成都市年降水量时空分布特征  

Temporal and Spatial Distribution Characteristics of Annual Precipitation in Chengdu

作　　者：谢欢 杨笔锋[1] 张怡 XIE Huan;YANG Bifeng;ZHANG Yi(College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225

出　　处：《成都信息工程大学学报》2022年第3期356-360,共5页Journal of Chengdu University of Information Technology

基　　金：国家公益性行业(气象)科研专项资助项目(GYIIY201306074)。

摘　　要：为了解成都地区降水场在时间和空间上的变化特征,并对短时间内成都市降水的发展趋势进行预测,基于成都市内12个地面台站43 a逐小时降水量资料,采用二维插值方法对缺失的数据进行填补,利用经验正交函数分析方法,对成都市43 a以来降水场的时间、空间变化特征进行研究。结果表明:成都市降水场的时空分布具有两种典型模型,即总体一致性,西北、东南相反类型,累积贡献率为70.2%。模态一表征成都市降水量变化趋势具有一致性,1980年和1985年是近43 a成都市降水最多的年份,2009年是最少的年份。近43 a来模态一所对应的时间系数波动呈下降趋势,说明成都市的降水量呈减少的趋势。模态二在成都市西北地区为正,东南地区为负,且其对应的时间系数波动呈上升趋势,说明近43a来成都市西北地区降水量增加、东南地区降水量减少。2种典型模态所表征的成都市降水场有4种表现类型,即全年全市多雨的类型有12 a,全年全市少雨的类型有15 a,全市西北雨量多东南雨量少的类型有3 a,西北雨量少东南雨量多的类型有2 a。这与线性拟合的降水量变化趋势一致。In order to understand the temporal and spatial variation characteristics of the precipitation field in Chengdu,and to predict the development trend of precipitation in Chengdu in a short period of time.Based on the hourly precipitation data of 12 ground stations 43 a in Chengdu,two-dimensional interpofation is used to fill in the missing data,and use the empirical orthogonal function analysis method to analyze the characteristics of temporal and spatial change of precipitation field since 43 a in Chengdu.The results show that the temporal and spatial distribution of precipitation field in Chengdu has two typical models,namely overall consistency,opposite types in the northwest and southeast,with a cumulative contribution rate of 70.2%.Mode 1 indicates that the change trend of precipitation in Chengdu is consistent.1980 and 1985 are the year with the most precipitation in Chengdu in the past 43 years,and 2009 is the least.In the past 43 years,the fluctuation of the time coefficient corresponding to Mode 1 has shown a downward trend,which indicates that the precipitation in Chengdu has shown a decreasing trend.Mode 2 is positive in the northwest of Chengdu and negative in the southeast,and its corresponding time coefficient fluctuates in an upward trend,indicating that the precipitation in the northwest of Chengdu has increased in the past 43 years,and the precipitation in the southeast has decreased.The precipitation field in Chengdu represented by the two typical modalities has four manifestations:12 years of rainy throughout the city,15 years of drier rainfall throughout the city,3 years of rainfall in the northwest of the city while less rainfall in the southeast,and 2 years of less rainfall in the northwest while more rainfall in the southeast.This is consistent with the change trend of precipitation based on linear fitting.

关 键 词：大气探测 EOF 年降水量 时空分布 二维插值 成都 

分 类 号：P466[天文地球—大气科学及气象学]