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Bias Correction and Trend Analysis of Temperature Data by a High-Resolution CMIP6 Model over a Tropical River Basin

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Abstract

Technological advancements like increase in computational power have led to high-resolution simulations of climate variables by Global Climate Models (GCMs). However, significant biases exist in GCM outputs when considered at a regional scale. Hence, bias correction has to be done before using GCM outputs for impact studies at a local/regional scale. Six bias correction methods, namely, delta change (DC) method, linear scaling (LS), empirical quantile mapping (EQM), adjusted quantile mapping (AQM), Gamma-Pareto quantile mapping (GPQM) and quantile delta mapping (QDM) were used to bias correct the high-resolution daily maximum and minimum temperature simulations by Meteorological Research Institute-Atmospheric General Circulation Model Version 3.2 (MRI-AGCM3–2-S) model which is part of Coupled Model Intercomparison Project Phase 6 (CMIP6), of Netravati basin, a tropical river basin on the south-west coast of India. The quantile-quantile (Q–Q) plots and Taylor diagrams along with performance indicators like Nash–Sutcliffe efficiency (NSE), the Root-Mean Square Error (RMSE) or Root-Mean Square Deviation (RMSD), the Mean Absolute Error (MAE), the Percentage BIAS (PBIAS) and the correlation coefficient (r) were used for the evaluation of the performance of each bias correction method in the validation period. Considerable reduction in the bias was observed for all the bias correction methods employed except for the LS method. The results of QDM method, which is a trend preserving bias correction method, was used for analysing the trend of future temperature data. The trend of historical and future temperature data revealed an increasing trend in the annual temperature. An increase of 0.051 °C and 0.046 °C is expected for maximum and minimum temperature annually during the period 2015 to 2050 as per RCP 8.5 scenario. This study demonstrates that the application of a suitable bias correction is needed before using GCM projections for climate change studies.

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Acknowledgements

We acknowledge the India Meteorological Department (IMD) for providing daily gridded maximum and minimum temperature data. Further, we acknowledge the World Climate Research Programme, which, through its Working Group on Coupled Modelling, coordinated and promoted CMIP6. We thank the climate modelling groups for producing and making available their model output, the Earth System Grid Federation (ESGF) for archiving the data and providing access, and the multiple funding agencies who support CMIP6 and ESGF. Authors would also like to thank the Department of Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Surathkal, India for providing the necessary support to carry out this research work. Last but not least, we thank the anonymous reviewers for their careful reading of our manuscript and their many insightful comments and suggestions.

Availability of Data and Material (Data Transparency)

The GCM data used is available online on the World Climate Research Programme (WCRP) climate data portal (https://esgf-node.llnl.gov/search/cmip6/). The gridded maximum and minimum temperature data can be accessed through IMD Pune’s website (http://www.imdpune.gov.in/Clim_Pred_LRF_New/Grided_Data_Download.html).

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Correspondence to Dinu Maria Jose.

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The authors declare that they have no conflicts of interest.

Code Availability

Author has used an open-source MATLAB toolbox developed by Santander Meteorology Group named MeteoLab Toolbox for performing the bias correction of temperature along with other customised codes. MATLAB is also used the generation of figures and change point analysis. Trend analysis was done using pyMannKendall package in python.

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Responsible Editor: Maeng-Ki Kim.

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Jose, D.M., Dwarakish, G.S. Bias Correction and Trend Analysis of Temperature Data by a High-Resolution CMIP6 Model over a Tropical River Basin. Asia-Pacific J Atmos Sci 58, 97–115 (2022). https://doi.org/10.1007/s13143-021-00240-7

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  • DOI: https://doi.org/10.1007/s13143-021-00240-7

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