GEOS–CHEM v6–02–05 User's Guide
Contact: Bob Yantosca (bmy@io.harvard.edu)

Appendix 1: GEOS–CHEM Tracers, by Simulation

A1.1 Rn-Pb-Be simulations (NSRCX = 1)
#
Name
Description
g/mole
1 Rn222 Radon-222 isotope 222
2 Pb210 Lead-210 isotope 210
3 Be7 Beryllium-7 isotope 7

A1.2 CH3I simulations (NSRCX = 2)
# Name Description g/mole
1 CH3I-oc Methyl iodide from oceans 141.939
2 CH3I-bb Methyl iodide from biomass burning 141.939
3 CH3I-bf Methyl iodide from biofuel burning 141.939
4 CH3I-rc Methyl iodide from rice paddies 141.939
5 CH3I-wl Methyl iodide from wetlands 141.939

A1.3 NOx-Ox-hydrodcarbon simulations (NSRCX = 3)

The tracers listed below are in general either long-lived (and must be transported in the model), or are "families" consisting of two or more molecules. For a complete list of all of the chemical species used in the SMVGEAR chemistry mechanism, please consult Appendix 6.

Also, tracers in ITALICS are carried 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.

# Name Description g/mole mole C/
mole tracer
1 NOx NO + NO2+ NO3 + HNO2 46 -
2 Ox O3 + NO2 + 2NO3 48 -
3 PAN Peroxyacetyl Nitrate 121 -
4 CO Carbon Monoxide 28 -
5 ALK4 Lumped >= C4 Alkanes 12 4
6 ISOP Isoprene 12 5
7 HNO3 Nitric Acid 63 -
8 H2O2 Hydrogen Peroxide 34 -
9 ACET Acetone 12 3
10 MEK Methyl Ethyl Ketone 12 4
11 ALD2 Acetaldehyde 12 2
12 RCHO Lumped Aldehyde >= C3 58 -
13 MVK Methyl Vinyl Ketone 70 -
14 MACR Methacrolein 70 -
15 PMN Peroxymethacroyl Nitrate 147 -
16 PPN Lumped Peroxymethacroyl Nitrate 135 -
17 R4N2 Lumped Alkyl Nitrate 119 -
18 PRPE Lumped >= C3 Alkenes 12 3
19 C3H8 Propane 12 3
20 CH2O Formaldehyde 30 -
21 C2H6 Ethane 12 2
22 N2O5 Dinitrogen Pentoxide 105 -
23 HNO4 Pernitric Acid 79 -
24 MP Methyl Hydro Peroxide 48 -
25 DMS Dimethyl Sulfate 62 -
26 SO2 Sulfur Dioxide 64 -
27 SO4 Sulfate 96 -
28 MSA Methyl Sulfionic Acid 96 -
29 NH3 Ammonia 17 -
30 NH4 Ammonium 18 -
31 NIT Sulfur Nitrates 62 -
32 BCPI Hydrophilic black carbon aerosol 12 1
33 OCPI Hydrophilic organic carbon aerosol 12 1
34 BCPO Hydrophobic black carbon aerosol 12 1
35 OCPO Hydrophobic organic carbon aerosol 12 1
36 DST1 Dust aerosol, Reff = 0.7 microns 29
37 DST2 Dust aerosol, Reff = 1.4 microns 29
38 DST3 Dust aerosol, Reff = 2.4 microns 29
39 DST4 Dust aerosol, Reff = 4.5 microns 29
40 SALA Accumulation mode sea salt aerosol
(Reff = 0.1 – 2.5 microns)		 36
41 SALC Coarse mode sea salt aerosol
(Reff = 2.5 – 10 microns)		 36

A1.4 HCN simulations (NSRCX = 4)
# Name Description g/mole
1 HCN Hydrogen Cyanide 27

A1.5 CO with parameterized OH simulations (NSRCX = 5)
# Name Description g/mole
1 CO Carbon Monoxide 28

A1.6 Tagged Ox simulations (NSRCX = 6)
# Name Description g/mole
1 Ox Total Ox (O3 + NO2 + 2NO3) 46
2 OxUT Ox produced in the upper troposphere (above 350 hPa) 46
3 OxMT Ox produced in the middle troposphere (PBL top – 350 hPa) 46
4 OxROW Ox produced in the rest of the world 46
5 OxPcBL Ox produced in the Pacific Ocean boundary layer 46
6 OxNABL Ox produced in the North American boundary layer 46
7 OxAtBL Ox produced in the Atlantic Ocean boundary layer 46
8 OxEuBL Ox produced in the European boundary layer 46
9 OxAfBL Ox produced in the African boundary layer 46
10 OxAsBl Ox produced in the Asian boundary layer 46
11 OxStrt Ox produced in the stratosphere 46
12 OxInit Ox from the initial condition 46
13 OxUSA Ox produced over the United States (surface - tropopause) 46

A1.7 Tagged CO simulations (NSRCX = 7)

NOTE: Several GEOS–CHEM users have customized the tagged CO simulation to their own purposes. Listed below are two such simulations. The "standard" Tagged CO simulation is the simulation that "ships" with GEOS–CHEM. The IAPS Tagged CO simulation is the simulation which was used to provide daily forecasts during the ITCT 2k2 mission in Spring 2002.

A1.7.1 "Standard" Tagged CO
# 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

A1.7.2 Tagged CO for NOAA ITCT2K2 forecasts w/ the IAPS chemical forecasting system

# Name Description g/mole
1 CO Total CO 28
2 COffAs CO from Asian Fossil Fuel 28
3 COffEu CO from European Fossil Fuel 28
4 COffNa CO from North American Fossil Fuel 28
5 CObbAs CO from Asian Biomass Burning 28

A1.8 Offine sulfate-aersosol simulations (NSRCX = 10)
# Name Description g/mole
1 DMS Dimethyl sulfide 62
2 SO2 Sulfur dioxide 64
3 SO4 Sulfate 96
4 MSA Methane Sulfionic Acid 96
5 NH3 Ammonia 17
6 NH4 Ammonium 18
7 NIT Sulfur Nitrates 62
8 H2O2 Hydrogen Peroxide

34
9 BCPI Hydrophilic black carbon aerosol 12
10 OCPI Hydrophilic organic carbon aerosol 12
11 BCPO Hydrophobic black carbon aerosol 12
12 OCPO Hydrophobic organic carbon aerosol 12
13 DST1 Dust aerosol, Reff = 0.7 microns 29
14 DST2 Dust aerosol, Reff = 1.4 microns 29
15 DST3 Dust aerosol, Reff = 2.4 microns 29
16 DST4 Dust aerosol, Reff = 4.5 microns 29
17 SALA Accumulation mode sea salt aerosol
(Reff = 0.1 – 2.5 microns)		 36
18 SALC Coarse mode sea salt aerosol
(Reff = 2.5 – 10 microns)		 36


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