GEOS-Chem chemistry mechanisms: Difference between revisions

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On this page, we provide an overview of the chemistry mechanisms used in GEOS-Chem.
#REDIRECT [[Simulations using KPP-built mechanisms]]
 
== Overview ==
 
GEOS-Chem can perform many different types of chemical simulations, including:
 
*Several detailed ozone chemistry mechanisms
*Specialty simulations for tracers with simpler chemistry, including
**Radon-Lead-Beryllium
**Carbon gases (CO, CO2)
**Mercury
**Methane
**etc.
 
You may find more information about each of these mechanisms in the subsections below.
 
--[[User:Bmy|Bob Y.]] 10:08, 1 October 2013 (EDT)
 
== NOx-Ox-hydrocarbon-aerosol chemistry and variants ==
 
The NOx-Ox-hydrocarbon-aerosol (aka "full-chemistry") simulations have undergone several updates in recent GEOS-Chem versions.  We provide a summary of these updates in this section.
 
=== 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:
 
{| border=1 cellspacing=0 cellpadding=5
|-bgcolor="#CCCCCC"
!width="100px"|Mechanism
!width="500x"|Description
!width="175px"|Nickname
!width="150px"|Solvers
 
|-valign="top"
|[[NOx-Ox-HC-aerosol|standard]]
|
*NOx-Ox-hydrocarbon-aerosol species
*PLUS [[Bromine chemistry mechanism|bromine species]]
|Full-chemistry or fullchem
|
*SMVGEAR
*KPP
 
|-valign="top"
|[[Secondary organic aerosols|SOA]]
|
*NOx-Ox-hydrocarbon-aerosol species
*PLUS secondary organic aerosol species
|SOA
|
*SMVGEAR
*KPP-
 
|-valign="top"
|[[Dicarbonyls simulation|Dicarbonyls]]
|
*NOx-Ox-hydrocarbon-aerosol species
*PLUS dicarbonyl species
|Dicarbonyls
|
*SMVGEAR only
 
|-valign="top"
|[[New isoprene scheme|isoprene]]
|
*NOx-Ox-hydrocarbon-aerosol species
*PLUS isoprene oxidation products
|Caltech isoprene scheme,<br>Paulot isoprene scheme
|
*SMVGEAR
*KPP
|}
 
The [[Bromine chemistry mechanism|bromine tracers and species]] were added to the standard mechanism just prior to the release of [[GEOS-Chem v9-01-03]].
 
-[[User:Bmy|Bob Y.]] 17:00, 30 September 2013 (EDT)
 
=== Mechanisms in GEOS-Chem v9-02 and later versions ===
 
Several modifications were made to the [[#Mechanisms in GEOS-Chem v9-01-03 and prior versions|above-mentioned chemistry mechanisms]] in [[GEOS-Chem v9-02]], as listed below:
 
{| border=1 cellspacing=0 cellpadding=5
|-bgcolor="#CCCCCC"
!width="100px"|Mechanism
!width="500px"|Description
!width="175px"|Nickname
!width="150px"|Solvers
 
|-valign="top"
|[[NOx-Ox-HC-aerosol|standard]]
|
*[[NOx-Ox-HC-aerosol|NOx-Ox-hydrocarbon-aerosol]] species
*PLUS [[Bromine chemistry mechanism|bromine species]]
*PLUS [[Updating_standard_chemistry_with_JPL_10-6|Updates to inorganic chemistry reactions (cf. JPL 10-6)]]
*PLUS [[Methyl peroxy nitrate chemistry]]
*PLUS [[New isoprene scheme|Isoprene oxidation species chemistry (aka "Caltech isoprene scheme")]]
*PLUS [[New_isoprene_scheme#Update_One_-_RO2.2BHO2_Reaction_Rate|Fix RO2+HO2 rate constant]]
*PLUS [[New_isoprene_scheme#NO3_aerosol_reactive_uptake_coefficient|Increase of NO3 uptake by aerosol]]
*PLUS [[NOx-Ox-HC-aerosol#Removal_of_NOx_and_Ox_partitioning|Removal of NOx and Ox partitioning]]
*PLUS [[ChemTelecon20111202|Inhibition of N2O5 uptake by nitrate aerosol]]
*PLUS [[NOx-Ox-HC-aerosol#Improved_HO2_uptake|Improved HO2 uptake by aerosol]]
|Full-chemistry or fullchem
|
*SMVGEAR
*KPP
 
|-valign="top"
|[[Secondary organic aerosols|SOA]]
|
*Everything in the "standard" simulation listed above
*PLUS Updated SOA species
*PLUS [[Secondary_organic_aerosols#SOA_simulation_with_semi-volatile_POA|Semi-volatile primary organic aerosol (OPTIONAL)]]
|SOA
|
*SMVGEAR
*KPP-
 
|-valign="top"
|[[Dicarbonyls simulation|Dicarbonyls]]
|
*NOx-Ox-hydrocarbon-aerosol species
*PLUS dicarbonyl species
|Dicarbonyls
|
*SMVGEAR only
 
|}
 
Starting with v9-02, family tracers (NOx, Ox) have now been removed from all GEOS-Chem mechanisms.  The individual family members (NO, NO2, O3, etc.) are now carried as individual advected tracers and chemical species.  Also, the isoprene mechanism from v9-01-03 now has been folded into the standard mechanism.
 
--[[User:Bmy|Bob Y.]] 09:56, 1 October 2013 (EDT)
 
=== Chemistry mechanisms in GEOS-Chem v10 ===
 
We propose adding the [[UCX chemistry mechanism|'''Unified tropospheric-stratospheric Chemistry eXtension''' (UCX) mechanism]] into the release following v9-02.  UCX, which was developed by Steven Barrett's group (the [http://lae.mit.edu MIT Laboratory for Aviation and the Environment]), combines the existing GEOS-Chem [[NOx-Ox-HC-aerosol|"standard" mechanism]] (based on [[GEOS-Chem v9-01-03|v9-01-03]]) with several new stratospheric species and reactions.
 
Because UCX will be a major update to GEOS-Chem, we propose naming the version in which it ships to GEOS-Chem v10-01.  This will make it easier to denote versions that contain UCX from versions that do not.
 
--[[User:Bmy|Bob Y.]] 10:04, 1 October 2013 (EDT)
 
=== Solvers ===

Latest revision as of 15:32, 21 May 2024

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