Trends in extreme climatic indices across the temperate steppes of China from 1961 to 2013  

作　　者：Yang Li Yuhui Wang Jianmin Song 

机构地区：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,20 Nanxincun,Xiangshan,Beijing 100093,China [2]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,11A,Datun Road,Chaoyang District,Beijing 100101,China [3]University of Chinese Academy of Sciences,19A Yuquan Road,Beijing 100049,China

出　　处：《Journal of Plant Ecology》2019年第3期485-497,共13页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(41775108);Agriculture to Climate Change(132020010406);Industry of National Public Welfare(Meteorological)Scientific Research(GYHY201406034).Conflict of interest.None declared.

摘　　要：Aims Extreme climate events have become more severe and frequent with global change in recent years.The Chinese temperate steppes are an important component of the Eurasian steppes and highly sensitive and vulnerable to climatic change.As a result,the occur-rence of extreme climate events must have strong impacts on the temperate steppes.Therefore,understanding the spatio-temporal trends in extreme climate is important for us to assess the sensitivity and vulnerability of Chinese temperate steppes to climatic changes.This research had two specific objects to(i)specify the temporal changes in extreme climate events across the whole steppe and(ii)compare the trend differences for extreme climate events in differ-ent types of steppes-meadow steppe,typical steppe and desert steppe.Methods To investigate extreme climate trends in the temperate steppes of China,82 meteorological stations with daily temperature and precipi-tation data(1961-2013)were used.Meanwhile,eight core extreme climate indices(extreme high-temperature threshold,extreme low-temperature threshold,frost days,heatwave duration,heavy rain-fall threshold,percentage of heavy rainfall,heavy rainfall days and consecutive dry days)from the Statistical and Regional Dynamical Downscaling of Extremes for European Regions(STARDEX)project were selected to analyse the trends in extreme climate across the whole temperate steppe and the three main types(meadow steppe,typical steppe and desert steppe)through time and space.Important Findings The results showed that(i)the changes in extreme climatic tem-perature events across the whole temperate steppe were obvi-ous during 1961-2013.The frost days(−3.40 days/10 year[yr])decreased significantly,while the extreme high-temperature thresh-old(0.24℃/10 yr),extreme low-temperature threshold(0.52℃/10 yr),and heatwave duration(0.58 days/10 yr)increased notably.The annual changes in extreme precipitation were small and not sig-nificant.(ii)Differences appeared in the extreme climatic trends in different types of steppes.

关 键 词：TREND extreme climatic indices temperate steppe extreme precipitation extreme temperature 

分 类 号：P46[天文地球—大气科学及气象学]