Transport Working Group
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All users interested in the GEOS-Chem transport scheme are encouraged to subscribe to the transport email list (click on the link in the contact information section section below).
Contact information
| Transport Working Group Co-Chairs |
|
|---|---|
| Transport Working Group email list | geos-chem-transport [at] g.harvard.edu |
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Current GEOS-Chem Transport Projects (please add yours!)
| User Group | Description | Contact Person |
|---|---|---|
| U. Toronto | Assessing impact of transport biases on methane simulation and applying weak constraint 4D-Var to correct them | Ilya Stanevich |
| U. Toronto | Characterizing model transport errors using weak constraint 4D-Var | Martin Keller |
| U. Toronto | Quantifying the impact of errors in PBL mixing on CO2 | Wei Lu |
| Harvard | Examining the effect of grid resolution on vertical transport and convective mass fluxes | Karen Yu |
| Harvard | Quantifying the impact of numerical diffusion on plume transport and comparing to observed atmospheric diffusion | Sebastian D. Eastham |
| Harvard | Assessing the co-benefits of increasing vertical and horizontal grid resolutions for tracer transport | Jiawei Zhuang |
| Dalhousie | Implementation of a new PBL mixing scheme | Aaron van Donkelaar |
| NIA / NASA Langley | Constraints on Precipitation Scavenging and Transport of Soluble Trace Species From Airborne and Surface Radionuclide (222Rn, 210Pb, 7Be, 10Be) Observations | Bo Zhang Hongyu Liu |
| Harvard | Vertical resolution needs for GEOS-Chem global transport | Ada Shaw |
| Harvard U. Toronto |
Re-diagnosed convection in off-line GEOS-Chem | Bob Yantosca Tailong He |
| Add yours here! |
Current GEOS-Chem Transport Issues
Text to be added
Transport Tracers simulation
This update was included in GEOS-Chem 12.2.0, which was released on 19 Feb 2019.
The Transport Working Group proposed implementing a common set of transport tracers in GEOS-Chem for benchmarking purposes and for diagnosing transport in GEOS-Chem compared to GEOS. The GMI tracer suite is implemented via the tracer gridded component "TR_GridComp" in GEOS. In GEOS-Chem, the tracer suite has been added as an extension of the Rn-Pb-Be simulation (simulation type "1") by default, but may be added to any GEOS-Chem simulations by following the instructions below.
The current and future proposed transport tracers are summarized below.
| Tracer name in GEOS-Chem | Tracer name in GEOS / GMI | Description | Version added |
|---|---|---|---|
| Rn222 | Rn222 | Radon-222 nuclide | GEOS-Chem v2-02 |
| Pb210 | Pb210 | Lead-210 nuclide | GEOS-Chem v2-02 |
| Pb210Strat | Pb210Strat | Lead-210 produced in the stratosphere | GEOS-Chem 12.2.0 |
| Be7 | Be7 | Beryllium-7 nuclide | GEOS-Chem v2-02 |
| Be7Strat | Be7Strat | Berylium-7 produced in the stratosphere
|
GEOS-Chem 12.2.0 |
| Be10 | Be10 | Beryllium-10 nuclide
|
GEOS-Chem 12.2.0 |
| Be10Strat | Be10Strat | Beryllium-10 produced in the stratosphere
|
GEOS-Chem 12.2.0 |
| PassiveTracer | N/A | Passive tracer with initial concentration of 100 ppb (no emissions or decay)
|
GEOS-Chem 12.2.0 |
| SF6tracer | SF6 | Sulfur hexafluoride with anthropogenic emissions from EDGAR v4.2
|
GEOS-Chem 12.2.0 |
| CH3Itracer | CH3I | Methyl iodide with emissions over the oceans of 1 molec/cm2/s and a 5-day lifetime
|
GEOS-Chem 12.2.0 |
| COAnthroEmis25dayTracer | CO_25 | CO tracer with anthropogenic emissions from CEDS and a 25-day lifetime | GEOS-Chem 12.2.0 |
| COAnthroEmis50dayTracer | CO_50 | CO tracer with anthropogenic emissions from CEDS and a 50-day lifetime | GEOS-Chem 12.2.0 |
