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Explanations of output diagnostic variables

A list of possible history file variables can be found here: CAM-chem History Fields

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. You can find the possible history fields for your own specific model build by looking in a log file for your setup simulation and searching for "MASTER FIELD LIST".

Output variableUnitsDefinition
SF_<species>kg/m2/sEmissions of species (Surface Flux)
MEG_<species>kg/m2/sBiogenic emissions calculated by MEGAN in CLM
LNO_PRODmolecules /cm3/s3D lightning NO emissions
LNO_COL_PRODTg-N/yrvertically integrated lightning NO emissions
DV_<species>cm/s

Dry Deposition Velocity of species

DF_<species>kg/m2/sDry Deposition Flux of species
DTWR_<species>kg/kg/sWashout Rate of species (3D field)
WD_<species>kg/m2/sWet Deposition vertically integrated flux. Note: prior to CESM2 this was output in units (kg/grid-box/s).

<species>_CHMP

<species>_CHML

molecules /cm3/sTotal chemical production and loss for species (based on equations found in $CASE/CaseDocs/chem_mech.doc).  

O3_Prod

O3_Loss

molecules /cm3/s

For ozone, the gross production and loss terms (CHMP, CHML) are not particularly useful as they include the fast cycling reactions, so O3_Prod and O3_Loss are defined to represent the sum of the rate-limiting reactions of the OddOx family (O3 + O + O1D + NO2).  These are the key terms in the OddOx equations. In hindsight, these O3_Prod and O3_Loss names probably should not have the name O3_ in them. These reactions are aimed primarily at deriving the tropospheric photochemical smog chemistry. The main reactions are:

O3_Prod = NO_HO2 + CH3O2_NO + PO2_NO + CH3CO3_NO + C2H5O2_NO + .92*ISOPAO2_NO + .92*ISOPBO2_NO + MACRO2_NOa + MCO3_NO + C3H7O2_NO + RO2_NO + XO2_NO + .9*TOLO2_NO + .9*PHENO2_NO + .9*C6H5O2_NO + .9*BENZO2_NO + .9*MALO2_NO + .9*BZOO_NO + .9*ACBZO2_NO + .9*DICARBO2_NO + .9*MDIALO2_NO  + .9*XYLOLO2_NO + .9*XYLENO2_NO + TERPO2_NO + TERP2O2_NO + NTERPO2_NO + ALKO2_NO + ENEO2_NO +  EO2_NO + MEKO2_NO + HOCH2OO_NO + jonitr

O3_Loss = O1D_H2O + OH_O3 + HO2_O3 + H_O3 + C3H6_O3 + .9*ISOP_O3 + C2H4_O3 + .8*MVK_O3 + 0.8*MACR_O3 + MTERP_O3 + BCARY_O3

These diagnostic terms are now (CESM2) defined in the atm_in namelist (the rxn_rate_sums variable in the rxn_rates_diag_nl group).  These rate sums can be modified, or additional ones created, by the user in user_nl_cam.  

j<photorate_label>/sPhotolysis rate constant
r_j<photorate_label>molecules /cm3/sPhotolysis rate (j * species density)
<rxnrate_label>
Reaction rate constant (e.g., "O1D_H2O" gives k for O1D+H2O)
r_<rxnrate_label>molecules /cm3/sReaction rate (k * [O1D] * [H2O] )

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