双月刊

ISSN 1006-9895

CN 11-1768/O4

基于多源资料的积层混合云降水微物理特征
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山东省人民政府人工影响天气办公室

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省自然科学基金,国家自然科学基金,其它


Microphysical characteristics of a stratiform precipitation with embedded convection based on multi-source data
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Weather Modification Office of Shandong Province

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    摘要:

    基于地基云雷达、地基微雨雷达和天气雷达等遥测设备观测资料,结合挂载KPR云雷达和DMT粒子测量系统的飞机平台,详细分析了山东积层混合云降水过程的云降水微物理结构特征。结果表明,积层混合云降水过程呈现层状云和对流云降水特征。零度层以上,5~6km高度层内,对流云降水多普勒速度和谱宽均大于层状云,说明对流云降水环境垂直气流、粒子尺度等均大于层状云。对流云降水,云雷达和微雨雷达时空剖面上出现由衰减造成的“V”字形缺口,云雷达衰减程度大于微雨雷达,且随高度增加,衰减越大。层状云降水,零度层亮带附近,雷达反射率因子跃增高度比多普勒速度高80 m,多普勒速度跃增高度又比谱宽高20 m。降水云系零度层附近降水机制复杂,粒子形态有辐枝冰晶聚合物、针状冰晶聚合物和云滴;零度层以上,5~6km处,对流云降水的多普勒速度和谱宽均大于层状云降水,即对流云降水环境垂直气流、粒子尺度范围等均大于层状云降水。

    Abstract:

    Based on ground-based micro-rain radar and cloud radar, combined with aircraft observation, a stratiform precipitation with embedded convection is analyzed to study the cloud-precipitation microphysical structure accurately. The results show that: 1) The selected precipitation process is divided into stratified cloud and convective cloud. Above zero layer, especially on the height of 5~6 km, doppler velocity and spectrum width of convective precipitation are greater than that of the stratiform cloud precipitation, which indicates that vertical wind of environment, the size range of the particle occurred in convective precipitation are greater than the stratiform precipitation. 2) At the period of convective precipitation, there is a V-shaped gap caused by attenuation in radar reflectivity of cloud radar and micro rain radar in time and height profiles. The attenuation of cloud radar is grater than that of micro rain radar, the higher the height, the greater the attenuation. 3) At the period of stratiform precipitation, near the bright band,the?leap?increase height of radar reflectivity factor is 80m higher than the Doppler velocity, and the leap?increase height of Doppler velocity is 20m higher than the spectral width. 4) The precipitation mechanism near the zero degree layer of is complex. When the negative temperature is close to 0℃, the particle shape includes aggregated dendritic ice crystals, needle ice crystals and cloud droplets. The Doppler velocity and spectral width of convective cloud precipitation are greater than that of stratiform precipitation above the zero degree layer, especially at the altitude of 5 and 6km. The vertical airflow and the scale range of small and large particles in convective precipitation are greater than that of stratiform cloud precipitation.

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  • 收稿日期:2021-03-12
  • 最后修改日期:2021-07-01
  • 录用日期:2021-09-06
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