Simulating CH4 Concentrations in CMAQ v5.0

CMAQ
1

Hi CMAS users,

I am currently using the CMAQ v5.0 adjoint model and would like to simulate CH4 concentrations.
In CMAQ v5.3.2, CH₄ concentrations are computed as the ECH4 variable in the CONC file.
However, in CMAQ v5.0 (CB5cl_AE5 mechanism), I cannot find any variables related to CH4 concentrations.
Could you kindly provide any suggestions or solutions to address this issue?

My CONC file variables are listed below:

A25J, AACD, AALKJ, ABNZ1J, ABNZ2J, ABNZ3J, ACLI, ACLJ, ACLK, ACORS, AECI, AECJ, AH2OI, AH2OJ, AH2OK, AISO1J, AISO2J, AISO3J, ALD2, ALDX, ANAJ, ANAK, ANH4I, ANH4J, ANH4K, ANO3I, ANO3J, ANO3K, AOLGAJ, AOLGBJ, AORGCJ, AORGPAI, AORGPAJ, ASO4I, ASO4J, ASO4K, ASOIL, ASQTJ, ATOL1J, ATOL2J, ATOL3J, ATRP1J, ATRP2J, AXYL1J, AXYL2J, AXYL3J, BENZENE, BENZRO2, C2O3, CL, CL2, CLO, CO, CRES, CRO, CXO3, ETH, ETHA, ETOH, FACD, FMCL, FORM, H2O2, HCL, HCO3, HNO3, HO2, HOCL, HONO, IOLE, ISOP, ISPD, MEO2, MEOH, MEPX, MGLY, N2O5, NH3, NO, NO2, NO3, NTR, NUMACC, NUMATKN, NUMCOR, O, O1D, O3, OH, OLE, OPEN, PACD, PAN, PANX, PAR, PNA, ROOH, ROR, SESQ, SO2, SRFACC, SRFATKN, SRFCOR, SULF, SV_ALK, SV_BNZ1, SV_BNZ2, SV_ISO1, SV_ISO2, SV_SQT, SV_TOL1, SV_TOL2, SV_TRP1, SV_TRP2, SV_XYL1, SV_XYL2, TERP, TO2, TOL, TOLRO2, W_VEL, XO2, XO2N, XYL, XYLRO2

Thank you in advance for your assistance.

Best regards,
Jeonghyeok

2

As far as I know, greenhouse gas simulations are not supported by CMAQ at this time unless you treat them as tracer species (which actually not in the atmosphere). If you wish to model methane, you should try GEOS-Chem or WRF-GHG (with VPRM).