辽宁省5—9月降水日变化特征  

Diurnal variation patterns of precipitation in Liaoning Province from May to September

作　　者：张运福[1] 严晓瑜[2] 赵春雨[1] 王颖[1] 

机构地区：[1]沈阳区域气候中心,沈阳110016 [2]宁夏气象服务中心,银川750002

出　　处：《生态学杂志》2011年第7期1529-1534,共6页Chinese Journal of Ecology

基　　金：中国气象局2010年气候变化专项(CCSF2010-3);中国气象局气象新技术推广项目(CMATG2010M10);林业公益性行业科研专项(200804001)资助

摘　　要：基于1994—2008年逐年5—9月辽宁省52个气象台站的逐时降水数据,应用逐时降水量、逐时降水频次、逐时降水强度和不同持续时间降水4个指标对辽宁省降水日变化特征进行了研究。结果表明:辽宁省5—9月降水量和降水频次都呈现双峰型的日变化特征,峰值区为14:00—17:00和2:00—8:00;降水强度日变化呈现单峰型,峰值区位于14:00—17:00;各时次降水量与降水强度平均相关系数为0.8,与降水频次相关系数为0.5,降水量变化与降水强度关系密切,受降水频次影响较小;短时降水降水量和频次对总降水量和总降水次数的贡献较长持续时间降水的大,且短时降水多发于14:00—19:00,长持续时间降水主要出现于2:00—9:00。Based on the hourly precipitation data in May-September 1994-2008 from 52 meteorological stations in Liaoning Province,and by using four precipitation indices（hourly precipitation,hourly precipitation frequency,hourly precipitation intensity,and different duration precipitation）,this paper analyzed the diurnal variation characteristics of precipitation in the Province from May to September.Both the precipitation and the precipitation frequency in the Province in May-September presented a diurnal pattern of bimodal distribution,with the peak periods at 14：00-17：00 and 2：00-8：00,and the precipitation intensity presented unimodal pattern,with the peak period at 14：00-17：00.The average correlation coefficient of precipitation and precipitation intensity was 0.8,while that of precipitation and precipitation frequency was 0.5,suggesting that the precipitation was closely related to precipitation intensity,and less affected by precipitation frequency.The precipitation and precipitation frequency of short-time precipitation events had greater contribution to the total precipitation and total precipitation frequency,compared with those of long-duration precipitation events,and the short-time precipitation events mainly took place at 14：00-19：00,while the long-duration precipitation events mainly appeared at 2：00-9：00.

关 键 词：逐时降水量 逐时降水频次 逐时降水强度 不同持续时间降水 日变化 

分 类 号：P426.613[天文地球—大气科学及气象学]