Development of a Global Historic Monthly Mean Precipitation Dataset

作     者：杨溯 徐文慧 许艳 李庆祥 YANG Su;XU Wenhui;XU Yan;LI Qingxiang?

作者机构：National Meteorological Information CenterChina Meteorological Administration 

出 版 物：《Journal of Meteorological Research》 (气象学报(英文版))

年 卷 期：2016年第30卷第2期

页      面：217-231页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0824[工学-船舶与海洋工程] 0825[工学-航空宇航科学与技术] 

基　　金：Supported by the China Meteorological Administration Special Public Welfare Research Fund(GYHY201206012 and GYHY201406016) Climatic Change Special Fund of China Meteorological Administration(CCSF201338) 

主　　题：global precipitation observation historic data 

摘      要：Global historic precipitation dataset is the base for climate and water cycle research.There have been several global historic land surface precipitation datasets developed by international data centers such as the US National Climatic Data Center(NCDC),European Climate Assessment & Dataset project team,Met Office,etc.,but so far there are no such datasets developed by any research institute in China.In addition,each dataset has its own focus of study region,and the existing global precipitation datasets only contain sparse observational stations over China,which may result in uncertainties in East Asian precipitation studies.In order to take into account comprehensive historic information,users might need to employ two or more datasets.However,the non-uniform data formats,data units,station IDs,and so on add extra difficulties for users to exploit these datasets.For this reason,a complete historic precipitation dataset that takes advantages of various datasets has been developed and produced in the National Meteorological Information Center of China.Precipitation observations from 12 sources are aggregated,and the data formats,data units,and station IDs are unified.Duplicated stations with the same ID are identified,with duplicated observations removed.Consistency test,correlation coefficient test,significance t-test at the95%confidence level,and significance F-test at the 95%confidence level are conducted first to ensure the data reliability.Only those datasets that satisfy all the above four criteria are integrated to produce the China Meteorological Administration global precipitation(CGP) historic precipitation dataset version 1.0.It contains observations at 31 thousand stations with 1.87 x 107 data records,among which 4152 time series of precipitation are longer than 100 yr.This dataset plays a critical role in climate research due to its advantages in large data volume and high density of station network,compared to other datasets.Using the Penalized Maximal t-test method,significant inhomogeneity has been detected in historic precipitation datasets at 340 stations.The ratio method is then employed to effectively remove these remarkable change points.Global precipitation analysis based on CGP vl.O shows that rainfall has been increasing during1901-2013 with an increasing rate of 3.52 ± 0.5 mm(10 yr)-1,slightly higher than that in the NCDC data.Analysis also reveals distinguished long-term changing trends at different latitude zones.