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#[[Aerosol-only simulation]] | |||
#[[CH4 simulation]] | |||
#[[CO2 simulation]] | |||
#[[Metals simulation]] | |||
#[[Mercury|Hg simulation]] | |||
#[[POPs simulation]] | |||
#[[Tagged CO simulation]] | |||
#[[Tagged O3 simulation]] | |||
#<span style="color:blue">'''TransportTracers simulation'''</span> | |||
This page contains information about the TransportTracers (formerly Rn-Pb-Be) simulation in GEOS-Chem. | |||
== Overview == | |||
The Rn-Pb-Be simulation in GEOS-Chem was based on that of the old Harvard/GISS CTM model. The current simulation follows [http://acmg.seas.harvard.edu/publications/2001/liu2001.pdf Liu et al (2001)]. | |||
In [[GEOS-Chem 12#12.2.0|GEOS-Chem 12.2.0]] the Rn-Pb-Be simulation was extended to include additional passive species for benchmarking purposes and for diagnosing transport in GEOS-Chem. At this time the simulation was renamed to the '''''TransportTracer simulation'''''. | |||
In [[GEOS-Chem 14.2.0]] the TransportTracers simulation was further modified so that species names and definitions are now consistent with GMAO's tracer gridded component (aka TR_GridComp). This will facilitate comparison of transport within GEOS-Chem, GCHP, and GEOS. | |||
== | === List of species === | ||
The | The transport tracers are summarized below. | ||
{| border=1 cellspacing=0 cellpadding=5 | |||
# | |-bgcolor="#CCCCCC" | ||
!width="100px"|Species name | |||
!width="200px"|Description | |||
!width="300px"|Source | |||
!width="300px"|Sink | |||
!width="300px"|Purpose | |||
|-valign="top" | |||
|Rn222 | |||
|Radon-222 isotope | |||
| | |||
*Emitted naturally from soils based on [https://acp.copernicus.org/articles/21/1861/2021/ Zhang et al., 2021]. | |||
| | |||
*Half-life of 3.83 days (Liu at al., 2001). | |||
**Decays into Pb<sup>210</sup> according to the exponential law: | |||
::<tt>EXP( -ΔT * 2.097d-6 )</tt> | |||
|Used to evaluate convection over land and strat-trop exchange | |||
= | |-valign="top" | ||
|Pb210 | |||
|Lead-210 isotope | |||
| | |||
*Radioactive decay from Rn<sup>222</sup> according to the exponential law: | |||
::<tt>EXP( -ΔT * 2.097d-6 )</tt> | |||
::Where ΔT is the emission timestep in seconds. | |||
| | |||
*Half-life of 22.3 years (Liu et al., 2001). | |||
**Decays according to the exponential law: | |||
::<tt>EXP( -ΔT * 9.725d-10 )</tt> | |||
*Wet deposition | |||
*Dry deposition | |||
|Used to evaluate wet scavenging and transport | |||
|-valign="top" | |||
|Pb210s | |||
|Lead-210 isotope stratospheric-source tracer | |||
| | |||
*Same as Pb210 (restricted to the stratosphere) | |||
| | |||
*Same as Pb210 | |||
|Used to evaluate strat-trop exchange | |||
|-valign="top" | |||
|Be7 | |||
|Beryllium-7 isotope | |||
| | |||
*Produced by cosmic rays as described in [https://link.springer.com/chapter/10.1007/978-3-642-46079-1_7 Lal and B. Peters, 1967] | |||
*Plus the following modifications from Liu et al. (2001): | |||
#Replace data at (0 hPa altitude, 70°S latitude) following Koch (1996): | |||
#*old value = <tt>3000 disintegrations/g air/s</tt> | |||
#*new value = <tt>1900 disintegrations/g air/s</tt> | |||
#The original Lal & Peters data ended at 70°S | |||
#*Copy the data values at 70°S to 80°S and 90°S at all levels | |||
| | |||
*Half-life of 53.3 days (Liu et al., 2001). | |||
**Decays according to the exponential law: | |||
::<tt>EXP( -ΔT * 1.506d-7 )</tt> | |||
*Wet deposition | |||
*Dry deposition | |||
|Used to evaluate wet scavenging and strat-trop exchange | |||
|-valign="top" | |||
|Be7s | |||
|Beryllium-7 isotope stratospheric source tracer | |||
| | |||
*Same as Be7 (restricted to the stratosphere) | |||
| | |||
*Same as Be7 | |||
|Used to evaluate strat-trop exchange | |||
|-valign="top" | |||
|Be10 | |||
|Beryllium-10 isotope | |||
| | |||
*Be<sup>10</sup> has an identical source distribution as Be<sup>7</sup> following Koch and Rind (1998). | |||
| | |||
*Half-life of 5.84e8 days (Koch and Rind, 1998). | |||
**Decays according to the exponential law: | |||
::<tt>EXP( -ΔT * 1.506d-7 )</tt> | |||
*Wet deposition | |||
*Dry deposition | |||
|Used to evaluate wet scavenging and strat-trop exchange | |||
= | |-valign="top" | ||
|Be10s | |||
|Beryllium-10 isotope stratospheric source tracer | |||
| | |||
*Same as Be10 (restricted to the stratosphere) | |||
| | |||
*Same as Be10 | |||
|Used to evaluate strat-trop exchange | |||
|-valign="top" | |||
|PassiveTracer | |||
|Passive tracer with initial concentration of 100 ppb | |||
| | |||
*None | |||
| | |||
*None | |||
|Used to evaluate mass conservation in transport | |||
= | |-valign="top" | ||
