GEOS–Chem Online User's Guide

GEOS–Chem v10-01 Online User's Guide

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Appendix 10: GEOS-Chem Version History

On this page we shall preserve the list of "What's new" in each GEOS-Chem public release.

Please also see our archive of past GEOS-Chem User's Guides page.

A10.1 What's new in GEOS-Chem v10-01

The following features were introduced into GEOS-Chem public release v10-01:

Feature	Developer(s)
Science updates
Updates to dry deposition when using the Olson 2001 land map	Patrick Kim (Harvard)
UCX stratospheric chemistry mechanism	Sebastian Eastham (MIT)
Fast-JX photolysis mechanism	Sebastian Eastham (MIT), Jingqiu Mao (Princeton)
Final recommendation for J(HAC) and J(PAN) in FAST-JX v7.0	Sebastian Eastham (MIT), Jingqiu Mao (Princeton)
Two-way coupling between global and nested GEOS-Chem models	Jintai Lin (Peking U.), Yingying Yan (Peking U.)
Update ALD2 photolysis in FAST-JX v7.0	Jingqiu Mao (Princeton), Sebastian Eastham (MIT)
HEMCO emissions component	Christoph Keller (Harvard)
FINN biomass burning emissions (optional inventory implemented via HEMCO)	Jenny Fisher (U. Wollongong), Jingqiu Mao (Princeton), Christine Wiedinmyer (NCAR)
GFED4 biomass burning emissions (implemented via HEMCO)	Prasad Kasibhatla (Duke), Christoph Keller (Harvard)
Guenther et al (2012) updates to MEGAN2.1 biogenic emissions (implemented via HEMCO)	Dylan Millet (U. Minnesota)
Updates to ship NOx chemistry (implemented via HEMCO)	Chris Holmes (UC Irvine), Geert Vinken (Eindhoven)
MASAGE NH3 agricultural emissions (optional inventory implemented via HEMCO)	Fabien Paulot (NOAA, formerly Harvard)
EDGAR v4.2 global anthropogenic emissions (implemented via HEMCO)	Qiang Zhang (Tsinghua), Meng Li (Tsinghua), Sajeev Philip (Dalhousie)
HTAP global anthropogenic emissions (optional inventory implemented via HEMCO)	Qiang Zhang (Tsinghua)
MIX Asian anthropogenic emissions (implemented via HEMCO)	Qiang Zhang (Tsinghua), Meng Li (Tsinghua)
NEI 2011 emissions with hourly resolution (implemented via HEMCO)	Katie Travis (Harvard)
Reprocessed EMEP emissions for 1990-2012 (implemented via HEMCO)	Aaron van Donkelaar (Dalhousie)
Updated OTD/LIS factors for GEOS-FP through October 2014 (implemented via HEMCO)	Lee Murray (Columbia)
Online Radiative Transfer in GEOS-Chem	David Ridley (MIT), Colette Heald (MIT)
Structural updates
MAP_A2A used to regrid 1x1 TOMS O3 to model resolution	Jintai Lin (Peking U.)
Support for TAU performance profiler	John Linford (ParaTools, Inc.), GEOS-Chem Support Team
Fixes for the stratospheric chemistry module	GEOS-Chem Support Team
Updates to speed up GEOS-Chem execution	GEOS-Chem Support Team
NcdfUtil code now allows re-opening of netCDF "define mode"	GEOS-Chem Support Team
Removal of references to modules made obsolete by GIGC and HEMCO	GEOS-Chem Support Team
Introduction of flexible precision into GEOS-Chem	GEOS-Chem Support Team
Updates for 0.25° x 0.3125° China nested grid with GEOS-FP meteorology	Yuxuan Wang (Tsinghua/Galveston)
Make the netCDF library linking process more portable	GEOS-Chem Support Team
Bug fixes
Use correct molecular weight for the PROPNN tracer in input.geos	Jenny Fisher (U. Wollongong)
Bug fix for determining when to use TOMS O3 columns	GEOS-Chem Support Team
Fixes for timeseries diagnostics to allow for more transported tracers	GEOS-Chem Support Team
Various updates for GEOS-Chem specialty simulations	Jeff Pierce (CSU), Kevin Wecht (Harvard), Matthew Johnson (NASA), GEOS-Chem Support Team
Fix error in ISOPO2 isomerization reaction in globchem.dat	Ploy Achakulwisut (Harvard)
Fix parallelization error in nested grid simulations	Jintai Lin (Peking U.)
Fix bug in ND44 drydep diagnostic for sea salt aerosols	Kateryna Lapina (CU Boulder)
Reactivate dust tracers in TOMAS simulations	Jeff Pierce (CSU), David Ridley (MIT)
Fix for ND61 diagnostic in TOMAS simulations	Betty Croft (Dalhousie)
Read 2D data for individual NOx species in ucx_mod.F	Sebastian Eastham (MIT)
Bug fixes and updates for tagged CO simulation	Jenny Fisher (U. Wollongong)
Bug fixes for scavenging by co-condensation	Duncan Fairlie (NASA LaRC)
Correct bugs in stratospheric Bry data	Johan Schmidt (Harvard)
Bug fix in planeflight diagnostic when using short chemistry timesteps	Luke Schiferl (MIT)
Fix calculation of WETLOSS for non-aerosol tracers in DO_MERRA_CONVECTION and DO_WASHOUT_ONLY	Carey Friedman (MIT)
Fix for optimization error discovered in v10-01h	GEOS-Chem Support Team

