Scheduled Downtime
On Tuesday 24 October 2023 @ 5pm MT the forums will be in read only mode in preparation for the downtime. On Wednesday 25 October 2023 @ 5am MT, this website will be down for maintenance and expected to return online later in the morning.
Normal Operations
The forums are back online with normal operations. If you notice any issues or errors related to the forums, please reach out to help@ucar.edu

A basic change in CO2 concentrations... doesn't work

Hello,
I'm working with CESM for the first time, and i 'm using a local machine (configurated... it's ok)I want to do a simple change in CO2 concentration (4 times from the beginning), and my steps are these1) create new case2) setup3) ./xmlchange CCSM_CO2_PPMV=1440.0I read before (in tutorialS... from the CESM page, the manual, etc) that it's correct to do that, as well as change it in the user_cam_nl.Again, I don't want to make this change "RAMPED" in time. So, I won't make a change in the "scenario_ghg", because a prescribed concentration in 4 times is the purpose.4) change nyears, nstop, S_DOUT, etc5) ./preview_namelists6) build7) run My outputs are really strange, because I have proven more than 2 compset and i don't  see any differences in the Atmospheric Temperature (low levels) during 20 years.Am i making somthing wrong?
Are compsets F-AQUAP (with fixed SST in the AQUAPLANET) too slow to respond to 4xCO2 forcing?
I feel confused. the atm_in file says that co2_vmr = 1440.0e-6 Regards   
 

hannay

Cecile Hannay
AMWG Liaison
Staff member
If you are using a F compset, you have fixed SSTs. They won't change when you are doing 4xCO2.
 
Top