零度层亮带的成因理论模拟与分析研究

项目名称： 零度层亮带的成因理论模拟与分析研究

项目编号： No.41275043

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 王振会

作者单位： 南京信息工程大学

项目金额： 80万元

中文摘要： 零度层亮带，在天气雷达观测中已成为降水性质识别的重要依据，也是冻雨识别的主要判据和雷暴云消散的重要标志，而且零度层亮带会引起雷达对降水量和VIL的过高估计。零度层亮带内部含有多相态、非球形粒子群，但因其散射特征计算复杂而一直难以在零度层亮带成因研究中全面定量计算。因此，零度层亮带的成因理论模拟与分析研究具有重要的理论意义和应用价值。本课题以课题组已结题NSFC项目开发的雷达探测及其数据处理仿真软件SimRAD为平台，把课题组多年来对非球形、非均质粒子散射特征和双线偏振多普勒天气雷达探测的研究成果，创新性地应用于零度层亮带形成的云微物理学因素模拟计算分析，并与双线偏振多普勒天气雷达资料及探空资料等实际探测资料相结合，检验模拟效果，探讨参数设置对模拟计算的影响，分析零度层亮带的形成机制、影响因素和特征，为利用雷达监测降水和VIL、识别冻雨、研究雷暴云消散过程中的微物理特征等提供理论依据和方法。

中文关键词： 零度层亮带；多相态；非球形粒子；理论模拟；雨滴谱反演

英文摘要： Radar bright band has become an important basis for the identification of precipitation nature when weather radar detects precipitation .It is not only one of the main criteria in distinguishing freezing rain,but also an important symbol to the dissipation of a thunderstorm.And the band may lead to overestimation of precipitation and VIL. But comprehensive and quantitative research on radar bright band to take into account the multiphase non-spherical particles has long been obstructed because the calculation of the multiphase non-spherical particle's scattering characteristics has been too complicated to be realized. Therefore, it is of great significance in further research on radar bright band. The proposal is raised up for this, based on our achivements including a software called SimRAD( simulating radar detection and data processing) resulted from our last NSFC project，to create a comparitively thorough, simulative, microphysical study on the formation of a radar bright band. That is, non-spherical and inhomogeneous particle's scattering characteristics will be taken into account in the calculation and analysis of the cloud microphysical factors of the formation of radar bright band. The results obtained from simulation will be compared with the actual detections with dual-polarization Doppler radar and r

英文关键词： Radar bright band；Multiphase；Non-spherical particles；Theoretical simulation；inversion of raindrop size distribution