|SF6 | |||
|Sulfur hexafluoride | |||
| | |||
*Anthropogenic emissions from EDGAR v4.2 | |||
| | |||
*None | |||
|Used to evaluate inter-hemispheric transport of anthropogenic emissions | |||
|-valign="top" | |||
|CH3I | |||
|Methyl iodide | |||
| | |||
*Emissions over the oceans of 1 molec/cm2/s | |||
| | |||
*5-day e-folding lifetime | |||
|Used to evaluate marine convection | |||
|-valign="top" | |||
|- | |CO_25 | ||
|Anthropogenic CO 25-day tracer | |||
| | |||
*Emissions from CEDS v2 | |||
| | |||
*25-day e-folding lifetime | |||
| | |||
| | |||
| | | | ||
-- | |-valign="top" | ||
|CO_50 | |||
|Anthropogenic CO 50-day tracer | |||
| | |||
*Emissions from CEDS v2 | |||
| | |||
*50-day e-folding lifetime | |||
| | |||
= | |-valign="top" | ||
|e90 | |||
|Constant burden 90-day tracer | |||
| | |||
*Emitted globally at the surface such that the mixing ratio is maintained at 100 ppbv | |||
| | |||
*90-day e-folding lifetime | |||
| | |||
|-valign="top" | |||
|e90_n | |||
|Constant burden Northern Hemisphere 90-day tracer | |||
| | |||
*Emitted at the surface such that the mixing ratio is maintained at 100 ppbv. Emissions source is restricted to 40N - 90N. | |||
| | |||
*90-day e-folding lifetime | |||
| | |||
|-valign="top" | |||
|- | |e90_s | ||
|Constant burden Southern Hemisphere 90-day tracer | |||
| | |||
*Emitted at the surface such that the mixing ratio is maintained at 100 ppbv. Emissions source is restricted to 90S - 40S. | |||
| | |||
*90-day e-folding lifetime | |||
| | |||
| | |||
|- | |||
| | |||
| | |||
| | |||
- | |-valign="top" | ||
|aoa | |||
|Age of air uniform source tracer | |||
| | |||
*Increases by a value of 1 each emissions timestep | |||
| | |||
*Sink at the surface | |||
|Used for evaluating residual circulation and mixing | |||
= | |-valign="top" | ||
|aoa_bl | |||
|Age of air uniform source tracer with sink restricted to the boundary layer | |||
| | |||
*Increases by a value of 1 each emissions timestep | |||
| | |||
*Sink in the boundary layer | |||
|Used for evaluating residual circulation and mixing | |||
|-valign="top" | |||
|aoa_nh | |||
|Age of air uniform source tracer with sink restricted to a zone in the Northern Hemisphere | |||
| | |||
*Increases by a value of 1 each emissions timestep | |||
| | |||
*Sink at 30N - 50N | |||
|Used for evaluating residual circulation and mixing | |||
= | |-valign="top" | ||
|nh_5 | |||
|Northern Hemisphere 5-day tracer | |||
| | |||
*Constant source of 100 ppbv at latitudes 30N - 50N | |||
| | |||
*5-day e-folding lifetime | |||
| | |||
= | |-valign="top" | ||
|nh_50 | |||
|Northern Hemisphere 50-day tracer | |||
| | |||
*Constant source of 100 ppbv at latitudes 30N - 50N | |||
| | |||
*50-day e-folding lifetime | |||
| | |||
|-valign="top" | |||
|st80_25 | |||
|Stratospheric source 25-day tracer | |||
| | |||
*Constant source of 200 ppbv above 80 hPa | |||
| | |||
*25-day e-folding lifetime | |||
| | |||
|} | |||
=== | == References == | ||
#Liu, H., D. Jacob, I. Bey, and R.M. Yantosca, ''Constraints from <sup>210</sup>Pb and <sup>7</sup>Be on wet deposition and transport in a global three-dimensional chemical tracer model driven by assimilated meteorological fields'', <u>J. Geophys. Res</u>, '''106''', D11, 12109-12128, 2001. | |||
#Jacob et al., ''Evaluation and intercomparison of global atmospheric transport models using <sup>222</sup>Rn and other short-lived tracers'', <u>J. Geophys. Res</u>, '''102''', 5953-5970, 1997. | |||
#Koch, D.M., D.J. Jacob, and W.C. Graustein, ''Vertical transport of tropospheric aerosols as indicated by <sup>7</sup>Be and <sup>210</sup>Pb in a chemical tracer model'', <u>J. Geophys. Res</u>, '''101''', D13, 18651-18666, 1996. | |||
#Koch, D., and D. Rind, ''Beryllium 10/beryllium 7 as a tracer of stratospheric transport'', <u>J. Geophys. Res.</u>, '''103''', D4, 3907-3917, 1998. | |||
#Lal, D., and B. Peters, ''Cosmic ray produced radioactivity on the Earth''. <u>Handbuch der Physik</u>, '''46/2''', 551-612, edited by K. Sitte, Springer-Verlag, New York, 1967. | |||
--[[ | ---- | ||
'''''[[Tagged O3 simulation|Previous]] | [[Guide to GEOS-Chem simulations|Next]] | [[Guide to GEOS-Chem simulations]]''''' |
Latest revision as of 16:08, 21 May 2024
Previous | Next | Guide to GEOS-Chem simulations
- Simulations using KPP-built mechanisms (carbon, fullchem, Hg)
- Aerosol-only simulation
- CH4 simulation
- CO2 simulation
- Metals simulation
- Hg simulation
- POPs simulation
- Tagged CO simulation
- Tagged O3 simulation
- TransportTracers simulation
This page contains information about the TransportTracers (formerly Rn-Pb-Be) simulation in GEOS-Chem.