A10.2 What's new in GEOS-Chem v9-02

The following features were introduced into GEOS-Chem public release v9-02:

Feature	Developer(s)
Science updates
New soil NOx emission module	Rynda Hudman Kay (EPA), Neil Moore (formerly of Dalhousie), Bram Maasakkers (Eindhoven)
EPA/NEI05 North American Hg emissions	Yanxu Zhang (U. Washington), Lyatt Jaeglé (U. Washington)
Nested-grid Hg simulation	Yanxu Zhang (U. Washington), Lyatt Jaeglé (U. Washington)
Streets future Hg emissions	Bess Corbitt (Harvard)
Correct Hg simulation to use updated Hg(0) oxidation kinetics	Bess Corbitt (Harvard), Justin Parrella (Harvard)
Capability to use GEOS-Chem Br/BrO fields in Hg simulation	Bess Corbitt (Harvard), Justin Parrella (Harvard)
POPs simulation: Polycyclic aromatic hydrocarbons	Carey Friedman (MIT), Noelle Selin (MIT)
Inorganic chemistry updates	Mat Evans (York)
Methyl peroxy nitrate (MPN) chemistry	Ellie Browne (UC Berkeley)
Adopt Paulot isoprene scheme as standard	Fabien Paulot (Harvard), Eloise Marais (Harvard), Jingqiu Mao (NOAA/GFDL), Mat Evans (York)
Fix RO2+HO2 rate constant	Fabien Paulot (Harvard)
Increase NO3 uptake by aerosol	Jingqiu Mao (NOAA/GFDL)
Removal of NOx-Ox partitioning	GEOS-Chem Support Team
Inhibition of N2O5 uptake by nitrate aerosol	Lin Zhang (Peking University)
Improved HO2 uptake by aerosol	Jingqiu Mao (NOAA/GFDL)
Updated NH3 seasonal scaling factors over the US	Lin Zhang (Peking University)
Updated Canadian NH3 inventory	Wai-Ho Lo (Dalhousie)
RCP emission scenarios	Chris Holmes (UC Irvine)
EDGAR v4.2 emissions for CH4 simulation	Kevin Wecht (Harvard)
Update anthropogenic scale factors through 2010	Aaron van Donkelaar (Dalhousie)
Update GFED3 emissions to 2011	Prasad Kasibhatla (Duke)
Update TOMS overhead O3 columns to 2010	Jenny Fisher (U. Wollongong)
Include 12-bin and 15-bin configurations of TOMAS	Sal Farina (CSU)
AEIC aircraft emissions inventory	Sebastian Eastham (MIT), Steven Barrett (MIT)
SOA simulation with semi-volatile POA	Havala Pye (EPA), GEOS-Chem Support Team
Implement non-local PBL mixing in the Rn-Pb-Be simulation	Jintai Lin (Peking University), GEOS-Chem Support Team
Cloud water pH for sulfate formation	Becky Alexander (U. Washington)
Update jv_spec.dat and jv_spec_aod.dat with better representation of OC growth with RH and correction to sulfate optics	David Ridley (MIT), Randall Martin (Dalhousie)
Structural updates
Grid-independent GEOS-Chem updates: Activation of new data pathways and other structural modifications	GEOS-Chem Support Team
Inline the latest source code modifications updates for the TOMAS microphysics package into GEOS-Chem	Sal Farina (CSU), GEOS-Chem Support Team
Additional modifications to enable GEOS-Chem to run within the GEOS-5 GCM	GEOS-Chem Support Team
Streamlining of the code in GeosCore/mercury_mod.F	Chris Holmes (UC Irvine)
