Difference between revisions of "TransportTracers simulation"

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This page contains information about the Radon-Lead-Beryllium simulation in GEOS-Chem.
+
__FORCETOC__
 +
'''''[[Tagged O3 simulation|Previous]] | [[Guide to GEOS-Chem simulations|Next]] | [[Guide to GEOS-Chem simulations]]'''''
 +
#[[GEOS-Chem chemistry mechanisms|Simulations using KPP-built mechanisms (carbon, fullchem, Hg)]]
 +
#[[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>
  
−
== 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].
+
This page contains information about the TransportTracers (formerly Rn-Pb-Be) simulation in GEOS-Chem.
  
−
The standard Rn-Pb-Be simulation uses the following tracers:
+
== Overview ==
  
−
#Rn<sup>222</sup>, which is emitted naturally from soils
+
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)]. 
−
#Pb<sup>210</sup>, which is the primary decay product of Rn<sup>222</sup>
+
−
#Be<sup>7</sup>, which is produced by cosmic rays in the stratosphere and upper atmosphere
+
  
−
This simulation is most frequently used to validate the convection and advection processes in GEOS-Chem.
+
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'''''.  
  
−
<div style="color: #aa0000; background: #eeeeee;border: 3px solid red; padding: 1em; margin: auto; width: 90%; "> '''<p>Prior to [[GEOS-Chem v9-02]], the Rn-Pb-Be simulation was not compatible with the [[Boundary_layer_mixing#VDIFF|non-local PBL mixing scheme]]. If you are running the Rn-Pb-Be simulation with any version of GEOS-Chem prior to v9-02, you must select [[Boundary_layer_mixing#TURBDAY|the TURBDAY PBL mixing scheme]] for the Rn-Pb-Be simulation. [[#Non-local PBL mixing|See below]] for more information.</p><p>&mdash; Bob Yantosca, 28 May 2014</p>'''</div>
+
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.
  
−
=== Sources ===
+
=== List of species ===
  
−
The source of #Rn<sup>222</sup> is determined as follows (cf. ''Jacob et al'' [1997]):
+
The transport tracers are summarized below.
  
−
#Rn<sup>222</sup> emission poleward of 70 degrees = 0.0 [atoms/cm2/s]
+
{| border=1 cellspacing=0 cellpadding=5
−
#For latitudes 70S-60S and 60N-70N (both land & ocean), Rn<sup>222</sup> emission = 0.005 [atoms/cm2/s]
+
−
#For latitudes between 60S and 60N:
+
−
#*Rn<sup>222</sup> over land = 1 [atoms/cm2/s] over land
+
−
#*Rn<sup>222</sup> over land = 0.005 [atoms/cm2/s] over oceans
+
−
#Where the surface temperature is below 0&deg; C, reduce Rn<sup>222</sup> emissions by a factor of 3.
+
−
 
+
−
The source of Be<sup>7</sup> is taken from ''Lal and Peters'' [1967].
+
−
 
+
−
=== Sinks ===
+
−
 
+
−
The table below shows the sinks for Rn<sup>222</sup>, Pb<sup>210</sup>, and Be<sup>7</sup>.  In the equations below, &Delta;T is the emission timestep in seconds.
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5  
+
 
|-bgcolor="#CCCCCC"
 
|-bgcolor="#CCCCCC"
−
!width="100px"|Species
+
!width="100px"|Species name
−
!width="525px"|Chemical sink
+
!width="200px"|Description
−
!width="100px"|Drydep sink?
+
!width="300px"|Source
−
!width="100px"|Wetdep sink?
+
!width="300px"|Sink
 +
!width="300px"|Purpose
  
 
|-valign="top"
 
|-valign="top"
−
|Rn<sup>222</sup>
+
|Rn222
−
|Decays into Pb<sup>210</sup> according to the exponential law: &nbsp;<tt>EXP( -&Delta;T * 2.097d-6  )</tt>
+
|Radon-222 isotope
−
|no
+
|
−
|no
+
*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( -&Delta;T * 2.097d-6  )</tt>
 +
|Used to evaluate convection over land and strat-trop exchange
  
 
|-valign="top"
 
|-valign="top"
−
|Pb<sup>210</sup>
+
|Pb210
−
|Decays according to the exponential law: &nbsp;<tt>EXP( -&Delta;T * 9.725d-10 )</tt>
+
|Lead-210 isotope
−
|yes
+
|
−
|yes
+
*Radioactive decay from Rn<sup>222</sup> according to the exponential law:
 +
::<tt>EXP( -&Delta;T * 2.097d-6  )</tt>
 +
::Where &Delta;T is the emission timestep in seconds.
 +
|
 +
*Half-life of 22.3 years (Liu et al., 2001).
 +
**Decays according to the exponential law:
 +
::<tt>EXP( -&Delta;T * 9.725d-10 )</tt>
 +
*Wet deposition
 +
*Dry deposition
 +
|Used to evaluate wet scavenging and transport
  
