High resolution Regional Climate Downscaling
Sabin TP, Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India
This talk reviews the current state of the art methodologies involved in the regional climate downscaling which provides finer spatial and temporal information over the region of interest in a climate change perspective. Emphasis is given to recent advances in this field and the problems related to the practical application such as selection of appropriate models, boundary forcing which leads to the realistic representation of present and future climate simulation. This study further examines the feasibility of using a variable resolution global general circulation model, with telescopic zooming and enhanced resolution over South Asia, to better understand the regional aspects of the South Asian monsoon . Global atmospheric models with stretched grid can be used, in particular to downscale climate change projections on a given region by imposing radiative forcing such as greenhouse gas concentrations, aerosols and accounting for changes in sea surface temperature as predicted by a global coarser resolution atmosphere-ocean coupled model.
The World Climate Research Program of WMO is came up with a new framework for regional climate downscaling, called CORDEX, with the two-fold aim of developing a coordinated framework for evaluating and improving the regional climate downscaling techniques and producing a new generation of fine-scale climate projections for south Asia. Through this we will be able to provide climate data at relevant spatial and temporal scales for improved regional climate change adaptation and impact assessment studies.