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| DOI：10.13522/j.cnki.ggps.2025387 |
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| Spatiotemporal variations of temperature in Handan City |
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Qiao Ping, Li Rui, Lyu Hengliang, Xie Xiangyong
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1. Handan Meteorological Bureau, Handan 056001, China;
2. Handan Key Laboratory of Smart Agriculture and Ecological Meteorological Services, Handan 056001, China;
3. Shuozhou Meteorological Bureau, Shuozhou 036002, China
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| Abstract: |
| 【Objective】Temperature is an important factor affecting almost everything on the planet. This paper analyses the spatiotemporal variation of temperature in Handan City over the past five decades.【Method】The analysis was based on daily temperature data measured during 1974–2024 from 16 meteorological stations across the region. We systematically investigated the spatiotemporal variation in temperature and predicted its future changes using multiple statistical methods, including empirical orthogonal function (EOF), Mann-Kendall mutation test, Morlet wavelet analysis and R/S analysis.【Result】Temporally, the annual mean temperature, annual mean daily maximum temperature, and annual mean daily minimum temperature showed increasing but fluctuating trends, at increasing rates of 0.39 ℃/10 a, 0.26 ℃/10 a, and 0.56 ℃/10 a, respectively. Similarly, annual extreme maximum and minimum temperatures also showed increasing yet fluctuating trends, at the rates of 0.24 ℃/10 a and 0.73 ℃/10 a, respectively. A transition from a cold period to a warm period occurred in the 1990s. Seasonal mean temperature increased from 1974 to 2024, with spring temperature showing the most significant increase. Spatially, temperature was higher in the south-central region and lower in the western mountainous region. Abrupt changes occurred in 2004, 2016, 2001, 2021 and 2005 for annual mean temperature, annual mean maximum temperature, annual mean minimum temperature, annual extreme maximum temperature, and annual extreme minimum temperature, respectively. Both annual mean temperature and annual mean maximum temperature showed periodic oscillations.【Conclusion】Handan City experienced a significant rise in temperature from 1974 to 2024. Affected by global warming and regional urbanization, this warming trend is likely to continue, accompanied by an increased frequency of extreme temperature events. |
| Key words: climate change; air temperature; Morlet wavelet; R/S analysis |
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