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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (3): 337-348.doi: 10.12118/j.issn.1000-6060.2022.289

• Climatology and Hydrology • Previous Articles     Next Articles

Interannual variations of extreme air temperature events and its response to regional warming in Shanxi Province in recent 60 years

LI Na1(),WU Yongli1(),ZHAO Guixiang1,QIAN Jinxia1,LI Fen2,ZHAO Haiying1,HAN Pu1   

  1. 1. Shanxi Meteorological Observatory, Taiyuan 030006, Shanxi, China
    2. Meteorological Disaster Prevention Technology Center of Shanxi Province, Taiyuan 030032, Shanxi, China
  • Received:2022-06-15 Revised:2022-07-24 Online:2023-03-25 Published:2023-03-31
  • Contact: Yongli WU E-mail:nali85@163.com;wu_yongli@sina.com

Abstract:

Extreme temperature is an important indicator of climate change. Under the background of global warming, disaster events (warm winter, drought, and heat wave) caused by extreme temperature changes are also becoming increasingly frequent, which pose a serious threat to the ecological system and agricultural production. Therefore, studying and predicting the occurrence of extreme temperature events are particularly important. On the basis of the daily maximum, minimum, and average temperature data of 70 meteorological stations, eight extreme temperature indices were analyzed to obtain spatial and temporal variations of extreme temperature events, and their response to regional warming was examined in Shanxi Province, China, from 1960 to 2019. The following results are presented. (1) The occurrence of summer days, tropical nights, annual maximum value of daily minimum temperature, and annual minimum value of daily minimum temperature showed a significant upward trend, whereas the occurrence of ice and frost days showed a significant downward trend. (2) The annual maximum or minimum value of daily maximum and minimum temperatures showed warming trends, and the change rates of annual minimum value of daily maximum and minimum temperatures were large in most regions. (3) The annual average temperature in the study area presented a statistically significant increasing trend at a rate of 0.26 ℃·(10a)-1. The spatial distribution of the warming rate increased from southeast to northwest. The changes in extreme temperature indices demonstrated remarkably significant responses to climate warming. The responses of frost days and annual maximum value of daily minimum temperature to regional warming were highly sensitive. (4) In semiarid regions of Shanxi Province, the rising rate of annual maximum and minimum values of daily minimum temperature was large and ice days had a rapid reduction. In the semihumid area of Shanxi Province, tropical nights demonstrated rapid increase, whereas frost days revealed a rapid reduction.

Key words: extreme temperature indices, spatiotemporal variations, climate change, Shanxi Province