AMIP like simulation before 1979

[farid_ait-chaalal@rms_com]

Hello, I have a quite general question. Is there an AMIP-like compset scientifically validated at a 0.9 degree horizontal resolution and that goes back before 1979. Thanks a lot,Farid

 

[hannay]

There is the compset: F_1850-2000_CAM5_CN that allows you to go back to 1850-2005F_1850-PDAY_CAM5 that allows you to run 1850-2012. This compset uses complete atmospheric forcing data from observed sources up to the year 2005. Following this period it is a combination of observed sources (SST, sea ice, CO2, CH4, N2O) to present day and IPCC RCP4.5 scenario data.   But they haven't been officially "scientifically validated"

 

[farid_ait-chaalal@rms_com]

Thank you very much hannay, that is very helpful. So:1. If I dug right into the documentation, F_1850-2000_CN is also available but uses CAM4 and there is no 1850-PDAY compset with CAM4 (would it work to configure one?) 2. What are the differences between F-1850-2000_CAM5_CN and F_AMIP_CAM5_CN in model configuration and forcings for the overlapping years?3. What is exactly a scientifically validated configuration (is there more info available than the first line on this page: http://www.cesm.ucar.edu/models/scientifically-supported.html)? Thanks,

 

[hannay]

The difference between F_1850-PDAY_CAM5  and F_AMIP_CAM5_CN is that the F_1850-PDAY_CAM5  compset uses complete atmospheric forcing data from observed sources up to the year 2005. Following this period it is a combination of observed sources (SST, sea ice, CO2, CH4, N2O) to present day and IPCC RCP4.5 scenario data.   They shoudl be teh same until 2005
Scientifically validated configuration means that we ran an experiment with that configuratoion we have looked at it extensively (and we did all the tuning).If not scientifically validated, the user is responsible to do a simulation and to check the climate is ok (and to do some tuning if needed).

 

[farid_ait-chaalal@rms_com]

Thanks hannay,Do you know if there is any way to run a F compset 1850-PDAY but using CAM4 and not CAM5?

 

[hannay]

As far as I know there is no compset with CAM4 that does this. Once again the workaround would be to use rcp files for after 2005