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Impacts of lateral boundary condition resolution in tropical urban climate modelling for Kuala Lumpur.

Isa, Nurul Amirah; Salleh, Siti Aekbal; Wan Mohd, Wan Mohd Naim; Ooi, Maggie Chel Gee; Chan, Andy; Islam, Md Amirul


Nurul Amirah Isa

Siti Aekbal Salleh

Wan Mohd Naim Wan Mohd

Maggie Chel Gee Ooi

Andy Chan

Md Amirul Islam


Choosing the best LBCs is still debated among researchers due to the errors resulted. However, several recommendations have been documented to control the errors propagated by LBCs. One of the recommendations is employing higher resolutions LBCs. In the present, many LBCs are developed with various resolutions; spatially and temporally, for many applications but no claims regarding the best LBCs for tropical climate modelling have yet been documented. Therefore, this study intends to analyse the impacts of lateral boundary condition resolution during numerical downscaling within a tropical city. This study serves as a site-specific investigation to determine the suitable LBCs for the focused study area. Two widely used LBCs with different resolutions were utilized to initiate the Weather Research and Forecasting (WRF) simulation model. The performances of the two LBCs were compared using statistical tests and analyses. The study has found that the LBC with higher resolutions excels the other LBC during inter-monsoon season. Nevertheless, it was identified that both LBCs were able to provide reliable reconstruction of the tropical climate condition of the Kuala Lumpur City as portrayed by similar results obtained. Thus, it is concluded that both LBCs can be employed in numerical downscaling for tropical urban regions similar to the Kuala Lumpur City.


ISA, N.A., SALLEH, S.A., WAN MOHD, W.M.N., OOI, M.C.G., CHAN, A. and ISLAM, M.A. 2021. Impacts of lateral boundary condition resolution in tropical urban climate modelling for Kuala Lumpur. Engineering journal [online], 25(1), pages 165-175. Available from:

Journal Article Type Article
Acceptance Date Nov 25, 2020
Online Publication Date Jan 31, 2021
Publication Date Jan 31, 2021
Deposit Date Jun 30, 2023
Publicly Available Date Jul 6, 2023
Journal Engineering journal
Electronic ISSN 0125-8281
Publisher Chulalongkorn University, Faculty of Engineering
Peer Reviewed Peer Reviewed
Volume 25
Issue 1
Pages 165-175
Keywords Lateral boundary condition; Resolution; WRF; Tropical urban; Kuala Lumpur
Public URL
Additional Information This article is based on the presentation at the 4th International conference on research methodology for built environment and engineering 2019 (ICRMBEE 2019), 24-25 April 2019, Bangkok, Thailand.


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