GEOS-Chem v10-01 Online User's Guide

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Appendix 1: GEOS-Chem Tracers, by Simulation

With GEOS-Chem, you can perform several different types of chemistry simulations. In this Appendix, we provide a list of advected tracers for each simulation.

A1.1 NOx-Ox-hydrocarbon-aerosol simulations

An advected tracer is a molecule that typically has a lifetime that is long enough so that it can be transported out of the grid box in which it was created. Many advected tracers are also listed as individual species in the chemical mechanism.

Please consult Appendix 6 for a complete list of chemical species in GEOS-Chem.

We specify several hydrocarbon tracers (those listed in BOLD ITALICS) as atoms C instead of molecules tracer. We assign to these a molecular weight of 12 g/mole. The number of moles C per moles tracer is listed below.

You can select from different chemistry mechanism options for the NOx-Ox-hydrocarbon-aerosol simulations. In the following table we give the tracers for each option:

  1. The NOx-Ox-HC-Aer-Br (aka "tropchem") mechanism (now including bromine chemistry, methyl peroxy nitrate chemistry, isoprene chemistry)
  2. The UCX mechanism
  3. The SOA mechanism (with optional semivolatile POA)
  4. The benchmark mechanism (= the UCX mechanism + the SOA mechanism). This mechanism will be selected by default when you run GEOS-Chem "out-of-the-box")

For more information about these simulations, please see:

  1. Chapter 6.1.1, Checklist for NOx–Ox–Hydrocarbon–aerosol chemistry simulation with SMVGEAR or KPP
  2. GEOS-Chem Wiki: Mechanisms in GEOS-Chem v10-01 and later versions
  3. GEOS-Chem Wiki: NOx-Ox-HC-Aer-Br chemistry mechanism
  4. GEOS-Chem Wiki: UCX chemistry mechanism
  5. GEOS-Chem Wiki: Secondary organic aerosols

The table below lists the species contained in each of these mechanisms. Color-coded numbers in the first 4 columns indicate the tracer number assigned to each species in each of the 4 mechanisms. Species listed in boldface are carried in equivalent carbons instead of molecules per species.