 
|-valign="top"
 
|-valign="top"
−
|Be<sup>7</sup>
+
|Pb210s
−
|Decays according to the exponential law: &nbsp;<tt>EXP( -&Delta;T * 1.506d-7  )</tt>
+
|Lead-210 isotope stratospheric-source tracer
−
|yes
+
|
−
|yes
+
*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&deg;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&deg;S
 +
#*Copy the data values at 70&deg;S to 80&deg;S and 90&deg;S at all levels
 +
|
 +
*Half-life of 53.3 days (Liu et al., 2001).
 +
**Decays according to the exponential law:
 +
::<tt>EXP( -&Delta;T * 1.506d-7  )</tt>
 +
*Wet deposition
 +
*Dry deposition
 +
|Used to evaluate wet scavenging and strat-trop exchange
  
−
--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:48, 15 June 2015 (UTC)
+
|-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
  
−
== Non-local PBL mixing ==
+
|-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( -&Delta;T * 1.506d-7  )</tt>
 +
*Wet deposition
 +
*Dry deposition
 +
|Used to evaluate wet scavenging and strat-trop exchange
  
−
=== GEOS-Chem v9-02 ===
+
|-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
  
−
'''''This update was tested in the 1-month benchmark simulation [[GEOS-Chem_v9-02_benchmark_history#v9-02o|v9-02o]] and approved on 03 Sep 2013.'''''
+
|-valign="top"
 +
|PassiveTracer
 +
|Passive tracer with initial concentration of 100 ppb
 +
|
 +
*None
 +
|
 +
*None
 +
|Used to evaluate mass conservation in transport
  
−
Capability to use the [[Boundary_layer_mixing#VDIFF|non-local PBL mixing scheme]] was added in [[GEOS-Chem v9-02]]. Code updates were provided by [mailto:jlin5@pku.edu.cn Jintai Lin].
+
|-valign="top"
 +
|SF6
 +
|Sulfur hexafluoride
 +
|
 +
*Anthropogenic emissions from EDGAR v4.2
 +
|
 +
*None
 +
|Used to evaluate inter-hemispheric transport of anthropogenic emissions
  
−
Karen Yu evaluated the non-local PBL mixing scheme in the Rn-Pb-Be simulation using [[GEOS-5]] and [[GEOS-FP]] met fields. Please see [http://wiki.seas.harvard.edu/geos-chem/images/RnPbBe_nonlocalPBL.pdf these plots] comparing the simulation with and without the non-local PBL mixing scheme.
+
|-valign="top"
 +
|CH3I
 +
|Methyl iodide
 +
|
 +
*Emissions over the oceans of 1 molec/cm2/s
 +
|
 +
*5-day e-folding lifetime
 +
|Used to evaluate marine convection
  
−
=== GEOS-Chem v9-01-03 and earlier ===
+
|-valign="top"
−
 
+
|CO_25
−
Helen Amos discovered that the Rn-Pb-Be simulation was not compatible with non-local PBL mixing. In [[GEOS-Chem v9-01-03]] and earlier, You must use the [[Boundary_layer_mixing#TURBDAY|TURBDAY PBL mixing scheme]]. In the Chemistry Menu of input.geos:
+
|Anthropogenic CO 25-day tracer
−
 
+
−
Turn on PBL Mixing?    : T
+
−
  => Use non-local PBL?  : F
+
−
 
+
−
--[[User:Melissa Payer|Melissa Sulprizio]] 17:56, 5 August 2013 (EDT)
+
−
 
+
−
== Validation ==
+
−
 
+
−
The information was computed from 1-year Rn-Pb-Be benchmark simulations.
+
−
 
+
−
=== 1-year benchmark simulations ===
+
−
 
+
−
==== Benchmark plots ====
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5
+
−
|- bgcolor="#CCCCCC"
+
−
!width="100px"|Version
+
−
!width="900px"|Link
+
−
|-
+
−
|'''[[GEOS-Chem v9-01-02|v9-01-02]]<br>w/ GEOS-5'''
+
−
|<tt>http://wiki.seas.harvard.edu/geos-chem/index.php/Rn-Pb-Be_simulation#Comparison_plots</tt>
+
−
|-
+
−
|'''[[GEOS-Chem v9-01-03 benchmark history#v9-01-03e_2|v9-01-03e]]<br>w/ GEOS-5'''
+
−
|<tt>http://ftp.as.harvard.edu/gcgrid/geos-chem/1yr_benchmarks/v9-01-03/v9-01-03e/geos5/2005/RnPbBe/output/pdf/</tt>
+
−
|-
+
−
|'''[[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-5'''
+
−
|<tt>http://ftp.as.harvard.edu/gcgrid/geos-chem/1yr_benchmarks/v9-02/v9-02r/geos5/RnPbBe/output/pdf/</tt>
+
−
|-
+
−
|'''[[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-FP'''
+
−
|<tt>http://ftp.as.harvard.edu/gcgrid/geos-chem/1yr_benchmarks/v9-02/v9-02r/geosfp/RnPbBe/output/pdf/</tt>
+
−
|-
+
−
|'''[[GEOS-Chem_v10-01 benchmark_history#v10-01-public-release|v10-01]]<br>w/ GEOS-FP'''
+
−
|<tt>http://ftp.as.harvard.edu/gcgrid/geos-chem/1yr_benchmarks/v10-01/v10-01-public-release/RnPbBe/output/</tt>
+
−
|}
+
−
 
