Inhomogeneous trends in the onset date of extreme hot days in China over the last five decades |
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| Authors: | Yang Yang Zhaohui Lin Lifeng Luo Yan Zhang Zhen Li |
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| Affiliation: | 1. International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Department of Geography, Environment, and Spatial Sciences, Michigan State University, East Lansing, MI, USA;4. Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | Using a homogenized daily maximum temperature(Tmax)dataset across China,this study characterized the spa-tiotemporal variation of the onset date of extreme hot days in a year(i.e.,FirstEHD)during 1960-2018.Inho-mogeneous trends of FirstEHD over China during 1960-2018 can be found,with the advanced trend of FirstEHD over most parts in China,while a number of stations in North-Central China(NC)show the delayed trend of FirstEHD.Moreover,there exist interdecadal changes of FirstEHD trend,with a remarkable difference in the trend magnitude before and after the 1990s over South China(SC),and the sign of trend can even reverse from negative to positive after the 1990s in Xinjiang(XJ)and Yangtze River Basin(YR),and from positive to negative in NC.The overall trends of FirstEHD over NC,YR,and XJ during 1960-2018 are dominated by the trends before the 1990s,while they are dominated by the sharp advance after the 1990s over SC.It is further found that the trend of FirstEHD can generally be explained by the long-term trend in Tmax over most parts of China,but the contribution from Tmax variabilities is also non-negligible and can even account for more than 75％of the overall trend over NC.The possible factors responsible for the decadal changes in FirstEHD trends are also discussed. |
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| Keywords: | Extreme hot days Onset date Trend Decadal change Variability of maximum temperature |
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