NOx
#		 UCX
#		 SOA
#		 BM
#		 Name Description g/mole mole C/
mole tracer
Standard mechanism
1 1 1 1 NO Nitric oxide 46 -
2 2 2 2 O3 Ozone 48 -
3 3 3 3 PAN Peroxyacetyl Nitrate 121 -
4 4 4 4 CO Carbon Monoxide 28 -
5 5 5 5 ALK4 Lumped >= C4 Alkanes 12 4
6 6 6 6 ISOP Isoprene 12 5
7 7 7 7 HNO3 Nitric Acid 63 -
8 8 8 8 H2O2 Hydrogen Peroxide 34 -
9 9 9 9 ACET Acetone 12 3
10 10 10 10 MEK Methyl Ethyl Ketone 12 4
11 11 11 11 ALD2 Acetaldehyde 12 2
12 12 12 12 RCHO Lumped Aldehyde >= C3 58 -
13 13 13 13 MVK Methyl Vinyl Ketone 70 -
14 14 14 14 MACR Methacrolein 70 -
15 15 15 15 PMN Peroxymethacroyl Nitrate 147 -
16 16 16 16 PPN Lumped Peroxypropionyl Nitrate 135 -
17 17 17 17 R4N2 Lumped Alkyl Nitrate 119 -
18 18 18 18 PRPE Lumped >= C3 Alkenes 12 3
19 19 19 19 C3H8 Propane 12 3
20 20 20 20 CH2O Formaldehyde 30 -
21 21 21 21 C2H6 Ethane 12 2
22 22 22 22 N2O5 Dinitrogen Pentoxide 105 -
23 23 23 23 HNO4 Pernitric Acid 79 -
24 24 24 24 MP Methyl Hydro Peroxide 48 -
25 25 25 25 DMS Dimethyl Sulfide 62 -
26 26 26 26 SO2 Sulfur Dioxide 64 -
27 27 27 27 SO4 Sulfate 96 -
28 28 28 28 SO4s Sulfate on surface of sea-salt aerosol 96 -
29 29 29 29 MSA Methyl Sulfonic Acid 96 -
30 30 30 30 NH3 Ammonia 17 -
31 31 31 31 NH4 Ammonium 18 -
32 32 32 32 NIT Inorganic nitrates 62 -
33 33 33 33 NITs Inorganic nitrates on surface of sea-salt aerosol 62 -
34 34 34 34 BCPI Hydrophilic black carbon aerosol 12 1
35 35 35 35 OCPI Hydrophilic organic carbon aerosol 12 1
36 36 36 36 BCPO Hydrophobic black carbon aerosol 12 1
37 37 37 37 OCPO Hydrophobic organic carbon aerosol 12 1
38 38 38 38 DST1 Dust aerosol, Reff = 0.7 microns 29 -
39 39 39 39 DST2 Dust aerosol, Reff = 1.4 microns 29 -
40 40 40 40 DST3 Dust aerosol, Reff = 2.4 microns 29 -
41 41 41 41 DST4 Dust aerosol, Reff = 4.5 microns 29 -
42 42 42 42 SALA Accumulation mode sea salt aerosol
(Reff = 0.01 - 0.5 microns)		 31.4 -
43 43 43 43 SALC Coarse mode sea salt aerosol
(Reff = 0.5 - 8 microns)		 31.4 -
44 44 44 44 Br2 Molecular bromine 160 -
45 45 45 45 Br Bromine radical, or atomic bromine 80 -
46 46 46 46 BrO Bromine monoxide 96 -
47 47 47 47 HOBr Hypobromous acid 97 -
48 48 48 48 HBr Hypobromic acid 81 -
49 49 49 49 BrNO2 Nitryl bromide 126 -
50 50 50 50 BrNO3 Bromine nitrate 142 -
51 51 51 51 CHBr3 Bromoform, or tribromomethane 253 -
52 52 52 52 CH2Br2 Dibromomethane 174 -
53 53 53 53 CH3Br Methyl bromide 95 -
54 54 54 54 MPN Methyl peroxy nitrate 93 -
55 55 55 55 ISOPN Isoprene nitrate 147 -
56 56 56 56 MOBA 5C acid from isoprene 114 -
57 57 57 57 PROPNN Propanone nitrate 119 -
58 58 58 58 HAC Hydroxyacetone 74 -
59 59 59 59 GLYC Glycoaldehyde 60 -
60 60 60 60 MMN Nitrate from MACR + MVK 149 -
61 61 61 61 RIP Peroxide from RIO2 118 -
62 62 62 62 IEPOX Isoprene epoxide 118 -
63 63 63 63 MAP Peroxyacetic acid 76 -
64 64 64 64 NO2 Nitrogen dioxide 46 -
65 65 65 65 NO3 Nitrate radical 62 -
66 66 66 66 HNO2 Nitrous acid 47 -
  67   67 N2O Nitrous oxide 44 -
  68   68 OCS Carbonyl sulfide 60 -
  69   69 CH4 Methane 16 -
  70   70 BrCl Bromine chloride 115 -
  71   71 HCl Hydrochloric acid 36 -
  72   72 CCl4 Carbon tetrachloride 152 -
  73   73 CH3Cl Chloromethane 50 -
  74   74 CH3CCl3 Methyl chloroform 133 -
  75   75 CFCX CFC-113, CFC-114, CFC-115 187 -
  76   76 HCFCX HCFC-123, HCFC-141b, HCFC-142b 117 -
  77   77 CFC11 CFC-11 137 -
  78   78 CFC12 CFC-12 121 -
  79   79 HCFC22 HCFC-22 86 -
  80   80 H1211 H-1211 165 -
  81   81 H1301 H-1301 149 -
  82   82 H2402 H-2402 260 -
  83   83 Cl Atomic chlorine 35 -
  84   84 ClO Chlorine monoxide 35 -
  85   85 HOCl Hypochlorous acid 52 -
  86   86 ClNO3 Chlorine nitrate 97 -
  87   87 ClNO2 Nitryl chloride 81 -
  88   88 ClOO Chlorine dioxide 67 -
  89   89 OClO Chlorine dioxide 67 -
  90   90 Cl2 Molecular chlorine 71 -
  91   91 Cl2O2 Dichlorine dioxide 103 -
  92   92 H2O Water vapor 18 -
    35   POA1 Lumped aerosol primary SVOCs (optional, replaces OCPI) 12 1
    37   POG1 Lumped gas primary SVOCs (optional, replaces OCPO) 12 1
    67 93 MTPA a-pinene, b-pinene, sabinene, carene 136.23 -
    68 94 LIMO Limonene 136.23 -
    69 95 MTPO Terpinene, terpinolene, myrcene, ocimene, other monoterpenes 136.23 -
    70 96 TSOG1 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150 -
    71 97 TSOG2 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150 -
    72 98 TSOG3 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150 -
    73 99 TSOG0 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150 -
    74 100 TSOA1 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150 -
    75 101 TSOA2 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150 -
    76 102 TSOA3 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150 -
    77 103 TSOA0 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150 -
    78 104 ISOG1 Lumped semivolatile gas products of isoprene oxidation 150 -
    79 105 ISOG2 Lumped semivolatile gas products of isoprene oxidation 150 -
    80 106 ISOG3 Lumped semivolatile gas products of isoprene oxidation 150 -
    81 107 ISOA1 Lumped semivolatile aerosol products of isoprene oxidation 150 -
    82 108 ISOA2 Lumped semivolatile aerosol products of isoprene oxidation 150 -
    83 109 ISOA3 Lumped semivolatile aerosol products of isoprene oxidation 150 -
    84 110 BENZ Benzene 12 6
    85 111 TOLU Toluene 12 7
    86 112 XYLE Xylene 12 8
    87 113 ASOG1 Lumped semivolatile gas products of light aromatics and IVOCs 150 -
    88 114 ASOG2 Lumped semivolatile gas products of light aromatics and IVOCs 150 -
    89 115 ASOG3 Lumped semivolatile gas products of light aromatics and IVOCs 150 -
    90 116 ASOAN Lumped nonvolatile aerosol products of light aromatics and IVOCs 150 -
    91 117 ASOA1 Lumped semivolatile aerosol products of light aromatics and IVOCs 150 -
    92 118 ASOA2 Lumped semivolatile aerosol products of light aromatics and IVOCs 150 -
    93 119 ASOA3 Lumped semivolatile aerosol products of light aromatics and IVOCs 150 -
    94   NAP Naphthalene/IVOC surrogate (optional) 12 10
    95   POG2 Lumped gas primary SVOCs (optional) 12 1
    96   POA2 Lumped aerosol primary SVOCs (optional) 12 1
    97   OPOG1 Lumped gas product of SVOC oxidation (optional) 12 1
    98   OPOG2 Lumped gas product of SVOC oxidation (optional) 12 1
    99   OPOA1 Lumped aerosol product of SVOC oxidation (optional) 12 1
    100   OPOA2 Lumped aerosol product of SVOC oxidation (optional) 12 1

