GEOS-Chem v10-01
Contents
- 1 Overview
- 2 Previous issues now resolved in GEOS-Chem v10-01
- 2.1 Now use correct value of molecular weight for the PROPNN tracer in input.geos
- 2.2 Now use MAP_A2A to regrid 1x1 TOMS O3 to model resolution
- 2.3 Bug fix for determining when to use TOMS O3 columns
- 2.4 Fixes for the stratospheric chemistry module
- 2.5 Various updates for GEOS-Chem specialty simulations
- 2.6 Updates to speed up GEOS-Chem execution
- 2.7 Bug fixes and and updates for v10-01d
- 2.8 Reactivating dust tracers in TOMAS simulations
- 2.9 Fix for ND61 diagnostic in TOMAS simulations
- 2.10 Bug fixes and and updates for v10-01f
- 2.11 Bug fixes and and updates for v10-01g
- 2.12 Bug fixes and updates for v10-01h
- 2.13 Bug fixes and updates for v10-01i
- 2.14 Last-minute fixes prior to the GEOS-Chem v10-01 public release
- 3 Outstanding issues not yet resolved in GEOS-Chem v10-01
Overview
History
The table below shows the previous, current, and successive versions of GEOS-Chem:
Previous version | This version | Next version |
---|---|---|
GEOS-Chem v9-02 | GEOS-Chem v10-01 | TBD |
PUBLIC RELEASE 03 Mar 2014 | TBD | TBD |
View v9-02 benchmark history | View v10-01 benchmark history | TBD |
--Bob Y. 13:17, 16 January 2014 (EST)
What's new in this version
GEOS-Chem v10-01 will be released after a fixed interval of time (approxmiately 9 months after the release of the prior version, GEOS-Chem v9-02). The GEOS-Chem Steering Committee has prioritized the following updates and improvements for inclusion into GEOS-Chem v10-01. (This list is subject to change.) Updates that do not get included into GEOS-Chem v10-01 will be held over for the next version.
NOTE: v10-01a, v10-02b, etc. denote 1-month benchmark simulations, which are designed to evaluate GEOS-Chem's performance at intermediate stages of development.
v10-01a
Please see the Benchmark approval form for GEOS-Chem v10-01a for complete information about the validation of GEOS-Chem v10-01a.
Feature | Type | Submitted by | Status |
---|---|---|---|
Updates to dry deposition when using the Olson 2001 land map | Science | Patrick Kim (Harvard) | Approved 05 Feb 2014 |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01b
Please see the Benchmark approval form for GEOS-Chem v10-01b for complete information about the validation of GEOS-Chem v10-01b.
Feature | Type | Submitted by | Status |
---|---|---|---|
Now use correct molecular weight for the PROPNN tracer in input.geos | Bug fix | Jenny Fisher (U. Wollongong) | Approved 06 Mar 2014 |
Use MAP_A2A to regrid 1x1 TOMS O3 to model resolution | Structural | Jintai Lin (Peking U.) | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01c
Please see the following for complete information about the validation of GEOS-Chem v10-01c:
- Approval for 1-month benchmark simulation GEOS-Chem v10-01c
- Approval form for 1-year benchmark simulation GEOS-Chem v10-01c Run0
- Approval form for 1-year benchmark simulation GEOS-Chem v10-01c Run1
Feature | Type | Submitted by | Status |
---|---|---|---|
UCX strat chem mechanism, includes: | Science | UCX:
Sebastian Eastham (MIT) Fast-JX: Sebastian Eastham (MIT), Jingqiu Mao (Princeton) |
1-month benchmark: Approved 29 May 2014 1-year benchmark: Approved 26 Jun 2014 |
Bug fix for determining when to use TOMS O3 columns | Bug fix | GEOS-Chem Support Team | " " |
Add support for TAU performance profiler | Structural | John Linford (ParaTools, Inc.) GEOS-Chem Support Team |
" " |
Fixes for timeseries diagnostics to allow for more transported tracers | Bug fix | GEOS-Chem Support Team | " " |
Fixes for the stratospheric chemistry module | Structural | GEOS-Chem Support Team | " " |
Various updates for GEOS-Chem specialty simulations | Bug fix & Structural |
Jeff Pierce (CSU) Kevin Wecht (Harvard) Matthew Johnson (NASA) GEOS-Chem Support Team |
" " |
Updates to speed up GEOS-Chem execution | Structural | GEOS-Chem Support Team | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01d
Please see the Benchmark approval form for GEOS-Chem v10-01d for complete information about the validation of GEOS-Chem v10-01d.
