Resolution Dependence of Regional Hydro-Climatic Projection: A Case-Study for the Johor River Basin, Malaysia

Article


Tan, Mou Leong, Liang, Ju, Hawcroft, Matthew, Haywood, James M., Zhang, Fei, Rainis, Ruslan and Ismail, Wan Ruslan. 2021. "Resolution Dependence of Regional Hydro-Climatic Projection: A Case-Study for the Johor River Basin, Malaysia." Water. 13 (22). https://doi.org/10.3390/w13223158
Article Title

Resolution Dependence of Regional Hydro-Climatic Projection: A Case-Study for the Johor River Basin, Malaysia

Article CategoryArticle
AuthorsTan, Mou Leong, Liang, Ju, Hawcroft, Matthew, Haywood, James M., Zhang, Fei, Rainis, Ruslan and Ismail, Wan Ruslan
Journal TitleWater
Journal Citation13 (22)
Article Number3158
Number of Pages17
Year2021
PublisherMDPI AG
Place of PublicationSwitzerland
ISSN2073-4441
Digital Object Identifier (DOI)https://doi.org/10.3390/w13223158
Web Address (URL)https://www.mdpi.com/2073-4441/13/22/3158
Abstract

High resolution models from the High-Resolution Model Intercomparison Project (High-ResMIP), part of CMIP6, have the capacity to allow a better representation of the climate system in tropical regions, but how different model resolutions affect hydrological outputs remains unclear. This research aims to evaluate projections of hydro-climatic change of the Johor River Basin (JRB) in southern Peninsular Malaysia between 1985 to 2015 and 2021 to 2050, focusing on uncertainty quantification of hydrological outputs from low (>1◦), medium (0.5◦ to 1◦) and high (≤0.5◦) horizontal resolution models. These projections show future increases in annual precipitation of 0.4 to 3.1%, minimum and maximum temperature increases of 0.8 to 0.9◦ C and 0.9 to 1.1◦ C, respectively. These projected climate changes lead to increases in annual mean streamflow of 0.9% to 7.0% and surface runoff of 7.0% to 20.6% in the JRB. These annual mean changes are consistent with those during the wet period (November to December), e.g., streamflow increases of 4.9% to 10.8% and surface runoff of 28.8 to 39.9% in December. Disagreement in the direction of change is found during the dry seasons, (February to March and May to September), where high resolution models project a decrease in future monthly precipitation and streamflow, whilst increases are projected by the medium-and low-resolution models.

KeywordsClimate change; CMIP6; HighResMIP; SWAT; water resource; resolution; Malaysia; Johor
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020370202. Climatology
Byline AffiliationsUniversity of Science, Malaysia
University of Exeter, United Kingdom
Centre for Applied Climate Sciences
Met Office, United Kingdom
Xinjiang University, China
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