1901-2016年天津地区降水的多尺度特征  

Characteristics of Multiple Scales of Precipitation from 1901 to 2016 in the Region of Tianjin

作　　者：王敏 任建玲 易笑园[2] 徐梅[1] 年飞翔 勾志竟 李文博 WANG Min;REN Jianling;YI Xiaoyuan;XU Mei;NIAN Feixiang;GOU Zhijing;LI Wenbo(Tianjin Meteorological Information Center,Tianjin 300074,China;Tianjin Meteorological Observatory,Tianjin 300074,China;Tianjin Meteorological Observation Center,Tianjin 300074,China)

机构地区：[1]天津市气象信息中心,天津300074 [2]天津市气象台,天津300074 [3]天津市气象探测中心,天津300074

出　　处：《水土保持研究》2020年第5期154-159,共6页Research of Soil and Water Conservation

基　　金：国家自然科学基金(41575049);国家自然科学基金青年基金(41905132);国家自然科学基金(41575063);淮河流域气象开放研究基金暨安徽省大气科学与卫星遥感重点实验室开放基金(HRM201701)。

摘　　要：基于1901—2016年天津地区降水观测数据及全球降水气候中心(Global Precipitation Climatology Centre,GPCC)、英国英吉利大学(Climate Rearsch Unit,CRU)研制的两套格点化月降水数据,利用taylor统计、时间变率、Ensemble Empirical Mode Decomposition(EEMD)等多种方法,分析了不同降水资料在天津的适用性,进而分析天津地区百年降水的多时间尺度、空间分布特征。结果表明:(1)1901—2016年GPCC比CRU降水数据更适用于天津地区。(2)天津地区1901—2016年降水的空间分布表现为"北多南少,东多西少"的趋势,时间变率呈"南正北负"的分布特征,其线性趋势较弱。(3)从天津降水距平百分率来看,其北部低于南部。(4)从多尺度变化来看,天津地区降水距平百分率南北部的年际变化较为相似,年代际变化存在差异性;趋势项表明天津南、北部的降水距平百分率均表现为先增强后减弱的趋势,但北部的增幅弱于天津南部。Based on the reanalysis datasets and observed dataset of in Tianjin in the period 1901—2016,we used the integrated approaches that combine Taylor statistic,time variability,EEMD,to analysis the spatial-temporal characteristics of precipitation.The main conclusions are as follows.(1)Compared with CRU data,GPCC data had more applicability in Tianjin region.(2)The annual precipitation decreased from south to north as well as from east to west in spatial distribution,the distribution of time variability in the north of Tianjin was negative,and was positive in the south of Tianjin.(3)The percentage of precipitation anomaly revealed that the drought frequency was lower in the north region than south region of Tianjin.(4)With respect to the variations of various scales in terms of the percentage of precipitation anomaly,it revealed that the annual variability was similar while the decadal time scales cycle was different;there was increasing tendency from 1901 s to 1950 s,then the decreasing tendency after 1960 s in the north region of Tianjin,while the increasing tendency in the south region ended up until 1970.

关 键 词：长时间降水序列 GPCC数据 CRU数据 EEMD 时空特征 

分 类 号：P426.61[天文地球—大气科学及气象学]