Hanan Abdo(1)*and Michael Skaf(1)
(1) Department of forestry and environment, Faculty of Agriculture, Tishreen University, Lattakia, Syria.
(*Corresponding author: Hanan Abdo. E-Mail: firstname.lastname@example.org)
Received: 7/07/2021 Accepted: 22/12/2021
Evapotranspiration is a major component of the water cycle and plays a key role in surface energy balance and has a significant agricultural and ecological implication. To evaluate temporal characteristic potential evapotranspiration, at annual and seasonal time scales in Alraqa station during the period 1975-2005, the enman-Monteith equation was applied to calculate monthly potential evapotranspiration (ETP) using meteorological data which include meaning maximum and minimum temperatures, relative humidity, winds speed, and sunlight duration. Trends with Mann – the Kendall test and point change analysis were used to detect significant changes in annual and seasonal ETP. The results showed a significant decreasing tendency in annual ETP related to decreasing ETP in all seasons, especially in summer. Annual values of ETP were Shifted during two periods: 1984-1985 and 1990-1991. This decreasing trend in ETP resulted from westerly wind direction especially in warm months, which promotes increasing relative humidity in this region, owing to the location of Al Asad lake near this region
Keywords: Potential evapotranspiration, Climate change, Penman, Monteith, Syria.
Full paper in Arabic: pdf