中国区域小时降水量融合产品的质量评估
投稿时间: 2011-09-13  最后修改时间: 2011-11-17  点此下载全文
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作者单位
沈艳 中国气象局 国家气象信息中心,北京 100081 
潘旸 中国气象局 国家气象信息中心,北京 100081 
宇婧婧 中国气象局 国家气象信息中心,北京 100081 
赵平 中国气象局 国家气象信息中心,北京 100081 
周自江 中国气象局 国家气象信息中心,北京 100081 
基金项目:国家重点基础研究发展计划(973 计划)项目(2010CB951602);公益性行业(气象)科研专项(GYHY(QX)201006042);国家科技支撑计划项目(2012BAC22B04)
中文摘要:基于全国自动站观测降水量和CMORPH(CPC MORPHing technique)卫星反演降水资料,采用PDF(probability density function)和OI(optimal interpolation)两步融合方法生成了中国区域1 h、0.1°×0.1°分辨率的降水量融合产品。本文分别从产品误差的时空分布特征、不同降水量级和不同累积时间下的产品质量、三种站网密度下的融合效果以及对强降水过程监测能力等方面对比评估了融合降水产品质量。结果表明,融合降水产品有效利用了地面观测和卫星反演降水各自的优势,在降水量值和空间分布上均更为合理;融合产品平均偏差和均方根误差均减小,随时间的变化幅度不大且区域性分布特征减弱;融合产品与融合前的卫星反演降水产品相比在中雨(1.0~2.5 mm/h)、中到大雨(1.0~8.0 mm/h)、暴雨及以上(≥8.0 mm/h)的相对误差分别为-1.675%、小于15.0%、30.0%左右,且随着累积时间的增加,产品质量进一步提高;该产品能准确抓住强降水过程,在定量监测强降水中具有优势。
中文关键词:降水量  融合降水产品  自动气象站  卫星反演降水产品
 
Quality assessment of hourly merged precipitation product over China
Abstract:Based on the hourly precipitation observed by automatic weather stations(AWS) in China and retrieved from CMORPH(CPC MORPHing technique) satellite data,the merged precipitation product at hourly/0.1°lat/0.1°lon temporal-spatial resolution in China is developed through the two-step merging algorithm of PDF(probability density function) and OI(optimal interpolation).In this paper,the quality of merged precipitation product is assessed from the points of temporal-spatial characteristics of error,accuracy at different precipitation rates and cumulative times,merging effect at three station network densities and monitoring capability of the heavy rainfall.Results indicate that:1)The merged precipitation product effectively uses the advantages of AWS observations and satellite product of CMORPH,so it is more reasonable both at the precipitation amount and spatial distribution;2)The regional mean bias and root-mean-square error of the merged precipitation product are decreased remarkably,and they have a little change with time;3)The relative bias of merged precipitation product is -1.675%,less than 15% and about 30% for the medium(1.0—2.5 mm/h),medium to large(1.0—8.0 mm/h) and heavy rainfall(≥8.0 mm/h),respectively,and the product quality is improved further with the cumulative time increases.The merged precipitation product can capture the precipitation process very well and have a definite advantage in the quantitatively rainfall monitoring.
keywords:precipitation  merged precipitation product  automatic meteorological stations  satellite-based precipitation
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