摘要
利用NCEP再分析资料和CAMS中尺度云分辨模式,对2010-04-20—04-21发生在山西省的大到暴雨、局部强对流天气过程进行了客观模拟,主要得出以下4点结论：①对比2010-04-20T08：00—04-21T08：00的24h降水预报与实况可见,山西省中南部降水情况与实况值接近,山西省北部降水情况略大于实况值,模拟域中降水量的最大值略小于实况值,雨带分布与实况非常接近。②2010-04-20T13：00—04-20T17：00,云系处于发展阶段,云内含水量和雪含水量呈增加趋势。其中,云水在2010-04-20T17：00,2.5km处达到最大值0.24g/kg,顶高为3.5km,分布在1.2~3.9km处,雪最大值为0.25g/kg,位于0℃层上方;雨滴在暖层,雪和云水的增大区对应着雨的增加区,雪和云水是雨滴形成的主要粒子,且雪和云水是降水的主要原因;云系进入消散阶段,至2010-04-21T10：00降水基本结束。③云系在2010-04-20T10：00开始发展,2010-04-20T18：00到达旺盛阶段,随后开始逐渐消散,至2010-04-21T10：00云体基本消散。垂直上升气流的速度多为0.1m/s,最大为0.5m/s,符合层状云系的特征。④在8km以上的区域,雪会通过凝华、雪花与冰晶碰并和冰晶向雪的自动转化等方式增长。其中,凝华增长起主要作用,最高所占比例为100%.在5~8km的区域,雪花通过凝华增长;在4~5km的区域,雪花通过凝华和冰晶向雪的自动转化增长;在3~4km的区域,雪花通过凝华和结淞增长,凝华增长最高所占比例为100%.
To analysis scale cloud resolving model data and CAMS using NCEP, of 2010-04-20 04-21 in Shanxi province to arrive greatly rainstorm, local strong convection weather process of objective simulation, the main draw the following 4 conclusions： 1. The comparison of 2010-04-20T08：00- 04-21T08：00 24h precipitation forecast and live visible, precipitation and live province Shanxi South central values close to the northern part of Shanxi Province, precipitation is slightly larger than the real value, the analog domain precipitation maximum value is slightly less than the real value, distribution of rainfall and live very close to. The 2010-04-20T13：00- 04-20T17：00, cloud in the development stage, liquid water content and water content of snow increased. Among them, the cloud water in 2010-04-20T17：00, 2.5 km and reached a maximum value of 0.24g/kg, top height is 3.5km, distributed in 1.2 ~ 3.9km, snow a maximum value of 0.25 g/kg, located at 0 DEG C layer; rain in the warm layer, increase the area of snow and cloud water increases the corresponding rain, snow and cloud water is the main particles rain droplet formation, and snow and cloud water is the main reason of precipitation; cloud into the dissipation stage, to the basic end of 2010-04-21T10：00 precipitation. The clouds began to develop in the 2010-04-20T10：00, 2010-04-20T18：00 to reach the exuberant stage, then began to dissipate, to 2010-04-21T10：00 cloud disappeared. Vertical updraft speed is 0.1 m/s, maximum was 0.5m/s, characteristics with stratiform clouds. The region above 8km, the snow will grow by sublimation, snow and ice particles collide with and ice to snow automatic conversion of way. Among them, sublimation growth plays a major role, the highest proportion of 100%. in the 5 ~ 8Km region, snow through sublimation growth; in 4 ~ 5km region, snow and ice crystals by sublimation of automatic conversion to snow growth; in 3 ~ 4 km region, snowflake growth through sublimation and node song, sublimation growth of the highest proportion of 100%.
出处
《科技与创新》
2015年第3期15-18,共4页
Science and Technology & Innovation
关键词
冷锋云系
人工引晶催化
数值模拟
降水量
cold front cloud system
artificial seeding catalyst
numerical simulation
the amount of precipitation
