  The interaction of aerosol-cloud-precipitation has an important impact on the
global climate. The understanding of this issue is related to the uncertainty
of climate change prediction. The traditional indirect effect of aerosols
suggests that when the number of aerosols increases, it will act to suppress
precipitation. However, recent studies on satellite observations have found
that aerosols are positively correlated with precipitation, which is contrary
to conventional views. This study attempts to use the A-Train satellite product
to verify the correlation between aerosol and precipitation, and further
reveals the possible physical mechanism of the positive relationship between
aerosols and precipitation in satellite observations through the
three-dimensional structure of clouds. The study found that the precipitation
intensity is positively correlated with the aerosol optical depth, while the
relationship between the cloud droplet concentration and the precipitation
intensity is related to the liquid water path; and when the number of aerosols
increases, the radar reflectance spectrum is widened, and the precipitation
increases, while the cloud droplet concentration shows the opposite phenomenon.
It can be concluded that the possible cause of positive correlation between
aerosol and precipitation is the negative correlation between CDNC and AOD.
