Abstract
Multimodel assembling methods have been commonly used to improve the reliability of climate projections by extracting relevant information from a large future possible climate scenarios. In this aspect, this study adopted the Reliability Ensemble Averaging (REA) approach to combine the precipitation outputs of multiple climate models over South Korea. The quality of REA weights assigned to each climate model was investigated using the Taylor diagram; both of these approaches showed a similar weight assignation mechanism. Furthermore, the REA performance was evaluated with the bias and root mean square error in view of reproducing the historical climate characteristics over the study region; both performance indices revealed that the REA substantially improved the performances of individual climate models at all weather stations. The analysis also showed that the climate models performance was not consistent in reproducing the precipitation characteristics over different seasons in South Korea. Thus, this study used the seasonal REA weights of each climate model for the precipitation projection. There is a general consensus between the individual climate simulators on the increasing trend of the projected precipitation in 2070–2099, except for a slight decreasing trend observed with IPSL-CM5A-LR over some parts of the central region. In general, the projected precipitation obtained with the REA over South Korea will vary between 5.23 and 10.78% for 2070–2100 relative to 1976–2005. The maximum and minimum projected precipitation increases were observed over the western and eastern parts of South Korea, respectively.
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Acknowledgements
The author greatly acknowledge the climate modeling groups listed in Table 1 for producing their climate model output. The recorded precipitation data from 60 weather stations over South Korea were retrieved from the Korea Meteorological Administration (https://www.kma.go.kr/).
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GT worked on the data analysis, conceptualization, formal analysis, investigation, methodology, software, and writing—original draft. AMM worked on investigation and review and editing. All authors read and approved the final manuscript.
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Tegegne, G., Mellesse, A.M. Multimodel ensemble projection of precipitation over South Korea using the reliability ensemble averaging. Theor Appl Climatol 151, 1205–1214 (2023). https://doi.org/10.1007/s00704-022-04350-8
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DOI: https://doi.org/10.1007/s00704-022-04350-8