Feature | Type | Submitted by | Status |
---|---|---|---|
Fix error in ISOPO2 isomerization reaction in globchem.dat | Bug fix | Ploy Achakulwisut (Harvard) | Approved 03 Jun 2014 |
Modify NcdfUtil code to allow re-opening of netCDF "define mode" | Structural | GEOS-Chem Support Team | " " |
Fix parallelization error in nested grid simulations | Bug fix | Jintai Lin (Peking U.) | " " |
Fixed bug in ND44 drydep diagnostic for sea salt aerosols | Bug fix | Kateryna Lapina (CU Boulder) | " " |
Implement final recommendation for J(HAC) and J(PAN) in FAST-JX v7.0 | Science | Sebastian Eastham (MIT), Jingqiu Mao (Princeton) | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01e
Please see the Benchmark approval form for GEOS-Chem v10-01e for complete information about the validation of GEOS-Chem v10-01e.
Feature | Type | Submitted by | Status |
---|---|---|---|
HEMCO emissions component | Structural | Christoph Keller (Harvard) GEOS-Chem Support Team GMAO |
1-month benchmark: Approved 07 Nov 2014 1-year benchmark: Approved 01 Dec 2014 |
Removing references to modules made obsolete by GIGC and HEMCO | Structural | GEOS-Chem Support Team | " " |
Reactivating dust tracers in TOMAS simulations | Bug fix | Jeff Pierce (CSU) David Ridley (MIT) |
" " |
Fix for ND61 diagnostic in TOMAS simulations | Bug fix | Betty Croft (Dalhousie) | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01f
Please see the Benchmark approval form for GEOS-Chem v10-01f for complete information about the validation of GEOS-Chem v10-01f.
Feature | Type | Submitted by | Status |
---|---|---|---|
Two-way coupling between global and nested GEOS-Chem models | Science | Jintai Lin (Peking U.) Yingying Yan (Peking U.) |
Approved 13 Jan 2015 |
Update ALD2 photolysis in FAST-JX v7.0 | Science | Jingqiu Mao (Princeton), Sebastian Eastham (MIT) | " " |
Read 2D data for individual NOx species in ucx_mod.F | Bug fix | Sebastian Eastham (MIT) | " " |
Bug fixes and updates for tagged CO simulation | Bug fix | Jenny Fisher (U. Wollongong) | " " |
Bug fixes for scavenging by co-condensation | Bug fix | Duncan Fairlie (NASA LaRC) | " " |
Correct bugs in stratospheric Bry data | Bug fix | Johan Schmidt (Harvard) | " " |
Introduction of flexible precision into GEOS-Chem | Structural | GEOS-Chem Support Team | " " |
Updates for 0.25° x 0.3125° China nested grid with GEOS-FP meteorology | Structural | Yuxuan Wang (Tsinghua/Galveston) | " " |
Additional minor updates to HEMCO | Structural | Christoph Keller (Harvard) | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01g
Feature | Type | Submitted by | Status |
---|---|---|---|
Add fix to prevent a segmentation fault in HEMCO when emissions are turned off | Bug fix | Christoph Keller (Harvard) |
|
Bug fix in planeflight diagnostic when using short chemistry timesteps | Bug fix | Luke Schiferl (MIT) | " " |
Fix calculation of WETLOSS for non-aerosol tracers in DO_MERRA_CONVECTION and DO_WASHOUT_ONLY | Bug fix | Carey Friedman (MIT) | " " |
Make the netCDF library linking process more portable | Structural | Bob Yantosca (Harvard) | " " |
--Bob Y. 11:08, 26 February 2015 (EST)
v10-01h
Please see the Benchmark approval form for GEOS-Chem v10-01h for complete information about the validation of GEOS-Chem v10-01h.
--Bob Y. 12:31, 27 March 2015 (EDT)
v10-01i
Please see the Benchmark approval form for GEOS-Chem v10-01i for complete information about the validation of GEOS-Chem v10-01i.
