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CN 11-1768/O4

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基于飞机观测的华北积层混合云降水微物理特征的数值模拟研究
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中国科学院大气物理研究所

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国家重点研发专项


Numerical Simulation Study on Microphysical Characteristics of Stratiform Clouds with Embedded convections in Northern China based on Aircraft Measurements
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1.Institute of Atmospheric Physics,Chinese Academy of Sciences;2.Beijing Weather Modification Office

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    摘要:

    基于2009年5月1日华北积层混合云2架飞机观测数据分析,使用中尺度模式WRFV3对此次过程的积云区和层云区的微物理特征和转化过程进行数值模拟比较研究。飞机观测数据分析表明,此次积层混合云中的层云区和积云区冰粒子形状和形成过程有明显差别,层云区的粒子形状组成比较复杂,包含针状、柱状和辐枝状等,而积云区主要以辐枝状粒子为主,聚并、凇附过程明显,且越靠近回波中心区域,聚并和凇附过程越强。数值模式能较好地模拟出此次积层混合云降水过程的基本特征,包括云带分布、飞行路径上降水粒子的数浓度和液态水含量等。数值模拟结果表明,云水相对丰富、上升气流强的层云区凇附过程较强,产生的雪在低层融化为雨水,为后期高层形成的雪和霰提供丰富的液态水,能发展成对流较强的积云区,存在播种-供给机制。在积云区,水成物的比例从大到小依次为雪(51.9%)、霰(31.0%)和雨水(16.0%);雪和霰在高层通过凝华过程增长,在下落过程中碰并雨水进一步增长,经过零度层融化成雨水。云水较少、上升气流弱的层云区将保持层云的状态,层云区水成物的比例从大到小依次为雪(90.4%)、雨水(6.1%)、冰晶(3.5%);高层冰晶和雪通过凝华过程增长,雪在零度层下融化为弱的降水。

    Abstract:

    To characterize the microphysical characteristics and transformation process of stratiform cloud with embedded convections, a case study was performed using WRFV3 model based on two aircraft measurements on May 1st, 2009. The aircraft observation results showed that the shapes and formation process of ice particles existed significant difference between the regions of stratiform cloud and embedded convection . Compared to the embedded convection region, the shapes of ice crystals in the stratiform cloud was more complicated, including the needle column, capped column and dendrite type. However, the dendrite type ice crystals dominated in the embedded convection region and their growth was controlled by aggregation and riming processes. Overall, the results indicated that the basic characteristics of this stratiform cloud with embedded convections simulated by the WRF model were in good agreement with the aircraft observations, including cloud distribution, LWC and numerical concentration on the flight route, etc. The simulated results showed that in the stratiform cloud, with higher cloud water content and bigger W, could develop into embedded convection because of strong riming process. The hydrometeors of snow, graupel and rain water in the clouds account for 51.9%, 31.0%, 16.0%, respectively, cloud ice and cloud water accounts for very little. In higher level, snow and graupel grew through deposition process. In lower level, they grew through riming process and melted into rain. Stratiform cloud with lower cloud water content and smaller W, would stay to be stratiform cloud. The hydrometeors of snow, rain water and cloud ice account for 90.4%, 6.1% and 3.5%. The ice and snow grew through depositon process, and melted into rain in lower level.

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  • 收稿日期:2019-01-23
  • 最后修改日期:2019-03-18
  • 录用日期:2019-07-05
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