关键词: 极端升温过程, 频数, 强度, 气候变化, 帕米尔高原

Abstract: The single-station databases of temperature-rising process at 3 meteorological stations including Tashkurgan, Turgart and Wuqia in the east Pamirs were established using the data of daily maximum temperature from January 1, 1961 to December 31, 2017. The three databases of extreme temperature-rising process were selected using the percentile method of comprehensive intensity. The change characteristics of frequency and intensity of extreme temperature-rising process at the three stations were compared and analyzed. The results showed that: ① There were totally 489 extreme temperature-rising processes, and the annual average was 8.6 times at Taxkorgan Meteorological Station in the east Pamirs from 1961 to 2017. At Taxkorgan, the average duration of extreme temperature-rising process was 3.6 days, the occurring frequency of 3-day duration was the highest and accounted for 24.7% of the total. The 2-3-day duration was dominant at Turgart and Wuqia. The extreme temperature-rising process occurred most frequently in July at Taxkorgan, in May at Turgart and in January at Wuqia; ②The extreme temperature-rising process with the strongest comprehensive intensity at Taxkorgan occurred during February 20-21, 2008. The comprehensive intensity of extreme temperature-rising processes was the strongest in winter at the 3 stations in the east Pamirs; ③ In recent 57 years, the annual frequency of extreme temperature-rising process was in a significant linear increasing trend, and the decadal increase rate was 0.57 times at Taxkorgan. The extreme temperature-rising process was relatively frequent from the beginning of the 21st century, and the interannual variability was intensified. The linear trend of the annual frequency of extreme temperature-rising processes was not significant at Turgart and Wuqia；④In recent 57 years, the intensity of the extreme temperature-rising process was in a significant linear increasing trend, and the interannual variation was intensified in recent years. The intensity of extreme temperature-rising process was slightly decreased, and the range of interannual change was decreased in recent years at Wuqia. In a word, at Taxkorgan, the extreme temperature-rising process occurred most frequently in July. The frequency and intensity of extreme temperature-rising process increased significantly at Taxkorgan in past 57 years, and the interannual variation intensified in recent years. Ice-snow melting floods and their derivative geological hazards occurred frequently along the northern section of the “China-Pakistan Economic Corridor” in the east Pamirs.

Key words: extreme temperature-rising process')">

extreme temperature-rising process, frequency; intensity, climate change,   ')">Pamirs