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

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 acc...

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Main Authors: Siang, Cheah See, Teh, Christopher Boon Sung, Ismail, Mohd Razi, Yusop, Mohd Rafii
Format: Article
Language:English
Published: Malaysian Palm Oil Board 2020
Online Access:http://psasir.upm.edu.my/id/eprint/86788/1/Modelling%20hourly%20air%20temperature.pdf
http://psasir.upm.edu.my/id/eprint/86788/
http://jopr.mpob.gov.my/V2/?p=9835
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spelling my.upm.eprints.867882021-11-16T06:41:31Z http://psasir.upm.edu.my/id/eprint/86788/ Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia Siang, Cheah See Teh, Christopher Boon Sung Ismail, Mohd Razi Yusop, Mohd Rafii 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. Malaysian Palm Oil Board 2020-03 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/86788/1/Modelling%20hourly%20air%20temperature.pdf 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 http://jopr.mpob.gov.my/V2/?p=9835 10.21894/jopr.2020.0010
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description 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.
format Article
author Siang, Cheah See
Teh, Christopher Boon Sung
Ismail, Mohd Razi
Yusop, Mohd Rafii
spellingShingle Siang, Cheah See
Teh, Christopher Boon Sung
Ismail, Mohd Razi
Yusop, Mohd Rafii
Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
author_facet Siang, Cheah See
Teh, Christopher Boon Sung
Ismail, Mohd Razi
Yusop, Mohd Rafii
author_sort Siang, Cheah See
title Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
title_short Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
title_full Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
title_fullStr Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
title_full_unstemmed Modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in Malaysia
title_sort modelling hourly air temperature, relative humidity and solar irradiance over several major oil palm growing areas in malaysia
publisher Malaysian Palm Oil Board
publishDate 2020
url http://psasir.upm.edu.my/id/eprint/86788/1/Modelling%20hourly%20air%20temperature.pdf
http://psasir.upm.edu.my/id/eprint/86788/
http://jopr.mpob.gov.my/V2/?p=9835
_version_ 1717095390454480896
score 13.211869

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