ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics of Extreme Temperature Change in Hebei Province
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Abstract:
This paper has investigated the characteristics of extreme temperature change in Hebei Province for the period of 1961-2008 by using the daily temperature data from 60 stations. The results show that the extreme maximum temperature linear trend is not obvious, but with a noticeable interdecadal variation. The extreme minimum temperature has a significantly linear increased trend. The extreme cold days below -30 ℃ are in a linearly decreased trend, and the extreme hot days above 40 ℃ not in the linear change trend, but with the characteristics of interdecadal variation. The days for low temperature below -10 ℃ show a decreased trend, and days occurring in 20-30 ℃ have a significant increased trend. Apparently, the days for high temperature in -30-0 ℃ have a significantly reduced trend. In Hebei Province, frostfree period and nonfrozen period show a significant extended trend, extending 4.5 days and 4.6 days averaged for every ten years respectively. The annual averaged high, low and mean temperature are all in a significant linear increased trend, rising 0.21 ℃, 0.45 ℃， and 0.30 ℃ averaged for every ten years respectively. The increasing rate of low temperature is significantly greater than that of high temperature. The low temperature has a significant increased trend in whole Hebei Province area, while the high temperature increased mainly in the northcentral and eastern coastal parts, not obvious in the southern regions.
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