Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1002/joc.7813
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Title (Primary) A multimodel ensemble machine learning approach for CMIP6 climate model projections in an Indian River basin
Author Dey, A.; Sahoo, D.P.; Kumar, R. ORCID logo ; Remesan, R.
Source Titel International Journal of Climatology
Year 2022
Department CHS
Volume 42
Issue 16
Page From 9215
Page To 9236
Language englisch
Topic T5 Future Landscapes
Keywords CMIP6 GCMs; machine learning; MME; random forest; SSP scenarios; support vector machine
Abstract Multimodel ensemble (MME) approach would help modellers to know the advantages of individual global circulation models (GCMs) and to avoid the weaknesses associated with them, and it would help the river basin modellers to make appropriate modelling decisions. The study highlights the river basin-scale development of MME as a convenient way to reduce the parameter and structural uncertainties in the Coupled Model Intercomparison Project Phase 6 (CMIP6) GCMs simulations after identifying the best five CMIP6 GCMs based on the rating metric calculations. Furthermore, the performance of the MME was enhanced by integrating three machine learning algorithms (artificial neural network [ANN], random forest [RF], support vector machine [SVM]). Subsequently, comparative assessment depicted the improved performance in MME-integrated ML algorithms compared to simple arithmetic mean (SAM) in simulating observed precipitation (P), maximum temperature (Tmax), and minimum temperature (Tmin) over the Damodar River basin (DRB), India. The statistical metrics indicate that the SVM and RF methods yielded better results than SAM and ANN methods, thus selected for future projections. The robustness of the MME-RF and MME-SVM approach has also been observed while capturing the spatial pattern as IMD-observed with well representation of climate indices for both wet and dry seasons. Future projections with MME-SVM and MME-RF suggested a possible rise in mean annual P in the range of 1.4–15% and 6.8–39% with an increasing trend in temperature (Tmax, Tmin) under the SSP245 and SSP585 scenarios, respectively. Replicating the spatial pattern of the future climatic variables projections evinced a warmer and drier climate in the southwest part of the DRB for both SSP scenarios during wet and dry season and thence warned a probable drier condition on the southwest part of the DRB in future time slices.
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Dey, A., Sahoo, D.P., Kumar, R., Remesan, R. (2022):
A multimodel ensemble machine learning approach for CMIP6 climate model projections in an Indian River basin
Int. J. Climatol. 42 (16), 9215 - 9236 10.1002/joc.7813