Simulation of the depolarization ratio of adiabatic water clouds by lidar

We have simulated the depolarization signal in adiabatic water clouds due to the occurrence of multiple scattering when measuring the microphysics characteristics using depolarization lidar. The number density of the adiabatic water clouds is constant in the vertical direction. The liquid water content and the effective radius increase nonlinearly with the height, and the varying rule is controlled by the barometric pressure, temperature, and the thermodynamic formulas. The wavelength of the lidar is chosen as 0.355 mu m. From the computed results, we can see that the depolarization ratio of the adiabatic clouds increases with the penetration depth of the clouds, and increases with the increase in the receiving field of view angle (FOV). There are great differences between the adiabatic water clouds and the homogeneous clouds in the varying rules of the depolarization ratio. The effective radius of the clouds with a higher cloud base height is less than that of the clouds with a lower cloud base, and the depolarization ratio is also small with the same number density and observation conditions.