Tagged O3 simulation

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  1. Simulations using KPP-built mechanisms
  2. Aerosol-only simulation
  3. CH4 simulation
  4. CO2 simulation
  5. Hg simulation
  6. POPs simulation
  7. Tagged CO simulation
  8. Tagged O3 simulation
  9. TransportTracers simulation

This page contains information about the Tagged O3 simulation in GEOS-Chem (formerly known as the "Tagged Ox" simulation).


The tagged O3 simulation allows you to use archived ozone production and loss rates to perform a simulation for geographically tagged ozone tracers without having to run the full-chemistry simulation. The tagged O3 simulation is also used to spin up the ozone into steady-state when validating a new meterorolgical field product.


We now prefer to refer to this simulation as the "Tagged O3 Simulation" instead of the "Tagged Ox Simulation". This reflects the removal of the Ox tracer from GEOS-Chem v9-02 and higher versions. Ox has now been replaced by O3.

--Bob Y. 11:08, 11 April 2014 (EDT)

Types of tagged O3 simulations

You may perform two different types of tagged O3 simulations. These simulations differ in the number of tagged O3 tracers that are available:

Simple tagged O3 simulation

The default setting is the SIMPLE TAGGED O3 SIMULATION, which carries 2 tracers:

(1 ) O3      : Total O3
(2 ) O3Strt  : O3 from the Stratosphere

Extended tagged O3 simulation

You may also choose to run the EXTENDED TAGGED O3 SIMULATION, which carries 13 tracers:

(1 ) O3      : Total O3
(2 ) O3Strt  : O3 from the Stratosphere      (tropopause - atm top   )
(3 ) O3Ut    : O3 produced in Upper Trop     (350 hPa    - tropopause) 
(4 ) O3Mt    : O3 produced in Middle Trop    (PBL top    - 350 hPa   )
(5 ) O3Row   : O3 produced in Rest of World  (surface    - PBL top   )
(6 ) O3PcBl  : O3 produced in Pacific BL     (surface    - PBL top   )
(7 ) O3NaBl  : O3 produced in N. American BL (surface    - PBL top   )
(8 ) O3AtBl  : O3 produced in Atlantic BL    (surface    - PBL top   )
(9 ) O3EuBl  : O3 produced in European BL    (surface    - PBL top   )
(10) O3AfBl  : O3 produced in N. African BL  (surface    - PBL top   )
(11) O3AsBl  : O3 produced in Asian          (surface    - PBL top   )
(12) O3Init  : O3 initial conditions         (all levels             )
(13) O3USA   : O3 produced over the USA      (all levels             )

Note that in both the simple and extended simulations, the stratospheric O3 tracer is listed as tracer #2. This is necessary for compatibility with the Linoz stratospheric ozone chemistry mechanism.

--Bob Y. 11:38, 11 April 2014 (EDT)

Modifications to the tagged O3 simulation

European grid definition bug fix

This update was validated in the 1-month benchmark simulation v11-01d (approved 12 Dec 2015).

There is an error in the European grid definition within tagged_ox_mod.F in v10-01. Please see the tagged ozone simulation wiki page for details.The longitude definition of ITS_A_EUR is incorrectly defined as greater than -15.0 and greater than or equal to 55.0, and thus has no upper bound. It should instead have an upper bound of 55.0. If running the extended tagged ozone simulation, you should amend the definition to be as follows:

ITS_IN_EUR = ( Y >=  36.0 .and. ( X >  -15.0 .and. X <=   55.0 ) )

--Lizzie Lundgren (talk) 14:12, 28 September 2015 (UTC)
--Bob Yantosca (talk) 17:50, 8 January 2016 (UTC)

Make it easier to switch between the simple and extended simulations

This update was validated in the 1-month benchmark simulation v10-01c (approved on 29 May 2014).

If you wish to activate the EXTENDED TAGGED O3 SIMULATION, then look for this line of code at the top of module GeosCore/tagged_ox_mod.F:


and remove the ! comment character, so that the line now looks like this:


Then make realclean and recompile GEOS-Chem, etc.

--Bob Y. 17:04, 30 May 2014 (EDT)
--Bob Yantosca (talk) 17:51, 8 January 2016 (UTC)

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