Trends in Temperature Extremes in Association with Weather-Intraseasonal Fluctuations in Eastern China |
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| Authors: | QIAN Cheng YAN Zhongwei Zhaohua WU FU Congbin TU Kai |
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| Affiliation: | Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Department of Earth, Ocean and Atmospheric Science & Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, Florida, USA,Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Trends in the frequencies of four temperature extremes (the occurrence ofwarm days, cold days, warm nights and cold nights) with respect to amodulated annual cycle (MAC), and those associated exclusively withweather-intraseasonal fluctuations (WIF) in eastern China were investigatedbased on an updated homogenized daily maximum and minimum temperaturedataset for 1960--2008. The Ensemble Empirical Mode Decomposition (EEMD)method was used to isolate the WIF, MAC, and longer-term components from thetemperature series. The annual, winter and summer occurrences of warm (cold)nights were found to have increased (decreased) significantly almosteverywhere, while those of warm (cold) days have increased (decreased) innorthern China (north of 40o). However, the four temperature extremesassociated exclusively with WIF for winter have decreased almost everywhere,while those for summer have decreased in the north but increased in thesouth. These characteristics agree with changes in the amplitude of WIF. Inparticular, winter WIF of maximum temperature tended to weaken almosteverywhere, especially in eastern coastal areas (by 10%--20%); summerWIF tended to intensify in southern China by 10%--20%. It is notablethat in northern China, the occurrence of warm days has increased, evenwhere that associated with WIF has decreased significantly. This suggeststhat the recent increasing frequency of warm extremes is due to aconsiderable rise in the mean temperature level, which surpasses the effectof the weakening weather fluctuations in northern China. |
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| Keywords: | climate extremes EEMD weather-intraseasonal fluctuations modulated annual cycle global warming |
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