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Sensitivity analysis of a FAO Penman Monteith for potential evapotranspiration to climate change

Ahmad, Nor Farah Atiqah and Askari, Muhamad and Haruna, Sobri and Fadhil, Abu Bakar and Demun, Amat Sairin (2017) Sensitivity analysis of a FAO Penman Monteith for potential evapotranspiration to climate change. Jurnal Teknologi (Sciences & Engineering), 79 (7). pp. 21-30. ISSN 21803722

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Abstract

Sensitivity of the FAO Penman-Monteith (FPM) potential evapotranspiration (PET) model under tropical climates has been studied in the present study. A total of 17 meteorological stations covering Peninsular Malaysia starting from 1987-2003 were used as model inputs. A sensitivity analysis (SA) was carried out using the graphical method for temperature, wind speed and solar radiation within the possible range of ±20% with increments of 5%. From the comparison done on the sensitivity of PET to climatic change, the Kuala Krai station gave the highest percentage change in terms of temperature (±6%). The highest percentage change for wind speed (±2%) and solar radiation (±17%) were shown at the Alor Setar and Kuala Krai stations, respectively. The Alor Setar station had the lowest percentage change for temperature (±0.3%) and solar radiation (±9.9). The lowest percentage change of wind speed (± 0.2%) was observed at the Kuala Krai station. PET percentage changes have a positive correlation to the percentage change of all climatic variables except for the Cameron Highlands station. Results revealed that solar radiation has the most significant effect on PET (±14%), followed by temperature (±4%) and wind speed (±1%). Taken together, these results suggest that solar radiation plays an important role in estimating PET in Peninsular Malaysia.

Item Type: Article
Uncontrolled Keywords: Potential evapotranspiration; sensitivity analysis; FAO Penman-Monteith; meteorological parameters; climate change
Subjects: Q Science > QC Physics
Divisions: Centre of Diploma Studies > Department of Civil Engineering
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 13 May 2019 01:08
Last Modified: 13 May 2019 01:08
URI: http://eprints.uthm.edu.my/id/eprint/11085
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