宁夏降水集中度和降水集中期的时空变化特征分析  

Spatiotemporal Variation Analysis of Precipitation Concentration Degree and Precipitation Concentrated Periods in Ningxia

作　　者：李承璐 李超超 彭文发 徐磊 LI Chenglu;LI Chaochao;PENG Wenfa;XU Lei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《宁夏工程技术》2023年第4期295-301,共7页Ningxia Engineering Technology

基　　金：宁夏高等学校一流学科建设项目(NXYLXK2021A03);宁夏回族自治区重点研发计划重点项目(2020BEG03045,2022ZDYF1132);宁夏青年科技人才托举工程项目(TJGC2019041)。

摘　　要：基于1971—2020年宁夏12个气象站点的逐日降水数据,采用克里金空间插值法、经验正交函数(EOF)分解法及线性趋势法等方法分析了降水集中度(PCD)和降水集中期(PCP)的时空变化特征。结果表明:在空间分布上,PCD值由北向南逐渐减小,PCP则由北向南有提前的趋势,但变化不大;PCD和PCP在宁夏全区范围内的主要变化趋势一致,但存在北部和中南部变化趋势不一致的情况,北部的变化程度要大于中南部;在时间分布上,50 a来PCD没有明显的变化趋势,PCP则略有推迟趋势。Based on daily precipitation data from 12 meteorological stations in Ningxia from 1971 to 2020,this study employed Kriging spatial interpolation,Empirical Orthogonal Function(EOF)decomposition,and linear trend analysis to examine the spatiotemporal characteristics of Precipitation Concentration Degree(PCD)and Precipitation Concentration Period(PCP).The findings indicate that spatially,PCD values decrease progressively from north to south,and there is a slight trend for PCP to commence earlier in the south,although the changes are minimal.The overall trends of PCD and PCP across the Ningxia region are consistent;however,discrepancies exist between the northern and central-southern parts,with more pronounced changes in the north.Temporally,over the past five decades,PCD has shown no significant trend,whereas PCP has experienced a slight delay.

关 键 词：宁夏 降水集中度 降水集中期 时空变化 

分 类 号：P426.62[天文地球—大气科学及气象学]