Application of MCDM Techniques in Ranking of CMIP6 GCMs for Extreme Temperatures over the Periyar River Basin
DOI:
https://doi.org/10.54386/jam.v28i3.3405Keywords:
Extreme Temperatures, Periyar River Basin, Ranking, TOPSIS, Compromise Programming, GDMAAbstract
Climatic extremes like temperature extremes are susceptible to climate change (CLC) warming impacts. Thus, it is essential to study the effect of CLC on extreme temperatures (minimum temperature, i.e., Tmin and maximum temperature, i.e., Tmax) of the Periyar River Basin (PRB), which has several human-induced constraints. Choosing the best general circulation models (GCMs) from a set through ranking is needed for precise projections of future climatic variables. None of the reviewed studies has executed GCMs ranking for 6th phase of Coupled Model Intercomparison Project (CMIP6) corresponding to extreme temperatures of the PRB. Thus, in the current study, ranking of 27 CMIP6 GCMs is performed for extreme temperatures at every grid point of the PRB by using four performance indicators, entropy method and Compromise Programming (CP) and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS). The aggregated ranking of GCMs corresponding to the whole study area for extreme temperatures is also executed by employing the Group Decision-Making Approach (GDMA). Top six ranked GCMs obtained through GDMA for Tmax are FGOALS-g3, BCC-CSM2-MR, CanESM5, GFDL-CM4-gr2, GISS-E2-1- G and CNRM-CM6-1 corresponding to TOPSIS and CP techniques while that for Tmin are KIOST-ESM, CanESM5, CNRM-CM6-1, INM-CM5-0, INM-CM4-8 and GISS-E2-1-G.
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