+
−
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:28, 15 June 2015 (UTC)
+
−
 
+
−
==== Budget of Pb210 ====
+
−
 
+
−
In this table we plot the budgets of Pb<sup>210</sup> obtained from 1-year benchmark simulations at 4&deg; x 5&deg; resolution done with various GEOS-Chem versions. 
+
−
 
+
−
NOTES:
+
−
*The simulations that utilized GEOS-5 met fields were done for year 2005, with a 4-year spinup. (Computed by [mailto:hongyu.liu-1@nasa.gov Hongyu Liu])
+
−
*The benchmark simulations for [[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]] were done for June 2012&ndash;May 2013, with a 2-month spinup. This was due to data availability of the [[GEOS-FP]] met fields at the time of the simulation. (Completed by [mailto:kyu@seas.harvard.edu Karen Yu])
+
−
*The simulations for [[GEOS-Chem v10-01]] and later versions utilized GEOS-FP met fields for the year 2014, with a 4=year spinup. (Completed by the [[GEOS-Chem Support Team]])
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5
+
−
|- bgcolor="#CCCCCC"
+
−
!width="200px"|Quantity
+
−
![[GEOS-Chem v8-03-02|v8-03-02]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-01|v9-01-01]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-02|v9-01-02]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-03 benchmark history#v9-01-03e_2|v9-01-03e]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-FP
+
−
![[GEOS-Chem_v10-01 benchmark_history#v10-01-public-release|v10-01]]<br>w/ GEOS-FP
+
−
|-
+
−
|Burden (g)
+
−
|298.318
+
−
|316.253
+
−
|317.884
+
−
|314.790
+
−
|305.699
+
−
|247.630
+
−
|250.912
+
−
|-
+
−
|Residence time (days)
+
−
|9.01288
+
−
|9.55568
+
−
|9.60957
+
−
|9.51050
+
−
|9.25835
+
−
|7.71356
+
−
|7.77516
+
−
|-bgcolor="#eeddee"
+
−
|Sources (g day<sup>-1</sup>)
+
−
|
+
−
|
+
 
|
 
|
−
|
+
*Emissions from CEDS v2
 
|
 
|
 +
*25-day e-folding lifetime
 
|
 
|
 +
 +
|-valign="top"
 +
|CO_50
 +
|Anthropogenic CO 50-day tracer
 
|
 
|
−
|-
+
*Emissions from CEDS v2
−
|<div align="center">from Stratosphere</div>
+
−
|0.129642
+
−
|0.129852
+
−
|0.121441
+
−
|0.128670
+
−
|0.419521
+
−
|0.143133
+
−
|0.0832825
+
−
|-
+
−
|<div align="center">within Troposphere</div>
+
−
|32.9831
+
−
|32.9831
+
−
|32.9831
+
−
|32.9831
+
−
|32.6109
+
−
|31.9904
+
−
|32.2152
+
−
|-bgcolor="#eeddee"
+
−
|Sinks (g day<sup>-1</sup>)
+
−
|
+
−
|
+
−
|
+
 
|
 
|
 +
*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
 
|
 
|
−
|-
 
−
|<div align="center">Dry Deposition</div>
 
−
|3.21013
 
−
|3.66397
 
−
|3.49208
 
−
|3.48612
 
−
|3.42747
 
−
|3.15887
 
−
|3.51910
 
−
|--
 
−
|<div align="center">Wet Deposition</div>
 
−
|29.8775
 
−
|29.4223
 
−
|29.5857
 
−
|29.5991
 
−
|29.5772
 
−
|28.9538
 
−
|28.7582
 
−
|-
 
−
|<div align="right">Stratiform</div>
 
−
|21.3283
 
−
|19.4090
 
−
|19.5148
 
−
|20.8285
 
−
|20.2059
 
−
|22.5351
 
−
|22.0207
 
−
|-
 
−
|<div align="right">Convective</div>
 
−
|8.54923
 
−
|10.0134
 
−
|10.0709
 
−
|8.77061
 
−
|9.37127
 
−
|6.41867
 
−
|6.73749
 
−
|-
 
−
|<div align="center">Radioactive decay</div>
 
−
|0.0266710
 
−
|0.0251665
 
−
|0.0268078
 
−
|0.0265495
 
−
|0.0257354
 
−
|0.0208565
 
−
|0.0211769
 
−
|}
 
  
−
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:28, 15 June 2015 (UTC)
+
|-valign="top"
−
 
