Difference between revisions of "Transport Working Group"

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!width="300px" bgcolor="#CCCCCC"|Transport Working Group Co-Chairs
 
!width="300px" bgcolor="#CCCCCC"|Transport Working Group Co-Chairs
 
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*[mailto:andrea.m.molod@nasa.gov Andrea Molod] and
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*[https://www.cira.colostate.edu/staff/schuh-andrew/ Andrew Schuh] (Github: [https://github.com/aschuh @aschuh])
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*[http://research.nianet.org./~hyl/ Hongyu Liu]
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*[https://science.larc.nasa.gov/people/katherine-travis/ Katie Travis] (Github: [https://github.com/ktravis213 @ktravis213])
  
 
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*Click on '''Leave this group'''
 
*Click on '''Leave this group'''
 
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--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:38, 21 August 2015 (UTC)
 
  
 
== Current GEOS-Chem Transport Projects (please add yours!) ==
 
== Current GEOS-Chem Transport Projects (please add yours!) ==
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!width="600px"|Description
 
!width="600px"|Description
 
!width="300px"|Contact Person
 
!width="300px"|Contact Person
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|NASA GMAO<br>Harvard
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|Model inter-comparison of transport (GEOS, GCHP, GCClassic)
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|Emma Knowland<br>Lizzie Lundgren
  
 
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|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]
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|Harvard
 
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|Examining the effect of grid resolution on vertical transport and convective mass fluxes
 
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|[mailto:karenyu@g.harvard.edu Karen Yu]
 
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|Harvard
 
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|Quantifying the impact of numerical diffusion on plume transport and comparing to observed atmospheric diffusion
 
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|[mailto:seastham@fas.harvard.edu Sebastian D. Eastham]
 
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|Harvard
 
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|Assessing the co-benefits of increasing vertical and horizontal grid resolutions for tracer transport
 
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|[mailto:jiaweizhuang@g.harvard.edu Jiawei Zhuang]
 
  
 
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|NIA / NASA Langley
 
|NIA / NASA Langley
 
|Constraints on Precipitation Scavenging and Transport of Soluble Trace Species From Airborne and Surface Radionuclide (222Rn, 210Pb, 7Be, 10Be) Observations
 
|Constraints on Precipitation Scavenging and Transport of Soluble Trace Species From Airborne and Surface Radionuclide (222Rn, 210Pb, 7Be, 10Be) Observations
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|[mailto:bo.zhang@nianet.org Bo Zhang] [mailto:hongyu.liu-1@nasa.gov Hongyu Liu]
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|[mailto:bo.zhang@nianet.org Bo Zhang]<br>[mailto:hongyu.liu-1@nasa.gov Hongyu Liu]
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|Harvard
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|Vertical resolution needs for GEOS-Chem global transport
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|[[User:Ada Shaw|Ada Shaw]]
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|Harvard<br>U. Toronto
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|Re-diagnosed convection in off-line GEOS-Chem
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|[[User:Bmy|Bob Yantosca]]<br>Tailong He
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== Common set of tracers in GEOS-Chem and GEOS ==
 
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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.
 
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'''''Hongyu Liu wrote:'''''
 
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:Andrea and I would like to seek your comment on the effort needed to implement additional tracers in GCC and GCHP. See below for the [[#List of tracers in GEOS|list of tracers in GEOS]] that Andrea sent earlier. 
 
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:It would be straightforward to implement all these tracers in GCHP. Per Andrea, all we need to do is to download some additional code (called the tracer gridded component "Tracer_GridComp" in GEOS). 
 
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:If we want the same tracer suites in GCC (e.g., an extension of current [[Rn-Pb-Be_simulation|radionuclide tracers]], simulation type "1") as in GCHP, how much effort would it be? Is there any practical reason that a reduced number of tracers is preferred in GCC?
 
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'''''[[User:Bmy|Bob Yantosca]] replied:'''''
 
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:It looks as if most of these are passive species with a fixed atmospheric lifetime, right?  If so, then it is very straightforward to add these to any GEOS-Chem simulation.  See our [[HEMCO examples#Passive_species|instructions for adding passive species to GEOS-Chem]].
 
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:So basically in the passive species menu of input.geos you would list the names of each passive species, its default concentrations, and atmospheric lifetime is.  If the species has an emissions flux, you can specify that with a corresponding entry in the HEMCO_Config.rc file, as described on the wiki.
 
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:I think the only modification we might need to make is that you are currently limited to 20 passive species but that is easy to extend by just changing a parameter value.
 
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--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:42, 23 February 2018 (UTC)
 
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=== List of tracers in GEOS ===
 
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17 GMI tracers: https://gmi.gsfc.nasa.gov/uploads/files/gmi_tracersuite.pdf
 
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Additional Tracers in GEOS - used in part to get an age spectrum
 
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# Name    Units        Long Name
 
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# -----    ------      --------------------------------
 
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nh_5      'mol mol-1'  Northern Hemisphere 5 day tracer
 
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nh_50    'mol mol-1'  Northern Hemisphere 50 day tracer
 
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sh_5      'mol mol-1'  Southern Hemisphere 5 day tracer
 
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sh_50    'mol mol-1'  Southern Hemisphere 50 day tracer
 
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ntr_5    'mol mol-1'  Northern Hemisphere Subtropical 5 day tracer
 
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ntr_50    'mol mol-1'  Northern Hemisphere Subtropical 50 day tracer
 
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str_5    'mol mol-1'  Southern Hemisphere Subtropical 5 day tracer
 
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str_50    'mol mol-1'  Southern Hemisphere Subtropical 50 day tracer
 
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tr_5      'mol mol-1'  Tropical 5 day tracer
 
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tr_50    'mol mol-1'  Tropical 50 day tracer
 
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e90      'mol mol-1'  Constant emission 90 day tracer
 
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e90_n    'mol mol-1'  Constant emission Northern Hemisphere 90 day tracer
 
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e90_s    'mol mol-1'  Constant emission Southern Hemisphere 90 day tracer
 
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st80_25  'mol mol-1'  Stratospheric source 25 day tracer
 
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aoa_nh    'days'        Age of air tracer (Northern Hemisphere surface source)
 
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::
 
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and a few others
 
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CH3I      'mol mol-1'  Methyl iodide
 
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st80_25  'mol mol-1'  Stratosphere source 25 day tracer
 
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CO_50_na  'mol mol-1'  Anthro CO North America 50 day tracer
 
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--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:42, 23 February 2018 (UTC)
 
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=== Tracer suggestions ===
 
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'''''Chris Holmes wrote:'''''
 
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: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.
 
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: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.
 
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:'''Reference'''
 
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: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.
 
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--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:42, 23 February 2018 (UTC)
 

Latest revision as of 22:51, 19 September 2023

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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Current GEOS-Chem Transport Projects (please add yours!)

User Group Description Contact Person
NASA GMAO
Harvard 		Model inter-comparison of transport (GEOS, GCHP, GCClassic) Emma Knowland
Lizzie Lundgren
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
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
Add yours here!    

Current GEOS-Chem Transport Issues

Text to be added

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