INVESTIGATION OF THE SPATIAL AND TEMPORAL DISTRIBUTION OF EXTREME HIGH TEMPERATURE IN CHINA WITH DETRENDED FLUCTUATION AND PERMUTATION ENTROPY |
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| Authors: | YIN Ji-fu ZHENG You-fei WU Rong-jun FU Ying and WANG Wei |
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| Institution: | College of Atmospheric physics, Nanjing University of Information Science& Technology, Nanjing 210044 China;College of Atmospheric physics, Nanjing University of Information Science & Technology, Nanjing 210044 China;College of Atmospheric physics, Nanjing University of Information Science & Technology, Nanjing 210044 China;College of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044 China;College of Atmospheric physics, Nanjing University of Information Science& Technology, Nanjing 210044 China;College of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044 China |
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| Abstract: | With temperatures increasing as a result of global warming,extreme high temperatures are becoming more intense and more frequent on larger scale during summer in China.In recent years,a variety of researches have examined the high temperature distribution in China.However,it hardly considers the variation of temperature data and systems when defining the threshold of extreme high temperature.In order to discern the spatio-temporal distribution of extreme heat in China,we examined the daily maximum temperature data of 83 observation stations in China from 1950 to 2008.The objective of this study was to understand the distribution characteristics of extreme high temperature events defined by Detrended Fluctuation Analysis(DFA).The statistical methods of Permutation Entropy(PE)were also used in this study to analyze the temporal distribution.The results showed that the frequency of extreme high temperature events in China presented 3 periods of 7,10—13 and 16—20 years,respectively.The abrupt changes generally happened in the 1960s,the end of 1970s and early 1980s.It was also found that the maximum frequency occurred in the early 1950s,and the frequency decreased sharply until the late 1980s when an evidently increasing trend emerged.Furthermore,the annual averaged frequency of extreme high temperature events reveals a decreasing-increasing-decreasing trend from southwest to northeast China,but an increasing-decreasing trend from southeast to northwest China.And the frequency was higher in southern region than that in northern region.Besides,the maximum and minimum of frequencies were relatively concentrated spatially.Our results also shed light on the reasons for the periods and abrupt changes of the frequency of extreme high temperature events in China. |
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| Keywords: | extreme high temperature events detrended fluctuation analysis permutation entropy spatial and temporal distribution |
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