All about preindustrial runs

Name of the simulation: piC.map4.ipsl, meaning "preindustrial run, with adjustment of emissions of 4 TgN₂O/yr, with natural emissions from IPSL models".

UPDATE: This simulation seems to be wrong due to some boundaries conditions in lmdz.card.

Set in lmdz.card:

• configType = annual (rather than preind)
• files CO2.txt, N2O.txt, CFC11.txt, CFC12.txt and CH4.txt present so it reads values on them (and not fixed to preindustrial values)
• solaire parameter fixed to 0.0 (no right defaut value in config.def_*)

Set in orchidee.card:

• file CO2.txt so lmdz reads concentration value on it (rather than fixed preindustrial value)

ETADPU

Initial State

Which files are used? and where do they come from?

Inputs

• /ccc/store/cont003/gen2201/laurentk/sflx_outputs_N2O/sflx_lmdz_NAT_esm_phy_ipslymonmean.nc: natural land and ocean emissions, from Orchidee and Nemo/Pisces? models, transformed with IncaFlx?.
• /ccc/scratch/cont003/gen2201/laurentk/sflx_outputs_N2O/BBG/sflx_lmdz_BBG_1850_phy.nc: biomass burning emissions, from CEDS inventory, transformed with IncaFlx?.
• /ccc/scratch/cont003/gen2201/laurentk/sflx_outputs_N2O/ANT/sflx_lmdz_ANT_1850_phy.nc: anthropogenic emissions, reconstructed with CEDS inventory, transformed with IncaFlx?.
• /ccc/scratch/cont003/gen2201/laurentk/OXIDANTS/CM5A2CHT1-VLR-hist-02_1850_regrid79_bis.nc: oxidant from a CMIP6 simulation, transformed with Boucher's script.

Continent

• From Orchidee v3 model.
• Named fN2O
• mean of the 20 first years of the file.
• Output of IncaFlx? on obelix.

Ocean

• From Nemo/Pisces? v3.6
• spin-up named spinup.piscesOFFLINE
• mean of the 60 last years, ended in 1834 while run starts in 1660.
• Output of IncaFlx? on obelix.

Comparison to CNRM file (named N2Oflx_OClim_1850_2014.nc) Only 12 values each (one per month)

N2Oflx (TgN2O/yr)	CNRM	IPSL
jan	3.76	3.78
ave	3.76	4.00

Oxidants

• reconstructed from CMIP6 simulation and script of O. Boucher

Restart

• Overrule yes
• taken from fbbg.321ppb, year 1900 (it's a simulation which has run 50 years).
• rescaling made with NCO commands to rescale from 320.4 to 263.718 ppb. This value corresponds to the average atmospheric concentration of the run fbbg.321ppb, year 1900 and the target value of preindustrial era (273ppb at the surface, then 273*0.966 for the average concentration).

Computation

• Inputs emissions (values from sflx_lmdz_*_phy.nc different than emin2o from Output/MO/*_inca_ges.nc)

	nat+ant+bbg
jan	18.577
fev	17.423
mar	15.654
avr	14.965
mai	17.723
juin	23.431
juil	28.111
aout	27.421
sept	22.785
oct	18.707
nov	17.392
dec	18.007
mean	20.016
emin2o	19.964

after emissions adjustment (in TgN2O/yr):

daily	monthly
15,867	15,867 via mois par mois
	15,8467 just mean

• Box model

emissions cibles (TgN2O/yr) : 15,87

concentration cible (ppb) : 273,02

Only ocean