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 |
| To subscribe to email list | Either
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| To unsubscribe from email list | Either
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--Bob Y. (talk) 18:38, 21 August 2015 (UTC)
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
Common set of tracers in GEOS-Chem and GEOS
This update will be included in GEOS-Chem 12.2.0.
The Transport Working Group has proposed implementing additional tracers in GEOS-Chem for benchmarking purposes and diagnosing transport in GEOS-Chem compared to GEOS-5. The list of tracers in GEOS is provided below and 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.
List of tracers in GEOS
17 GMI tracers: https://gmi.gsfc.nasa.gov/uploads/files/gmi_tracersuite.pdf
Additional Tracers in GEOS - used in part to get an age spectrum
# Name Units Long Name # ----- ------ -------------------------------- nh_5 'mol mol-1' Northern Hemisphere 5 day tracer nh_50 'mol mol-1' Northern Hemisphere 50 day tracer sh_5 'mol mol-1' Southern Hemisphere 5 day tracer sh_50 'mol mol-1' Southern Hemisphere 50 day tracer ntr_5 'mol mol-1' Northern Hemisphere Subtropical 5 day tracer ntr_50 'mol mol-1' Northern Hemisphere Subtropical 50 day tracer str_5 'mol mol-1' Southern Hemisphere Subtropical 5 day tracer str_50 'mol mol-1' Southern Hemisphere Subtropical 50 day tracer tr_5 'mol mol-1' Tropical 5 day tracer tr_50 'mol mol-1' Tropical 50 day tracer e90 'mol mol-1' Constant emission 90 day tracer e90_n 'mol mol-1' Constant emission Northern Hemisphere 90 day tracer e90_s 'mol mol-1' Constant emission Southern Hemisphere 90 day tracer st80_25 'mol mol-1' Stratospheric source 25 day tracer aoa_nh 'days' Age of air tracer (Northern Hemisphere surface source) ::
and a few others
CH3I 'mol mol-1' Methyl iodide CO_50_na 'mol mol-1' Anthro CO North America 50 day tracer
--Lizzie Lundgren (talk) 15:41, 15 June 2018 (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)
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 : COtracer25days Species name : COtracer50days Species name : Emis90dayTracer Species name : Emis90dayTracerNH Species name : Emis90dayTracerSH Species name : UniformTracer
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_eval
Passive species name : SF6tracer 146.0 1.0e11 1.0e-20 Sulfur_hexafluoride
Passive species name : CH3Itracer 142.0 4.32e5 1.0e-20 Methyl_iodide
Passive species name : COtracer25days 28.0 2.16e6 1.0e-20 Anthro_CO_25day_tracer
Passive species name : COtracer50days 28.0 4.32e6 1.0e-20 Anthro_CO_50day_tracer
Passive species name : Emis90dayTracer 1.0 7.776e6 1.0e-20 Constant_emission_tracer
Passive species name : Emis90dayTracerNH 1.0 7.776e6 1.0e-20 Constant_emission_tracer_for_NH
Passive species name : Emis90dayTracerSH 1.0 7.776e6 1.0e-20 Constant_emission_tracer_for_SH
Passive species name : UniformTracer 28.0 2.16e6 1.0e-20 CO-like_tracer_with_uniform_emission
Species with an emissions flux also have a corresponding entry in the HEMCO_Config.rc file.
#============================================================================== # SF6 emissions from EDGAR v4.2 #============================================================================== 0 EDGAR_SF6tracer $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_CH3Itracer 1.0 - - - xy molec/cm2/s CH3Itracer 1000 1 1 #============================================================================== # Anthropogenic CO 25-day and 50-day tracers #============================================================================== 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_ENE - - - - - - COtracer50days 26 1/2/12 5 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_IND - - - - - - COtracer50days 26 1/2/12 5 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_TRA - - - - - - COtracer50days 26 1/2/12 5 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_RCO - - - - - - COtracer50days 26 1/2/12 5 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_SLV - - - - - - COtracer50days 26 1/2/12 5 0 CEDS_COtrc25d_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 COtracer25days 26 1/2/12 5 0 CEDS_COtrc50d_WST - - - - - - COtracer50days 26 1/2/12 5 #============================================================================== # e90 tracer is emitted with a uniform flux of 100 ppbv #============================================================================== 0 SRC_2D_Emis90day 100 - - - xy ppbv Emis90dayTracer - 1 1 0 SRC_2D_Emis90dayNH 100 - - - xy ppbv Emis90dayTracerNH 1001 1 1 0 SRC_2D_Emis90daySH 100 - - - xy ppbv Emis90dayTracerSH 1002 1 1 #============================================================================== # Uniform surface emission of 2400 Tg/yr #============================================================================== 0 SRC_2D_Uniform 1.5e-7 - - - xy kg/m2/s UniformTracer - 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 1001 NH_MASK -180/0/180/90 - 2000/1/1/0 C xy 1 1 -180/0/180/90 1002 SH_MASK -180/-90/180/0 - 2000/1/1/0 C xy 1 1 -180/-90/180/0
--Melissa Sulprizio (talk) 13:12, 4 January 2019 (UTC)