Emissions overview

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Here is a quick overview of the emissions inventories that are currently available in GEOS-Chem.

Anthropogenic emissions

See our anthropogenic emissions wiki page for details about all global and regional inventories, or download the following documentation:


By default, GEOS-Chem uses the GEIA inventory with 10 gas-phase species:

Species Name Equivalent # of carbons
NOx Odd nitrogen = NO2 + NO + NO3 + HNO2  
CO Carbon monoxide  
PRPE >= C3 Alkanes 3
C3H8 Propane 3
ALK4 >= C4 Alkenes 4
C2H6 Ethane 2
ACET Acetone 3
MEK Methyl Ethyl Ketone 4
ALD2 Acetaldehyde 3
CH2O Formaldehyde  

and 2 carbon aerosol species from Bond et al:

Species Name Equivalent # of carbons
BC Black Carbon 1
OC Organic Carbon 1

Biofuel emissions

GEOS-Chem emits the same 12 species as for anthropogenic emissions listed above.

These are overwritten by Biofuel emissions and/or STREETS 2006 if these inventory are used for anthropogenic emissions for USA and/or SE-Asia.

Biogenic emissions

By default, GEOS-Chem emits the following species from the GEIA biogenic inventory:

Species Name Generic formula Equivalent # of carbons
ISOP Isoprene C5H8 5
MONOT Monoterpenes C10H16 10
MBO Methyl Butenol C5H10O 5
ACET Acetone CH3COCH3 3
ALK4 (scaled from ISOP) >=C4 alkenes   4


The following species may be overwritten with the MEGAN inventory:

  1. Isoprene
  2. Monoterpenes
  3. Methyl Butenol

MEGAN biogenic VOC emission is available but not used.

Please see our Isoprene Emission Estimates in the Literature page for Isoprene Emission Estimates in the literature.

Biomass burning

By default GEOS-Chem uses 15 biomass burning species from Duncan et al:

  1. NOx
  2. CO
  3. ALK4
  4. ACET
  5. MEK
  6. ALD2
  7. PRPE
  8. C3H8
  9. CH2O
  10. C2H6
  11. SO2
  12. NH3
  13. BC
  14. OC
  15. CO2 (NOTE: for offline simulations only!)

Most of these are also anthropogenic emissions species.

All of these species can be overwritten by GFED2 monthly, 8-days, or 3hr biomass emissions.

--Phs and Bmy 10:14, 18 September 2009 (EDT)

Volcanic emissions

Please see our Volcanic SO2 emissions from Aerocom wiki page.

--Bob Y. 09:52, 16 February 2010 (EST)