Rewriting inefficient subroutine calls to avoid wasting memory and CPU cycles	GEOS-Chem Support Team
Modifications for GEOS-Chem Unit Tester	GEOS-Chem Support Team
Nested-grid model at 0.25° x 0.3125° resolution using GEOS-FP met data product from GMAO	Yuxuan Wang (Tsinghua), GEOS-Chem Support Team
Global simulations with GEOS-FP data product from GMAO	GEOS-Chem Support Team
Bug fixes
Correction for GEOS-5 PBL heights	Sajeev Philip (Dalhousie)
Bug fix in hdf_mod.F	Sajeev Philip (Dalhousie)
Bug fixes for tagged CO simulation	Jenny Fisher (U. Wollongong), GEOS-Chem Support Team
Bug fix for nested simulation in nei_anthro_mod.F	Sajeev Philip (Dalhousie)
Bug fix for updated CAC emissions	Aaron van Donkelaar (Dalhousie)
Bug fix for Br2 emissions	GEOS-Chem Support Team
Bug fix in regridding of anthropogenic emissions (NEI2005, Streets)	GEOS-Chem Support Team
Additional bug fixes for MAP_A2A regridding	GEOS-Chem Support Team
Bug fix for MEGAN emissions when using MERRA or GEOS-FP	Tzung-May Fu (Peking University)
Bug fixes for nested Hg simulation	Yanxu Zhang (U. Washington)
Prevent bad drydep flux values from being passed to the soil NOx emissions module	Patrick Kim (Harvard), GEOS-Chem Support Team
Bug fix for declaration of GEOS-FP PFICU, PFLCU, PFILSAN, PFLLSAN fields	GEOS-Chem Support Team
Bug in EMIS_STREETS_ANTHRO_05x0666	Jenny Fisher (U. Wollongong)
Bug fix for reading OH file in offline simulations	GEOS-Chem Support Team
Bug in wet deposition Henry's constant	Fabien Paulot (Harvard)
Add DRYACET to globchem.dat	Emily Fischer (Harvard)
Fix diurnal NOx scale factors and fix double counting of biofuels over Mexico, Canada, and Europe	Christoph Keller (Harvard)
Bug fix for 3-hourly GFED3 emissions	Christoph Keller (Harvard)
Bug fix in grid_mod.F90	Christoph Keller (Harvard)
Bug fix for anthropogenic scaling factors for years 2006 and later	Jenny Fischer (U. Wollongong)
Correct additional bugs in ship emissions w/ non-local PBL mixing	Chris Holmes (UC Irvine), Geert Vinken (Eindhoven)
Bug fix for ship CO emissions	Chris Holmes (UC Irvine)
Fix typo in VOLCPRESS definition	Thibaud Thonat (U. Edinburgh)
Bug fixes in day-of-week computation	GEOS-Chem Support Team
Bug fixes in diag48_mod.F	Jenny Fisher (U. Wollongong)
Bug fix in emissions for offline aerosol simulation	GEOS-Chem Support Team
Corrected minor bugs for GCAP that were introduced by GIGC edits	GEOS-Chem Support Team
Minor bug fix in TOMAS sulfate emissions	Sal Farina (CSU)
Bug fix in ND36 diagnostic when ship emissions are turned off	Yanko Davila (U. Colorado)
Fix molecular weights of RIP and IEPOX used in drydep_mod.F	GEOS-Chem Support Team
Bug fixes to prevent floating-point invalid errors	GEOS-Chem Support Team
Bug fix in jv_spec_aod.dat for dust species	Gabriele Curci (U. L'Aquila)
Fix bug in CAC NH3 emission files	Wai Ho Lo (Dalhousie)

