exhibits complex topography that interacts synergistically with weather conditions and anthropogenic emissions to affect air pollution levels. Previous studies have primarily focused on the impact of the Tibetan Plateau on the SCB, while paying less attention to the role of complex terrain within the basin. In this study, an episode was investigated to figure out factors contributing to pollution deterioration prior to dissipation at Hechuan, a city located on the leeward side of parallel ridge-valleys in eastern SCB. Our findings indicate that enhanced vertical advection and suppressed vertical diffusion played dominant roles in pollutant accumulation rather than horizontal transport during the studied episode, which was primarily influenced by the combined effects of airflow crossing parallel valley-ridges and topography. When crossing airflow was weak, cold air concentrated near ground level leading to temperature inversion and weak downdrafts. As the crossing airflow intensified, gravity waves made an array of waves that facilitated downward transport of pollutants. As the crossing airflow further intensified, strong horizontal wind and updraft formed under cyclonic circulation facilitated pollutant dispersion. Considering the synergistic effects of synoptic circulation and topography on vertical dispersion ability at leeside valley-ridges, additional emission control measures are necessary to prevent further deterioration of air pollution prior to dissipation.
更新日期：2025-03-15
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