Feature | Type | Submitted by | Status |
---|---|---|---|
Online Radiative Transfer in GEOS-Chem | Science | David Ridley (MIT), Colette Heald (MIT) |
In progress |
Reprocessed EMEP emissions for 1990-2012 | Science | Aaron van Donkelaar (Dalhousie) | " " |
Bug fixes for the PARANOX HEMCO extension | Bug fix | Christoph Keller (Harvard) | " " |
Reprocessed AEIC emissions | Bug fix | Christoph Keller (Harvard) | " " |
CO2 simulation emission updates, includes:
|
Science | Ray Nassar (Environment Canada) | " " |
Now call the planeflight diagnostic after chemistry | Bug fix | Karen Yu (Harvard) | " " |
Updates for the 0.25° x 0.3125° nested-grid simulations | Structural | Lin Zhang (PKU) | " " |
Remove obsolete drydep species ISN2 | Structural | Katherine Travis (Harvard) | " " |
Add new features to HEMCO for v10-01i | Structural | Christoph Keller (Harvard) | " " |
--Melissa Sulprizio 17:10, 20 April 2015 (EDT)
Last-minute fixes
The following updates were added as last-minute fixes before the public-release of GEOS-Chem v10-01. These submissions fix errors that were brought to our attention after the v10-01i benchmarks were submitted.
Feature | Type | Submitted by | Status |
---|---|---|---|
Avoid errors when MEGAN biogenic emissions are used with monoterpenes turned off (i.e. MEGAN_mono = false) | Bug fix | Christoph Keller | In progress |
Now use the correct version of FAST-JX input file org.dat | Bug fix | David Ridley | In progress |
Temporarily restore David Streets' emissions instead of using MIX Asian regional emissions inventory | Bug fix | GEOS-Chem Support Team | In progress |
--Bob Y. 17:28, 28 April 2015 (EDT)
New data directories
The following new data directories have been added for GEOS-Chem v10-01. You will have to download the directories relevant to your simulation.
All data directories are now subdirectories of ExtData
The data directory tree used by GEOS-Chem v10-01 has been modified such that all data directories are now subdirectories of a single root folder named ExtData. For more information, please see our Setting up the ExtData directory wiki page.
--Bob Y. 17:54, 28 April 2015 (EDT)
Files for the UCX chemistry mechanism
The UCX chemistry mechanism requires data located in this directory:
$ROOTDIR/ExtData/CHEM_INPUTS/UCX_201403 # Input files for the UCX mechanism
where $ROOTDIR is the top-level data directory on your system. (If you don't know where that is, ask your sysadmin.)
You can download these directories with anonymous FTP or the Wget utility. For instructions, please see Chapter 2.4, Downloading the GEOS-Chem shared data directories in the GEOS-Chem Online User's Guide.
--Bob Y. 17:34, 28 April 2015 (EDT)
Emissions files for use with HEMCO
In GEOS-Chem v10-01 and newer versions, emissions are computed by the HEMCO emissions component and are passed to GEOS-Chem. We have created new data files (in COARDS-compliant netCDF format) for use with HEMCO. These new data files are contained in the HEMCO data directory tree. For detailed instructions on how to download these data files to your disk server, please see our Downloading the HEMCO data directories wiki post.
We recommend placing the HEMCO data in the directory path
$ROOTDIR/ExtData/HEMCO
where $ROOTDIR is the top-level data directory on your system. (If you don't know where that is, ask your sysadmin.)
--Bob Y. 17:34, 28 April 2015 (EDT)
Previous issues now resolved in GEOS-Chem v10-01
The following bugs and/or technical issues have now been resolved in GEOS-Chem v10-01.
Now use correct value of molecular weight for the PROPNN tracer in input.geos
This update was validated in the 1-month benchmark simulation v10-01b and approved on 06 Mar 2014.
This unresolved issue from GEOS-Chem v9-02 has now been corrected.
--Bob Y. 15:45, 12 March 2014 (EDT)
Now use MAP_A2A to regrid 1x1 TOMS O3 to model resolution
This update was validated in the 1-month benchmark simulation v10-01b and approved on 06 Mar 2014.
For complete information about this issue, please see this post on our FAST-J photolysis mechanism wiki page.