+
|e90_n
−
==== Budget of Be7 ====
+
|Constant burden Northern Hemisphere 90-day tracer
−
 
+
−
In this table we plot the budgets of Be<sup>7</sup> obtained from 1-year benchmark simulations at 4&deg; x 5&deg; resolution done with various GEOS-Chem versions.
+
−
 
+
−
NOTES:
+
−
*The simulations that utilized GEOS-5 met fields were done for year 2005, with a 4-year spinup. (Computed by [mailto:hongyu.liu-1@nasa.gov Hongyu Liu])
+
−
*The benchmark simulations for [[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]] were done for June 2012&ndash;May 2013, with a 2-month spinup. This was due to data availability of the [[GEOS-FP]] met fields at the time of the simulation. (Completed by [mailto:kyu@seas.harvard.edu Karen Yu])
+
−
*The simulations for [[GEOS-Chem v10-01]] and later versions utilized GEOS-FP met fields for the year 2014, with a 4=year spinup. (Completed by the [[GEOS-Chem Support Team]])
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5
+
−
|- bgcolor="#CCCCCC"
+
−
!width="200px"|Quantity
+
−
![[GEOS-Chem v8-03-02|v8-03-02]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-01|v9-01-01]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-02|v9-01-02]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-01-03 benchmark history#v9-01-03e_2|v9-01-03e]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-5
+
−
![[GEOS-Chem v9-02 benchmark history#v9-02r|v9-02r]]<br>w/ GEOS-FP
+
−
![[GEOS-Chem_v10-01 benchmark_history#v10-01-public-release|v10-01]]<br>w/ GEOS-FP
+
−
|-
+
−
|Burden (g)
+
−
|4.31961
+
−
|4.39407
+
−
|4.39653
+
−
|4.37787
+
−
|3.49564
+
−
|3.41039
+
−
|3.98942
+
−
|-
+
−
|Residence time (days)
+
−
|33.9930
+
−
|34.8514
+
−
|34.8814
+
−
|34.6750
+
−
|27.5376
+
−
|25.9787
+
−
|30.1194
+
−
|-bgcolor="#eeddee"
+
−
|Sources (g day<sup>-1</sup>)
+
−
|
+
−
|
+
−
|
+
 
|
 
|
 +
*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.
−
|<div align="center">from Stratosphere</div>
+
−
|0.0504585
+
−
|0.0504328
+
−
|0.0504253
+
−
|0.0504472
+
−
|0.0674867
+
−
|0.0630964
+
−
|0.0512072
+
−
|-
+
−
|<div align="center">within Troposphere</div>
+
−
|0.132552
+
−
|0.132552
+
−
|0.132552
+
−
|0.132552
+
−
|0.104750
+
−
|0.112349
+
−
|0.132977
+
−
|-bgcolor="#eeddee"
+
−
|Sinks (g day<sup>-1</sup>)
+
−
|
+
−
|
+
−
|
+
 
|
 
|
 +
*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
−
|<div align="center">Dry Deposition</div>
+
|Used for evaluating residual circulation and mixing
−
|0.00808056
+
−
|0.00969345
+
−
|0.00936374
+
−
|0.00882144
+
−
|0.00881422
+
−
|0.00782526
+
−
|0.00794288
+
−
|--
+
−
|<div align="center">Wet Deposition</div>
+
−
|0.118666
+
−
|0.116060
+
−
|0.116350
+
−
|0.117156
+
−
|0.117906
+
−
|0.123206
+
−
|0.124298
+
−
|-
+
−
|<div align="right">Stratiform</div>
+
−
|0.0846774
+
−
|0.0767926
+
−
|0.0769681
+
−
|0.0858211
+
−
|0.0844566
+
−
|0.1093560
+
−
|0.1101450
+
−
|-
+
−
|<div align="right">Convective</div>
+
−
|0.0339885
+
−
|0.0392671
+
−
|0.0393817
+
−
|0.0313346
+
−
|0.0334494
+
−
|0.0138500
+
−
|0.0141529
+
−
|-
+
−
|<div align="center">Radioactive decay</div>
+
−
|0.0562636
+
−
|0.0572312
+
−
|0.0572633
+
−
|0.0570217
+
−
|0.0455165
+
−
|0.0444134
+
−
|0.0519433
+
−
|}
+
  
−
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 18:28, 15 June 2015 (UTC)
+
|-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
  
−
=== GEOS-5 vs. MERRA ===
+
|-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
  
