VDEMIS, species map

CMAQ Chemistry and Aerosols
1

Hi All,

I am trying to perform some sensitivities using the CMAQ by perturbing the emissions. It seems like that VDEMIS variable is the best target to do so. But, I am wondering what species this variable refers to? It sounds like it starts with N_GC (global compounds?). But I am not sure what exactly they are.

Thanks!

Amir

2

If you are using a recent version of CMAQ (v5.0-5.2), you could perturb emissions through the namelist (via changing the EMIS_FAC value) or by preprocessing your emission files with combine (https://github.com/USEPA/CMAQ/tree/5.2.1/POST/combine). The combine approach will be a little more transparent in terms of what is modified, but will require storage of additional inputs.

In CMAQ v5.3, this type of task will be even easier with an emission control file.

1 Like
3

Thanks Havala for your answer!

I am glad that EPA is going to include an emission control file.

I dig into CMAQ scripts (opconc.F), and I found that VDEMIS is in this order for the CB05/AERO6 mechanism:

1 (  1) NO2
    2 (  2) NO
    3 (  3) O
    4 (  4) O3
    5 (  5) NO3
    6 (  6) O1D
    7 (  7) OH
    8 (  8) HO2
    9 (  9) N2O5
   10 ( 10) HNO3
   11 ( 11) HONO
   12 ( 12) PNA
   13 ( 13) H2O2
   14 ( 14) XO2
   15 ( 15) XO2N
   16 ( 16) NTR
   17 ( 17) ROOH
   18 ( 18) FORM
   19 ( 19) ALD2
   20 ( 20) ALDX
   21 ( 21) PAR
   22 ( 22) CO
   23 ( 23) MEO2
   24 ( 24) MEPX
   25 ( 25) MEOH
   26 ( 26) HCO3
   27 ( 27) FACD
   28 ( 28) C2O3
   29 ( 29) PAN
   30 ( 30) PACD
   31 ( 31) AACD
   32 ( 32) CXO3
   33 ( 33) PANX
   34 ( 34) ROR
   35 ( 35) OLE
   36 ( 36) ETH
   37 ( 37) IOLE
   38 ( 38) TOL
   39 ( 39) CRES
   40 ( 40) TO2
   41 ( 41) TOLRO2
   42 ( 42) OPEN
   43 ( 43) MGLY
   44 ( 44) CRO
   45 ( 45) CAT1
   46 ( 46) CRON
   47 ( 47) CRNO
   48 ( 48) CRN2
   49 ( 49) CRPX
   50 ( 50) OPO3
   51 ( 51) CAO2
   52 ( 52) OPAN
   53 ( 53) XYLMN
   54 ( 54) XYLRO2
   55 ( 55) NAPH
   56 ( 56) PAHRO2
   57 ( 57) ISOP
   58 ( 58) ISPD
   59 ( 59) TERP
   60 ( 60) SO2
   61 ( 61) SULF
   62 ( 62) ETOH
   63 ( 63) ETHA
   64 ( 64) CL2
   65 ( 65) CL
   66 ( 66) HOCL
   67 ( 67) CLO
   68 ( 68) FMCL
   69 ( 69) HCL
   70 ( 70) CLNO2
   71 ( 71) BENZENE
   72 ( 72) BENZRO2
   73 ( 73) SESQ
   74 ( 74) SOAALK
   75 ( 75) H2NO3PIJ
   76 ( 76) H2NO3PK
   77 ( 77) VLVPO1
   78 ( 78) VSVPO1
   79 ( 79) VSVPO2
   80 ( 80) VSVPO3
   81 ( 81) VIVPO1
   82 ( 82) VLVOO1
   83 ( 83) VLVOO2
   84 ( 84) VSVOO1
   85 ( 85) VSVOO2
   86 ( 86) VSVOO3
   87 ( 87) PCVOC

Amir