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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--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

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 isotope
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate convection over land and strat-trop exchange
GEOS-Chem v2-02
Pb210 Pb210 Lead-210 isotope
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate convection over land and strat-trop exchange
GEOS-Chem v2-02
Pb210Strat Pb210Strat Lead-210 produces in the stratosphere
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate convection over land and strat-trop exchange
GEOS-Chem 12.2.0
Be7 Be7 Beryllium-7 isotope
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate strat-trop exchange
GEOS-Chem v2-02
Be7Strat Be7Strat Berylium-7 produced in the stratosphere
  • Used to evaluate strat-trop exchange
GEOS-Chem 12.2.0
Be10 Be10 Beryllium-10 isotope
  • Used to evaluate strat-trop exchange
GEOS-Chem 12.2.0
Be10Strat Be10Strat Beryllium-10 produced in the stratosphere
  • Used to evaluate strat-trop exchange
GEOS-Chem 12.2.0
PassiveTracer N/A Passive tracer with initial concentration of 100 ppb (no emissions or decay)
  • Used to evaluate mass conservation in transport
GEOS-Chem 12.2.0
SF6tracer SF6 Sulfur hexafluoride with anthropogenic emissions from EDGAR v4.2
  • Used to evaluate inter-hemispheric transport of anthropogenic emissions
GEOS-Chem 12.2.0
CH3Itracer CH3I Methyl iodide with emissions over the oceans of 1 molec/cm2/s and a 5-day lifetime
  • Used to evaluate marine convection
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
  • Used for evaluating tropospheric mixing
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]
  • Used for evaluating residual circulation and mixing
  • Not implemented in GEOS-Chem as a tracer, but as a field in State_Met that is saved out via HISTORY.rc
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)