Meteorological Influences on Reference Evapotranspiration in Different Geographical Regions

It is critical to understand how meteorological variables impact reference evapotranspiration (ETo) since have a different effect on ETo. This study examined the of ETo Korean Peninsula under complex climatic and geographic conditions in order changed over past 42 years. Different geographical were analyzed, including plains, mountains, coastal areas seasonal annual basis. was estimated using Penman-Monteith method by Food Agriculture Organization (FAO) daily relative humidity (RH), solar radiation (Rs), maximum temperature (Tmax), minimum (Tmin), wind speed (Ws). According results, mean occurred southern coast, while mountainous area along east coast. Seasonal highest summer, lowest winter for all regions. The investigation revealed that response varied area, magnitudes sensitivity location season. RH most variable affect seasons, except when Tmin sensitive parameter. results regions showed responses change changing variables. Meteorological affecting differ with geologic seasons. almost similar RH, Rs, Tmax (±10% ETo) during spring However, other regions, caused changes throughout, ranging from −15% +20% plain −20% +15% west +10% south In addition, there significant differences parameter between which confirmed results.