人工抑制上升气流对冰雹云降水影响的数值试验研究

Modeling Evaluation of Effects of Artificial Updraft Restraints in a Strong Hailstorm on Its Precipitation

利用三维对流风暴云数值模式,模拟研究了短时间施加人工抑制上升气流的方法对强冰雹云和降水发展的影响。结果表明,在雹云发展阶段的早期,对云中上升气流施加人工抑制将对冰雹云的发展和降水过程产生明显的影响,使地面降水量增加,尤其是使降雹量显著增加;而在云发展阶段的后期,这样的抑制不会导致地面降水明显的增加。当抑制强度足够大且范围较大时,只有在云发展到旺盛阶段时进行人工抑制才能使影响云的降雹量和固态降水总量明显减小。最后,文中还分析了人工抑制上升气流影响云中冰雹形成的微物理机制。

Using the 3-D convective storm numerical model(IAP-CSM3D),dynamical effects by means of artificial updraft restraint are introduced into some regions of modeling convective clouds during a short time period at different evolution stages and different areas of a hailstorm,to study physical processes which affect the precipitation formation of hailstorm.The results indicate that in the earlier stage of the development of a hailstorm,an artificial restraint with a common intensity can highly influence the development and precipitation of the hailstorm,increasing its surface precipitation,especially the hailfall amount,but in the later stage of the hailstorm development,the restraint has a small influence on the precipitation.When the restraint is quite strong and its range is very large,only at the vigorous stage the restraint can distinctively reduce the hailfall amount and other solid-state precipitation from the affected hailstorm.Finally,the mechanism for the effect of the updraft restraint of the hailstorm on micro-physical processes is analyzed.