|TITLE||A REGIONAL CLIMATE MODEL VERSUS A SURFACE ENERGY BALANCE MODEL IN ESTIMATING EVAPOTRANSPIRATION UNDER WATER AND ENERGY-LIMITED CONDITIONS OF THE KONYA BASIN|
|AUTHORS||Mustafa Gökmen (1)|Baris Önol (2)|Ömer Lütfi Sen (3)|
- Ministry of Environment and Urbanization, Ankara, Turkey
- Department of Meteorological Engineering, Istanbul Technical University, Istanbul, Turkey
- Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey
|ABSTRACT||Evapotranspiration is a central process of a regional climate system because of its linking role between water and energy cycles. Hence, understanding the dynamics of the evapotranspiration and its accurate quantification are essential for improving the predictions about the impacts of climate change on the water resources.
This study presents the comparison of two different approaches for quantifying the spatiotemporal distribution of the evapotranspiration at the regional scale: the simulations by a regional climate model (i.e. ICTP-RegCM3), which is atmospherically oriented, versus the estimations by a surface energy balance model (i.e. SEBS), which is land surface oriented. The comparison was carried out in the Konya closed basin, whose limited water resources are under strong anthropogenic pressure due to the extensive and intensive agricultural activities. The climate of the basin varies from arid, terrestrial character in the inner plain parts (i.e. evapotranspiration is dominantly limited by water supply) to semi-arid Mediterranean character in the bordering Taurus Mountains in the southwest (i.e. evapotranspiration is dominantly limited by atmospheric demand). In this regard, the basin presents an ideal case for testing different methods in quantifying evapotranspiration under varying land surface and climate conditions. Our results show that while performing similarly in the energy-limited parts of the basin, the evapotranspiration estimations by the two methods can differ largely in the water-limited parts depending on the water-stress conditions.|