−
As demonstrated by Liu et al. (2001), the Rn-Pb-Be simulation is a valuable tool for testing aerosol wet scavenging in the model. Here the Rn-Pb-Be simulation is used to benchmark the differences between several configurations for the current implementation of aerosol wet scavenging in v9-01-02.
+
|-valign="top"
 +
|nh_5
 +
|Northern Hemisphere 5-day tracer
 +
|
 +
*Constant source of 100 ppbv at latitudes 30N - 50N
 +
|
 +
*5-day e-folding lifetime
 +
|
  
−
[mailto:hamos@fas.harvard.edu Helen Amos] ran 4 different 1-year Rn-Pb-Be simulations to look at how Pb<sup>210</sup> wet deposition is affected by [[GEOS-5]] and [[MERRA]] meteorology:
+
|-valign="top"
−
 
+
|nh_50
−
<blockquote>
+
|Northern Hemisphere 50-day tracer
−
;'''Run 1: GEOS-5 std''': Simulation with the standard [[GEOS-Chem v9-01-02]] code, using with GEOS-5 met fields
+
−
;'''Run 2: MERRA std''': Simulation with the standard GEOS-Chem v9-01-02 code, using with MERRA met fields.  This simulation is intended to give the user a sense of the differences to expect between using MERRA and GEOS-5 meteorological fields.
+
−
;'''Run 3: MERRA met GEOS-5 wet dep''': This simulation was run using GEOS-Chem v9-01-02 with MERRA meteorological fields and the GEOS-5 wet deposition algorithms (in <tt>wetscav_mod.F</tt> and <tt>convection_mod.F</tt>). Additional fields were archived for MERRA that were not archived for GEOS-5. These additional fields for MERRA were used to update the wet scavenging algorithms (e.g. precipitation production in MAKE_QQ) in v9-01-01.  This simulation is intended to discriminate between the effects of (a) meteorological fields and (b) changes made to the wet deposition algorithms for MERRA. 
+
−
;'''Run 4: GEOS-5 w/ Wang et al. (2011) aerosol washout''': This simulation was run using v9-01-02 with GEOS-5 fields and aerosol washout updated according to Wang et al. (2011, ACPD). This simulation is intended as a preview for what to expect when the Wang et al. (2011) updates go into the standard code in v9-01-03.
+
−
</blockquote>
+
−
 
+
−
All simulations were performed using [[GEOS-Chem v9-01-02]] at 4&deg; x 5&deg; resolution for the year 2009.
+
−
 
+
−
==== Comparison plots ====
+
−
 
+
−
Helen Amos also prepared the following comparison plots from these simulations.  All results shown are for [[GEOS-Chem v9-01-02]] at 4&deg; x 5&deg; resolution for the year 2009.  Monthly averages for January and July plotted separately.
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5
+
−
|-bgcolor="#cccccc"
+
−
!Comparison
+
−
!width="75px"|
+
−
!width="75px"|
+
−
|-
+
−
|GEOS-5 standard simulation (Run 1) vs. MERRA standard simulation (Run 2)
+
−
|[[Media:f1_f2_jan_small.png|January]]
+
−
|[[Media:f1_f2_jul_small.png|July]]
+
−
|-
+
−
|GEOS-5 standard simulation (Run 1) vs. MERRA simulation w/ GEOS-5 wetdep algorithms (Run 3)
+
−
|[[Media:f1_f3_jan_small.png|January]]
+
−
|[[Media:f1_f3_jul_small.png|July]]
+
−
|-
+
−
|GEOS-5 standard simulation (Run 1) vs. GEOS-5 simulation w/ Wang et al (2011) aerosol washout (Run 4)
+
−
|[[Media:f1_f4_jan_small.png|January]]
+
−
|[[Media:f1_f4_jul_small.png|July]]
+
−
|}
+
−
 
+
−
--[[User:Bmy|Bob Y.]] 13:37, 29 November 2011 (EST)
+
−
 
+
−
==== Comparison budgets ====
+
−
 
+
−
Helen Amos also prepared the budgets from each of her 4 simulations.  These are compared to the original Rn-Pb-Be simulation as described in Liu et al (2001).
+
−
 
+
−
{| border=1 cellspacing=0 cellpadding=5
+
−
|- bgcolor="#CCCCCC"
+
−
!width="200px"|Quantity
+
−
!Liu et al<br>(2001)
+
−
!(Run 1)<br>v9-01-02<br>GEOS-5 std
+
−
!(Run 2)<br>v9-01-02<br>MERRA std
+
−
!(Run 3)<br>v9-01-02<br>MERRA met<br>GEOS-5 wetdep
+
−
!(Run 4)<br>v9-01-02<br> GEOS-5 met<br>w/ Wang<br> aerosol washout**
+
−
|-
+
−
|Burden (g)
+
−
|299
+
−
|324.42
+
−
|299.74
+
−
|334.35
+
−
|339.11
+
−
|-
+
−
|Residence time (days)
+
−
|9
+
−
|9.80
+
−
|9.05
+
−
|9.93
+
−
|10.26
+
−
|-bgcolor="#eeddee"
+
−
|Sources (g day<sup>-1</sup>)
+
−
|
+
−
|
+
−
|
+
−
|
+
−
|
+
−
|-
+
−
|<div align="center">Strat + Trop</div>
+
−
|34
+
−
|33.11
+
−
|33.13
+
−
|33.68
+
−
|33.11
+
−
|-bgcolor="#eeddee"
+
−
|Sinks (g day<sup>-1</sup>)
+
−
|
+
−
|
+
 
