首页|Spatio-temporal patterns of temperature extremes and their response to atmospheric circulation factors in China from 1961 to 2020
Spatio-temporal patterns of temperature extremes and their response to atmospheric circulation factors in China from 1961 to 2020
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Changes in surface temperature extremes have become a global concern.Based on the daily lowest temperature(TN)and daily highest temperature(TX)data from 2138 weather stations in China from 1961 to 2020,we calculated 14 extreme temperature indices to analyze the characteristics of extreme temperature events.The widespread changes ob-served in all extreme temperature indices suggest that China experienced significant warming during this period.Specifically,the cold extreme indices,such as cold nights,cold days,frost days,icing days,and the cold spell duration index,decreased significantly by-6.64,-2.67,-2.96,-0.97,and-1.01 days/decade,respectively.In contrast,we observed significant in-creases in warm extreme indices.The number of warm nights,warm days,summer days,tropical nights,and warm spell duration index increased by 8.44,5.18,2.81,2.50,and 1.66 d/decade,respectively.In addition,the lowest TN,highest TN,lowest TX,and highest TX over the entire period rose by 0.47,0.22,0.26,and 0.16℃/decade,respectively.Furthermore,using Pearson's correlation and wavelet coherence analyses,this study identified a strong association between extreme temperature indices and atmospheric circulation factors,with varying correlation strengths and resonance periods across different time-frequency domains.
temperature changesglobal warmingatmospheric circulationwavelet coherence analysisChina
LUO Yuanbo、ZHOU Yuke、ZHOU Chenghu
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State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sci-ences and Natural Resources Research,CAS,Beijing 100101,China
University of Chinese Academy of Sciences,Beijing 100049,China
Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China
National Key Research and Development Program of China
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