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

Cheah See Siang, . and Teh Christopher Boon Sung, . and Mohd Razi Ismail, . and Mohd Rafii Yusop, . Modelling hourly air temperature relative humidity and solar irradiance over several major oil palm growing areas in Malaysia. pp. 34-49. ISSN 1511-2780

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 Willmotts index of agreement within a 24-hr period for air temperature ranged from 0.5C-0.7C 0.6C-1.0C 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.

Full text available from: Official URL: http://jopr.mpob.gov.my/wp-content/uploads/2020/03...

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 Willmotts index of agreement within a 24-hr period for air temperature ranged from 0.5C-0.7C 0.6C-1.0C 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.

[error in script]

Item Type:	Article
AGROVOC Term:	Elaeis guineensis
AGROVOC Term:	Oil palm
AGROVOC Term:	Plant cultivation
AGROVOC Term:	Crop modelling
AGROVOC Term:	Weather conditions
AGROVOC Term:	Air temperature
AGROVOC Term:	Relative humidity
AGROVOC Term:	Solar radiation
AGROVOC Term:	Photosynthesis
AGROVOC Term:	Wind speed
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8962

Actions (login required)

View Item