Transport Working Group: Difference between revisions

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== Transport Tracers simulation ==
<span style="color:green">'''''This update was included in [[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]], which was released on 19 Feb 2019.'''''</span>
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 [https://gmi.gsfc.nasa.gov/uploads/files/gmi_tracersuite.pdf 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 [[#Implementation in GEOS-Chem|instructions below]].
The current and future proposed transport tracers are summarized below.
{| border=1 cellspacing=0 cellpadding=5
|-bgcolor="#CCCCCC"
!width="200px"|Tracer name in GEOS-Chem
!width="100px"|Tracer name in GEOS / GMI
!width="400px"|Description
!width="150px"|Version added
|-valign="top"
|Rn222
|Rn222
|Radon-222 nuclide
*See our Rn-Pb-Be wiki page for information on [[Rn-Pb-Be_simulation#Sources|sources]] and [[Rn-Pb-Be_simulation#Sinks|sinks]]
*Used to evaluate convection over land and strat-trop exchange
|GEOS-Chem v2-02
|-valign="top"
|Pb210
|Pb210
|Lead-210 nuclide
*See our Rn-Pb-Be wiki page for information on [[Rn-Pb-Be_simulation#Sources|sources]] and [[Rn-Pb-Be_simulation#Sinks|sinks]]
*Used to evaluate wet scavenging and transport
|GEOS-Chem v2-02
|-valign="top"
|Pb210Strat
|Pb210Strat
|Lead-210 produced in the stratosphere
*See our Rn-Pb-Be wiki page for information on [[Rn-Pb-Be_simulation#Sources|sources]] and [[Rn-Pb-Be_simulation#Sinks|sinks]]
*Used to evaluate strat-trop exchange
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|Be7
|Be7
|Beryllium-7 nuclide
*See our Rn-Pb-Be wiki page for information on [[Rn-Pb-Be_simulation#Sources|sources]] and [[Rn-Pb-Be_simulation#Sinks|sinks]]
*Used to evaluate wet scavenging and strat-trop exchange
|[http://acmg.seas.harvard.edu/geos/geos_versions.html GEOS-Chem v2-02]
|-valign="top"
|Be7Strat
|Be7Strat
|Berylium-7 produced in the stratosphere
*Used to evaluate strat-trop exchange
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|Be10
|Be10
|Beryllium-10 nuclide
*Used to evaluate wet scavenging and strat-trop exchange
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|Be10Strat
|Be10Strat
|Beryllium-10 produced in the stratosphere
*Used to evaluate strat-trop exchange
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|SF6tracer
|SF6
|Sulfur hexafluoride with anthropogenic emissions from [[EDGAR_v4.2_anthropogenic_emissions|EDGAR v4.2]]
*Used to evaluate inter-hemispheric transport of anthropogenic emissions
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|COAnthroEmis25dayTracer
|CO_25
|CO tracer with anthropogenic emissions from [[CEDS_anthropogenic_emissions|CEDS]] and a 25-day lifetime
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|COAnthroEmis50dayTracer
|CO_50
|CO tracer with anthropogenic emissions from [[CEDS_anthropogenic_emissions|CEDS]] and a 50-day lifetime
|[[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|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#12.2.0|GEOS-Chem 12.2.0]]
|-valign="top"
|TBD
|nh_5
|Northern Hemisphere 5 day tracer
|TBD
|-valign="top"
|TBD
|nh_50
|Northern Hemisphere 50 day tracer
|TBD
|-valign="top"
|TBD
|sh_5
|Southern Hemisphere 5 day tracer
|TBD
|-valign="top"
|TBD
|sh_50
|Southern Hemisphere 50 day tracer
|TBD
|-valign="top"
|TBD
|ntr_5
|Northern Hemisphere Subtropical 5 day tracer
|TBD
|-valign="top"
|TBD
|ntr_50
|Northern Hemisphere Subtropical 50 day tracer
|TBD
|-valign="top"
|TBD
|str_5
|Southern Hemisphere Subtropical 5 day tracer
|TBD
|-valign="top"
|TBD
|str_50
|Southern Hemisphere Subtropical 50 day tracer
|TBD
|-valign="top"
|TBD
|tr_5
|Tropical 5 day tracer
|TBD
|-valign="top"
|TBD
|tr_50
|Tropical 50 day tracer
|TBD
|-valign="top"
|TBD
|st80_25
|Stratospheric source 25 day tracer
|TBD
|-valign
|TBD
|oNpbl
|[[#Origin tracers|Origin tracer]] for 45N-90N and surface to ~800 hPa
|TBD
|-valign
|TBD
|oSpbl
|[[#Origin tracers|Origin tracer]] for 45S-90S and surface to ~800 hPa
|TBD
|-valign
|TBD
|oStrat
|[[#Origin tracers|Origin tracer]] for the stratosphere
|TBD
|}
=== Implementation in GEOS-Chem ===
Several of the GEOS tracers listed above have been added as [[HEMCO_examples#Passive_species|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
<span style="color:green">Species name            : SF6tracer
Species name            : CH3Itracer
Species name            : COAnthroEmis25dayTracer
Species name            : COAnthroEmis50dayTracer
Species name            : COUniformEmis25dayTracer
Species name            : GlobEmis90dayTracer
Species name            : NHEmis90dayTracer
Species name            : SHEmis90dayTracer</span>
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
<span style="color:green">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</span>
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 <tt>Transport</tt> 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',
::
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|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'', <u>J. Geophys. Res. Atmos.</u>, 118, 1459–1470, doi:10.1002/jgrd.50133.
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:42, 23 February 2018 (UTC)

Revision as of 19:36, 31 May 2023

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