NOTES: 

  1. To activate the NOx-Ox-HC-Aer-Br (aka "tropchem") mechanism, , set these switches in the input.geos file: 
     Online 2dy ORG AEROSOLS : F
  => Semivolatile POA?   : F 
 . . .
 Settle strat. aerosols  : F
     Online PSC AEROSOLS     : F
     Allow homogeneous NAT?  : F
     NAT supercooling req.(K): 3.0
     Ice supersaturation req.: 1.2
     Perform PSC het. chem.? : F
     Calc. strat. aero. OD?  : F
 . . .
 Use UCX strat. chem?    : F
 Online CH4 chemistry?   : F
 Active strat. H2O?      : F
    . . .
 USE solver coded by KPP : T or F (according to your preference)

    and then set the following Makefile options 

    make ... CHEM=NOx_Ox_HC_Aer_Br ...   # OR
    make ... CHEM=tropchem ...
  2. To activate the UCX mechanism, set these switches in the input.geos file: 
     Online 2dy ORG AEROSOLS : F
  => Semivolatile POA?   : F
 . . .
 Settle strat. aerosols  : T
     Online PSC AEROSOLS     : T
     Allow homogeneous NAT?  : F
     NAT supercooling req.(K): 3.0
     Ice supersaturation req.: 1.2
     Perform PSC het. chem.? : T
     Calc. strat. aero. OD?  : T
 . . .
 Use UCX strat. chem?    : T
 Online CH4 chemistry?   : T
 Active strat. H2O?      : T
 . . .
 USE solver coded by KPP : T

