Uncertainties in regional climate change projections: Part I: Choice of global climate models for regional downscaling

Abstract

One of the main goals of the ClimaRice II project is to reduce uncertainties in future monsoon projections. The IPRC regional climate model (IPRC_RegCM) has been used to simulate the current and future climates over both Cauvery and Krishna basins. This technical brief summarizes the issues in setting up of a regional climate model such as spin-up time, required climate parameters, selection of model domain and resolution and issues related to lateral boundary conditions. The brief also summarizes the comparison of uncertainties involved in the global climate model and how this will influence the southwest and northeast monsoon seasons over the Indian region. The next brief will investigate the uncertainties in the IPRC_RegCM simulations, particularly over the Cauvery and Krishna basins.