Doppler Radar Data Cloud Model Numerical Experiments

The fully elastic three-dimensional convective storm model (IAP-CSM3D) developed by the Institute of Atmospheric Physics (IAP), use this model to simulate a strong convective storm that occurred in Hunan province on Apr.23th,2004. The distribution and evolution of macro-physical as well as micro-physical variations such as wind field structure, radar echo, water content, etc. in the storm were analyzed. The formation mechanism of hailstones in the storm was analyzed too. Indicates that he auto-convection of frozen drops and graupels (CNfh, CNgh) are the main sources of the hailstones in the strong convective storm studied in the paper, but the contribution of frozen drops is greater than that of graupels. Hailstones mainly depend on the processes of collecting supercooled water (CLch, CLrh) to grow. Compared with the observational data by the Doppler weather radar, analyzed the field structure. The results show that the changing of horizontal divergence observed by radar with height is consistent with the wind field structure of simulation. While observation of Doppler radar reflectivity and echo top are according to the simulation too.Cloud liquid water content is always one of the most important quantities in many subjects and operations. At present only the Vertically Integrated Liquid Map (VIL) can reflect the value of the water content in a multitude of radar products. In order to know the distribution of water substance inside the cloud body, the reflectivity observed by the Doppler weather radar was used to retrieve the water content, and established two display modes which are CAPPI and VCS. Calculation field is defined as the square grid area with the radar station as center, with the horizontal side length of 150km, with the height of 30km, and with the distinguish ability of lkm*lkm*lkmr To retrieve the case's water content in comparison with the water content from the numerical modeling, the result as the follow is indicated: the constant value line distribution of the retrieved water content is parallel to the simulated output as a whole no matter in the development stage or in the strong stage of the storm, and the strength in the storm center as well as the height position is consistent well, that reflect the storm structure on the whole and the retrieve effect is rather perfect.