Overview
The Rn-Pb-Be simulation in GEOS-Chem was based on that of the old Harvard/GISS CTM model. The current simulation follows Liu et al (2001).
In GEOS-Chem 12.2.0 the Rn-Pb-Be simulation was extended to include additional passive species for benchmarking purposes and for diagnosing transport in GEOS-Chem. At this time the simulation was renamed to the TransportTracer simulation.
In GEOS-Chem 14.2.0 the TransportTracers simulation was further modified so that species names and definitions are now consistent with GMAO's tracer gridded component (aka TR_GridComp). This will facilitate comparison of transport within GEOS-Chem, GCHP, and GEOS.
List of species
The transport tracers are summarized below.
Species name | Description | Source | Sink | Purpose |
---|---|---|---|---|
Rn222 | Radon-222 isotope |
|
|
Used to evaluate convection over land and strat-trop exchange |
Pb210 | Lead-210 isotope |
|
|
Used to evaluate wet scavenging and transport |
Pb210s | Lead-210 isotope stratospheric-source tracer |
|
|
Used to evaluate strat-trop exchange |
Be7 | Beryllium-7 isotope |
|
|
Used to evaluate wet scavenging and strat-trop exchange |
Be7s | Beryllium-7 isotope stratospheric source tracer |
|
|
Used to evaluate strat-trop exchange |
Be10 | Beryllium-10 isotope |
|
|
Used to evaluate wet scavenging and strat-trop exchange |
Be10s | Beryllium-10 isotope stratospheric source tracer |
|
|
Used to evaluate strat-trop exchange |
PassiveTracer | Passive tracer with initial concentration of 100 ppb |
|
|
Used to evaluate mass conservation in transport |
SF6 | Sulfur hexafluoride |
|
|
Used to evaluate inter-hemispheric transport of anthropogenic emissions |
CH3I | Methyl iodide |
|
|
Used to evaluate marine convection |
CO_25 | Anthropogenic CO 25-day tracer |
|
|
|
CO_50 | Anthropogenic CO 50-day tracer |
|
|
|
e90 | Constant burden 90-day tracer |
|
|
|
e90_n | Constant burden Northern Hemisphere 90-day tracer |
|
|
|
e90_s | Constant burden Southern Hemisphere 90-day tracer |
|
|
|
aoa | Age of air uniform source tracer |
|
|
Used for evaluating residual circulation and mixing |
aoa_bl | Age of air uniform source tracer with sink restricted to the boundary layer |
|
|
Used for evaluating residual circulation and mixing |
aoa_nh | Age of air uniform source tracer with sink restricted to a zone in the Northern Hemisphere |
|
|
Used for evaluating residual circulation and mixing |
nh_5 | Northern Hemisphere 5-day tracer |
|
|
|
nh_50 | Northern Hemisphere 50-day tracer |
|
|
|
st80_25 | Stratospheric source 25-day tracer |
|
|
References
- Liu, H., D. Jacob, I. Bey, and R.M. Yantosca, Constraints from 210Pb and 7Be on wet deposition and transport in a global three-dimensional chemical tracer model driven by assimilated meteorological fields, J. Geophys. Res, 106, D11, 12109-12128, 2001.
- Jacob et al., Evaluation and intercomparison of global atmospheric transport models using 222Rn and other short-lived tracers, J. Geophys. Res, 102, 5953-5970, 1997.
- Koch, D.M., D.J. Jacob, and W.C. Graustein, Vertical transport of tropospheric aerosols as indicated by 7Be and 210Pb in a chemical tracer model, J. Geophys. Res, 101, D13, 18651-18666, 1996.
- Koch, D., and D. Rind, Beryllium 10/beryllium 7 as a tracer of stratospheric transport, J. Geophys. Res., 103, D4, 3907-3917, 1998.
- Lal, D., and B. Peters, Cosmic ray produced radioactivity on the Earth. Handbuch der Physik, 46/2, 551-612, edited by K. Sitte, Springer-Verlag, New York, 1967.