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 and TU Kai |
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| Institution: | 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 of
warm days, cold days, warm nights and cold nights) with respect to a
modulated annual cycle (MAC), and those associated exclusively with
weather-intraseasonal fluctuations (WIF) in eastern China were investigated
based on an updated homogenized daily maximum and minimum temperature
dataset for 1960--2008. The Ensemble Empirical Mode Decomposition (EEMD)
method was used to isolate the WIF, MAC, and longer-term components from the
temperature series. The annual, winter and summer occurrences of warm (cold)
nights were found to have increased (decreased) significantly almost
everywhere, while those of warm (cold) days have increased (decreased) in
northern China (north of 40o). However, the four temperature extremes
associated exclusively with WIF for winter have decreased almost everywhere,
while those for summer have decreased in the north but increased in the
south. These characteristics agree with changes in the amplitude of WIF. In
particular, winter WIF of maximum temperature tended to weaken almost
everywhere, especially in eastern coastal areas (by 10%--20%); summer
WIF tended to intensify in southern China by 10%--20%. It is notable
that in northern China, the occurrence of warm days has increased, even
where that associated with WIF has decreased significantly. This suggests
that the recent increasing frequency of warm extremes is due to a
considerable rise in the mean temperature level, which surpasses the effect
of 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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