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气象:2019,45(11):1579-1588
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基于Himawari-8卫星的云参数和降水关系研究
桂海林,诸葛小勇,韦晓澄,刘伯骏,唐志军,江琪
(国家气象中心,北京 100081; 南京大学,南京 210023; 重庆市气象台,重庆 401147; 91876部队气象台,山海关 066203)
Study on the Relationship Between Himawari-8-Based Cloud Parameters and Precipitation
GUI Hailin,ZHUGE Xiaoyong,WEI Xiaocheng,LIU Bojun,TANG Zhijun,JIANG Qi
(National Meteorological Centre, Beijing 100081; Nanjing University, Nanjing 210023; Chongqing Meteorological Observatory, Chongqing 401147; 91876 Army Meteorological Observatory, Shanhaiguan 066203)
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投稿时间:2019-01-19    修订日期:2019-10-10
中文摘要: 基于日本Himawari-8卫星的云产品,对中国中东部地区2017年夏季(6—8月)每日08—17时的降水资料进行了分析,重点讨论了云光学厚度(COD)、云顶粒子平均尺度(CPS)、云顶温度(CTT)三个云参数与降水的关系。试验表明,降水概率与云参数相关性较高,存在随着COD增加、CPS增加、CTT减小而增加的明显趋势。但是,单个云参数与降水强度相关性则较低;COD、CPS、CTT与小时降雨率的相关系数分别为0.2315、0.1823、-0.2235,均为弱相关。如果综合考虑联合两个或三个云参数形成小时降雨率分布矩阵,则降水过程能得到更为清晰的体现。2017年8月28日的个例表明,相比纯粹基于红外的算法,三参数方法可以明显提高小时降雨率的估计精度。
Abstract:Based on the cloud products from Japanese Himawari-8 satellite, this paper analyses the precipitation data form 08:00 BT to 17:00 BT in summer (June-August) of 2017 over central and eastern China. The relationships between cloud optical depth (COD), cloud-top particle size (CPS), cloud-top temperature (CTT) and precipitation were discussed in detail. Experiments showed that the rainfall probability is highly correlated to cloud parameters. The rainfall probability increases as the COD and CPS increase, and/or CTT decreases. However, the correlation between single cloud parameters and precipita-tion intensity is not high. The correlation coefficient between COD and hourly rain rate is 0.2315, that between CPS and hourly rain rate is 0.1823, and that between CTT and hourly rain rate is -0.2235, which are all weak correlations. If two or three cloud parameters are combined to form an hourly rain rate distribution matrix, the precipitation process can be more clearly reflected. The case on 28 August 2017 indicates that, compared to the pure infrared-based algorithm, the tri-parameter method can significantly improve the estimation accuracy of hourly rain rate.
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基金项目:重庆市气象局开放式研究基金项目(KFJJ-201701)、国家自然科学基金项目(41275030)、国家科技支撑计划(2015BAC03B07)和中国气象局预报员专项(CMAYBY2019-136)共同资助。
引用文本:
桂海林,诸葛小勇,韦晓澄,刘伯骏,唐志军,江琪,2019.基于Himawari-8卫星的云参数和降水关系研究[J].气象,45(11):1579-1588.
GUI Hailin,ZHUGE Xiaoyong,WEI Xiaocheng,LIU Bojun,TANG Zhijun,JIANG Qi,2019.Study on the Relationship Between Himawari-8-Based Cloud Parameters and Precipitation[J].Meteor Mon,45(11):1579-1588.