|
 
|
 +
*Constant source of 100 ppbv at latitudes 30N - 50N
 
|
 
|
 +
*50-day e-folding lifetime
 
|
 
|
−
|-
 
−
|<div align="center">Dry Deposition</div>
 
−
|3.8
 
−
|3.37
 
−
|3.37
 
−
|3.37
 
−
|3.68
 
  
−
|--
+
|-valign="top"
−
|<div align="center">Wet Deposition</div>
+
|st80_25
 +
|Stratospheric source 25-day tracer
 
|
 
|
−
|
+
*Constant source of 200 ppbv above 80 hPa
 
|
 
|
 +
*25-day e-folding lifetime
 
|
 
|
−
|
+
 
−
|-
+
−
|<div align="right">Stratiform</div>
+
−
|21
+
−
|18.57
+
−
|19.22
+
−
|18.93
+
−
|17.17
+
−
|-
+
−
|<div align="right">Convective</div>
+
−
|9.6
+
−
|11.14
+
−
|10.54
+
−
|11.37
+
−
|12.21
+
−
|-
+
−
|<div align="center">Radioactive decay</div>
+
−
|0.03
+
−
|0.03
+
−
|0.03
+
−
|0.00
+
−
|0.03
+
 
|}
 
|}
−
 
−
--[[User:Bmy|Bob Y.]] 13:57, 29 November 2011 (EST)
 
−
 
−
--[[User:Helen Amos|Helen Amos]] 17:56, 12 September 2012 (EST), the labels for "convective" and "stratiform" were switched. Error corrected now. Thanks to Patrick Kim for pointing it out!
 
−
 
−
<nowiki>**</nowiki>Note: In Run 4, a condensed water content value of 1.5d-6 cm<sup>3</sup> H20/cm<sup>3</sup> air was used in the calculation of F' in <tt>wetscav_mod.F</tt>. Qiaoqiao Wang updated this value to 1.0d-6 cm<sup>3</sup> H20/cm<sup>3</sup> as described in [http://acmg.seas.harvard.edu/publications/wang_qiaoqiao2011.pdf Wang et al. <nowiki>[2011]</nowiki>]. The use of 1.0d-6 increases the fraction of precipitating area, resulting in a slightly shorter lifetime of Pb210, as seen in the [[Rn-Pb-Be_simulation#Budget_of_Pb210_from_1-year_benchmark_simulations|budget of Pb210]] from the 1-year Rn-Pb-Be benchmark simulation for [[GEOS-Chem_v9-01-03_benchmark_history#v9-01-03e_2|v9-01-03e]].
 
−
 
−
--[[User:Melissa Payer|Melissa Payer]] 17:34, 24 January 2012 (EST)
 
  
 
== References ==
 
== 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'', <u>J. Geophys. Res</u>, '''106''', D11, 12,109-12,128, 2001.
+
#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 Rn-222 and other short-lived tracers'', <u>J. Geophys. Res</u>, '''102''', 5953-5970, 1997.
+
#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. <u>J. Geophys. Res</u>, '''101''', D13, 18651, 1996.
+
#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.
−
#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.  
+
#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.
−
== Previous issues that are now resolved ==
+
−
 
+
−
=== Incorrect Rn values caused by bug in convection_mod.f ===
+
−
 
+
−
[[GEOS-Chem_v8-03-02#TINY_parameter_in_convection_mod.f|The bug in convection_mod.f described here]] can cause incorrect values of Rn in [[GEOS-Chem v8-03-01]] and prior versions. This was fixed in [[GEOS-Chem v8-03-02]].
+
−
 
+
−
--[[User:Bmy|Bob Y.]] 16:17, 19 May 2011 (EDT)
+
−
 
+
−
=== Bug for ND44 diagnostic in diag3.f ===
+
−
 
+
−
'''''NOTE: This bug was issued as a post-release patch ("v9-01-01-Patch-diags") in [[GEOS-Chem v9-01-01]] and was approved on 07 Jun 2011.'''''
+
−
 
+
−
In the ND44 diagnostic section of <tt>diag3.f</tt>, the following lines are present twice (once for drydep fluxes and again for drydep velocities).  This is a special-case for some tracers in the Caltech isoprene scheme:
+
−
 
