山西地区一次层状云降水过程的微观特征观测分析
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山西省青年科技研究基金项目(2011021034);中国气象局云雾物理环境重点开放实验室开放科研课题(2009002);中国气象局大气物理与大气环境重点开放实验室开放课题(KDW1102)


Observation and analysis of microphysical characteristics of stratiform cloud precipitation in Shanxi Province
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    摘要:

    针对山西省2010年5月27日一次层状云降水过程,利用机载DMT探头和Parsivel激光降水粒子谱仪进行探测试验,分析了云微物理特征,并对空中和地面雨滴谱进行比较。结果显示:空中云垂直和水平结构分布不均匀,CDP、CIP探测最大粒子浓度分别为165.20、1.08 cm-3。地面雨滴微物理量的平均值说明本次降水是典型的层状云降水,雨强主要由雨滴数密度决定,雨滴微物理参量随时间分布不均匀。建立地面雨强I与雷达反射率因子Z、雨水含量W、雨滴数浓度N、Gamma分布的谱参数N0λ的相关关系,Z-IW-I相关性很好,N-IN0-Iλ-I相关性较差。地面平均雨滴谱较空中平均雨滴谱窄、谱型陡。结合粒子图像和雨滴特征量分析空中雨滴谱随高度的分布发现,本次降水是冷云和暖云降水共存。

    Abstract:

    The cloud microphysical properties of a stratiform cloud in Shanxi on 27 May 2010 were analyzed based on the airbrone DMT probes and Parsivel laser precipitation particle spectrometer.The results showed that the vertical and horizontal structure of clouds was uneven.The maximum concentration values sampled by CDP and CIP were 165.20 cm-3 and 1.08 cm-3 respectively.Average value of microphysical features of surface raindrops indicated that it was a typical stratiform cloud precipitation.Rainfall intensity is mostly decided by raindrop concentration.Temporal distribution of raindrop microphysical parameters was not even.The correlations between the rainfall intensity(I) and the radar reflectivity(Z),the rainwater content(W),the raindrop concentration(N),parameter N0 and parameter λ were established.There was a very good correlation between I and Z and W,but N、parameter N0 and parameter λ were poorly correlated to I.The surface raindrop size distributions were narrower and steeper than the upper raindrop size distributions.The precipitation was the coexistence of cold cloud and warm cloud precipitation.

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封秋娟,李培仁,丁建芳,申东东,晋立军,2013.山西地区一次层状云降水过程的微观特征观测分析[J].大气科学学报,36(5):537-545. FENG Qiu-juan, LI Pei-ren, DING Jian-fang, SHEN Dong-dong, JIN Li-jun,2013. Observation and analysis of microphysical characteristics of stratiform cloud precipitation in Shanxi Province[J]. Trans Atmos Sci,36(5):537-545.

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  • 收稿日期:2012-02-23
  • 最后修改日期:2012-03-25
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