    and then set the following Makefile options when you compile GEOS-Chem:

    make ... CHEM=UCX UCX=y ...
  3. To activate the SOA mechanism, set these switches in the input.geos file: 
     Online 2dy ORG AEROSOLS : T
  => Semivolatile POA?   : T or F (according to your preference)
 . . .
 Settle strat. aerosols  : F
 Online PSC AEROSOLS     : F
 Allow homogeneous NAT?  : F
 NAT supercooling req.(K): 3.0
 Ice supersaturation req.: 1.2
 Perform PSC het. chem.? : F
 Calc. strat. aero. OD?  : F
 . . .
 Use UCX strat. chem?    : F
 Online CH4 chemistry?   : F
 Active strat. H2O?      : F
 . . .
 USE solver coded by KPP : T or F (according to your preference)

    and then set the following Makefile options 

    make ... CHEM=SOA ...

    The semivolatile POA and IVOC tracers (POG1-2, POA1-2, OPOG1-2, OPOA1-2, NAP) are optional in the secondary organic aerosol simulation. The default configuration is to omit these tracers. You may activate these tracers by setting this switch in the input.geos file: 

      => Semivolatile POA?   : T
  4. To activate the benchmark mechanism, set these switches in the input.geos file: 
     Online 2dy ORG AEROSOLS : T
  => Semivolatile POA?   : F
 . . .
 Settle strat. aerosols  : T
 Online PSC AEROSOLS     : T
 Allow homogeneous NAT?  : F
 NAT supercooling req.(K): 3.0
 Ice supersaturation req.: 1.2
 Perform PSC het. chem.? : T
 Calc. strat. aero. OD?  : T
 . . .
 Use UCX strat. chem?    : T
     Online CH4 chemistry?   : T
     Active strat. H2O?      : T
 . . .
 USE solver coded by KPP : T

    and then set the following Makefile options when you compile GEOS-Chem:

    make ... CHEM=benchmark UCX=y...

    Also, the benchmark simulation will be selected by default if you do not pick a value for CHEM.

  5. Each of these chemistry mechanism requires different versions of globchem.dat, jv_spec.dat, mglob.dat and ratj.d. The proper files are included when you download the various GEOS-Chem run directories (see Chapter 2.3).

  6. The molecular weight of 31.4 g/mole for the sea salt tracers (SALA and SALC) is consistent with actual average composition of sea salt, and international guidelines from the IAPWS. You may use the molecular weight of any individual constituent of interest.

  7. GEOS-Chem also has a dicarbonyls simulation, but as of this writing this simulation is in need of updating. For more information please see our Dicarbonyls simulation wiki page.

