A Study on Spatiotemporal Changes of Extreme Temperature in Qinling Mountains During 1960-2022
To study changes in extreme temperatures in the Qinling Mountains,based on the daily maximum temperature,daily minimum temperature,and the average temperature data from 32 meteorological stations in the Qinling Mountains from 1960 to 2022,8 extreme temperature indices were obtained using RClimDex software.Linear regression,M-K test,Kriging interpolation and correlation analysis were used to study the spatiotemporal variation characteristics of extreme temperature in the extreme Qinling Mountains.The results showed that:the extreme warm index of the polar atmosphere in the Qinling Mountains during 1960-2022 has increased,while the extreme cold index has decreased,and the change in the warm index was greater than that in the cold index.There was an asymmetric change between the extreme air warm index and the extreme temperature cold index.The annual extreme maximum temperature in the Qinling Mountains showed a significant upward trend,with a change rate of 0.2 ℃/10 a.The annual extreme minimum temperature showed an insignificant upward trend,with a change rate of 0.17 ℃/10 a.The number of warm day days,warm night days,and crop growth season length showed extremely significant upward trends at rates of 3.23 d/10 a,2.95 d/10 a,and 3.65 d/10 a,respectively.The number of cold day days and cold night days decreased significantly at rates of 1.94 d/10 a and 2.32 d/10 a,respectively.The sudden change in the trend of extreme temperature index in the Qinling Mountains over the past 63 years mainly occurred in the 1990s.The trend of extreme index changes in the Qinling Mountains showed different correlations with altitude.The duration of extreme temperature changes is most pronounced in middle and low altitude areas,while the frequency and intensity of extreme temperature changes were most pronounced in high altitude areas.
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