+
−
              ! Special case for tracers with several dry dep. tracers
+
−
              ! E.g. ISOPN: ISOPND and ISOPNB.
+
−
              ! We handle both tracers at the same time so we need to
+
−
              ! skip the second tracer. (ccc, 2/3/10)
+
−
              !IF ( MMB /= NN ) CYCLE
+
−
              IF ( MMB /= NN                .OR.
+
−
    &              DEPNAME( N ) == 'ISOPNB' .OR.
+
−
    &              DEPNAME( N ) == 'MVKN'      ) CYCLE
+
−
 
+
−
However, these lines will cause the drydep fluxes and velocities for Be7 to be skipped.  The fix is to bracket these lines with an IF statement so that they will only execute for a full-chemistry simulation:
+
−
 
+
−
            IF ( ITS_A_FULLCHEM_SIM() ) THEN
+
−
              ! Special case for tracers with several dry dep. tracers
+
−
              ! E.g. ISOPN: ISOPND and ISOPNB.
+
−
              ! We handle both tracers at the same time so we need to
+
−
              ! skip the second tracer. (ccc, 2/3/10)
+
−
              !IF ( MMB /= NN ) CYCLE
+
−
              IF ( MMB /= NN                .OR.
+
−
    &              DEPNAME( N ) == 'ISOPNB' .OR.
+
−
    &              DEPNAME( N ) == 'MVKN'      ) CYCLE
+
−
            ENDIF
+
−
 
+
−
--[[User:Bmy|Bob Y.]] 11:57, 7 July 2011 (EDT)
+
−
 
+
−
=== Out-of-bounds errors in ND01, ND02 diagnostics ===
+
−
 
+
−
'''''This issue was fixed in [[GEOS-Chem v9-01-02]], just prior to its release.'''''
+
−
 
+
−
In <tt>RnPbBe_mod.F</tt>, the ND01 (Source of Rn, Pb, Be) and ND02 (Decay of Rn, Pb, Be) diagnostics had [[Common GEOS-Chem error messages#Array-out-of-bounds|array-out-of-bounds errors]] if you requested less than 47 levels. 
+
−
 
+
−
For example, if you specified these settings in your <tt>input.geos</tt> file (assuming a GEOS-5 or MERRA simulation  w/ 47 levels):
+
−
 
+
−
ND01: Rn/Pb/Be source  : 47  all
+
−
ND02: Rn/Pb/Be decay    : 47  all
+
−
 
+
−
then your run would work just fine.  However, if you tried this:
+
−
 
+
−
ND01: Rn/Pb/Be source  :  1  all
+
−
ND02: Rn/Pb/Be decay    :  1  all
+
−
 
+
−
then your run would crash.  In some instances, the error masked itself as an I/O error (i.e. "file not found").  This is because an out-of-bounds was probably corrupting the variables that were used to check if all of the data had been read from a particular met field file.
+
−
 
+
−
To prevent this from happening, we now test whether the L index is smaller or equal to LD01 (the vertical extent of the AD01 array) or LD02 (the vertical extent of the AD02 array).  We have now modified all of the IF statements where the ND01 or ND02 diagnostics are invoked. 
+
−
 
+
−
For example, we took the existing block of code:
+
−
 
+
−
      ! ND01 diag: 7Be emission [kg/s]
+
−
      IF ( ND01 > 0 ) THEN
+
−
        AD01(I,J,L,3) = AD01(I,J,L,3) + ( ADD_Be / DTSRCE )
+
−
      ENDIF
+
−
 
+
−
and add an additional test on L:
+
−
 
+
−
      ! ND01 diag: 7Be emission [kg/s]
+
−
      IF ( ND01 > 0 .and. L <= LD01 ) THEN
+
−
        AD01(I,J,L,3) = AD01(I,J,L,3) + ( ADD_Be / DTSRCE )
+
−
      ENDIF
+
−
 
+
−
etc.
+
−
 
+
−
We will add this fix into [[GEOS-Chem v9-01-02]], since it does not affect the full-chemistry simulation.
+
−
 
+
−
--[[User:Bmy|Bob Y.]] 11:08, 28 November 2011 (EST)
+
−
 
+
−
=== Missing drydep diagnostics caused by tracer name error  ===
+
−
 
+
−
'''''This update was tested in the 1-month benchmark simulation [[GEOS-Chem_v9-01-03_benchmark_history#v9-01-03g|v9-01-03g]] and approved on 27 Feb 2012.'''''
+
−
 
+
−
Please use the following tracer names in <tt>input.geos</tt> when setting up a Rn-Pb-Be simulation:
+
−
 
