刘香娥,高茜,何晖,马新成,毕凯. 2020. 一次积层混合云系垂直结构和降水机制的飞机观测资料分析与数值模拟[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.004
一次积层混合云系垂直结构和降水机制的飞机观测资料分析与数值模拟
Analysis of Aircraft Observation Data and Numerical Simulation Researches about Vertical Structure and Precipitation Mechanism on stratiform clouds with embedded convections
投稿时间:2018-10-15  修订日期:2019-07-03
DOI:10.11676/qxxb2020.004
中文关键词:  积层混合云 飞机探测 数值模拟
英文关键词:stratiform cloud with embedded convections, aircraft observation, numerical simulation
基金项目:国家重点基础研究发展计划,北京市自然科学基金,国家自然科学基金
作者单位E-mail
刘香娥 北京市人工影响天气办公室 lxe3399@163.com 
高茜 北京市人工影响天气办公室 gaoqianbjwm@163.com 
何晖 北京市人工影响天气办公室 hehui@bjmb.gov.cn 
马新成 北京市人工影响天气办公室 415597499@qq.com 
毕凯 北京市人工影响天气办公室 becare2008@163.com 
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中文摘要:
      积层混合云是影响北京地区的重要降水云系,文中运用飞机探测资料结合中尺度数值模式WRF,对2014年9月23日发生在北京地区的一次积层混合云系的垂直结构和降水机制进行了探测资料分析和数值模拟研究。通过分析云系的雷达回波演变,发现云中的对流泡没有出现爆发式增长,回波在垂直方向上增长不明显,[结论]此次过程属于积-层水平混合型云系降水。飞机探测资料分析显示,上下午探测云系的液态水含量都不高(最大低于1g m-3);在云系不同高度,飞机探测到的冰晶形状主要有板状、针柱状、辐枝状和不规则形状;[结论]由于云中过冷水含量相对较少,聚合冰晶的数量明显多于淞附冰晶,冰晶的聚合过程是云中粒子增长的主要过程。对模拟云系垂直微物理结构和降水粒子的源汇项分析得到:在高层,由凝华产生的冰晶和雪晶在过冷水含量较少的环境中不断聚并、长大并下落,云系中霰的含量很少,增大的冰晶和雪晶下落至零度层附近融化是产生地面降水的主要机制;此外,[结论]在融化层附近,雨滴捕获云滴不断长大并下降至地面也是地面降水的另一重要源项。
英文摘要:
      Stratiform clouds with embedded convections are important precipitation systems in Beijing. In this paper, aircraft observation data combined with the mesoscale numerical simulation model WRF are used to analyze a stratiform cloud with embedded convections precipitation process in Beijing area on September 23, 2014. By analyzing the radar echo evolution of the cloud system, it is found that there is no explosive growth in the convective bubble in the cloud, and the echo is not obvious in the vertical direction, so this process belongs to the horizontal mixed cloud system precipitation. The analysis of aircraft detection data shows that the liquid water content of the cloud system in the morning and afternoon is not high (the maximum is less than 1g m-3); At different heights of the cloud system, the shape of ice crystals detected by the aircraft mainly consists of plate, needle column, radial as well as irregular. Due to the relatively small amount of supercooled water in the cloud, the number of aggregated ice crystals is significantly more than that of the attached ice crystals. The polymerization process of ice crystals is the main process of particle growth in the cloud. The analysis of the source and sink terms of the vertical microphysical structure of the cloud system and the precipitation particles is obtained: at the upper level, the ice and snow crystals produced by the condensate are continuously aggregated, grown and fallen in an environment with less supercooled water content,. The graupel content is very small, and the melting of ice and snow crystals near the zero-degree layer is the main mechanism for generating ground precipitation. In addition, near the melting layer, raindrops catching cloud droplets and growing to the ground are another important source of ground precipitation.
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