--Bob Y. 15:47, 12 March 2014 (EDT)
Bug fix for determining when to use TOMS O3 columns
This update was validated in the 1-month benchmark simulation v10-01c and approved on 29 May 2014.
For complete information about this issue, please see this post on our FAST-J photolysis mechanism wiki page.
--Bob Y. 16:58, 30 May 2014 (EDT)
Fixes for the stratospheric chemistry module
These updates were validated in the 1-month benchmark simulation v10-01c and approved on 29 May 2014.
We have introduced the following fixes to the stratospheric chemistry module. Please see the following posts for more information:
- Reduce memory footprint of the stratospheric chemistry module
- Bug fix in routine GET_RATES_INTERP. affecting nested-grid simulations
--Bob Y. 16:58, 30 May 2014 (EDT)
Various updates for GEOS-Chem specialty simulations
These updates were validated in the 1-month benchmark simulation v10-01c and approved on 29 May 2014.
We have added several updates (both structural updates and minor bug fixes) to the GEOS-Chem specialty simulations. Please view the following posts for more information:
NOTE: Initializing the various specialty simulations from routine GIGC_Init_Extra is necessaary for compatibility with our Grid-Independent GEOS-Chem (aka GIGC) development. We need to initialize all GEOS-Chem simulations at the start of the simulation, and not on the first chemistry or emissiosn timestep after the simulation has already started. This is a requirement of the Earth System Model Framework (ESMF) software upon which our GIGC code relies.
--Bob Y. 16:58, 30 May 2014 (EDT)
Updates to speed up GEOS-Chem execution
These updates were validated in the 1-month benchmark simulation v10-01c and approved on 29 May 2014.
We used the GEOS-Chem Unit Tester and the Tuning and Analysis Utilities (TAU) to locate and fix the following inefficiencies in GEOS-Chem:
Location | Problem | Solution |
---|---|---|
Olson land map module | Performance bottleneck | Speed up computations in subroutine COMPUTE_OLSON_LANDMAP |
GEOS-4 convection module | Array temporary | Removed array temporaries in the call to the GEOS-4 convection routine |
GCAP convection module | Array temporary | Removed array temporaries in the call to the GCAP convection routine |
Ocean mercury module | Array temporary | Removed array temporaries in subroutine READ_HG2_PARTITIONING |
GEOS-5 / GEOS-FP / MERRA advection module | Passing a pointer to an explicit-shape array (inefficiency) | Reduce time spent in advection driver routine TPCORE_FVDAS |
GEOS-FP / MERRA convection module | Inefficient load balancing | Reduce time spent in routine DO_CONVECTION when using GEOS-FP or MERRA |
--Bob Y. 16:59, 30 May 2014 (EDT)
Bug fixes and and updates for v10-01d
These updates were validated in the 1-month benchmark simulation v10-01d and approved on 03 Jun 2014.
GEOS-Chem v10-01d contains fixes for the following minor issues:
Location | Problem | Solution |
---|---|---|
globchem.dat input file | Typo in RIO2 reaction | Remove duplicate GLYX product from RIO2 reaction |
NcdfUtil/m_netcdf_io_define.F90 | Need to re-open netCDF define mode to facilitate HEMCO I/O | Added routine NcBegin_Def to open or re-open the netCDF define mode. Turning on define mode lets you to define a netCDF variable and all its attributes. But before you can write the actual data to the netCDF file, you first have to switch to data mode. Being able to switch between define mode and data mode frees you from the restriction of having to define all netCDF variables and attributes in a single step. |
GeosCore/tpcore_geos5_window_mod.F90 GeosCore/tpcore_geosfp_window_mod.F90 |
Parallelization bug in nested grid simulations | Fix parallelization error in nested grid simulations |
GeosCore/seasalt_mod.F | The ND44 dry dep diagnostic was not being archived properly when the non-local PBL mixing option was turned off (i.e. when using TURBDAY full PBL mixing). | Fixed bug in ND44 drydep diagnostic for sea salt aerosols |
Full-chemistry input files:
|
Implement the final recommendation for J(HAC) and J(PAN). We were not able to include this in the 1-month benchmarks for v10-01c. But these were included in the 1-year benchmarks for v10-01c. | Final recommendation for J(HAC) and J(PAN) |
--Bob Y. 17:20, 3 June 2014 (EDT)
Reactivating dust tracers in TOMAS simulations
These updates were validated with the 1-month benchmark simulation v10-01e and approved on Approved 07 Nov 2014.
