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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (10): 3489-3498.doi: 10.13287/j.1001-9332.202010.012

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Spatiotemporal variation of reference evapotranspiration in Shanxi Province, China

LI Na1, HUO Zhi-guo2,3*, ZHOU Xiao-yu4, BAI Qin-feng5, PEI Xiu-miao6, QIAN Jin-xia1   

  1. 1Shanxi Meteorological Observatory, Taiyuan 030006, China;
    2Chinese Academy of Meteorological Sciences, Beijing 100081, China;
    3Collaborative Innovation Center of Meteorological Disaster Forecast, Early-Warning and Assessment, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    4Shenyang Regional Climate Center, Shenyang 110016, China;
    5Shaanxi Meteorological Service Observatory for Economic Crops, Xi'an 710015, China;
    6Yuncheng Meteorological Service, Yuncheng 044000, Shanxi, China
  • Received:2020-05-31 Accepted:2020-07-24 Online:2020-10-15 Published:2021-04-15
  • Contact: * E-mail: huozg@cma.gov.cn
  • Supported by:
    National Key R&D Program of China (2017YFC1502801).

Abstract: Based on data of daily precipitation, temperature, sunshine hours, relative humidity, wind speed and vapor pressure of 70 meteorological stations from 1960 to 2019 in Shanxi Province, the Penman-Monteith model was applied to calculate the reference evapotranspiration (ET0). The spatiotemporal variations of ET0 as well as the ET0 in different climatic zones and at different altitudes were quantitatively analyzed. The results showed that the mean annual ET0 decreased from west to east in 1960-2019. A jumping point was detected in 1982, with the mean annual ET0 increased both in 1960-1982 and 1983-2019. The monthly and ten-day changes of ET0 showed single peak curves. The variation of ET0 in different climatic zones was as follows: ET0 in temperate and semi-arid areas was higher than that in warm temperate and semi-humid areas and warm temperate and semi-arid areas in spring, summer, autumn and the whole year, while in winter, the highest ET0 was in warm temperate and semi-humid areas. ET0 varied with altitudes, with ET0 in <660 m altitude areas being higher than that in other altitudes in summer, autumn, winter and the whole year.

Key words: reference evapotranspiration, climatic zone, altitude, Shanxi Province