EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dry and wet climatic change and its driving factors in China 

Jie Tang, Wenting Wang, and Yun Xie
Jie Tang et al.
  • Beijing Normal University, Faculty of Geographical Science, Faculty of Geographical Science, China (

Evaluating the characteristics of long-term dry and wet climate changes under the background of global climate change is important for regional water resources security, ecosystem security and socio-economic development. Based on the daily meteorological data of 1680 meteorological stations in China from 1971 to 2019, the reference evapotranspiration (ET0) was estimated with the FAO-56 Penman–Monteith equation. Based on which, the temporal and spatial variations of humidity index (HI), precipitation (P), reference evapotranspiration (ET0) and the driving factors of which were further analyzed. Results showed that HI significantly increased in the northwest China of arid area, the northeast China of subhumid area and the Huang-Huai region of humid area, while it significantly decreased in the southwest and southeast China of humid areas. The change of HI can be mainly attributed to the change of ET0 while no significant trends has been detected for P for most regions of China. During the past 50 years, the increasing rate of ET0 was 3.76 mm/10a. But the temporal variation of ET0 are different from regions, and the increasing and decreasing area were mainly dominated by climate different factors. For region of Huang-huai and northern Northeast China, ET0 showed significant downward trend. Among factors that relating to ET0, wind speed contributes most to the significant decrease of ET0. For all rest regions of China, ET0 showed significant upward trends, and relative humidity contribute most to the increase.


Key words: Dry and wet climatic change, humidity index, reference evapotranspiration, contribution, climatic factors.

How to cite: Tang, J., Wang, W., and Xie, Y.: Dry and wet climatic change and its driving factors in China , EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-16753,, 2023.