A1.2 Aersosol-only simulations

You can run a GEOS-Chem aerosol-only simulation without having to call the SMVGEAR II or KPP solver. The tracer list is below.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for aerosol-only simulations
  2. GEOS-Chem Wiki: Offline aerosol chemistry simulation
  3. GEOS-Chem Wiki: Sulfate aerosols
  4. GEOS-Chem Wiki: Carbonaceous aerosols
  5. GEOS-Chem Wiki: Secondary organic aerosols
  6. GEOS-Chem Wiki: Mineral dust aerosols
  7. GEOS-Chem Wiki: Sea salt aerosols
SOA
#		 # Name Description g/mole
1 1 DMS Dimethyl sulfide 62
2 2 SO2 Sulfur dioxide 64
3 3 SO4 Sulfate 96
4 4 SO4s Sulfate on surface of sea salt aerosol 96
5 5 MSA Methane Sulfionic Acid 96
6 6 NH3 Ammonia 17
7 7 NH4 Ammonium 18
8 8 NIT Inorganic sulfur nitrates 62
9 9 NITs Inorganic sulfur nitrates on surface of sea-salt aerosol 62
10 10 H2O2 Hydrogen Peroxide 34
11 11 BCPI Hydrophilic black carbon aerosol 12
12 12 OCPI Hydrophilic organic carbon aerosol 12
13 13 BCPO Hydrophobic black carbon aerosol 12
14 14 OCPO Hydrophobic organic carbon aerosol 12
15 15 DST1 Dust aerosol, Reff = 0.7 microns 29
16 16 DST2 Dust aerosol, Reff = 1.4 microns 29
17 17 DST3 Dust aerosol, Reff = 2.4 microns 29
18 18 DST4 Dust aerosol, Reff = 4.5 microns 29
19 19 SALA Accumulation mode sea salt aerosol
(Reff = 0.1 - 2.5 microns)		 31.4
20 20 SALC Coarse mode sea salt aerosol
(Reff = 2.5 - 4 microns)		 31.4
21   MTPA A-pinene, B-pinene, sabinene, carene 136.23
22   LIMO Limonene 136.23
23   MTPO Terpinene, terpinolene, myrcene, ocimene, other monoterpenes 136.23
24   TSOG1 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150
25   TSOG2 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150
26   TSOG3 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150
27   TSOG0 Lumped semivolatile gas products of monoterpene + sesquiterpene oxidation 150
28   TSOA1 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150
29   TSOA2 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150
30   TSOA3 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150
31   TSOA0 Lumped semivolatile aerosol products of monoterpene + sesquiterpene ox. 150
32   ISOG1 Lumped semivolatile gas products of isoprene oxidation 150
33   ISOG2 Lumped semivolatile gas products of isoprene oxidation 150
34   ISOG3 Lumped semivolatile gas products of isoprene oxidation 150
35   ISOA1 Lumped semivolatile aerosol products of isoprene oxidation 150
36   ISOA2 Lumped semivolatile aerosol products of isoprene oxidation 150
37   ISOA3 Lumped semivolatile aerosol products of isoprene oxidation 150
38   BENZ Benzene 12
39   TOLU Toluene 12
40   XYLE Xylene 12
41   ASOG1 Lumped semivolatile gas products of light aromatics and IVOCs 150
42   ASOG2 Lumped semivolatile gas products of light aromatics and IVOCs 150
43   ASOG3 Lumped semivolatile gas products of light aromatics and IVOCs 150
44   ASOAN Lumped nonvolatile aerosol products of light aromatics and IVOCs 150
45   ASOA1 Lumped semivolatile aerosol products of light aromatics and IVOCs 150
46   ASOA2 Lumped semivolatile aerosol products of light aromatics and IVOCs 150
47   ASOA3 Lumped semivolatile aerosol products of light aromatics and IVOCs 150

NOTE: You may omit the secondary organic aerosol tracers (MTPA, LIMO, MTPO, TSOG0-3, TSOA0-3, ISOG1-3, ISOA1-3, ASOG1-3, ASOA1-3, ASOAN, BENZ, TOLU, XYLE) by setting the following switches in the aerosol menu section of the input.geos file.

   Online 2dy ORG AEROSOLS : F

If you omit the secondary organic aerosol tracers then there will be a total of 20 tracers.

A1.3 CO2 simulations

Ray Nassar updated the CO2 simulation in GEOS-Chem v8-03-02.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for CO2 simulations
  2. GEOS-Chem Wiki: CO2 simulation
# Name Description g/mole
1 CO2 Total CO2 44

You may add tracers for additional CO2 sources:
2 CO2ff CO2 from fossil fuel emissions 44
3 CO2oc CO2 from ocean emissions 44
4 CO2bal CO2 from balanced biosphere 44
5 CO2bb CO2 from biomass burning emissions 44
6 CO2bf CO2 from biofuel emissions 44
7 CO2nte CO2 from net terrestrial exchange 44
8 CO2se CO2 from ship emissions 44
9 CO2av CO2 from aircraft emissions 44
10 CO2ch CO2 from chemical source 44
11 CO2corr CO2 chemical source surface correction 44

For a full tagged CO2 simulation, you can add the following tracers.
NOTE: These extra tracers are only valid for a 2 x 2.5 simulation.
12 CO2bg CO2 background (including only fossil fuel CO2) 44
13-52 CO2xx CO2 tracers produced in various geographic regions 44
53 CO2se CO2 from shipping 44
54 CO2av CO2 from aviation 44

A1.4 CH4 simulations

Christopher Pickett-Heaps and Kevin Wecht updated the CH4 simulation in GEOS-Chem v8-02-03. Kevin Wecht has further refined the CH4 simulation since then.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for a CH4 simulations
  2. GEOS-Chem Wiki: CH4 simulation
# Name Description g/mole
1 CH4 Total CH4 16

