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Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia


Citation

Siang, Cheah See and Teh, Christopher Boon Sung and Ismail, Mohd Razi and Yusop, Mohd Rafii (2020) Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia. Journal of Oil Palm Research, 32 (1). 34 - 49. ISSN 1511-2780

Abstract

Hourly values of air temperature, relative humidity and solar irradiance are often not available in most of the oil palm growing areas in Malaysia, thus limiting research in studying how these weather variables affect oil palm growth and yield. Therefore, a study was carried out to determine the accuracy of some selected models to estimate hourly values of these weather variables in six major oil palm growing areas in Malaysia. Using daily maximum and minimum temperatures, hourly air temperature was estimated. Together with mean hourly dew point temperature, the estimated hourly air temperature was used to simulate hourly relative humidity which was subsequently used to estimate hourly total solar irradiance. The mean absolute error, root mean square error and Willmott’s index of agreement within a 24-hr period for air temperature ranged from 0.5°C-0.7°C, 0.6°C-1.0°C and 0.81-0.84, respectively; for relative humidity ranged from 0.8%-1.5%, 1.0%-2.0% and 0.88-0.93, respectively and for total solar irradiance ranged from 83-139 W m-2, 109-178 W m-2 and 0.66-0.75, respectively. These models thus could be used to simulate hourly air temperature, relative humidity and solar irradiance in the six major oil palm growing areas in Malaysia.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Institute of Tropical Agriculture and Food Security
DOI Number: https://doi.org/10.21894/jopr.2020.0010
Publisher: Malaysian Palm Oil Board
Keywords: Modelling; Oil palm; Weather variables
Depositing User: Mohamad Jefri Mohamed Fauzi
Date Deposited: 16 Nov 2021 06:41
Last Modified: 16 Nov 2021 06:41
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.21894/jopr.2020.0010
URI: http://psasir.upm.edu.my/id/eprint/86788
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