Spatial division of climate change and its evolution characteristics in Southwest China based on REOF-EEMD
LIU Xiaoqiong1,2, SUN Xiliang2, LIU Yansui3, ZHANG Jian2,4, ZHAO Xinzheng1,2, RUI Yang,1,21.The Provincial Key Laboratory of Surface System and Environment Capacity, Northwest University, Xi′an 710127, China 2.College of Urban and Environmental Sciences, Northwest University, Xi′an 710127, China 3.Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 4.Institute of Silk Road Studies China, Northwest University, Xi'an 710069, China
Received:2019-05-15Revised:2019-12-24Online:2020-05-20 作者简介 About authors 刘晓琼(1977-),女,青海湟源人,博士,副教授,博士生导师,主要研究方向为城乡发展与气候变化研究E-mail:xiaoqiongliu2001@163.com。
Abstract Southwest China is a special region in the context of global climate change. It is crucial to study the climate change in different parts of this region. In addition, it is important to explore the climate change characteristics of the counties in the study area which have benchmark meteorological stations. In this paper, the Rotated Empirical Orthogonal Function (REOF) was chosen to carry out climate regionalization according to annual mean temperature and annual mean precipitation change in Southwest China. Despite that, the Ensemble Empirical Mode Decomposition (EEMD), Bernaola Galvan heuristic Segmentation Algorithm (BGSA) and other methods were used to analyze the spatio-temporal evolution of climate change in subregions of the study area. Here are the results: (1) According to annual mean temperature and annual mean precipitation changes, the temperature and precipitation changes in the study area could be regionalized into three subregions respectively. The spatial boundaries of these two types of subregions were extremely similar, and the southern boundaries of precipitation subregions II and III were much more boarder than those of the temperature subregions II and III. (2) Annual mean temperatures in three temperature subregions have been rising significantly since 1950, and the temperature changes in Sichuan and Chongqing kept pace with global warming. It is worth mentioning that there were several cold areas sporadically distributed in the western Guizhou, the central Guizhou and the northern Yunnan. In terms of precipitation subregions, the spatial and temporal differences of annual mean precipitation were much larger, and the spatial and temporal differences of the interdecadal variation in the precipitation subregions I and II were more prominent than those in the precipitation region III. (3) The ENSO events had a profound influence on the climate change of Southwest China, and these three temperature and precipitation subregions responded differently to it. (4) The convergence of mutational site of annual mean temperature series in the three temperature subregions was strong (which all began around the year 1997), while that of annual mean precipitation series in the three precipitation subregions was relatively weak. (5) The climate warming trends in the three temperature subregions were obvious, especially in the subregions I and II. Regarding to annual mean precipitation, the trends of the precipitation in subregions I and II had certain randomness, the trend of annual mean precipitation in precipitation subregion I may decelerate with slower deceleration, and that in precipitation subregion II may weakly decelerate, while that of subregion III may weakly accelerate. Keywords:climate change;EEMD;REOF;climate regionalization;spatial and temporal evolution;Southwest China
PDF (16925KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 刘晓琼, 孙曦亮, 刘彦随, 张健, 赵新正, 芮旸. 基于REOF-EEMD的西南地区气候变化区域分异特征. 地理研究[J], 2020, 39(5): 1215-1232 doi:10.11821/dlyj020190387 LIU Xiaoqiong. Spatial division of climate change and its evolution characteristics in Southwest China based on REOF-EEMD. Geographical Research[J], 2020, 39(5): 1215-1232 doi:10.11821/dlyj020190387
Tab. 1 表1 表1基于EOF、REOF的西南地区年均温、年均降水前3个模态的方差贡献率和累计方差贡献率 Tab. 1Variance contribution rate and cumulative variance contribution rate of the first 3 modes of the annual mean temperature and annual mean precipitation based on EOF and REOF in Southwest China (%)
Tab. 2 表2 表21960—2016年西南地区气候变化突变点综合诊断 Tab. 2Synthetic diagnosis result about catastrophe point of the annual mean temperature and annual mean precipitation series in Southwest China from 1960 to 2016
Fig. 7Decomposition of the annual mean precipitation of three subregions in Southwest China based on EEMD
Tab. 3 表3 表3西南地区各气候变化分区年均温、年均降水序列的IMF分量周期、方差贡献率及相关系数 Tab. 3Periodicity, variance contribution rate and correlation coefficient of the annual mean temperature and annual mean precipitation of three subregions in Southwest China from 1960 to 2016
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