Aerosol Physical–Optical Properties under Different Stages of Continuous Wet Weather over the Guangdong–Hong Kong–Macao Greater Bay Area, China

The spatiotemporal distributions and physical–optical properties of aerosols are great scientific significance for the study climate change atmospheric environment. What characteristics in constant high humidity? Continuous wet weather (CWW) is a special phenomenon that occurs frequently during late winter early spring South China. In this study, CALIPSO satellite data ERA5 MERRA-2 reanalysis used to analyze aerosol optical total 68 CWW processes from 2012 2021 Guangdong–Hong Kong–Macau Greater Bay Area (GBA). We attempt explore variations meteorological conditions before-stage, wet-stage, after-stage under different humidity levels. results show prevailing wind direction northeasterly temperature lower influence cold pressure before-stage. Moreover, depth (AOD) mainly regional transport. During clean ocean airflow causes AOD remain at low level, whereas increase significantly. wet-stage ends with coldness when it controlled by again. circulation similar However, remarkable feature there inversion layer, which significant AOD. This reveals three stages mechanism factors on aerosols, can provide basis future.