Simulation And Analysis Of Strong Convective Weather Based On WRF Model And Satellite Data

Using the CloudSat satellite data and the WRF mesoscale model, combined with NCEP reanalysis data and FY2G stationary meteorological satellite data, a deep convective weather process occurred in the Huanghuai area was studied. The weather characteristics, dynamic structure, the temporal and spatial evolution characteristics of hydrometeors in the severe convective weather process were analyzed emphatically. The results show that: (1) The warm and humid southwest airflow in the low level and the northwest dry and cold air flow in the high-level, and the high-level divergence and the low-level convergence, such synoptic configuration were favorable to the development and enhancement of the weather system and also was the important lifting mechanism to trigger the release of unstable energy. (2)Based on analyzed the CloudSat satellite data, it was found that the ice effective radius, the ice number concentration and the ice water content in the deep convective cloud nuclei (DCC) were located near the height of 12km, this area may be the critical zone, where in the deep convective cloud the ice crystals grown through sublimation, riming and aggregation to generate large ice particles. (3) Combined with the NCEP reanalysis data, it was found that there was an oblique ascending airflow axis in the cloud, and large ice crystals are transported along the ascending airflow axis to the critical zone. (4) The WRF model showed a favorable effect for this process and showed the distribution characteristics of hydrometeors. An accumulation of supercooled water and hail cycle growth characteristics in the cloud were found. Snow crystals were generated through collision and coalescence of ice crystals which were generated by nucleation of ice nucleus, and graupel was generated by the snow crystal aggregated freeze droplets and with supercooled rain drops freezing. Then graupel transformed into hail by cycle of growth, hail would shoot when hail increased to large enough. The snow crystals and accumulation of supercooled water is critical to the generation and growth of the grape and hail.