The TOMAS team has submitted a fix that allows you to use the online dust tracers in TOMAS simulations. Due to a bug in input_mod.F, this capability had been omitted. For more information, please see this post on our TOMAS aerosol microphysics wiki page.
--Bob Y. 16:15, 13 June 2014 (EDT)
Fix for ND61 diagnostic in TOMAS simulations
These updates were validated with the 1-month benchmark simulation v10-01e and approved on Approved 07 Nov 2014.
Betty Croft submitted a fix for the ND61 diagnostic (TOMAS nucleation rates). For more information, please see this post on our TOMAS aerosol microphysics wiki page.
--Melissa Sulprizio 10:28, 17 September 2014 (EDT)
Bug fixes and and updates for v10-01f
These updates were validated with the 1-month benchmark simulation v10-01f and approved on Approved 13 Jan 2015.
GEOS-Chem v10-01f contains fixes for the following minor issues:
Location | Problem | Solution |
---|---|---|
Input file FJX_spec.dat | Jingqiu Mao (Princeton) and Chris Chan Miller (Harvard) had discovered that the acetaldehyde photolysis rate in FAST-JX v7.0 was incorrect. | This has now been corrected in GEOS-Chem v10-01f. For a complete description of the issue, please see this post on our FAST-JX v7.0 photolysis mechanism wiki page. |
GeosCore/tagged_co_mod.F | Several minor issues were corrected in the Tagged CO simulation. | For more information, please see this post on our Tagged CO simulation wiki page. |
GeosCore/ucx_mod.F | Added 2-D boundary conditions for each of the individual NOx family species. | For more information, please see this post on our UCX chemistry mechanism wiki page. |
GeosCore/wetscav_mod>F | Corrected incorrect values of constants used for the scavenging of H2O2 and NH3 by co-condensation. | For more information, please see this post on our Wet deposition wiki page. |
GeosCore/strat_chem_mod.F90 and HEMCO routines |
Now use updated files for stratospheric Bry concentrations. Data are now placed on the 2° x 2.5° grid and regridded to other resolutions via the HEMCO emissions component. | For more information, please see this post on our Bromine chemistry mechanism wiki page. |
Various | Corrected technical issues in the 0.25° x 0.3125° CH nested grid simulation. | For more information, please see this post on our Nested Model Working Group wiki page. |
Various | Added new functionality into HEMCO. | For more information, please see this post on our Implementation of HEMCO in GEOS-Chem wiki page. |
--Bob Y. 18:10, 13 January 2015 (EST)
Bug fixes and and updates for v10-01g
GEOS-Chem v10-01g contains fixes for the following minor issues:
Location | Problem | Solution |
---|---|---|
GeosCore/hcoi_gc_main_mod.F90 and various other modules |
Turning off emissions in the input.geos file made some HEMCO pointers undefined. When other parts of GEOS-Chem tried to access these pointers, a segmentation fault would occur, which would halt GEOS-Chem execution. | For a complete description of the solution, please see this post on our Implementation of HEMCO in GEOS_Chem wiki page. |
GeosCore/planeflight_mod.F | When running a nested simulation with short timesteps, the TAU values (hours since 01 Jan 1985) that are used to define the beginning and end of a chemistry timestep lack the necessary precision. This can cause desired flight points on the edge of chemistry timesteps to not be written out to the planeflight log file. | Now use the year, month, day, hour, and minute values obtained from time_mod.F to gain extra precision when computing this particular TAU value. |
GeosCore/convection_mod.F GeosCore/wetscav_mod.F |
There is a bug in the calculation of WETLOSS in DO_MERRA_CONVECTION and DO_WASHOUT_ONLY that causes mass of scavenged tracer passed to depo_mercury_mod.F to differ from the mass that is archived in the wet deposition diagnostics (ND38 and ND39). | For a complete description of the solution, please see this post on our Wet deposition wiki page. |