+
−
%%% TRACER MENU %%%    :
+
−
Type of simulation      : 1
+
−
Number of Tracers      : 3                     
+
−
Tracer Entries -------> : TR#  Name  g/mole  Tracer Members; () = emitted
+
−
Tracer #1              :  1  Rn    222.0 
+
−
Tracer #2              :  2  Pb    210.0
+
−
Tracer #3              :  3  Be7      7.0
+
−
 
+
−
If you use alternate spellings for the Rn and Pb tracers, such as:
+
−
 
+
−
Tracer #1              :  1  Rn222  222.0 
+
−
Tracer #2              :  2  Pb210  210.0
+
−
 
+
−
Then this may cause the dry deposition fluxes and frequencies for Pb<sup>210</sup> not to be printed out.
+
−
 
+
−
A fix is forthcoming in [[GEOS-Chem v9-01-03]].
+
  
−
--[[User:Bmy|Bob Y.]] 11:57, 7 July 2011 (EDT)
 
  
−
== Outstanding issues ==
+
----
 +
'''''[[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

  1. Simulations using KPP-built mechanisms (carbon, fullchem, Hg)
  2. Aerosol-only simulation
  3. CH4 simulation
  4. CO2 simulation
  5. Metals simulation
  6. Hg simulation
  7. POPs simulation
  8. Tagged CO simulation
  9. Tagged O3 simulation
  10. 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
  • Half-life of 3.83 days (Liu at al., 2001).
    • Decays into Pb210 according to the exponential law:
EXP( -ΔT * 2.097d-6 )
 Used to evaluate convection over land and strat-trop exchange
Pb210 Lead-210 isotope
  • Radioactive decay from Rn222 according to the exponential law:
EXP( -ΔT * 2.097d-6 )
Where ΔT is the emission timestep in seconds.
  • Half-life of 22.3 years (Liu et al., 2001).
    • Decays according to the exponential law:
EXP( -ΔT * 9.725d-10 )
  • Wet deposition
  • Dry deposition
 Used to evaluate wet scavenging and transport
Pb210s Lead-210 isotope stratospheric-source tracer
  • Same as Pb210 (restricted to the stratosphere)
  • Same as Pb210
 Used to evaluate strat-trop exchange
Be7 Beryllium-7 isotope
  • Produced by cosmic rays as described in Lal and B. Peters, 1967
  • Plus the following modifications from Liu et al. (2001):
  1. Replace data at (0 hPa altitude, 70°S latitude) following Koch (1996):
    • old value = 3000 disintegrations/g air/s
    • new value = 1900 disintegrations/g air/s
  2. 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:
EXP( -ΔT * 1.506d-7 )
  • Wet deposition
  • Dry deposition
 Used to evaluate wet scavenging and strat-trop exchange
Be7s Beryllium-7 isotope stratospheric source tracer
  • Same as Be7 (restricted to the stratosphere)
  • Same as Be7
 Used to evaluate strat-trop exchange
Be10 Beryllium-10 isotope
  • Be10 has an identical source distribution as Be7 following Koch and Rind (1998).
  • Half-life of 5.84e8 days (Koch and Rind, 1998).
    • Decays according to the exponential law:
EXP( -ΔT * 1.506d-7 )
  • Wet deposition
  • Dry deposition
 Used to evaluate wet scavenging and strat-trop exchange
Be10s Beryllium-10 isotope stratospheric source tracer
  • Same as Be10 (restricted to the stratosphere)
  • Same as Be10
 Used to evaluate strat-trop exchange
PassiveTracer Passive tracer with initial concentration of 100 ppb
  • None
  • None
 Used to evaluate mass conservation in transport
SF6 Sulfur hexafluoride
  • Anthropogenic emissions from EDGAR v4.2
  • None
 Used to evaluate inter-hemispheric transport of anthropogenic emissions
CH3I Methyl iodide
  • Emissions over the oceans of 1 molec/cm2/s
  • 5-day e-folding lifetime
 Used to evaluate marine convection
CO_25 Anthropogenic CO 25-day tracer
  • Emissions from CEDS v2
  • 25-day e-folding lifetime
CO_50 Anthropogenic CO 50-day tracer
  • Emissions from CEDS v2
  • 50-day e-folding lifetime
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
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
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
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
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
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
nh_5 Northern Hemisphere 5-day tracer
  • Constant source of 100 ppbv at latitudes 30N - 50N
  • 5-day e-folding lifetime
nh_50 Northern Hemisphere 50-day tracer
  • Constant source of 100 ppbv at latitudes 30N - 50N
  • 50-day e-folding lifetime
st80_25 Stratospheric source 25-day tracer
  • Constant source of 200 ppbv above 80 hPa
  • 25-day e-folding lifetime

References

  1. 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.
  2. 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.
  3. 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.
  4. Koch, D., and D. Rind, Beryllium 10/beryllium 7 as a tracer of stratospheric transport, J. Geophys. Res., 103, D4, 3907-3917, 1998.
  5. 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.


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