| COUniformEmis25dayTracer | Uniform | CO tracer with uniform surface emissions of 2400 Tg/yr and a 25-day lifetime
|
GEOS-Chem 12.2.0 |
| GlobEmis90dayTracer | e90 | Tracer emitted globally at the surface such that the mixing ratio is 100 ppbv and has a 90-day lifetime | GEOS-Chem 12.2.0 |
| NHEmis90dayTracer | e90_n | Tracer emitted in the Northern Hemisphere at the surface such that the mixing ratio is 100 ppbv and has a 90-day lifetime | GEOS-Chem 12.2.0 |
| SHEmis90dayTracer | e90_s | Tracer emitted in the Southern Hemisphere at the surface such that the mixing ratio is 100 ppbv and has a 90-day lifetime | GEOS-Chem 12.2.0 |
| AgeOfAir | aoa, Clock | Age of air [s]
|
GEOS-Chem 12.2.0 |
| TBD | nh_5 | Northern Hemisphere 5 day tracer | TBD |
| TBD | nh_50 | Northern Hemisphere 50 day tracer | TBD |
| TBD | sh_5 | Southern Hemisphere 5 day tracer | TBD |
| TBD | sh_50 | Southern Hemisphere 50 day tracer | TBD |
| TBD | ntr_5 | Northern Hemisphere Subtropical 5 day tracer | TBD |
| TBD | ntr_50 | Northern Hemisphere Subtropical 50 day tracer | TBD |
| TBD | str_5 | Southern Hemisphere Subtropical 5 day tracer | TBD |
| TBD | str_50 | Southern Hemisphere Subtropical 50 day tracer | TBD |
| TBD | tr_5 | Tropical 5 day tracer | TBD |
| TBD | tr_50 | Tropical 50 day tracer | TBD
|
| TBD | st80_25 | Stratospheric source 25 day tracer | TBD |
| TBD | oNpbl | Origin tracer for 45N-90N and surface to ~800 hPa | TBD |
| TBD | oSpbl | Origin tracer for 45S-90S and surface to ~800 hPa | TBD |
| TBD | oStrat | Origin tracer for the stratosphere | TBD |
Implementation in GEOS-Chem
Several of the GEOS tracers listed above have been added as passive species in GEOS-Chem. The new tracers are listed in the advected species menu of input.geos as:
%%% ADVECTED SPECIES MENU %%%:
Type of simulation : 1
Species Entries ------->: Name
Species name : Rn222
Species name : Pb210
Species name : Pb210Strat
Species name : Be7
Species name : Be7Strat
Species name : Be10
Species name : Be10Strat
Species name : PassiveTracer
Species name : SF6tracer
Species name : CH3Itracer
Species name : COAnthroEmis25dayTracer
Species name : COAnthroEmis50dayTracer
Species name : COUniformEmis25dayTracer
Species name : GlobEmis90dayTracer
Species name : NHEmis90dayTracer
Species name : SHEmis90dayTracer
In the passive species menu of input.geos, each species is defined along with the molecular weight, lifetime, default background concentration, and long name.
%%% PASSIVE SPECIES MENU %%%:
Passive species name : PassiveTracer 1.0 -1 1.0e-7 Passive_tracer_for_mass_conservation_evaluation
Passive species name : SF6Tracer 146.0 -1 1.0e-20 Sulfur_hexafluoride
Passive species name : CH3ITracer 142.0 4.32e5 1.0e-20 Methyl_iodide
Passive species name : COAnthroEmis25dayTracer 28.0 2.16e6 1.0e-20 Anthropogenic_CO_with_25day_lifetime
Passive species name : COAnthroEmis50dayTracer 28.0 4.32e6 1.0e-20 Anthropogenic_CO_with_50day_lifetime
Passive species name : COUniformEmis25dayTracer 28.0 2.16e6 1.0e-20 CO_with_uniform_emission_and_25day_lifetime
Passive species name : GlobEmis90dayTracer 1.0 7.776e6 1.0e-20 Globally_emitted_tracer_with_90day_lifetime_and_100ppbv_maintained_mixing_ratio
Passive species name : NHEmis90dayTracer 1.0 7.776e6 1.0e-20 Northern_hemisphere_emitted_tracer_with_90day_lifetime_and_100ppbv_maintained_mixing_ratio
Passive species name : SHEmis90dayTracer 1.0 7.776e6 1.0e-20 Southern_hemisphere_emitted_tracer_with_90day_lifetime_and_100ppbv_maintained_mixing_ratio
Species with an emissions flux also have a corresponding entry in the HEMCO_Config.rc file.
