Oral or Poster

IAMAS

M04 - Cloud-Precipitation-Aerosol Studies

Variation Characteristics and Source Analysis of Cloud Condensation Nuclei at the Ridge of Liupan Mountain Located in Western China

Liupan Mountain experiences more than 150 foggy days each year ; therefore , it is a natural laboratory for studying clouds and fog .A cloud condensation nuclei counter is installed at the LPS Meteorological Station , where fog is frequently seen . The number of cloud condensation nuclei affects the concen - tration and initial size distribution of cloud droplets . During the atmospheric condensation process , the study of its macro - and micro - characteristics and evolution patterns is helpful for analyzing the conditions of catalytic operations . The analysis of the various charac - teristics and sources of CCN on LPS using counters , meteorological element data and reanalysis data can reveal the influence of CCN on cloud droplets , improve the techniques of weather modification and provide a research basis for the influence of mountains on CCN changes . In other words , CCN research is an important link in understanding the interactions between aerosols , clouds and climate . The Liupanshan area is an important water conservation area in southern Ningxia , and it is practical for carrying out background CCN observations in the local precipitation research and forecast . Two years of data on cloud condensation nuclei ( CCN ) measured at the Liupan Mountain ( LPS ) Mctcorological Station from August 2020 to November 2021 were analyzed in this study . The results show that the mean annual CCN concentration was 851 cm -3 and that the mean concentration of CCN increases with the supersaturation degree . The curves of the diurnal variation in CCN concen - tration show one peak and one valley , which correspond to the diurnal variation in the mixed - layer height and valley wind . Regarding scasonal variations , the CCN concentration , as well as the degree of internal mixing , is higher in the spring and winter , while the degree of external mixing is higher in the summer and autumn . The transport of CCN is closely related to the wind transport evolution , and the southeast and southwest sides of the LPS station contribute more to the CCN concentration in the spring and winter due to central heating in the wintertime . Though correlations between CCN concentration and pressure are scarce , the CCN concentration and temperature ( or humidity ) are positively ( or negatively ) correlated , especially in the spring . Furthermore , the 48- h backward trajectory analysis indicates that the sources in the northwest direction are a major contributor to the CCN concentration . The pollutants mainly came from the northwest and southwest sides , according to the analysis of potential sources using the PSCF and CWT approach . The study of CCN evolution ndcontributionareaisbeneficialforfurther research on the physical properties of cloud droplets , the influence of mountains on CCN changes and the role of CCN in terrain cloud precipitation , which are significant for the improvement of weather modification techniques .