Reference evapotranspiration estimates based on meteorological variables over Korean agro-climatic zones for rice field

다국어 초록 (Multilingual Abstract)

This study was conducted to estimate annual reference evapotranspiration (ET0) for the agro-climatic zones for rice paddy fields in South Korea between 1980 and 2015. The daily ET0 was estimated by applying the Penman-Monteith method to meteorological data from 61 weather stations provided by Korean Meteorological Administration (KMA). The average of annual ET0 from 1980 to 2015 was 1334.1±33.89 mm. The ET0 was the highest at the Southern Coastal Zone due to their higher air temperature and lower relative humidity. The ET0 had significantly increased with 2.81 mm/yr for the whole zones over 36 years. However, the change rate of it was different among agro-climatic zones. The annual ET0 highly increased in central zones and eastern coastal zones. In terms of correlation coefficient, the temporal change of the annual ET0 was closely related to variations of four meteorological factors (i.e., mean, minimum temperatures, sunshine duration, and relative humidity). The results demonstrated that whole Korean agro-climatic zones have been undergoing a significant change in the annual ET0 for the last 36 years. Understanding the spatial pattern and the long-term variation of the annual ET0 associated with global warming would be useful to improve crop and water resource managements at each agro-climatic zone of South Korea.

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