A10.3 What's new in GEOS-Chem v9-01-03

The following features were introduced into GEOS-Chem public release v9-01-03:

Feature	Description
Science updates
Updated acetone chemistry	Emily Fischer has updated the acetone formulation used in GEOS-Chem. See the acetone wiki page for more information.
OVOC dry deposition updates	The reactivity factor (f0) for all OVOCs has been changed from 0 to 1, according to Karl et al. (2010). See this wiki page for more information.
Improved sea salt emission and deposition	Sea salt emissions and dry deposition have been updated according to Jaeglé et al. (2011).
Dust submicron size distribution	A more realistic partitioning for the dust mass into the submicron size bins has been applied. See this wiki page for more information.
Improved snow scavenging and washout parameterization	The following updates have been added to improve wet scavenging algorithm: Add scavenging by snow Update aerosol scavenging efficiency
PARANOX ship plume emissions	Previously, 10 molecules O3 and 1 molecule HNO3 were emitted per ship NOx molecule. Ship emissions have been updated according to Vinken et al. (2011) to account for non-linear chemistry of ship plumes. See this wiki page for more information.
Add scaling of lightning NOx for 2x2.5 MERRA simulations	Lee Murray has generated OTD/LIS local redistribution factors for use with MERRA at 2° x 2.5°. See this wiki page for more information.
Historical emission inventories of SO2, NOx, BC, and POA	Historical emission inventories of SO2, NOx, BC, and POA have been implemented according to Leibensperger et al. (2011). See this wiki page for more information.
Nested-grid updates for offline simulations	Nested-grid capability has been added to the following offline simulations: Nested-grid CO2 Nested grid CH4 (North America)
Hg(II) gas-aerosol partitioning	This update includes the following items: Hg(II) gas-aerosol partitioning from Amos et al. (2012) Primary anthropogenic Hg(p) is emitted as Hg(II)
CH4 simulation updates	Kevin Wecht has updated the CH4 simulation to include GFED3 biomass burning emissions and linearized CH4 chemistry from GMI output. See the CH4 simulation wiki page for more information.
Daily and 3-hourly GFED3 biomass emissions	Prasad Kasibhatla updated GEOS-Chem to incorporate the capabilty to use GFED3 daily and 3-hourly fire fractions, and to regrid on the fly from the GFED3 native resolution (0.5° x 0.5°) to the model resolution. See this wiki page for more information.
Tropospheric bromine chemistry	Justin Parrella added 10 bromine tracers and their associated chemical reactions to the GEOS-Chem full chemistry simulation. See this wiki page for more information
Satellite-based NOx emission trends	Scaling factors for anthropogenic NOx emissions derived from OMI tropospheric NO2 columns (compiled by Lok Lamsal) have been implemented. See this wiki page for more information.
Stratospheric P and k (monthly climatology)	An updated linearized stratospheric chemistry scheme has been implemented into GEOS-Chem v9-01-03. See the stratospheric chemistry wiki page for more information.
Structural updates
Retirement of obsolete GEIA biogenic emissions	GEIA biogenic VOC emissions have been removed from GEOS-Chem v9-01-03. It is recommended that you use the MEGAN biogenic emissions in your GEOS-Chem simulations.
Structural changes to clarify science behind washout	Washout code has been split into three cases: aerosols, HNO3, and soluble gases. This was done to ensure that HNO3 is not affected by the aerosol scavenging updates and is still scavenged according to Eq. 14 from Jacob (2000).
Initial source code modification for GEOS-5.7.2	GEOS-Chem has been modified for compatilibility with the GEOS-5.7.2 meteorological data.
Remove support for GEOS-3 meteorology	See this wiki page for more information.
Updates from the grid-independent GEOS-Chem model code	Modifications made for the grid-independent GEOS-Chem model include: Fixes to facilitate implementation of grid-independent code Preliminary interface to link driving GCM
MAP_A2A regridding package	Matt Cooper replaced the existing GEOS-Chem regridding routines with the MAP_A2A regridding package (developed by S.-J. Lin and refined by Bob Yantosca). The new algorithm regrids emissions from any arbitrary horizontal grid to the current model resolution.
Bug fixes
Fix for GLCO3/GLPAN bug in standard chemistry mechanism	Fabien Paulot found a bug in the standard chemistry mechanism, which resulted in an artificial loss of NOx. See this wiki page for more information.
Bug fix in routine ARSL1K	The default value for the loss rate on wet aerosol (ARSL1K) has been changed from 1.0d-3 to 1.0d-30. See this wiki page for more information.
Various other bug fixes	The following updates were made to fix several bugs in GEOS-Chem v9-01-02: Bug fixes for David Streets emissions for years 2005 and earlier Bug fix in emep_mod.F for offline simulations Bug fix in nei2005_anthro_mod.F for offline simulations Bug fix to prevent crash in wetdep when encountering anomalously low PRECTOT values Minor fix in Rn-Pb-Be simulation to prevent missing drydep diagnostics Correct out-of-bounds error in offline aerosol simulation Bug fixes in diag3.F Bug fixes for nested-grid simulations Bug fix for reading Hg emissions Bug fix in streets anthro mod.F for offline simulations Bug fixes for dicarbonyl simulations

