C波段雷达反射率因子在CMA-GD模式中的应用  

APPLICATION OF C-BAND RADAR REFLECTIVITY IN CMA-GD MODEL

作　　者：符睿[1] 张诚忠[2] 张万诚[1] 陈浩伟 陈新梅[1] 韩慎友 周建琴[5] FU Rui;ZHANG Chengzhong;ZHANG Wancheng;CHEN Haowei;CHEN Xinmei;HAN Shenyou;ZHOU Jianqin(Yunnan Institute of Meteorological Sciences,Kunming 650034,China;Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Province Key Laboratory of Reginal Numerical Weather Prediction,CMA,Guangzhou 510641,China;Shaoguan Meteorological Bureau,Shaoguan,Guangdong 512028,China;Meteorological Observatory of Guangxi Zhuang Autonomous Region,Nanning 530022,China;Yunnan Climate Centre,Kunming 650034,China)

机构地区：[1]云南省气象科学研究所,云南昆明650034 [2]中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室,广东广州510641 [3]韶关市气象局,广东韶关512028 [4]广西壮族自治区气象台,广西南宁530022 [5]云南省气候中心,云南昆明650034

出　　处：《热带气象学报》2022年第5期631-640,共10页Journal of Tropical Meteorology

基　　金：2019年中国气象局省级科技创新发展专项(sscx201919);云南省气象局业务能力研究与提升专项(TQ201707);云南省气象局科技项目(YZ202203);国家自然科学基金(42075013、42165004);第二次青藏高原综合科学考察研究项目(2019QZKK0105);云南省重点研发计划-社会发展专项(202203AC100005);中国气象局创新专项(CXFZ2021Z034)共同资助

摘　　要：使用CMA-GD模式及云分析系统,引入云南C波段多普勒雷达反射率因子资料,对2019年7月9日过程进行模拟试验,分析引入反射率资料对模式初始场和降水过程预报的影响。(1)引入反射率后,云中和底部的云量有所增加。水汽在900~200 hPa有大范围增加,能有效地调整降水区域的水汽分布。对模式顶层温度的调整较大,而对风场的影响较小。(2)引入反射率后,对3 h内降水强度及落区有较大改善,4~6 h的预报有所改善,7 h以后改善不明显。(3)引入反射率资料后,1~4 h大气可降水量增量较明显,5~9 h增量较前4 h明显减小。(4)在河口上空云水和水汽在950~400 hPa增加,霰、云冰和云雪在600~400 hPa增加,雨滴在1000~500 hPa增加。水凝物增加,有利于河口站降水的发生。Based on the CMA-GD model and Cloud Analysis System,the present study introduced the Cband Doppler radar reflectivity data to simulate the precipitation event occurred on July 9,2019 in Yunnan,and analyzed the impact of the introduction of radar reflectivity data on the improvement of the initial field of the model and the forecast of this heavy precipitation process.The results showed that:(1)The introduction of radar reflectivity increased the number of clouds within and at the bottom of the cloud.Water vapor had a wide range of increase at the 900~200 hPa layer,and this could lead to effective adjustment of water vapor distribution in the precipitation zone.Moreover,it caused a large adjustment to the temperature of the model top but a small change to the wind field.(2)The introduction of radar reflectivity significantly improved the forecast of precipitation intensity and precipitation zone over a 3 h period.There was an improvement in the 4~6 h forecast,with no significant improvement in forecasts for longer period of time.(3)According to the model forecast of hourly atmospheric precipitable water,the introduction of reflectivity data brought more obvious increment of atmospheric precipitable water in the first 1~4 h,and significantly decreased increment in 5~9 h compared with the first 4 h.(4)At Hekou,the cloud water and water vapor increase at the 950~400 hPa layer,graupel,cloud ice and cloud snow increase at the 600~400 hPa layer and raindrop increase at the 1000~500 hPa layer increased after the introduction of reflectivity.The increase of water condensate is conducive to the occurrence of precipitation at Hekou station.

关 键 词：CMA-GD模式 C波段雷达 反射率 

分 类 号：P412.25[天文地球—大气科学及气象学]