1961—2009年淮河流域昼夜降水变化特征  

Change characteristics of day and night precipitation in Huaihe River Basin in 1961-2009

作　　者：王胜[1] 谢五三[1] 唐为安[1] 陶寅[1] 丁霞[1] 

机构地区：[1]安徽省气候中心,合肥230031

出　　处：《生态学杂志》2011年第12期2881-2887,共7页Chinese Journal of Ecology

基　　金：中国气象局2009年气候变化专项(CCSF-09-10);2008年度淮河流域气象开放研究基金项目(HRM200805)资助

摘　　要：利用淮河流域162个台站1961—2009年逐时降水资料,采用线性倾向估计、REOF分析、功率谱、Mann-Kendall突变检验等方法,分析淮河流域昼夜降水基本特征及其时空演变规律。结果表明:淮河流域昼夜降水空间差异明显,总体呈北少南多分布,年夜雨量和夜雨日略多于昼雨量和昼雨日,且不同季节和不同强度等级降水昼夜差异显著;气候变化导致淮河流域昼夜降水量格局发生改变,年夜雨量大部地区有增多趋势,年昼雨量呈东部减少而西部增多的趋势。REOF分析表明,年昼夜降水量空间模态基本划分为流域东北部、中北部、西北部、东部、西部和南部等6个高载场区;流域年昼夜降水量均存在7～9a显著主周期振荡,此外年昼雨量还存在2a左右次周期变化。Mann-Kendall分析表明,年昼夜降水量均分别经历了一次减少和一次增多的突变,但未通过0.05的信度检验。Based on the 1961-2009 hourly precipitation data from 162 meteorological stations in Huaihe River Basin,this paper analyzed the basic characteristics and spatiotemporal patterns of day and night precipitation in the Basin by the methods of linear trend estimation,REOF analysis,power spectrum,and Mann-Kendall test.The annual day and night precipitation in the Basin varied greatly in different regions,being higher in the south while lower in the north.The annual precipitation and the precipitation days at nighttime were slightly more than those at daytime,but the day and night precipitation had significant difference in intensity in different seasons.Due to the climate change,the day and night precipitation patterns had obvious change.The annual nighttime precipitation presented an increasing trend in most regions,whereas the daytime precipitation decreased in the east while increased in the west of the Basin.The REOF analysis showed the spatial modes of the annual day and night precipitation could be divided into six anomaly regions,i.e.,northeast,north-central,northwest,east,west,and south.The annual day and night precipitation showed the same main oscillation period of about 7-9 years,and the second oscillation period of the daytime precipitation was about 2 years.The Mann-Kendall test indicated that the daytime precipitation experienced a mutation of decrease and the nighttime precipitation experienced a mutation of increase,but not passed the reliability test at 0.05.

关 键 词：昼夜降水 时空分布 变化趋势 淮河流域 

分 类 号：P468.024[天文地球—大气科学及气象学]