A10.4 What's new in GEOS-Chem v9-01-02

The following features were introduced into GEOS-Chem public release v9-01-02:

Feature	Description
Science updates
Updated dry deposition velocities for aerosols over ice and snow	Modeled aerosol dry deposition velocities over snow and ice surfaces in the Arctic were much higher than estimated from measured values (e.g., Ibrahim et al. [1983]; Duan et al. [1988]; Nilsson and Rannik [2001]). In v9-01-02, a dry deposition velocity of 0.03 cm/s is imposed for all aerosols over snow and ice surfaces.
Imposed seasonality on the NH3 emissions from David Streets 2000 inventory	The Streets 2000 inventory for anthropogenic ammonia (NH3) does not include any seasonal cycle. This has been corrected by using the annual total from Streets 2000 superimposed with monthly scale factors from a global inventory compiled by Marcel Meinders and Lex Bouwman.
RETRO anthropogenic VOC emissions	Monthly RETRO anthropogenic VOC emissions have been added as an optional inventory. For more information, please see this document: W. Reinhart and D. Millet, Implementation of the RETRO Anthropogenic Emission Inventory into the GEOS-Chem model, May 2011.
APM aerosol microphysics	Fangqun Yu and Gan Luo developed the Advanced Particle Microphysics (APM) package for implementation into GEOS-Chem. APM is now one of two microphysics packages in GEOS-Chem, the other being TOMAS.
GFED3 biomass burning emissions	Monthly mean GFED3 biomass burning emissions have been added to v9-01-02. The GFED3 emissions inventory will eventually replace GFED2.
GEIA 2005 Hg emissions	Bess Corbit prepared the GEIA 2005 emission inventory for anthropogenic Hg.
Structural updates
Modifications for compatability with ESMF	Modifications were made to GEOS-Chem source code to enable compatability with the Earth System Model Framework (ESMF). These changes were were aimed at cleaning up legacy code and making specific portions of the code FORTRAN 90/95 compliant. For more information, please see the following links: Source code cleanup and initial ESMF prep Elimination of COMMON blocks
MERRA SEAICExx fields added to the planeflight diagnostic	The MERRA SEAICExx fields are now saved to the plane flight diagnostic.
Overhaul of AOD diagnostics	Patrick Kim discovered some inconsistencies in the way aerosol optical depth diagnostics were being computed in v9-01-01 and prior versions. See this wiki page for more information.
Archive MERRA SWGDN field in the ND67 diagnostic	MERRA "incident shortwave radiation at the ground" (SWGDN) is now archived to ND67, not "net longwave radiation at the ground" (LWGNT).
Centralized chemistry time step	The time at which chemistry, emissions, photolysis, and drydep operations are performed has been moved to the midpoint of the chemistry time step. See this wiki page for more information.
Bug fixes
Bug fixes for the offline Hg simulation	The following issues were discovered in the offline Hg simulation shortly after the release of v9-01-01 and have been fixed in v9-01-02: De-hardwire file path BR_DIR in `global_br_mod.F` Negative concentrations of aquatic mercury VEGEMIS bug fix for GCAP simulation Division by zero error Bug fixes for ND03 mercury diagnostics
Various other bug fixes	The following updates were made to fix several bugs: Corrected mis-indexing error in `partition.F` caused by the dynamic tropopause Corrected out-of-bounds error in `readchem.F` Fix for mis-indexing issue in CSPEC restart file Bug fixes for leap years when using GCAP met fields Minor bug fixes for emissions routines affecting offline simulations Fixes for minor issues affecting nested-grid simulations Bug fixes for compatibility with the PGI compiler Washout fix for non-aerosol species Fix for GEIA emissions scaling factor over Botswana Fixed minor issues in MERRA cloud convection routine Fix for vertical regridding of offline OH for offline simulations Further fixes for nested-grid simulations Fix for partitioning chemical species Bug fix for Streets biofuel emissions Bug fix in EDGAR ship emissions code Bug fix in ship NOx emissions

