一次对流云团过程结构特征的观测和模拟研究
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引用本文:张雨芳,刘卫国,周毓荃.一次对流云团过程结构特征的观测和模拟研究[J].气象与环境科学,2017,40(4):9-18.Zhang Yufang,Liu Weiguo,Zhou Yuquan.Numerical Simulation and Observation Research on the Structure Characteristics of One Convective Cloud Cluster Process[J].Meteorological and Environmental Sciences,2017,40(4):9-18.
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作者单位
张雨芳,刘卫国,周毓荃  
DOI:10.16765/j.cnki.1673-7148.2017.04.002
基金项目:
中文摘要:为了解2015年8月22日发生在北京东部的一次对流云团的生消演变过程及微物理特征,使用耦合了CAMS云微物理方案的WRF中尺度云分辨模式对此次过程进行数值模拟。由于研究的对流云团尺度较小,对时空分辨率要求较高,把LAPS(Local Analysis and Prediction System)局地分析和预报系统同化多源观测资料后输出的高分辨率的中尺度分析场作为模式的初始场。将模拟结果与FY-2F卫星、北京SA波段多普勒天气雷达、地面雨量站等观测资料进行对比分析。同时,研究了对流云团中的微物理含量分布,深入分析此次过程的降水机制。结果表明:模式能够较好地模拟出对流云团在生成、发展、成熟和消散的四个不同阶段的演变规律,整个对流云系的发展持续4 h左右,对北京有直接影响的对流单体的生命时长在1 h左右;模拟的自然云云带分布和演变规律、小尺度云团的尺度、位置、形状和垂直结构都与观测资料有较好的一致性;模式也能模拟出降水落区和量级及强中心的位置。此次对流云过程主要为冷暖混合云系结构,云中过冷水丰沛,降水机制以冷云降水为主,暖区供水云对降水的发展有促进作用,霰融化为雨滴是主要的成雨过程。
中文关键词:对流云团  云结构  云模式
 
Numerical Simulation and Observation Research on the Structure Characteristics of One Convective Cloud Cluster Process
Abstract:To research the evolution and microphysical characteristics of one convective cloud cluster process happened in Beijing at August 22nd, 2015, WRF cloud resolving model coupled with CAMS microphysical scheme is used to simulate this process. Because the scale of the convective cloud cluster is small, which asks for high resolution on time and space, the mesoscale analysis field with high resolution output from LAPS (Local Analysis and Prediction System) is used as initial field of the model. Simulation results is compared to observation data including FY-2F satellite, SA band Doppler weather radar of Beijing, precipitation data of ground station. At the same time, the microphysical parameters are studied to deeply analyze the precipitation mechanism of this process. The result shows that: the model can well simulate four different evolution stage including production, growth, mature and extinction of the convective cloud cluster process. Whole process maintains about 4 h, and the lifetime of the convective cell which directly influences Beijing stays about 1 h. The simulation of the distribution and evolution of cloud band, the scale, location , shape and vertical structure of the cloud cluster has a good agreement with observation data. The model has the ability to simulate precipitation magnitude and region as well as the location of the strong center. This convective cloud cluster is cold and warm mixed cloud structure and there is abundant supercooled water in the cloud. The precipitation mechanism of this process is a combination of cold cloud precipitation mechanism and the warm’s, in which the cold’s is the main mechanism, while the water supply in warm cloud has played an enhanced role in precipitation. Melting of the graupel is the main formation of precipitation.
Keywords:convective cloud cluster  cloud structure  cloud model
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