积层混合云数值模拟研究（I）──模式及其微物理过程参数化

THE NUMERICAL SIMULATION STUDY OF CONVECTIVESTRATIFORM MIXED CLOUD, PART(I)─THE MODEL AND PARAMETERIZATION OFMICROPHYSICAL PROCESSES

用积云对流速度场叠加辐合场的方法建立了一个二维平面对称积层混合云数值模式，以用于模拟研究层状云和嵌入其内的对流云组成的混合云。模式动力场计算以一种新的方法求解（Ｖ，θ，π＇）为基本变量的深对流滞弹守恒型方程组。云中微物理过程考虑了６种水质并使用双变参数谱描述和采用更为合理的粒子谱。为了便于与实测雷达回波强度和结构比较，模式可以计算雷达观测模式云的回波强度。

2-D slab-symmetric model of convective-stratiform mixed cloud is developed by superimposing convective cloud-size field on the convergence field.in order to simulate and study the mixed cloud consisting of stratiform cloud and convective clouds.A deep convective.anelastic and conservative system of equations with basic variables(V.θ,π')is solved by a new method to calculate dynamic field. The water substance in the cloud is dividded into 6 categorys and the microphysical processes are described in spectram with two variable parameters and more reasonable particle number/size distributions.To comparing with measured redar echo intensity and structure.the model may calculate echo intensity of the model cloud observed by radar.