A10.5 What's new in GEOS-Chem v9-01-01

The following features were introduced into GEOS-Chem public release v9-01-01:

Feature	Description
Capability to run with GMAO MERRA meteorological fields	GEOS-Chem v9-01-01 is the first version to be compatible with the MERRA met data product from GMAO. MERRA is a 30-year reanalysis data set which spans the years 1979-2010.
Bug fix for lightning NOx emissions	In GEOS-Chem v9-01-01, the following updates were made that impact the emissions of lightning NOx: Bug fix for incorrect cloud-top-height determination Addition of updated vertical release profiles (cf. Ott et al 2010) Removal of obsolete options from the source code (`lightning_nox_mod.f`) For detailed information about these updates, please see this document: L.T. Murray, Changes affecting lightning NOx emissions in GEOS-Chem v9-01-01, January 2011
Improvements to the wet deposition and convective updraft scavenging algorithms	Helen Amos and Bess Corbitt have updated the wet deposition and convective updraft scavenging algorithms, particularly for the new MERRA met fields. Also, following upon the work of Qiaoqiao Wang, we now allow both rainout and washout to happen simultaneously in a grid box where new precipitation is forming.
Updated volcanic SO2 emissions from Aerocom	The latest volcanic SO2 emissions update from Thomas Diehl have been applied to GEOS-Chem v9-01-01.
Important bug fixes for ship emissions	Geert Vinken has submitted a couple of important fixes for ship emissions. These have been added to v9-01-01. For more information, please see the following links: Bug fix for ship emissions in emfossil.f Updated mask for EMEP ship emissions
EPA/NEI05 biofuel bug fix	A bug in the EPA/NEI05 emissions code was found prior to the release of GEOS-Chem v9-01-01. Long story short: when the EPA/NEI05 option is selected, the wrong biofuel emissions inventory is used over the continental USA. For a complete description of this bug, please see this post on our EPA/NEI05 wiki page.
Various technical improvements	The following updates were made to fix several technical issues: All bug fix patches from v8-03-02 have now been standardized in v9-01-01 Simulations may be started at times other than 0h GMT Modifications were made to the non-local PBL mixing scheme to improve efficiency The main loop in the LINOZ stratospheric chemistry scheme was parallelized Duplicate printout of certain diagnostics was corrected A fix was added to prevent div-by-zero in sulfate_mod.f Erroneous ND15 diagnostic behavior in the non-local PBL scheme was corrected The PEDGE-$ diagnostic category is archived to timeseries diagnostics Offline simulations can now run on the GEOS-5/MERRA full-vertical grid

