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风廓线雷达和雨滴谱仪资料在北京一次弱雨雪天气中的特征分析

翟亮1黄钰2李梓铭3陈云波2郭金兰1李靖1   

  1. 1.北京市气象台,北京100089;2.北京市人工影响天气办公室,北京100089;
    3.京津冀环境气象预报预警中心,北京100089
  • 出版日期:2019-02-28 发布日期:2019-02-28
  • 基金资助:

    国家自然科学青年基金(41805112)、北京市自然科学基金青年基金(8174067)、中国气象局预报员专项(CMAYBY2018-002)和北京市气象局科技项目(BMBKJ201701008)共同资助

Characteristic Analysis of Boundary Layer Wind Profiler Radar and Raindrop Spectrometer Data During a Weather Event from Rain to Snow in Beijing

ZHAI Liang1, HUANG Yu2, LI Ziming3, CHEN Yunbo2,GUO Jinlan1, LI Jing1   

  1. 1. Beijing Municipal Weather Forecast Center, Beijing 100089, China;
    2. Beijing Municipal Weather Modification Office, Beijing 100089, China;
    3. Beijing-Tianjin-Hebei Prediction and Early Warning Center for Environmental Meteorology, Beijing 100081, China
  • Online:2019-02-28 Published:2019-02-28

摘要:

利用北京市海淀区风廓线雷达、OTT Parsivel 2多功能激光雨滴谱仪和自动气象站观测资料,对2016年11月20日北京一次雨雪天气过程的演变特征进行了初步分析。结果表明:(1)风廓线(低模式)雷达反射率因子与雨滴谱仪反射率因子序列的变化趋势一致。当风廓线雷达反射率因子亮带消失后,雨滴谱反射率因子序列出现先降后升的小幅波动,降水相态转为降雪。(2)降水相态发生雨雪转换时,风廓线雷达谱宽600 m高度分散的大值区减弱并随高度降低后,雨滴谱仪数浓度出现先降后升的小幅度波动。(3)本次弱降水相态转换发生时,风廓线雷达所探测的垂直径向速度变化不明显,而雨滴谱仪降雨强度变化却有明显减弱特征,其雨强由5 mm·h-1下降至1 mm·h-1左右,这对临近降水相态变化的监测预报有一定指示意义。

关键词: 风廓线, 雨滴谱, 雨雪转换

Abstract:

Based on the data of wind profile radar, OTT Parsivel 2 multi-function laser raindrop spectrometer and automatic weather station observation of Haidian District, Beijing, the evolution characteristics of a weather event from rain to snow in Beijing on November 20, 2016 were analyzed. The results are as follows: (1) The reflectivity factor trend detected by the wind profile (low mode) radar and raindrop spectrometer was consistent. When the bright band of the wind profile radar reflectivity factor disappeared, the raindrop spectral reflectivity factor had a small fluctuation, and the precipitation phase changed from rain to snow. (2) When the precipitation phase transition occurred, the large value of the wind profile radar spectrum width on 600 m weakened, the number concentration of the raindrop spectrometer showed a small fluctuation with the first dropping and then rise. (3) When the phase transition of this weak precipitation occurred, the vertical velocity characteristics detected by the wind profiler radar were not obvious. However, the rainfall intensity of the raindrop spectrum instrument weakened obviously, and it decreased from 5 mm·h-1 to about 1 mm·h-1, this had certain guiding significance for the monitoring and forecasting of precipitation phase changes in the nowcasting.

Key words: wind profile, raindrop spectrum, rain

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