大气科学2017，Vol.41Issue(6)：1246-1263,18.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 a Thunderstorm Cell with X-Band Dual-Polarimetric Radar
摘要
Abstract
In order to understand the distribution and evolution of hydrometeors in thunderstorm cells,a fuzzy logic algorithm is applied to analyze the evolution characteristics of hydrometeors in a typical thunderstorm cell that occurred in Beijing by utilizing the dual-polarization radar parameters and environmental temperature.Furthermore,a wavelet de-noising method and a self-consistent method with constraints (SCWC) are combined to preprocess the data.The results are as follows.(1) According to the macroscopic characteristics of the thunderstorm cell,the process is divided into three stages,i.e.the development stage,the mature stage and the dissipation stage.The average heights of the cell are 11,12 and 10 km,and the reflectivity can reach 40-45 dBZ,greater than 50 dBZ and 40-45dBZ in the three stages,respectively.Moreover,the percentages of graupels are 2％,12％ and 1％ in the 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 freezing level 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 the freezing level,reacting with dry crystal (DC) and generating 1％ of graupels,which actually is a weak cold cloud process.During the mature stage,there is an enhanced warm-cloud process with DR decreasing by a percentage of 2 and RA increasing by a percentage of 2.More liquid hydrometeors can rise to the layer above the freezing level and there is an enhanced cold cloud process with 4％ of RA and 5％ of DC converting to 7％ of graupels.At the last stage,the liquid hydrometeors below 0℃ layer cannot rise to the layer above 0℃,which leads to weaker warm and cold cloud processes.DR increases by a percentage of 1 below the freezing level while DC increases by a percentage of 2,and graupels above the fieezing level reduces by a percentage of 5.(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 cells as well as improving the forecast of thunderstorm weather.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Key words
X-band dual-polarimetric radar/Fuzzy logic algorithm/Hydrometeors/Thunderstorm cell分类
天文与地球科学引用本文复制引用
李晓敏,周筠珺,肖辉,伍魏,翟丽..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,2017,41(6):1246-1263,18.基金项目
国家重点基础研究发展计划(973计划)项目2014CB441401,北京市自然科学基金重点项目8141002,四川省教育厅项目16CZ0021,国家科技支撑计划项目2015BAC03B00,成都信息工程大学气象科普基地示范项目2017KZ0015 National Basic Research Program of China (973 Program) (Grant 2014CB441401),Key Project of Beijing Natural Science Foundation (Grant 8141002),Sichuan Provincial Department of Education Project (Grant 16CZ0021),National Key Technology Research and Development Program of theMinistry of Science and Technology of China (Grant 2015BAC03B00),Demonstration Project of Meteorological Science Popularization Base of Chengdu Information Engineering University (Grant 2017KZ0015) （973计划）
