= IPSLCM6-AER Spin-up and initial states =



== 0. General table of restart files ==

Note about the years of finalnames. The year of final-name is selected according to the simulation to be run. In the case of historical 1850, in the case of abrupt4xCO2 is not important but it is 1869 to be consistent with IPSL simulations without aerosols. Note that the specific year is not critical for the idealized simulations. The important point is the consistency with external forcings. 

||='''Name  '''=||='''Parent Restart'''=||=''' Tracers from '''=||=''' Parent with tracers '''=||='''Years Spin-up'''=||='''Restart file after Spinup'''=||
|| historical   ||''piControl'': CM61-LR-pi-03_19091231_restart.nc || ATM_TEST-CM61-LR-pi-AER-tunning-LONG4_18551231_restart.nc ||CM61-LR-pi-03-AER-historical_19091231_restart.nc|| 5 years || CM61-LR-pi-03-AER-historical-spinup_18501231_restart.nc ||
|| abrupt4xCO2  ||''piControl'': CM61-LR-pi-03_18691231_restart.nc || ATM_TEST-CM61-LR-pi-AER-tunning-LONG4_18551231_restart.nc ||CM61-LR-pi-03-AER-abrupt4xCO2_18691231_restart.nc||5 years || CM61-LR-pi-03-AER-abrupt4xCO2-spinup_18691231_restart.nc ||


== 1. Steps to create the initial states ==

=== 1.1 Get the tracers (pre-industrial) ===

We used the simulation of equilibration validation: '''TEST-CM61-LR-pi-AER-tunning-LONG4'''
from the version code '''IPSLCM6.1.10'''. This simulation has been run for 90 years to test the equilibration and the tracers are taken from 1855.

{{{

cdo selvar,SSN,SSSSM,ASN,ASNO3M,ASMSAM,ASNH4M,ASSO4M,ASPOMM,ASBCM,ASSSM,CSN,CSNO3M,CSMSAM,CSNH4M,CSSO4M,CSSSM,AIN,AIPOMM,AIBCM,CIN,CINO3M,CIDUSTM,NH3,DMSO,DMS,H2S,SO2,N2O5,HNO3,NO3,NO2,Pb210,Rn222 ../restart_fr
om_TUNNING/ATM_TEST-CM61-LR-pi-AER-tunning-LONG4_18551231_restart.nc inca_tracers_18551231.nc

ncrename -d lev,sigs inca_tracers_18551231.nc 

}}}

=== 1.2 Add the tracers to restart file ===

Here we add the tracers to the case of abrupt4xCO2:

1. Copy the selected restart file from IPSLCM61-R: `cp CM61-LR-pi-03_18691231_restart.nc CM61-LR-pi-03-AER-abrupt4xCO2_18691231_restart.nc`
2. Add temps of this restart file to tracers: `ncks -A -v temps CM61-LR-pi-03_18691231_restart.nc inca_tracers_18551231.nc`
3. Add the tracers to the new restart file:
{{{
ncks -A -v SSN,SSSSM,ASN,ASNO3M,ASMSAM,ASNH4M,ASSO4M,ASPOMM,ASBCM,ASSSM,CSN,CSNO3M,CSMSAM,CSNH4M,CSSO4M,CSSSM,AIN,AIPOMM,AIBCM,CIN,CINO3M,CIDUSTM,NH3,DMSO,DMS,H2S,SO2,N2O5,HNO3,NO3,NO2,Pb210,Rn222 inca_tracers_
18551231.nc CM61-LR-pi-03-AER-abrupt4xCO2_18691231_restart.nc 
}}}


=== 1.3 Run a spinup of several years ===

Given the file named '''Parent with tracers''' in the table above we will run a number of years of spinup with the tracers to have the final parent-initial state. To ensure a reasonable restart file we have selected 10 years of spin-up for those large simulations (more than 100 years).