GEOS-Chem chemistry mechanisms

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On this page, we provide an overview of the chemistry mechanisms used in GEOS-Chem.

Overview

NOx-Ox-hydrocarbon-aerosol chemistry

The standard NOx-Ox-hydrocarbon-aerosol (aka "full-chemistry") simulation has undergone several updates in recent GEOS-Chem versions. We

Mechanisms in GEOS-Chem v9-01-03 and prior versions

In GEOS-Chem v9-01-03, users could select from one of four pre-defined chemistry mechanisms:


Mechanism Description Solvers
standard
  • NOx-Ox-hydrocarbon-aerosol species (aka "the full-chemistry mechanism")
SMVGEAR, KPP
SOA
  • NOx-Ox-hydrocarbon-aerosol species
  • PLUS secondary organic aerosol species
SMVGEAR, KPP
Dicarbonyls
  • NOx-Ox-hydrocarbon-aerosol species
  • PLUS dicarbonyl species
SMVGEAR only
isoprene
  • NOx-Ox-hydrocarbon-aerosol species
  • PLUS isoprene oxidation products
SMVGEAR, KPP

All of these mechanisms (with the exception of the dicarbonyls simulation) are compatible with both the SMVGEAR solver and the KPP solver. The dicarbonyls mechanism only works with SMVGEAR.

Prior to the release of GEOS-Chem v9-01-03, several new bromine tracers and species were added to the s


Mechanisms in GEOS-Chem v9-02 and later versions

Solvers