Rainfall Variability due to Climate Change

As for the cause of climate change, climate variability and parameter are often described and quantified by general circulation models (GCMs).The idea behind the evaluation of different climate change scenarios generated by the GCMs was to provide a wide range of scenarios for the next century built upon various detailed assumptions about non-climate factors such as global driving variables and emissions, other environmental factors and regional socio-economic factor which correspond to energy production and emission schemes. The most comprehensive emissions scenarios currently available are those from the IPCC Special Report on Emissions Scenarios (SRES), which detail emissions of carbon dioxide (CO 2 ), as well as other atmospheric constituents not accounted for by previous emissions scenarios (IPCC, 2000).
Rainfall is often governed by synoptic atmospheric patterns. Therefore, downscaling methods is widely used to evaluate the relationship between atmospheric patterns and rainfall data.The downscaling methods is used to evaluate local effects of a global climate change.