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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (2): 211-221.doi: 10.12118/j.issn.1000-6060.2022.214

• Climate and Environment Change • Previous Articles     Next Articles

Temporal and spatial variation characteristics of high temperature and heat wave in the Weihe River Basin from 1980 to 2020

DENG Tiantian(),GENG Guangpo(),YANG Rui,ZHANG Bao   

  1. College of Surveying and Mapping Science and Technology, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
  • Received:2022-05-11 Revised:2022-06-08 Online:2023-02-25 Published:2023-03-14

Abstract:

Based on the 1980 to 2020 daily maximum temperature data of 24 meteorological stations, this study uses the Sen+Mann-Kendall trend analysis method to investigate the spatial-temporal characteristics of high temperature and heat wave in the Weihe River Basin, northwest China in the past 40 years. The multi-year average of the high temperature days in the Weihe River Basin was 3.54 days, showing an extremely significant increase trend at a 1 d·(10a)-1 rate. The stations in this basin presented spatial distributions of less in the northwest and more in the southeast. The increasing trend of high temperature days in Guanzhong Plain was the most significant. The first day of high temperature was in late April, while the last day was in early September. The first day at most stations in the Weihe River Basin was significantly advanced by approximately 3-5 d·(10a)-1, while the last day of nearly half of the stations was significantly delayed by approximately 3 d·(10a)-1. These results indicate that the total time affected by the high temperature in the Weihe River Basin became longer. Next, the occurrence of severe high temperature and heat wave accounted for 10.32%, suggesting that at least one of every 10 incidents was a severe high temperature and heat wave. Stations with a higher frequency and a longer duration of high temperature and heat wave of different levels were distributed in Guanzhong Plain, indicating that the plain was the main part of the high temperature and heat wave in Weihe River Basin. The high temperature and heat wave intensity in different periods showed a significant upward trend as a whole, suggesting that the intensity may increase in the future. However, this will pose a serious threat to human health and to the industrial and agricultural production in the basin, requiring adequate attention from relevant departments. This study could provide a reference for mitigating the high-temperature and heat wave disaster in the Weihe River Basin.

Key words: high temperature and heat wave, trend analysis, temporal and spatial variation, intensity, Weihe River Basin