You may add tracers for additional CH4 sources:
2 CH4og CH4 produced by oil & gas processing 16
3 CH4cm CH4 produced by coal mining 16
4 CH4ls CH4 produced by livestock 16
5 CH4wa CH4 produced by waste 16
6 CH4bf CH4 produced by biofuel 16
7 CH4ri CH4 produced by rice 16
8 CH4an CH4 produced by other anthropogenic processes 16
9 CH4bb CH4 produced by biomass burning 16
10 CH4we CH4 produced by wetlands 16
11 CH4sa CH4 produced by soil absorption 16
12 CH4nat CH4 produced by other natural sources 16

A1.5 Hg simulations

You can peform the following GEOS-Chem mercury simulations:

  1. Simulation with the total Hg0, Hg2, and HgP tracers only, with or without the Global Terrestrial Mercury Model option.
  2. Simulation with all tagged Hg0, Hg2, and HgP tracers.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for Total Hg and Tagged Hg simulations
  2. GEOS-Chem Wiki: Mercury simulation
  3. GEOS-Chem Wiki: Global Terrestrial Mercury Model
# Name Description g/mole
1 Hg0 Elemental Mercury (total tracer) 201
2 Hg2 Divalent Mercury (total tracer) 201
3 HgP Particulate Mercury (total tracer) 201

