白静漪,管兆勇.华东地区夏季不同等级降水变化特征分析.气象科学,,(): BAI Jingyi,GUAN Zhaoyong.Climatic characteristics of summer graded precipitation over East China.Journal of the Meteorological Sciences,,():
华东地区夏季不同等级降水变化特征分析
Climatic characteristics of summer graded precipitation over East China
投稿时间:2013-01-24  修订日期:2013-02-25
DOI:10.3969/2013jms.0010
中文关键词:  不同等级降水  降水频率  夏季
英文关键词:Graded precipitation  Precipitation frequency  Summer
基金项目:国家重点基础研究发展计划(973计划)项目(2011CB403406);国家科技支撑计划项目(2007BAC29B02);江苏高校优势学科建设工程资助项目(PAPD)
作者单位E-mail
白静漪 南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044
南京信息工程大学 大气科学学院, 南京 210044 
 
管兆勇 南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044
南京信息工程大学 大气科学学院, 南京 210044 
guanzy@nuist.edu.cn 
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中文摘要:
      采用华东地区78个气象站点逐日降水资料,根据日降水量的5个等级划分,应用线性趋势分析、相关分析等分析了不同等级降水频率和降水量的空间分布及其变化趋势。结果表明:(1)夏季不同等级降水频率在整个华东地区具有明显的地区差异,区域平均的降水频率由大到小依次为小雨、微量降水、中雨、大雨、暴雨。(2)平均的夏季总降水量呈南多北少的分布,各等级降水对总降水量的贡献率由大到小依次为暴雨、大雨、中雨、小雨,暴雨对夏季总降水量的贡献在某些年份可达50%以上。(3)区域平均的夏季降水日数呈下降趋势,但总降水量却有明显的增大趋势。(4)区域平均的某等级降水频率正异常时,华东地区各地该等级降水频率,亦多表现为正异常,尤其中雨以上等级降水频率异常符号在整个华东地区更为一致。(5)华东区域微量降水和小雨分别与其他等级降水存在显著的反相关关系,而中雨、大雨、暴雨三者发生频率之间无显著相关。
英文摘要:
      Using the daily precipitation data from 78 meteorological stations over East China, the spatial distribution and temporal change of the rainfall frequency and total amount have been analyzed under 5 different grades divided as per rainfall daily amount with linear trend and correlation analysis. Our results show that summer daily rainfall frequency at different grades has spatial differences over East China. Areal average frequencies of event occurrence in an apparent descending order are light rain, micro rain, moderate rain, heavy rain, and torrential rain. The mean climatology of summer total rainfall presents larger rainfall amount in the south than that in the north. Impressively,the contribution of precipitation at different grades is converse to the total precipitation. Contribution of torrential rain in total rainfall is almost up to 50% in some years. Regional mean occurrence, frequency of occurrence, and amount of summer rainfall change yearly with a significant long-term trend, which is summertime rainy-day is decreasing while the regional mean total precipitation is increasing during the studying period. When regional mean precipitation frequency anomaly at a certain grade is positive, the composite precipitation frequency at this grade tends to be positive all over East China, especially for the rainfall heavier than moderate rain. Significant negative correlations are found between micro rain (light rain) and other precipitation grades over East China. However,no significant relationship exists among moderate rain, heavy rain and torrential rain.
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