GEOS-Chem chemistry mechanisms: Difference between revisions
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=== Chemistry mechanisms in GEOS-Chem v10 === | === 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 | 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. | 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. | ||
Revision as of 14:05, 1 October 2013
On this page, we provide an overview of the chemistry mechanisms used in GEOS-Chem.
Overview
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 recent updates made to the various mechanisms.
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 | Nickname | Solvers |
|---|---|---|---|
| standard |
|
Full-chemistry or fullchem |
|
| SOA |
|
SOA |
|
| Dicarbonyls |
|
Dicarbonyls |
|
| isoprene |
|
Caltech isoprene scheme, Paulot isoprene scheme |
|
The bromine tracers and species were added to the standard mechanism just prior to the release of GEOS-Chem v9-01-03.
-Bob Y. 17:00, 30 September 2013 (EDT)
Mechanisms in GEOS-Chem v9-02 and later versions
Several modifications were made to the above-mentioned chemistry mechanisms in GEOS-Chem v9-02, as listed below:
| Mechanism | Description | Nickname | Solvers |
|---|---|---|---|
| standard |
|
Full-chemistry or fullchem |
|
| SOA |
|
SOA |
|
| Dicarbonyls |
|
Dicarbonyls |
|
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.
--Bob Y. 09:56, 1 October 2013 (EDT)
Chemistry mechanisms in GEOS-Chem v10
We propose adding the Unified tropospheric-stratospheric Chemistry eXtension (UCX) mechanism into the release following v9-02. UCX, which was developed by Steven Barrett's group (the MIT Laboratory for Aviation and the Environment), combines the existing GEOS-Chem "standard" mechanism (based on 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.
--Bob Y. 10:04, 1 October 2013 (EDT)