An Observational Study of Atmospheric Ice Nuclei Concentration in Spring and Summer in Shenyang

Observation and research on the distribution of atmospheric ice nuclei (IN) concentration was started in 2010, in order to understand the temporal and spatial distributions of IN concentrations in Shenyang area. Ground measurement was made by Bigg mixing chamber and sampling of IN aerosols was done by membrane filter method. Airborne IN measurements were made on the artificial precipitation aeroplane Y-12 which being lended by Wheather Modification Office of Liaoning Province during April-September 2011. Sampling membrane filter processing conditions is unified in the activation temperature about -15℃ and from ice saturation to 3% water supersaturation. According to some of the observation data, IN concentration and its temperature distribution parameters in spring and summer in Shenyang is given. The monthly variation of IN concentrations from March-June and the distribution characteristics in different weather conditions are analyzed. And the changes of IN concentration with particle size and height are given primiparously.