A10.6 What's new in GEOS-Chem v8-03-01 and v8-03-02

The following features were introduced into GEOS-Chem public release v8-03-01:

Feature	Description
Caltech isoprene chemistry mechanism	A new isoprene chemistry was introduced as an option to solve an over-estimation in isoprene in previous GEOSChem versions.
LINOZ stratospheric ozone chemistry	Implementation of LINOZ which provides a linear chemistry for ozone in the stratosphere.
ISORROPIA II	ISORROPIA II is now used to calculate the aerosol thermodynamic equilibrium instead of RPMARES.
Updated aerosol optical properties for FAST-J photolysis	The GEOS-Chem Aerosols Working Group has created an updated list of aerosol optical properties (i.e. quantum yields, cross-sections) for input into the FAST-J photolysis mechanism.
Option to use chemical solver from KPP software	The KPP chemical solver now contains 3 mechanisms to choose from: Standard simulation without secondary organic aerosols Standard simulation with secondary organic aerosols Simulation with new isoprene chemistry scheme
Emissions modifications	Various modifications to existing emissions inventories, including: Extension of annual anthropogenic scale factors to 2006 EMEP emissions extended to 2007 and Seasonality extended to SOx, CO, and NH3 BOND inventory for BC and OC with monthly variations Implementation of MEGAN v2.1 biogenic emissions Implementation of ICOADS ship emissions Volcanic SO2 emissions from AeroCom EPA/NEI 2005 inventory for North America
New non-local planetary boundary layer scheme	Jintai Lin has implemented a new boundary layer mixing scheme option into GEOS-Chem. It is a non-local scheme formulated by Holtslag and Boville (1993).
Modifications to SOA formation	Several modifications were applied to the secondary organic aerosol scheme: SOA no longer depends on inorganic concentrations SOA formation now includes formation by aromatics We now use the speciated emissions from MEGAN v2.1
Updates for sea salt aerosols	Lyatt Jaeglé and Becky Alexander have updated the sea salt emissions scheme in GEOS-Chem.
TOMAS aerosol microphysics option	The Carnegie-Mellon group has interfaced the TOMAS aerosol microphysics scheme into GEOS-Chem.
Global 1° x 1.25° simulation capability	Lok Lamsal from Dalhousie University has added the capability to run GEOS-Chem at the GEOS-4 native resolution of 1° x 1.25°.
Modifications to / Creation of the GEOS-5 0.5° x 0.667° N. American and European Nested Grid simulation	Several modifications were made to GEOS-Chem's nested grid simulation capability, including: Standardization of North America 0.5° x 0.667° nested grid (GEOS-5) Introduction of Europe 0.5° x 0.667° nested grid (GEOS-5) Ability to keep boundary conditions for different grids in different directories HDF5 output has been added to selected timeseries diagnostics.
Updated CH4 simulation	Christopher Pickett-Heaps and Kevin Wecht have updated the CH4 simulation in GEOS-Chem, following earlier work by Jerome Drevet.

The following features were introduced into GEOS-Chem beta release v8-03-02:

Feature	Description
Terrestrial and deep ocean mercury	The Global Terrestrial Mercury Model (cf. Nicole Smith-Downey) can now be selected as an option in the standard mercury simulation. Many features of the mercury simulation have also been improved (cf. E. Sunderland, C. Holmes).
Updated CO2 simulation	Ray Nassar has updated the CO2 simulation with new inventories and fluxes. For a full description, see our CO2 simulation wiki page.
Obtain liquid water content from GEOS-5 met fields	Jenny Fisher modified the existing SO2 chemistry scheme such that it will obtain the cloud fraction and liquid water content directly from the GEOS-5 meteorlogy.

