Scattering Properties Of The Cirrus At3mm Wavelength

On the basis of a great deal of research, the microscopic and macroscopic characteristics of cirrus clouds are summed up, and due to the detection data of foreign aircraft、satellite and probe, two different models are built in this paper. The first model is spherical equivalent cirrus model, this model contains supercooled droplets and the ice spheres have air bubbles in them, the Maxwell-Garnet theory is used to calculate the equivalent dielectric constant of the crystals, and then the Mie solution is used to get the scattering properties of the ice spheres, after that, the relationship of radar equivalent reflectivity factor Ze and ice water content IWC is founded at35G、94G, in this model, and the result is compared with the equations of Hogan etc. The compare reveals that the air bubbles have very slight effects on the retrieval of Ze-IWC, but the supercooled droplets’influence is large enough to be considered in the cirrus model. The other model is complex crystals doped model, the air bubbles are neglected, and8kinds of particles in cirrus are modeled due to the mathematical expressions, then the hybrid surface integral equations of medium are established, next to that, the integral equations are solved with MOM. Then, the average RCS of these different particles are obtained in order to get Ze-IWC relationship, compared with the equations of Hogan、Liu and Protat, the Ze-IWC in this paper can be relied on at94G for millimeter wave radars.