滕方达,李得勤. 2020. 微物理过程参数化方案对辽宁一次暴雪的数值模拟差异分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.045
微物理过程参数化方案对辽宁一次暴雪的数值模拟差异分析
Comparative Analysis on A Heavy Snow Event in Liaoning Province Using Different Cloud Microphysical Parameterization Schemes
投稿时间:2019-09-27  修订日期:2020-02-14
DOI:10.11676/qxxb2020.045
中文关键词:  云微物理  参数化方案  暴雪模拟  降水相态
英文关键词:Cloud Microphysics  Parameterization Scheme  Heavy Snow Simulation  Precipitation Phase
基金项目:
作者单位E-mail
滕方达 辽宁省气象台 tengfangda@163.com 
李得勤 辽宁省气象台 lewen05@hotmail.com 
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中文摘要:
      利用WRFV3.9.1中尺度数值模式,采用Lin、WSM6、Thompson、WDM6四种微物理过程参数化方案对2007年3月4日辽宁特大暴雪过程进行了数值模拟研究。使用61个国家站降水观测资料,评估了模式对此次过程降水的模拟能力,对比分析了不同微物理过程参数化方案对降雪过程中相态变化和水成物空间分布的差异。结果表明:四种微物理参数化方案均能模拟出与CloudSat卫星反演反射率分布相接近的结果,其中Thompson方案模拟的回波顶更高,向北伸展的范围也更大,其他三种方案回波顶高均在8km附近。四种方案对降水落区的模拟略有差异,整体来看WSM6方案对本次降水的极值中心位置,以及不同降水量级的TS评分整体都优于其他三种微物理参数化方案。降水相态模拟与观测的对比分析发现,WSM6、Lin和WDM6三种方案均能够模拟出雨雪分界线不断南压的过程且雨雪分界线位置准确,而Thompson方案对辽宁南部地区雨转雪时间模拟偏晚。从云微物理特征上看,四种方案均能模拟出大气低层存在的雨水粒子,其中WDM6方案模拟的雨水含量明显较其他三种方案更多,Thompson方案模拟出更多的雪粒子和最少的霰粒子,Lin方案霰粒子南北范围广、伸展高度高,WSM6和WDM6两种方案模拟出较少的霰粒子,这两种方案模拟的云冰高度也更低,正是各种水成物空间分布的差异决定了不同微物理过程参数化方案对降水量和降水相态模拟的差异。
英文摘要:
      A heavy snow event is simulated with four different microphysical parameterization schemes of WRFV3.9.1 model (Lin, WSM6, Thompson, WDM6) in Liaoning Province on March 4th 2007. The simulation capability of precipitation is evaluated based on 61 national observational stations. The precipitation phase and the spatial distribution of hydrometeors are compared between different cloud microphysical parameterization schemes during the precipitation process. The result shows that the reflectivity simulated with four schemes is the same with that observed by the CloudSat satellite, the echo simulated with the Thompson scheme is higher and extends north than the other three schemes, which are all around 8km. The precipitation area is slightly different between four schemes, the location of all these schemes are north than the observation. From the perspective of subjective test and objective score, the WSM6 scheme performs best according to the TS scores and the precipitation cell location. The southerly movement and the accurate location of rain and snow dividing line is simulated well with WSM6, Lin and WDM6 schemes, but the transition time of rain to snow is late with Thompson schemes. All of these schemes can simulate the rain at the low level, but the quantity of rain with WDM6 is more than the other three schemes. More snow and less graupel is discovered in the result of the Thompson schemes, and the graupel distributes higher and extend widely with the scheme of Lin. Both of WSM6 and WDM6 schemes simulate less graupel and lower height of the cloud ice. The different distribution of hydrometeors contributes to the precipitation and phase in different microphysics schemes.
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