Study on the variation of high temperature characteristic index of Ankang city in 1953—2020

doi:10.14088/j.cnki.issn0439-8114.2022.10.006

Abstract

Abstract: Based on the daily maximum temperature from 1953 to 2020 and daily minimum relative humidity from 1980 to 2020 in Ankang Meteorological Station, the high temperature characteristic indexes such as extreme high temperature, number of high temperature days, continuous high temperature process and number of extremely hot days were calculated and analyzed by using conventional climate statistical analysis, linear regression, 5-year moving average and Mann-Kendall test method. The results showed that the average extreme high temperature was 39 ℃ in Ankang city, with the most frequency in July; number of high temperature days occurred from April to September, with 25 d of the annual average number of high temperature days, and it was the most in July and August with the average monthly high temperature days for 9.5 days and 9.2 days, respectively; the hot weather occurred earlier on April 12, 1953 and lately on September 19, 2010, and the maximum extreme high temperature occurred on July 27, 2017 with 41.9 ℃; the average duration of high temperature was 3.4 times per year, with the average duration for 5.3 days and the longest duration up to 16 days; the number of extremely hot days occurred from June to September, when the relative humidity was high and the highest temperature was above 32.9 ℃. The annual average number of extremely hot days was significantly less than the number of high temperature days with 10.2 days, and 8.3% of the extremely hot days were not accompanied by high temperature days. The interdecadal variation of each high temperature characteristic index showed periodicity. The interdecadal variation of extreme high temperature, high temperature days and continuous high temperature times almost showed a high-low-flat-high fluctuation downward trend, while the number of very hot days was a low-high- slightly low-high fluctuating upward trend. Finally, There were mutations in the number of high temperature days, continuous high temperature days and extremely hot days except for extreme high temperature.

Key words: high temperature characteristics, trend analysis, mutation analysis, Ankang city

CLC Number:

REN Qing-qing, ZHANG Shu-lan, ZHANG Hai-jun, LIU Quan-yu. Study on the variation of high temperature characteristic index of Ankang city in 1953—2020[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(10): 33-38.

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