Abstract:

Based on the one-dimensional MISTRA (MIcrophysical STRAtus) boundary layer cloud model, the influence of ammonium sulfate aerosol with insoluble core on the microphysical characteristics of the boundary layer warm cloud was simulated.The turbulence energy flux in the boundary layer is an important factor affecting the development of warm clouds.The liquid water content, supersaturation and cloud droplet spectrum dispersion in the cloud increase with the height in the cloud.The standard deviation of cloud droplet spectrum is the main factor affecting the variation of cloud droplet spectrum dispersion.In the warm cloud development stage, the insoluble core will increase the supersaturation in the cloud, which will cause the cloud droplet spectrum widening to large scale end and small scale end.The standard deviation of the cloud droplet spectrum will increase, and the cloud droplet spectrum dispersion will increase with time.In the warm cloud weakening stage, the insoluble core will cause the cloud droplet number concentration of the large-scale end of the cloud to decrease, the cloud droplet spectrum becomes narrower, the standard deviation becomes smaller, the characteristics of decreasing dispersion of cloud droplet spectrum are weakened.

Key words: Boundary Layer, Spectral dispersion, MISTRA model, Cloud droplet size distribution, Insoluble nucleus