ERROR: CO2 has exceeded the limit

A

anushree

Member
Hi Mike,
I have given a hybrid simulation for the year 2095 with the F compset
SSP585_CAM60%WCTS_CLM50%BGC-CROP_CICE%PRES_DOCN%DOM_MOSART_CISM2%NOEVOLVE_SWAV
using the restarts from :
b.e21.BWSSP585cmip6.f09_g17.CMIP6-SSP5-8.5-WACCM.002

but i am getting an error in the cesm.log file-
Opened existing file
/home/cas/faculty/dilipganguly/cesm/inputdata/atm/waccm/geomag/igrf_ceofs_c160412.nc 7274496

nlte_fomichev_calc: CO2 has exceeded the limit: nstep,i,k,press(Pa),lon,lat,vco

nlte_fomichev_calc: CO2 has exceeded the limit: nstep,i,k,press(Pa),lon,lat,vco

2(vmr)= 0 1 27 95.59 296.25 -80.58 0.1024E-02

I have attached all the files required.Kindly help me out with this error.
i am unable to compress the cesm.log file which is 200mb.The max i could compress it was of 6mb.
Regards,
Anushree
 

Attachments

mmills

mmills

CSEG and Liaisons
Staff member
This is normal model behavior for conditions with greater than 720 ppmv of CO2. The solution is to put this in your user_nl_cam:

nlte_limit_co2 = .true.

If TRUE apply upper limit to CO2 concentrations passed to the Formichev non-LTE cooling calculation (code not intended for values greater than 720 ppmv). Running with flag set to TRUE could lead to incorrect cooling rates if model CO2 exceeds 720 ppmv. If FALSE simulation will abort if CO2 levels exceed this value at altitudes above 1 mbar. The 720 ppmv CO2 limiter in the Formichev non-LTE cooling scheme is applied to all vertical levels regardless of this setting. Default: FALSE

As described above, this will allow the model to run with CO2 levels limited to 720 ppmv in the Formichev non-LTE cooling calculation. We require this to be done so that users are aware that they are running at conditions beyond the limits of this Formichev non-LTE cooling calculation, and that cooling rates in the upper atmosphere may be incorrect.

This is set to true by default in compsets that normally have CO2 levels greater than 720 ppmv, such as BW1PCT, BWCO2x4, and many of the SSP compsets.

CESM2 CAM6.3 Namelist Definitions

Namelist definitions for CAM6.3 in CESM2
www.cesm.ucar.edu www.cesm.ucar.edu
 
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