Difference between revisions of "Transport Working Group"

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(Implementation in GEOS-Chem)
(Implementation in GEOS-Chem)
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  Species name            : PassiveTracer
 
  Species name            : PassiveTracer
 
  <span style="color:green">Species name            : SF6tracer
 
  <span style="color:green">Species name            : SF6tracer
Species name            : CH3Itracer
+
Species name            : CH3Itracer
Species name            : COtracer25days
+
Species name            : COtracer25days
Species name            : COtracer50days
+
Species name            : COtracer50days
Species name            : Emis90dayTracer
+
Species name            : Emis90dayTracer
Species name            : Emis90dayTracerNH
+
Species name            : Emis90dayTracerNH
Species name            : Emis90dayTracerSH
+
Species name            : Emis90dayTracerSH
Species name            : UniformTracer</span>
+
Species name            : UniformTracer</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.
 
In the passive species menu of input.geos, each species is defined along with the molecular weight, lifetime, default background concentration, and long name.

Revision as of 18:32, 16 January 2019

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
  • Send an email to geos-chem-transport+subscribe [at] g.harvard.edu

Or

To unsubscribe from email list Either
  • Send an email to geos-chem-transport+unsubscribe [at] g.harvard.edu

Or

--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)