#============================================================================== # SF6 emissions from EDGAR v4.2 #============================================================================== 0 EDGAR_SF6 $ROOT/SF6/v2019-01/EDGAR_v42_SF6_IPCC_2.generic.01x01.nc emi_sf6 1970-2008/1-12/1/0 C xy kg/m2/s SF6Tracer - 1 1 #============================================================================== # CH3I emitted over the oceans at rate of 1 molec/cm2/s #============================================================================== 0 SRC_2D_CH3I 1.0 - - - xy molec/cm2/s CH3ITracer 1000 1 1 #============================================================================== # Anthropogenic CO 25-day and 50-day tracers #============================================================================== 0 CEDS_CO25d_ENE $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_ene 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_ENE - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5 0 CEDS_CO25d_IND $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_ind 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_IND - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5 0 CEDS_CO25d_TRA $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_tra 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_TRA - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5 0 CEDS_CO25d_RCO $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_rco 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_RCO - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5 0 CEDS_CO25d_SLV $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_slv 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_SLV - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5 0 CEDS_CO25d_WST $ROOT/CEDS/v2018-08/$YYYY/CO-em-anthro_CMIP_CEDS_$YYYY.nc CO_wst 1950-2014/1-12/1/0 C xy kg/m2/s COAnthroEmis25dayTracer 26 1/2/12 5 0 CEDS_CO50d_WST - - - - - - COAnthroEmis50dayTracer 26 1/2/12 5
#============================================================================== # CO tracer with uniform surface emission of 2400 Tg/yr #============================================================================== 0 SRC_2D_COUniform25d 1.5e-7 - - - xy kg/m2/s COUniformEmis25dayTracer - 1 1 ... 1000 OCEAN_MASK $METDIR/$CNYR/01/$MET.$CNYR0101.CN.$RES.$NC FROCEAN 2000/1/1/0 C xy 1 1 -180/-90/180/90
To save out the AgeOfAir field, make sure Transport is uncommented in your list of collections at the top of HISTORY.rc.
#============================================================================== # %%%%% THE Transport COLLECTION %%%%% # # Diagnostics for evaluating transport, including age of air [s] # # Available for all simulations #============================================================================== Transport.template: '%y4%m2%d2_%h2%n2z.nc4', Transport.format: 'CFIO', Transport.frequency: 'End', Transport.duration: 'End', Transport.mode: 'instantaneous' Transport.fields: 'Met_AgeOfAir ', 'GIGCchem', ::
--Melissa Sulprizio (talk) 13:12, 4 January 2019 (UTC)
Origin tracers
Chris Holmes wrote:
- Another tracer suggestion: I like and use the "origin" tracers defined by Clara Orbe et al. (2013). These tracers give the fraction of air that that originates in specified source regions.
- In addition to diagnosing transport, I think the tracers will be useful as templates for users to modify for their own purposes (e.g. customizing source regions). For that reason, a comprehensive set of tracers would be useful, if they can be optional.
- Reference
- Orbe, C., M. Holzer, L. M. Polvani, and D. Waugh (2013), Air-mass origin as a diagnostic of tropospheric transport, J. Geophys. Res. Atmos., 118, 1459–1470, doi:10.1002/jgrd.50133.
--Melissa Sulprizio (talk) 18:42, 23 February 2018 (UTC)