Preprints
https://doi.org/10.5194/angeo-2022-19
https://doi.org/10.5194/angeo-2022-19
 
21 Nov 2022
21 Nov 2022
Status: this preprint is currently under review for the journal ANGEO.

Asymmetric changes of maximum and minimum temperatures in the Dabie Mountains, China

Yongmei Zhao1, Liyan Tang1, Changming Zhu2, Yuan Luo3, and Fang Zhou4 Yongmei Zhao et al.
  • 1School of Environment and Tourism, West Anhui University, Lu’an, China
  • 2School of Geographic Surveying, Mapping and Urban–Rural Planning, Jiangsu Normal University, Xuzhou, China
  • 3Lu’an Meteorological Bureau, Lu’an, China
  • 4School of Finance and Mathematics, West Anhui University, Lu’an, China

Abstract. This study used high-quality daily temperature data from 1960–2019, recorded at five observing stations (Huoqiu, Huoshan, Jinzhai, Lu’an, and Shucheng) in the city of Lu’an (China), to study the asymmetric changes of maximum and minimum temperatures in the region of the Dabie Mountains in western Anhui Province (China). Results showed that changes in annual maximum and minimum temperatures over the studied 60 years were asymmetric; the average climatic trend rate of minimum temperature was 0.262 °C/10a, while that of maximum temperature was 0.198 °C/10a, i.e., the temperature increase of the former was approximately 1.3 times that of the latter. Asymmetric changes of maximum and minimum temperatures were evident in winter, summer, and autumn throughout the entire 60-year period and in spring for the first 45 years. The spatial distribution of the asymmetric changes was uneven with decrease both from high latitudes to low latitudes and from high elevations to low elevations. High-elevation high-latitude areas such as Jinzhai, Lu’an, and Huoqiu exhibited the most significant asymmetric changes seasonally and annually. Abrupt changes in the trends of maximum and minimum temperatures occurred in 1994. Three periodicities were found in the maximum temperature series, i.e., 15–18, 32, and 4–6 years, and four periodicities were found in the minimum temperature series, i.e., 9–10, 32, 20–22, and 4 years. The 4–6-year periodicity of maximum temperature and the 4-year periodicity of minimum temperature (which passed the 95% significance test) should be associated with El Niño.

Yongmei Zhao et al.

Status: open (until 02 Jan 2023)

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Yongmei Zhao et al.

Yongmei Zhao et al.

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Short summary
Over the 60-year study period, the increase of Tm in Lu'an City was greater than that of TM, the two showed asymmetric changes. High-elevation high-latitude areas such as Jinzhai, Lu’an, and Huoqiu were the regions with the most significant asymmetric changes.In 1994, TM and Tm both experienced abrupt change in their rate of increase. TM exhibited three periodicities of 15–18, 32, and 4–6 years ; Tm exhibited four periodicities of 9–10, 32, 20–22, and 4 years.