Temporal variations of reference evapotranspiration and controlling factors: Implications for climatic drought in karst areas

Xiao-jiao Guo; Wen-zhong Wang; Cheng-xi Li; Wei Wang; Jian-sheng Shi; Ying Miao; Xing-bo Hao; Dao-xian Yuan

doi:10.19637/j.cnki.2305-7068.2022.03.005

Volume 10 Issue 3

Sep. 2022

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Article Navigation > Journal of Groundwater Science and Engineering > 2022 > 10(3): 267-284

Guo XJ, Wang WZ, Li CX, et al. 2022. Temporal variations of reference evapotranspiration and controlling factors: Implications for climatic drought in karst areas. Journal of Groundwater Science and Engineering, 10(3): 267-284 doi: 10.19637/j.cnki.2305-7068.2022.03.005

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Temporal variations of reference evapotranspiration and controlling factors: Implications for climatic drought in karst areas

doi: 10.19637/j.cnki.2305-7068.2022.03.005

1.
Key Laboratory of Groundwater Sciences and Engineering, Ministry of Natural Resources, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2.
Ecogeological Survey Center of China Geological Survey, China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
3.
China University of Geosciences (Wuhan), Wuhan 430074, China
4.
Key Laboratory of Karst Dynamics, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China
5.
Geological Exploration Institute of Shandong Zhengyuan, China Metallurgical Geology Bureau, Jinan 250101, China
6.
Hebei Coal Geology Bureau fourth Geological Brigade, Zhangjiakou 075100, Hebei, China

More Information

Corresponding author: ww@mail.cgs.gov.cn
Received Date: 2021-11-06
Accepted Date: 2022-06-18
Publish Date: 2022-09-15

Abstract

Abstract

Variations in reference evapotranspiration (ET₀) and drought characteristics play a key role in the effect of climate change on water cycle and associated ecohydrological patterns. The accurate estimation of ET₀ is still a challenge due to the lack of meteorological data and the heterogeneity of hydrological system. Although there is an increasing trend in extreme drought events with global climate change, the relationship between ET₀ and aridity index in karst areas has been poorly studied. In this study, we used the Penman–Monteith method based on a long time series of meteorological data from 1951 to 2015 to calculate ET₀ in a typical karst area, Guilin, Southwest China. The temporal variations in climate variables, ET₀ and aridity index (AI) were analyzed with the Mann–Kendall trend test and linear regression to determine the climatic characteristics, associated controlling factors of ET₀ variations, and further to estimate the relationship between ET₀ and AI. We found that the mean, maximum and minimum temperatures had increased significantly during the 65-year study period, while sunshine duration, wind speed and relative humidity exhibited significant decreasing trends. The annual ET₀ showed a significant decreasing trend at the rate of −8.02 mm/10a. However, significant increase in air temperature should have contributed to the enhancement of ET₀, indicating an “evaporation paradox”. In comparison, AI showed a slightly declining trend of −0.0005/a during 1951–2015. The change in sunshine duration was the major factor causing the decrease in ET₀, followed by wind speed. AI had a higher correlation with precipitation amount, indicating that the variations of AI was more dependent on precipitation, but not substantially dependent on the ET₀. Although AI was not directly related to ET₀, ET₀ had a major contribution to seasonal AI changes. The seasonal variations of ET₀ played a critical role in dryness/wetness changes to regulate water and energy supply, which can lead to seasonal droughts or water shortages in karst areas. Overall, these findings provide an important reference for the management of agricultural production and water resources, and have an important implication for drought in karst regions of China.
- Reference evapotranspiration,
- Aridity index,
- Penman–Monteith method,
- Sunshine duration,
- Guilin

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References(80)

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