Spatio-temporal variations of the extreme temperature in the Yangtze River Delta during 1960-2012
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Abstract:
Base on the daily temperature data of 34 meteorological stations in the Yangtze River Delta region during 1960~2012, by using trend analysis, wavelet analysis, Mann-Kendall test, and spline interpolation method, the temporal and spatial variation characteristics of extreme temperature in Yangtze River Delta were analyzed. The results showed that: in recent 53 years, cold index showed a significantly upward trend, and passed the 0.01 reliability test, with the climate tendency rate of -2.8d/10a, -4.1d/10a and 0.45℃/10a, respectively. The warm index had a rising trend but the trend was not significant, only warm day index and the extreme maximum temperature passed the 0.05 reliability test. From a spatial distribution perspective, the number of high temperature days and the extreme maximum temperature showed the distribution rules of north low and south high, east low and west high, and coastal low and inland high. Low temperature days and extreme minimum temperature were contrary. From a change trend perspective, extreme temperature index showed a rising trend, and the most obvious upward trend areas of the extreme low and extreme high temperature were Shanghai, Nanjing, Hangzhou and other large cities and surrounding areas.