摘要
利用吉林省业务运行的中尺度数值模式WRF3.3.1,分析了2016年4月12日吉林省一次春季降水过程的人工增雨潜力,选取比湿、上升气流、K指数、冰面过饱和度、云水厚度共5种与人工增雨潜力密切相关的指标,作为吉林省春季人工增雨潜力判别的因子。结果表明:吉林省春季850 hPa比湿和K指数与降水量存在相关关系,比湿小于2.9 g·kg^-1几乎不产生降水,产生2 mm以上的降水比湿几乎均大于4.5 g·kg^-1,K指数大于22℃。将850 h Pa比湿大于4.5 g·kg^-1、K指数大于22℃、积分云水含量大于0.2 mm、高层冰面过饱和度大于0和低层垂直速度大于0.4 m·s^-1作为强增雨潜力区的指标,并利用春季其他个例对该指标进行检验,发现该指标基本能够表征云内的动力、热力和微物理条件,可以作为人工增雨潜力区的判别指标。
By using the mesoscale numerical model WRF 3.3.1 applied in operational forecasting system in Jilin province,the potential of artificial precipitation enhancement(APE)of a spring rainfall process on April 12,2016,was analyzed.Specific humidity,updraft,index K,E-Ei and integral cloud water related to APE potential were chosen as comprehensive index identifying the APE potential area.The results indicated that 850 hPa specific humidity(SH850)and index K are relevant to the precipitation in spring in Jilin province.No precipitation occurs when SH850 is less than 2.9 g·kg^-1,while precipitation more than 2 mm mostly corresponds to SH850 more than 4.5 g·kg^-1 and index K more than 22℃.In addition,SH850 larger than 4.5 g·kg^-1,index K larger than 22℃,integral cloud water larger than 0.2 mm,E-Ei larger than 0 and vertical velocity of lower layers larger than 0.4 m·s^-1 were determined as the index of strong APE potential area.Then,the other spring precipitation events are used to test the grade recognition index,implying that the index is able to represent the dynamic,thermal and microphysical conditions of cloud and is available in identifying the potential area of APE in Jilin province.
作者
尚博
蔡淼
霍也
周毓荃
SHANG Bo;CAI Miao;HUO Ye;ZHOU Yu-quan(Changchun Meteorological Service,Changchun 130051,China;Chinese Academy of Meteorological Science,Bejing 100081,China)
出处
《气象与环境学报》
2020年第1期74-81,共8页
Journal of Meteorology and Environment
基金
国家重点研发专项(2016YFA0601701)
国家高新技术“863”课题(2012AA120909)
公益性(气象)行业科研专项(GYHY20120625)共同资助
关键词
增雨潜力
比湿
冰面过饱和度
增雨综合指标
Potential of artificial precipitation enhancement
Specific humidity
Ice supersaturation E-E_i
Index of artificial precipitation enhancement
