Decadal Variability of Extreme Precipitation Days over Northwest China from 1963 to 2012  

作　　者：郭品文 张夏琨 张书余 王春玲 张晓 

机构地区：[1]School of Atmospheric Sciences,Nanjing University of Information Science & Technology [2]Key Laboratories of Arid Climate Change and Disaster Reduction of Gansu Province,Lanzhou Institute of Arid Meteorology,China Meteorological Administration [3]School of Applied Meteorology,Nanjing University of Information Science & Technology [4]Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Journal of Meteorological Research》2014年第6期1099-1113,共15页气象学报（英文版）

基　　金：Supported by the China Meteorological Administration Special Public Welfare Research Fund(GYHY201006017);National Natural Science Foundation of China(41375121 and 41305079);Scientific Research and Innovation Plan for College Graduates of Jiangsu Province of China(CXZZ13_0500 and CXZZ13_0521)

摘　　要：Daily precipitation data from 153 meteorological stations over Northwest China during summer from 1963 to 2012 were selected to analyze the spatiotemporal distribution of extreme summer precipitation frequency.The results show that the extreme precipitation frequency was regional dependent.Southern Gansu,northern Qinghai,and southern Shaanxi provinces exhibited a high extreme precipitation frequency and were prone to abrupt changes in the frequency.Northwest China was further divided into three sub-regions（northern,central,and southern） based on cluster analysis of the 50-yr extreme precipitation frequency series for each meteorological station.The extreme precipitation frequency changes were manifested in the northern region during the late 1970 s and in the central region from the end of the 1980 s to the 1990 s.The southern region fluctuated on a timescale of quasi-10 yr.This study also explored the mechanism of changes in extreme precipitation frequency.The results demonstrate that stratification stability,atmospheric water vapor content,and upward motion all affected the changes in extreme precipitation frequency.Daily precipitation data from 153 meteorological stations over Northwest China during summer from 1963 to 2012 were selected to analyze the spatiotemporal distribution of extreme summer precipitation frequency.The results show that the extreme precipitation frequency was regional dependent.Southern Gansu,northern Qinghai,and southern Shaanxi provinces exhibited a high extreme precipitation frequency and were prone to abrupt changes in the frequency.Northwest China was further divided into three sub-regions（northern,central,and southern） based on cluster analysis of the 50-yr extreme precipitation frequency series for each meteorological station.The extreme precipitation frequency changes were manifested in the northern region during the late 1970 s and in the central region from the end of the 1980 s to the 1990 s.The southern region fluctuated on a timescale of quasi-10 yr.This study also explored the mechanism of changes in extreme precipitation frequency.The results demonstrate that stratification stability,atmospheric water vapor content,and upward motion all affected the changes in extreme precipitation frequency.

关 键 词：extreme precipitation frequency Northwest China stratification stability water vapor content atmospheric upward motion 

分 类 号：P468.024[天文地球—大气科学及气象学]