Evapotranspiration Variations of the Minjiang River Basin in Southeastern China from 2000 to 2019

Atmosphere

Yuanyuan Wang¹  Haijun Deng¹  Xingwei Chen¹  Yijin Lu¹  Qun Liu¹  Lu Gao¹  Ying Chen¹  Meibing Liu¹  Yuqing Zhang² 

[1] National Demonstration Center for Experimental Geography Education, Fujian Normal University, Fuzhou 350007, China;School of Urban and Environmental Science, Huaiyin Normal University, Huai’an 223300, China;

关键词: evapotranspiration;    Penman-Monteith equation;    GLDAS-Noah model;    climate change;    Minjiang river basin;   

DOI  :  10.3390/atmos13040562

来源: DOAJ

【 摘 要 】

Evapotranspiration is one of the critical processes in the terrestrial hydrological cycle, and the assessment of evapotranspiration is essential for understanding the regional hydrological cycle. In this study, the Minjiang River Basin, a typical watershed in the humid subtropical climate zone, is selected as the study region. The Penman-Monteith equation and the dual crop coefficient method are used to calculate the actual evapotranspiration (ET_a) at seven meteorological stations within the study basin. Meanwhile, the applicability of the Global Land Data Assimilation System-Noah (GLDAS-Noah) ET_a data in the Minjiang River Basin is evaluated based on stations P-M equation results, then to analyze the changes of the ET_a in the Minjiang River Basin from 2000 to 2019. The results show that the GLDAS-Noah ET_a data are well applicable in the Minjiang River Basin (R² > 0.9 and NSE > 0.8). The ET_a in the basin shows an increasing trend since 2000, and the increasing rate is 3.60 mm·yr⁻¹ (p < 0.01). The seasonal variation results show that ET_a tends to increase in winter and spring, with increasing rates of 1.10 mm·yr⁻¹ (p < 0.01) and 2.60 mm·yr⁻¹ (p < 0.01), respectively, while the ET_a did not change significantly in summer and autumn. Annual air temperature has the largest effect on annual ET_a (59.6%), followed by precipitation at 33.9%. ET_a increased in spring was mainly influenced by increasing temperatures (89.4%) in the Minjiang River Basin from 2000 to 2019. The research results are of great benefit to further improve the understanding of ET_a variations in the basin under global warming.

【 授权许可】

Unknown