Makefile_header.mk | Some users who have built the netCDF and/or HDF5 libraries with the GEOS-Chem-Libraries installer have reported that GEOS-Chem compiliation dies because the netCDF and/or HDF5 libraries could not be found. This almost always happens if the libraries were built in one directory but later moved to a different directory. | For a complete description of this solution, please this post on our Installing libraries for GEOS-Chem wiki page. |
--Bob Y. 16:40, 13 January 2015 (EST)
Bug fixes and updates for v10-01h
GEOS-Chem v10-01h contains fixes for the following minor issues:
Location | Problem | Solution |
---|---|---|
GeosUtil/grid_mod.F90 | An apparent optimization error was overwriting the YSIN array to -1's and 0's, which should not have happened. The HEMCO emissions component relied on the YSIN array to regrid emission fields. As a result of this error, simulations were dying with a segmentation fault. | For a complete description of the solution, please see this post on our Regridding in GEOS-Chem wiki page. |
--Bob Y. 17:12, 1 April 2015 (EDT)
Bug fixes and updates for v10-01i
GEOS-Chem v10-01i contains fixes for the following minor issues:
Location | Problem | Solution |
---|---|---|
GeosCore/drydep_mod.F GeosCore/tracerid_mod.F |
The dry deposition module still referred to obsolete drydep species ISN2. This has now been replaced by ISN1. | For a complete description of the solution, please see this post on our Dry deposition wiki page. |
GeosCore/main.F | Karen Yu noted that the plane flight diagnostic was being written out right after emissions, rather than after chemistry, which was biasing the results, particularly for things like NOx and isoprene. | The PLANEFLIGHT routine (in GeosCore/planeflight_mod.F is now called after chemistry. |
GeosUtil/regrid_a2a_mod.F90 | Regional emissions data files (e.g. EMEP, MIX, NEI2011) as read in by HEMCO were being regridded incorrectly. Negatives were appearing in the arrays for these emissions within the HEMCO data structure. | For a complete description of the solution, please see this post on our Regridding in GEOS-Chem wiki page. |
Headers/gigc_input_mod.F90 GeosCore/chemistry_mod.F GeosCore/convection_mod.F GeosCore/diag_mod.F GeosCore/pjc_pfix_geosfp_window_mod.F GeosCore/tpcore_geosfp_window_mod.F90 GeosCore/transport_mod.F GeosCore/wetscav_mod.F GeosUtil/bpch2_mod.F GeosUtil/grid_mod.F90 HEMCO/Extensions/hcox_lightnox_mod.F90 |
The following issues were observed in the 0.25° x 0.3125° nested-grid simulations:
|
Lin Zhang (PKU) submitted these fixes for the 0.25° x 0.3125° nested-grid simulations.
|
--Bob Y. 11:24, 16 April 2015 (EDT)
Last-minute fixes prior to the GEOS-Chem v10-01 public release
Location | Problem | Solution |
---|---|---|
Input file HEMCO_Config.rc HEMCO/Extensions/hcox_megan_mod.F |
Turning off monoterpenes in MEGAN (i.e. setting MEGAN_mono to "false" in the configuration file) resulted in array out-of-bounds errors. | For a complete description of the solution, please see this post on our Implementation of HEMCO in GEOS-Chem wiki page. |
Input file org.dat | An version of FAST-JX input file org.dat lacking multi-wavelength data was being used. | For a complete description of the solution, please see this post on our FAST-JX 7.0 photolysis mechanism wiki page. |
MIX emissions inventory | We are trying to determine if an unexpected decrease in SO2 emissions indicates a problem with the MIX data files as they were given to us. | For the time being, we recommend GEOS-Chem users to select the David Streets regional emissions for China and SE Asia until the problem is resolved. The fix for this issue may involve reprocessing the MIX data files from scratch. |
--Bob Y. 17:20, 28 April 2015 (EDT)
Outstanding issues not yet resolved in GEOS-Chem v10-01
The following issues have not yet been resolved in GEOS-Chem v10-01. Some of these issues represent questions of open research rather than bugs in the source code.
Incorrect photolysis rates in FAST-JX v7.0
Jingqiu Mao (Princeton) and Chris Chan Miller (Harvard) discovered that some FAST-JX v7.0 photolysis rates are incorrect:
This is currently an open area of research in GEOS-Chem.
--Bob Y. 14:09, 13 January 2015 (EST)