A10.7 What's new in GEOS-Chem v8-02-01

The following features were introduced into GEOS-Chem public release v8-02-01:

Feature	Description
Updated chemical reactions	Chemical relations and relation rates are updated mainly from JPL06 and IUPAC06. Photolysis quantum yields are updated from FAST-JX version 6.4 data. See HERE for detailed changes compared to v8-01-04. The pressure-dependency sheme for acetone photolysis is now updated to FAST-JX version 6.4. The format of jv_spec.dat file has slightly changed. The new format is explained in Chapter 5: GEOS-Chem run directories.
Updated dust scattering
Updated emissions	Several emission inventories are updated or newly implemented. All details concerning emissions are in Chapter 4: GEOS-Chem data directories.
Improved stratospheric exchange	GEOS-Chem uses now the transport routine and pressure fixer from GMI. This ensures to have a reasonable troposphere-stratosphere exchange.

A10.8 What's new in GEOS-Chem v8-01-01

The following features were introduced into GEOS-Chem public release v8-01-01:

Feature	Description
Compatibility with GEOS-5 meteorological fields	GEOS-Chem v8-01-01 is now fully compatible with the GMAO GEOS-5 operational data product (e.g. GEOS-5.0.1 and GEOS-5.1.0). You must upgrade to GEOS-Chem v8-01-01 if you wish to drive GEOS-Chem with the GEOS-5 meteorology. Please see the GEOS-Chem wiki for a more complete account of some of the issues that were encountered during GEOS-5 implementation.
GEOS-1 and GEOS-STRAT meteorology is no longer supported	With the availability of several years of GMAO's GEOS-4 and GEOS-5 meteorological data products, it is no longer necessary to use the older GEOS-1 and GEOS-STRAT products. Therefore, GEOS-Chem v8-01-01 no longer supports these data sets. NOTE: GMAO's GEOS-3 meteorological data product is still supported in GEOS-Chem v8-01-01, and will continue to be supported indefinitely.
Dynamic tropopause	GEOS-Chem now has the capability to perform chemistry with SMVGEAR up to the location of the actual tropopause, as diagnosed by the tropopause pressure (TROPP) meteorological field. This results in a more accurate representation of the tropopause, and causes more grid boxes in the tropics to be sent to the SMVGEAR solver. In prior versions, SMVGEAR chemistry was only done up to the location of the annual mean tropopause.
Updated lightning with OTD/LIS local redistribution	The lightning NOx emissions algorithm in GEOS-Chem v8-01-01 has been substantially rewritten to try to better match the observational distribution of lightning flashes. The location of lightning flashes now follows the patterns observed by the OTD/LIS satellite instruments.
Updated global and regional anthropogenic emissions	In GEOS-Chem v8-01-01, the default GEIA/Piccot anthropogenic emissions can now be overwritten with a combination of global and regional anthropogenic emissions inventories, including: EDGAR (global) EMEP (Europe) BRAVO (Mexico) Updated EPA-NEI99 (USA) David Streets (SE Asia) Click HERE to view a table with more detailed information about each of these inventories. NOTE: In afuture version of GEOS-Chem, we will be introducing an improved algorithm to scale fossil fuel emissions from the baseline year of 2000 to the present year (cf. Aaron van Donkelaar).
GFED2 biomass burning emissions	In GEOS-Chem v8-01-01, you may select either the default Duncan et al (2001) biomass burning emissions, or the GFED2 biomass burning emissions. NOTE: At present only the GFED2 monthly mean emissions have been implemented. The 8-day-averaged GFED2 emissions will be introduced into a future version of GEOS-Chem (cf. Ray Nassar).
Safer floating-point operations	GEOS-Chem v8-01-01 includes some extra floating point error traps (e.g. safe division, avoiding division by zero, etc.) in order to prevent NaN and infinity values from propagating throughout the code. Also, a bug fix was implemented into SMVGEAR in order to better screen out negative values.
Aerosol Thermodynamic Equilibrium with RPMARES	It was recently discovered that the version of ISORROPIA that ships with GEOS-Chem can give bad values when computing the aerosol thermodynamical equilibrium for grid boxes where relative humidity is below 30%. Therefore, until further notice we have reverted back to the RPMARES code for computing aerosol thermodynamical equilibrium until further notice.
Compatibility with SunStudio 11/12 and Intel Fortran Compiler 10	GEOS-Chem v8-01-01 now ships with Makefiles for compiling with the newest Sun or Intel Fortran compilers. Options for using the TotalView Debugger are also now included in the makefiles.

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