This emulation tool provides statistical representations of the behavior of a number of general circulation models (GCMs) from different research groups. The emulator is designed to mimic how the larger models would have responded, and can provide projections of regional temperatures for any user-chosen scenario of future CO2 concentrations.

The emulator is ‘trained’ on publicly-available model simulations of scenarios specified for the IPCC 5th Assessment Report. Users can explore emulated model responses to four IPCC scenarios (RCPs 2.6, 4.5, and 8.5) and one scenario of continuous exponential growth in CO2, or can upload their own CO2 scenarios. Click any of the ‘trajectory’ boxes or drag and drop a CO2 file in the ‘custom’ window. (See documentation for instructions and further information.)

This site is currently in beta, and some older browser versions may not support all emulator functions. The site works best in Chrome, and Javascript must be enabled.

CO2 Trajectory (ppm)

Drop your custom CO2 data here. [help]


Projected Temperature Change (°C)  relative  |  absolute  ] CSV  ] AJAX loader

Available climate models Compare regional data within a model  |  Compare global means among all models  ]

Select regions to compare

"CO2 scenarios should be uploaded as comma-separated (csv) text files, containing annual CO2 concentrations in parts per million (ppm) units. The file can contain any number of years, but plots will show only through 2100. If fewer than 96 years are listed, the scenario will be extrapolated to 2100. See documentation page for further information”