You may add tracers for additional Hg sources:
4 Hg0_can Elemental Mercury (Canada anthro tagged tracer) 201
5 Hg0_usa Elemental Mercury (USA anthro tagged tracer) 201
6 Hg0_cam Elemental Mercury (Centeral America anthro tagged tracer) 201
7 Hg0_sam Elemental Mercury (South America anthro tagged tracer) 201
8 Hg0_waf Elemental Mercury (West Africa anthro tagged tracer) 201
9 Hg0_eaf Elemental Mercury (East Africa anthro tagged tracer) 201
10 Hg0_saf Elemental Mercury (South Africa anthro tagged tracer) 201
11 Hg0_naf Elemental Mercury (North Africa anthro tagged tracer) 201
12 Hg0_eur Elemental Mercury (Europe anthro tagged tracer) 201
13 Hg0_eeu Elemental Mercury (Eastern Europe anthro tagged tracer) 201
14 Hg0_sov Elemental Mercury (Former USSR anthro tagged tracer) 201
15 Hg0_mde Elemental Mercury (Middle East anthro tagged tracer) 201
16 Hg0_sas Elemental Mercury (South Asia anthro tagged tracer) 201
17 Hg0_sov Elemental Mercury (East Asia anthro tagged tracer) 201
18 Hg0_sea Elemental Mercury (Southeast Asia anthro tagged tracer) 201
19 Hg0_jpn Elemental Mercury (Japan anthro tagged tracer) 201
20 Hg0_oce Elemental Mercury (Ocean anthro tagged tracer) 201
21 Hg0_so Elemental Mercury (Organic soils tagged tracer) 201
22 Hg0_bb Elemental Mercury (Biomass burning tagged tracer) 201
23 Hg0_geo Elemental Mercury (Geogenic tagged tracer) 201
24 Hg0_atl Elemental Mercury (Middle Atlantic subsurface waters tagged tracer) 201
25 Hg0_nat Elemental Mercury (North Atlantic subsurface waters tagged tracer) 201
26 Hg0_sat Elemental Mercury (South Atlantic subsurface waters tagged tracer) 201
27 Hg0_npa Elemental Mercury (North Pacific subsurface waters tagged tracer) 201
28 Hg0_arc Elemental Mercury (Arctic subsurface waters tagged tracer) 201
29 Hg0_ant Elemental Mercury (Antarctic subsurface waters tagged tracer) 201
30 Hg0_ocn Elemental Mercury (Indo-Pacific subsurface waters tagged tracer) 201
31 Hg0_str Elemental Mercury (Stratospheric tagged tracer) 201
32 Hg2_can Divalent Mercury (Canada anthro tagged tracer) 201
33 Hg2_usa Divalent Mercury (USA anthro tagged tracer) 201
34 Hg2_cam Divalent Mercury (Centeral America anthro tagged tracer) 201
35 Hg2_sam Divalent Mercury (South America anthro tagged tracer) 201
36 Hg2_waf Divalent Mercury (West Africa anthro tagged tracer) 201
37 Hg2_eaf Divalent Mercury (East Africa anthro tagged tracer) 201
38 Hg2_saf Divalent Mercury (South Africa anthro tagged tracer) 201
39 Hg2_naf Divalent Mercury (North Africa anthro tagged tracer) 201
40 Hg2_eur Divalent Mercury (Europe anthro tagged tracer) 201
41 Hg2_eeu Divalent Mercury (Eastern Europe anthro tagged tracer) 201
42 Hg2_sov Divalent Mercury (Former USSR anthro tagged tracer) 201
43 Hg2_mde Divalent Mercury (Middle East anthro tagged tracer) 201
44 Hg2_sas Divalent Mercury (South Asia anthro tagged tracer) 201
45 Hg2_sov Divalent Mercury (East Asia anthro tagged tracer) 201
46 Hg2_sea Divalent Mercury (Southeast Asia anthro tagged tracer) 201
47 Hg2_jpn Divalent Mercury (Japan anthro tagged tracer) 201
48 Hg2_oce Divalent Mercury (Ocean anthro tagged tracer) 201
49 Hg2_so Divalent Mercury (Organic soils tagged tracer) 201
50 Hg2_bb Divalent Mercury (Biomass burning tagged tracer) 201
51 Hg2_geo Divalent Mercury (Geogenic tagged tracer) 201
52 Hg2_atl Divalent Mercury (Middle Atlantic subsurface waters tagged tracer) 201
53 Hg2_nat Divalent Mercury (North Atlantic subsurface waters tagged tracer) 201
54 Hg2_sat Divalent Mercury (South Atlantic subsurface waters tagged tracer) 201
55 Hg2_npa Divalent Mercury (North Pacific subsurface waters tagged tracer) 201
56 Hg2_arc Divalent Mercury (Arctic subsurface waters tagged tracer) 201
57 Hg2_ant Divalent Mercury (Antarctic subsurface waters tagged tracer) 201
58 Hg2_ocn Divalent Mercury (Indo-Pacific subsurface waters tagged tracer) 201
59 Hg2_str Divalent Mercury (Stratospheric tagged tracer) 201
60 HgP_can Particulate Mercury (Canada anthro tagged tracer) 201
61 HgP_usa Particulate Mercury (USA anthro tagged tracer) 201
62 HgP_cam Particulate Mercury (Centeral America anthro tagged tracer) 201
63 HgP_sam Particulate Mercury (South America anthro tagged tracer) 201
64 HgP_waf Particulate Mercury (West Africa anthro tagged tracer) 201
65 HgP_eaf Particulate Mercury (East Africa anthro tagged tracer) 201
66 HgP_saf Particulate Mercury (South Africa anthro tagged tracer) 201
67 HgP_naf Particulate Mercury (North Africa anthro tagged tracer) 201
68 HgP_eur Particulate Mercury (Europe anthro tagged tracer) 201
69 HgP_eeu Particulate Mercury (Eastern Europe anthro tagged tracer) 201
70 HgP_sov Particulate Mercury (Former USSR anthro tagged tracer) 201
71 HgP_mde Particulate Mercury (Middle East anthro tagged tracer) 201
72 HgP_sas Particulate Mercury (South Asia anthro tagged tracer) 201
73 HgP_sov Particulate Mercury (East Asia anthro tagged tracer) 201
74 HgP_sea Particulate Mercury (Southeast Asia anthro tagged tracer) 201
75 HgP_jpn Particulate Mercury (Japan anthro tagged tracer) 201
76 HgP_oce Particulate Mercury (Ocean anthro tagged tracer) 201
77 HgP_so Particulate Mercury (Organic soils tagged tracer) 201
78 HgP_bb Particulate Mercury (Biomass burning tagged tracer) 201
79 HgP_geo Particulate Mercury (Geogenic tagged tracer) 201
80 HgP_atl Particulate Mercury (Middle Atlantic subsurface waters tagged tracer) 201
81 HgP_nat Particulate Mercury (North Atlantic subsurface waters tagged tracer) 201
82 HgP_sat Particulate Mercury (South Atlantic subsurface waters tagged tracer) 201
83 HgP_npa Particulate Mercury (North Pacific subsurface waters tagged tracer) 201
84 HgP_arc Particulate Mercury (Arctic subsurface waters tagged tracer) 201
85 HgP_ant Particulate Mercury (Antarctic subsurface waters tagged tracer) 201
86 HgP_ocn Particulate Mercury (Indo-Pacific subsurface waters tagged tracer) 201
87 HgP_str Particulate Mercury (Stratospheric tagged tracer) 201

A1.6 POPs simulations

Carey Friedman and Noelle Selin developed the POPs simulation, available in GEOS-Chem v9-02 and later versions. Three separate polycyclic aromatic hydrocarbons (PAHs) are modeled: phenanthrene (PHE), pyrene (PYR), and benzo[a]pyrene (BaP).

