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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (5): 139-154.DOI: 10.7522/j.issn.1000-694X.2023.00033

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Response of surface evapotranspiration to the East Asian summer monsoon over the summer monsoon transition zone of China

Hongyu Li1,2(), Qiang Zhang2, Ping Yue2, Jian Zeng3(), Xiaonan Guo1   

  1. 1.Hebei International Joint Research Center for Remote Sensing of Agricultural Drought Monitoring / School of Land Science and Space Planning,Hebei GEO University,Shijiazhuang 050031,China
    2.Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster / CMA Key Open Laboratory of Arid Climatic Change and Disaster Reduction,Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China
    3.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China
  • Received:2023-01-11 Revised:2023-04-12 Online:2023-09-20 Published:2023-09-27
  • Contact: Jian Zeng

Abstract:

Exploring the response of evapotranspiration (ET) spatio-temporal pattern to the East Asian summer monsoon (EASM) is important to understand the terrestrial hydrological cycle. The paper focuses on the summer monsoon transition zone (SMTZ) in China where the climate is rather sensitive to summer monsoon activity, and analyzed the response of ET in the SMTZ to EASM activity. The study evaluated six global ET products widely used based on ET observation data collected from fourteen sites over Northern China,and then conducted a comparison of them in interannual variations of ET over SMTZ. Results indicate that JRA-55(Japanese 55-Year Reanalysis) can simulate ET at the site scale well, and reasonably depict the long-term interannual variation of the average ET over the SMTZ. Therefore, JRA-55 is used as the reference ET data set in this study. The summer monsoon activity is identified over the SMTZ by adopting a monsoon temporal duration index (MTDI) which is related with interannual variations of summer rainfall more closely than commonly used summer monsoon intensity indexes. This study found an obviously unlinear response of evapotranspiration to MTDI and the evapotranspiration exhibits approximately logarithmic/power function curve with the MTDI. High interannual variability of evapotranspiration was observed due to high sensitivity to MTDI during weak EASM years. The result from ensemble empirical mode decomposition further indicates that the summer monsoon activity significantly affects the evapotranspiration variation on three-year, interdecadal and long-term scales. The summer monsoon activity is expected to strengthen in the future, which is very likely to intensify the water cycle and affect the availability of water resources and the ecosystem stability over the SMTZ.

Key words: summer monsoon, transition zone, evapotranspiration, simulation ability, temporal duration

CLC Number: