Study on Microphysical Structure of an Autumn Stratus in Shijiazhuang Region

摘要

A case of using PMS to detect microphysics characteristics of stratus and aerosol in October, 2010 by the Weather Modification Office of Hebei Province is analyzed. The results show that Stratus is located in the altitude of 600-1100m in Shijiazhuang, and the cloud droplet number concentrations of the center position is 6.02 × 10~7 m~(-3). In the vertical direction aerosol number concentration will decrease as the altitude rises. Atmospheric environmental the number concentration and average diameter of aerosol are the same trend, but the reverse is true for within clouds. With the altitude changes the drops spectrum distribution within status have differences. The drops spectrum concentrations in diameter of 0.1-1.0μm will decrease with rising altitudes. The droplet (>3.0μm) number concentrations are highest in the middle cloud, followed by top and bottom within clouds. The aerosol number concentrations at the bottom of the cloud are positively correlated with cloud droplet number concentrations.