For more information about this simulation, please see:

  1. Chapter 6: Checklist for POPs simulations
  2. GEOS-Chem Wiki: POPs simulation
# Name Description g/mole
1 POPG Gas-phase POP 178.23
2 POPPOC Organic carbon-bound particulate 178.23
3 POPPBC Black carbon-bound particulate 178.23

NOTE: The molecular weight of PHE is listed in the table above. Use 202.25 g/mole for PYR or 252.31 g/mole for BaP.

A1.7 Tagged CO simulations

Several GEOS-Chem users have customized the tagged CO simulation to their own purposes. Listed below is the "standard" Tagged CO configuration.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for tagged CO simulations
  2. GEOS-Chem Wiki: Tagged CO simulation
# Name Description g/mole
1 CO Total CO 28
2 COus CO from US fossil fuel emissions 28
3 COeur CO from European fossil fuel emissions 28
4 COasia CO from Asian fossil fuel emissions 28
5 COoth CO from fossil fuel emissions -- rest of world 28
6 CObbAm CO from South American biomass burning 28
7 CObbAf CO from African biomass burning 28
8 CObbAs CO from SE Asian biomass burning 28
9 CObbOc CO from Oceania biomass burning 28
10 CObbEu CO from European biomass burning 28
11 CObbNA CO from North American biomass burning 28
12 COch4 CO chemically produced from methane oxidation 28
13 CObiof CO from biofuel burning (whole world) 28
14 COisop CO chemically produced from isoprene oxidation 28
15 COmono CO chemically produced from monoterpenes oxidation 28
16 COmeoh CO chemically produced from methanol oxidation 28
17 COacet CO chemically produced from acetone oxidation 28

A1.8 Tagged O3 simulations

At present, you can perform two types of tagged O3 simulations:

  1. SIMPLE SIMULATION: with total O3 and stratospheric O3 tracers. (This is the default setting.)
  2. EXTENDED SIMULATION: with total O3 and stratopsheric O3 tracers, plus several other regional O3 tracers.

NOTES:

  1. Stratospheric O3 is always tracer #2. This is for compatibility with the Linoz stratospheric ozone chemistry scheme.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for Tagged O3 simulations
  2. GEOS-Chem Wiki: Tagged O3 simulation
# Name Description g/mole
1 O3 Total O3 46
2 O3Strt O3 produced in the stratosphere 46

You may add tracers for additional O3 sources:
3 O3UT O3 produced in the upper troposphere (above 350 hPa) 46
4 O3MT O3 produced in the middle troposphere (PBL top - 350 hPa) 46
5 O3ROW O3 produced in the rest of the world 46
6 O3PcBL O3 produced in the Pacific Ocean boundary layer 46
7 O3NABL O3 produced in the North American boundary layer 46
8 O3AtBL O3 produced in the Atlantic Ocean boundary layer 46
9 O3EuBL O3 produced in the European boundary layer 46
10 O3AfBL O3 produced in the African boundary layer 46
11 O3AsBl O3 produced in the Asian boundary layer 46
12 O3Init O3 from the initial condition 46
13 O3USA O3 produced over the United States (surface - tropopause) 46

A1.9 Rn-Pb-Be simulations

We recommend that you run a Radon-Lead-Beryllium simulation to validate any modifications to the convective updraft scavenging or wet deposition algoritms.

For more information about this simulation, please see:

  1. Chapter 6: Checklist for Rn–Pb–Be simulations
  2. GEOS-Chem Wiki: Rn-Pb-Be simulation
# Name Description g/mole
1 Rn Radon-222 isotope 222
2 Pb Lead-210 isotope 210
3 Be7 Beryllium-7 isotope 7

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