基于时域有限差分法的雪花粒子群多次散射研究  

Multiple Scattering of Snowflake Particles Based on Finite-Difference Time-Domain Method

作　　者：谢槟泽 王金虎[1,2,3] 蔡嘉晗 陈浩 王佳欣[1] 李晶 XIE Binze;WANG Jinhu;CAI Jiahan;CHEN Hao;WANG Jiaxin;LI Jing(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology,Nanjing 210044;National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education,Nanjing University of Information Science&Technology,Nanjing 210044;Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)

机构地区：[1]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,中国气象局气溶胶与云降水重点实验室,南京210044 [2]南京信息工程大学大气科学与环境气象国家级实验教学示范中心,南京210044 [3]中国科学院大气物理研究所中层大气与全球环境观测重点实验室,北京100029

出　　处：《气象科技》2020年第3期313-321,共9页Meteorological Science and Technology

基　　金：国家自然科学基金资助项目(41905026);江苏省自然科学基金资助项目(BK20170945);中国博士后科学基金第63批面上资助项目(2018M631554);大气科学与环境气象实验实习教材建设项目(SXJC2017B03,SXJC2018B03);江苏省级大学生实践创新训练计划项目(Z201710300008,201810300105T,201910300152E);中国气象局气溶胶与云降水重点开放实验室开放课题(KDW1703)资助。

摘　　要：为精确利用雷达回波反演雪花粒子的微物理参数,建立满足指数分布的非球形雪花粒子群模型,在94GHz频率下利用XFDTD软件计算电磁波不同入射方向下粒子群的后向散射截面,并与简单相加作比较,结果表明:同一入射方向下,粒子群多次散射效应下的后向散射截面均大于简单相加的结果;不同入射方向下,粒子群的后向散射截面表现出很大的差异。因此雷达实际探测中必须考虑多次散射和入射电磁波的方向。In order to accurately retrieve the microphysical parameters of snowflake particles using radar,the exponential distribution of non-spherical snow particle swarm is established and the back-scattering cross-sections of non-spherical snow particle swarm at six different incident directions are calculated at 94 GHz using the XFDTD software and then compared with the results of simple addition.For the same incident directions,all the back-scattering cross-section results of the particle swarm are larger than the result of simple addition.For the different incident directions,the back-scattering cross-section results of the particle swarm are different.These results show that the direction of multiple scattering and incident electromagnetic wave must be considered in the actual radar detection.

关 键 词：雪花粒子 时域有限差分方法 雷达散射截面 非球形 多次散射 

分 类 号：P406[天文地球—大气科学及气象学]