doi:  10.3878/j.issn.1006-9895.1705.16268
基于X波段双偏振雷达对雷暴单体中水成物粒子演变特征的研究

Research on the Evolution Characteristics of Hydrometeors in Thunderstorm Cell with X-band Dual-polarimetric Radar
摘要点击 366  全文点击 43  投稿时间:2016-11-24  最后修改时间:2017-02-03
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基金:  国家重点基础研究规划项目;北京市自然科学基金重点项目;四川省教育厅项目;国家科技支撑计划
中文关键词:  X波段双线偏振天气雷达  模糊逻辑算法  水成物粒子  雷暴单体
英文关键词:  X-band dual-polarimetric radar  Fuzzy logic algorithm  Hydrometeors  Thunderstorm cell
              
作者中文名作者英文名单位
李晓敏Li Xiaomin成都信息工程大学大气科学学院高原大气与环境四川省重点实验室;南京信息工程大学气象灾害预报预警与评估协同创新中心
周筠珺ZhouYunjun成都信息工程大学大气科学学院高原大气与环境四川省重点实验室
肖辉肖辉中国科学院大气物理研究所云降水物理与强风暴重点实验室
伍魏伍魏成都信息工程大学大气科学学院高原大气与环境四川省重点实验室
翟丽翟丽成都信息工程大学大气科学学院高原大气与环境四川省重点实验室
引用:李晓敏,周筠珺,肖辉,伍魏,翟丽.2018.基于X波段双偏振雷达对雷暴单体中水成物粒子演变特征的研究[J].大气科学
Citation:Li Xiaomin,ZhouYunjun,肖辉,伍魏,翟丽.2018.Research on the Evolution Characteristics of Hydrometeors in Thunderstorm Cell with X-band Dual-polarimetric Radar[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      为了解雷暴单体内部水成物粒子分布结构及演变过程,综合X波段双线偏振天气雷达的参量及环境温度参数,结合小波去噪和自适应约束算法进行资料预处理后,基于模糊逻辑算法对北京一个结构演变相对完整的典型雷暴单体内水成物粒子分布随时间演变特征进行系统的分析,得到如下结果:(1)按雷暴单体的宏观特征将其演变过程分为发展、成熟和消散阶段。三个阶段中单体平均高度分别为11、12、10km;回波强度最大可达40dBZ~45dBZ、大于50dBZ和40dBZ~45dBZ;霰粒子占各自阶段单体内所有粒子百分比分别为2%、12%和1%。(2)各阶段主要微物理过程及演变特征是:发展阶段,单体0℃层以下由暖云过程主导,毛毛雨占5%,雨滴占24%;少量液态粒子上升至0℃层以上与冰晶反应生成1%干霰,冷云过程较弱。成熟阶段,相较发展阶段0℃层以下毛毛雨减少约2%,雨滴增多约2%,粒子碰并加强,暖云过程增强;较多液态粒子上升至0℃层以上,约有4%的雨滴与5%的冰晶通过凇附作用生成7%的霰,冷云过程增强。消散阶段,下层液态粒子难以上升至0℃层以上形成初始冰晶,使暖云及冷云过程都减弱,0℃层以下毛毛雨相较成熟阶段平均增多约1%,粒子碰并减弱;0℃层以上冰晶消耗减少2%,霰生成减少5%。(3)基于雷暴单体内各类水成物粒子分布、演变及其动力场背景特征建立了雷暴单体演变过程微物理模型。本文研究有助于加深对典型雷暴单体内部水成物粒子分布和微物理过程的认识,可以为雷暴天气的预警和预报提供必要的指导。
Abstract:
      In order to understand the distribution and evolution of hydrometeors in thunderstorm cell, a fuzzy logic algorithm is described to analyze the evolution characteristics of hydrometeors in a typical thunderstorm cell over Beijing by utilizing the dual-polarization radar parameters and environmental temperature. Furthermore, wavelet de-noising and self-consistent method with constraints (SCWC) are combined in the data’s pre-process. The results are as follows. (1) According to the macroscopic characteristics of thunderstorm cell, the process is divided into three stages which are development, maturation and dissipation. The average height of cell is 11, 12 and 10km and the reflectivity factor can reach 40 ~ 45dBZ, more than 50dBZ and 40~ 45dBZ in three stages. Moreover, the percentages of graupel are 2%, 12% and 1% in three stages. (2) The main microphysical processes and evolving characteristics in each stage are as follows. In the development stage, the main microphysical process below the 0 ℃ layer is warm-cloud process with 5% of drizzle(DR) and 24% of rain(RA). A small amount of liquid hydrometeors rises to the layer above 0℃ reacting with dry crystal(DC) and generates 1% of graupel which indicates a weak cold cloud process. During the mature stage, there is an enhanced warm-cloud process with DR decreased by 2% and RA increased by 2%. More liquid hydrometeors can rise to the layer above 0℃ and there’s an enhanced cold cloud process with 4% of RA and 5% of DC converting to 7% of graupel. At last stage, the liquid hydrometeors below 0℃ layer can’t rise to the layer above 0℃ which lead to the weaker warm and cold cloud process. DR increased by 1% below 0℃ layer while DC increased by 2% with 5% reduction of graupel above 0℃ layer. (3) Based on the above results and dynamic characteristic, a microphysical model of the thunderstorm cell’s evolution process is established. This study is important for understanding the structure and microphysical processes of thunderstorm cell as well as improving the forecasting of thunderstorm weather.
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