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ISSN 1006-9895

CN 11-1768/O4

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山东不同云系降水微物理参数特征
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作者单位:

1.山东省人民政府人工影响天气办公室;2.中国科学院大气物理研究所

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Characteristics of rain microphysical parameters for different rain types in Shandong Province
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Institute of Atmospheric Physics, Chinese Academy of Sciences

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    摘要:

    研究不同云系降水的微物理参数特征,对研究降水机制、人工影响天气、雷达定量测量降水、数值预报模式中微物理参数化方案的选择等都有一定意义。本文针对2015年济南地区的液态降水过程,基于微雨雷达资料,研究不同云系降水的微物理参数。在400m高度上,层状云降水0.02~0.2mm/h雨强样本数很大,但对累计降水量的贡献很小。混合云和对流云降水在大粒子端数浓度较高。在垂直方向上,层状云降水中的粒子的尺度较集中,中值体积直径D0平均在1mm左右,随高度的变化不大。对流云降水在雨强大于20mm/h时,强垂直气流(包括上升气流和下沉气流)对粒子直径的影响较大,进而影响空中微雨雷达反演降水参数的数据质量。而垂直气流的影响对层状云降水影响较小,在层状云降水时,MRR可以用来分析零度层亮带以下雨滴谱在垂直方向上的演变。

    Abstract:

    The study of the characteristics of microphysical parameters of precipitation in different cloud systems is of great significance to the study of precipitation mechanism, weather modification, radar quantitative measurement of precipitation, and the selection of microphysical parameterization schemes in numerical prediction models. Aiming at the liquid precipitation process in Ji''nan city, Shandong Province in 2015, the microphysical parameters of precipitation in different cloud systems were studied based on the Micro Rain Radar(MRR) data. At 400 m altitude, the rainfall intensity samples of stratiform clouds ranged from 0.02 mm/h to 0.2 mm/h were large, but their contribution to the cumulative precipitation was relatively small.The number concentration of large particles in convective and mixed precipitation was higher. In the vertical profile, the particle diameter in stratiform precipitation was relatively concentrated, and average D0 was about 1 mmbelow 1400 m altitude. When the rainfall intensity of convective cloud was greater than 20 mm/h, the vertical airflow (including updraft and downdraft) had a great influence on particle diameter, and the data quality of precipitation parameters retrieved by MRR is poor,especially at upper range gates. Meanwhile, with the minimal?impact of vertical airflow on stratiform precipitation, MRR data can be used to analyze the vertical evolution of raindrop spectrum below bright band when stratiform precipitation occurs.

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历史
  • 收稿日期:2018-10-29
  • 最后修改日期:2019-04-22
  • 录用日期:2019-05-14
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