Spatiotemporal Variations of Extreme Temperature Indices in Different Climatic Zones of China over the Past 60 Years

doi:10.3969/j.issn.1000-6362.2019.07.002

Abstract

Abstract: Based on daily maximum and minimum temperature data during 1956-2015 obtained from 200 weather stations, ten extreme temperature indices recommended by ETCCDI were used to study the temporal trends of extreme temperature indices and their spatial distribution in four climatic zones of China, with the help of Mann-Kendall test, Sen’s slope estimator and Pettitt test. The results showed that, (1) warm nights (TN90p) and warm days (TX90p) tended to increase significantly in China over the past 60 years, with a rate of 2.12 and 1.00d10y-1 (P<0.01), but cold nights (TN10p) and cold days (TX10p) tended to decrease significantly, with a rate of 1.44 and 0.70d10y-1 (P<0.01), respectively. For threshold indices, the change rate of frost days (FD0) was -2.84d10y-1 (P<0.01), but the change rates of summer days (SU25) and tropical nights (TR20) were 1.77 and 1.44d10y-1 (P<0.01), respectively. For duration indices, warm spell duration index (WSPI) and growing season length (GSL) significantly increased, but cold spell duration index (CSDI) showed no significant trend during the period of 1956-2015. (2) The increasing rates of cold extremes were greater than those of warm extremes. Further, faster increases were observed for nightly indices related to the minimum temperature (e.g. TN10p, TN90p and FD0), compared with the daytime indices related to the maximum temperature (e.g. TX10p, TX90p and WSDI). (3) The abrupt change years of temperature extremes mainly occurred in the 1980s and 1990s. The change rates of most temrepature extreme indices were more significant after the mid-1980s than those before the mid-1980s. (4) The change rates of extreme temperature indices varied greatly among different climatic zones, with the greatest decreases in cold extreme indices in the mountain plateau zone and the greatest increases in warm extreme indices such as SU25, TR20 and WSDI in the subtropical monsoon zone.

Key words: Climate change, Extreme tempreature, Trend analysis, Abrupt change detection

ZHANG Da-ren, ZHENG Jing, FAN Jun-liang, FANG Zhi-chao, JI Qing-yuan, YUAN Ye-zi, LIU Wen-fei . Spatiotemporal Variations of Extreme Temperature Indices in Different Climatic Zones of China over the Past 60 Years[J]. Chinese Journal of Agrometeorology, 2019, 40(07): 422-434.

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