| Title: | Resolution dependence of regional hydro-climatic projection: A case-study for the Johor River Basin, Malaysia |
| Authors: | Tan, M.L., J. Liang, M. Hawcroft, J.M. Haywood, F. Zhang, R. Rainis and W.R. Ismail |
| Year: | 2021 |
| Journal: | Water |
| Volume (Issue): | 13(22) |
| Pages: | |
| Article ID: | 3158 |
| DOI: | 10.3390/w13223158 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | climate change |
| Secondary Application Category: | hydrologic assessment |
| Watershed Description: | 1644 km^2 Johor River, located in the southern part of Peninsular Malaysia. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| 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 deg), medium (0.5 deg to 1 deg) and high (<= 0.5 deg) 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 deg C and 0.9 to 1.1 deg 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. |
| Language: | English |
| Keywords: | climate change; CMIP6; HighResMIP; SWAT; water resource; resolution; Malaysia; Joho |