Difference between revisions of "Transport Working Group"

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(Current GEOS-Chem Transport Projects (please add yours!))
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{| border=1 cellspacing=0 cellpadding=5
 
{| border=1 cellspacing=0 cellpadding=5
|-
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|'''Transport Working Group Co-Chairs'''
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|-valign="top"
|[mailto:dbj@atmosp.physics.utoronto.ca Dylan Jones] and [mailto:Steven.Pawson@nasa.gov Steven Pawson]
+
!width="300px" bgcolor="#CCCCCC"|Transport Working Group Co-Chairs
|-
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|width="600px"|
|'''Transport Working Group email list'''
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*[https://sciences.gsfc.nasa.gov/sed/bio/clara.orbe Clara Orbe]
|<tt>geos-chem-transport@seas.harvard.edu</tt>
+
*[https://www.cira.colostate.edu/staff/schuh-andrew/ Andrew Schuh] (Github: [https://github.com/aschuh @aschuh])
|-
+
*[https://science.larc.nasa.gov/people/katherine-travis/ Katie Travis] (Github: [https://github.com/ktravis213 @ktravis213])
|'''To subscribe to email list'''
+
 
|Send email to [mailto:geos-chem-transport-join@seas.harvard.edu <tt>geos-chem-transport-join@seas.harvard.edu</tt>]
+
|-valign="top"
|-
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!bgcolor="#CCCCCC"|Transport Working Group email list
|'''To unsubscribe from email list'''
+
|<tt>geos-chem-transport [at] g.harvard.edu</tt>
|Send email to [mailto:geos-chem-transport-leave@seas.harvard.edu <tt>geos-chem-transport-leave@seas.harvard.edu</tt>]
+
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|To subscribe to email list
 +
|Either
 +
*Send an email to <tt>geos-chem-transport+subscribe [at] g.harvard.edu</tt>
 +
Or
 +
*Go to [https://groups.google.com/a/g.harvard.edu/forum/#!forum/geos-chem-transport GEOS-Chem Transport Google Group]
 +
*Click on '''Subscribe to this group'''
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|To unsubscribe from email list
 +
|Either
 +
*Send an email to <tt>geos-chem-transport+unsubscribe [at] g.harvard.edu</tt>
 +
Or
 +
*Go to the [https://groups.google.com/a/g.harvard.edu/forum/#!forum/geos-chem-transport GEOS-Chem Transport Google Group]
 +
*Click on the '''My Settings''' button
 +
*Click on '''Leave this group'''
 
|}
 
|}
  
 
== Current GEOS-Chem Transport Projects (please add yours!) ==
 
== Current GEOS-Chem Transport Projects (please add yours!) ==
 +
 
{| border=1 cellspacing=0 cellpadding=5
 
{| border=1 cellspacing=0 cellpadding=5
 
|- bgcolor="#cccccc"
 
|- bgcolor="#cccccc"
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!width="600px"|Description
 
!width="600px"|Description
 
!width="300px"|Contact Person
 
!width="300px"|Contact Person
|-
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 +
|-valign="top"
 +
|U. Toronto
 +
|Assessing impact of transport biases on methane simulation and applying weak constraint 4D-Var to correct them
 +
|[mailto:stanevich@atmosp.physics.utoronto.ca Ilya Stanevich]
 +
 
 +
|-valign="top"
 
|U. Toronto
 
|U. Toronto
 
|Characterizing model transport errors using weak constraint 4D-Var
 
|Characterizing model transport errors using weak constraint 4D-Var
| [mailto:mkeller@atmosp.physics.utoronto.ca Martin Keller]
+
|[mailto:mkeller@atmosp.physics.utoronto.ca Martin Keller]
|-
+
 
 +
|-valign="top"
 
|U. Toronto
 
|U. Toronto
 
|Quantifying the impact of errors in PBL mixing on CO2
 
|Quantifying the impact of errors in PBL mixing on CO2
| [mailto:wlu@atmosp.physics.utoronto.ca Wei Lu]
+
|[mailto:wlu@atmosp.physics.utoronto.ca Wei Lu]
|-
+
 
 +
|-valign="top"
 +
|Harvard
 +
|Examining the effect of grid resolution on vertical transport and convective mass fluxes
 +
|[mailto:karenyu@g.harvard.edu Karen Yu]
 +
 
 +
|-valign="top"
 +
|Harvard
 +
|Quantifying the impact of numerical diffusion on plume transport and comparing to observed atmospheric diffusion
 +
|[mailto:seastham@fas.harvard.edu Sebastian D. Eastham]
 +
 
 +
|-valign="top"
 +
|Harvard
 +
|Assessing the co-benefits of increasing vertical and horizontal grid resolutions for tracer transport
 +
|[mailto:jiaweizhuang@g.harvard.edu Jiawei Zhuang]
 +
 
 +
|-valign="top"
 +
|Dalhousie
 +
|Implementation of a new PBL mixing scheme
 +
|[mailto:Aaron.van.Donkelaar@dal.ca Aaron van Donkelaar]
 +
 
 +
|-valign="top"
 +
|NIA / NASA Langley
 +
|Constraints on Precipitation Scavenging and Transport of Soluble Trace Species From Airborne and Surface Radionuclide (222Rn, 210Pb, 7Be, 10Be) Observations
 +
|[mailto:bo.zhang@nianet.org Bo Zhang] [mailto:hongyu.liu-1@nasa.gov Hongyu Liu]
 +
 
 +
|-valign="top"
 +
|Harvard
 +
|Vertical resolution needs for GEOS-Chem global transport
 +
|[[User:Ada Shaw|Ada Shaw]]
 +
 
 +
|-valign="top"
 +
|Harvard<br>U. Toronto
 +
|Re-diagnosed convection in off-line GEOS-Chem
 +
|[[User:Bmy|Bob Yantosca]]<br>Tailong He
 +
 
 +
|-valign="top"
 
|Add yours here!
 
|Add yours here!
 
|&nbsp;
 
|&nbsp;
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Text to be added
 
Text to be added
 +
 +
== 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 20:35, 20 September 2022

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).

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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
  • 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 nuclide
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate wet scavenging and transport
GEOS-Chem v2-02
Pb210Strat Pb210Strat Lead-210 produced in the stratosphere
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate strat-trop exchange
GEOS-Chem 12.2.0
Be7 Be7 Beryllium-7 nuclide
  • See our Rn-Pb-Be wiki page for information on sources and sinks
  • Used to evaluate wet scavenging and 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 nuclide
  • Used to evaluate wet scavenging and 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)