HEMCO data directories

On this page we describe the directory tree from which the HEMCO emissions component can read emissions inventories and other atmospheric data sets.

Overview

The HEMCO emissions component can read several types of emission inventories, as well as other types atmospheric data sets, such as production and loss rates, or concentration data. We have collated all of this data into a comprehensive directory tree structure. Each folder of the HEMCO data directory tree represents a particular emissions inventory or other data set.

At present, the HEMCO data directory tree resides on the disk servers at Harvard University (and soon at Dalhousie University). We have created a package that will let you download this directory tree to your local disk storage space. For more information, please see the Downloading the HEMCO data directories section below.

Please see our list of recommended default emission inventories, which has been compiled by the Emissions and Deposition Working Group.

--Bob Yantosca (talk) 22:27, 7 September 2017 (UTC)

Default GEOS-Chem emissions configurations

Christoph Keller and the GEOS-Chem Support Team have prepared documents describing the standard GEOS-Chem emissions configurations for recent GEOS-Chem versions. These emissions configurations are specified in the HEMCO configuration file (aka HEMCO_Config.rc), which is read by GEOS-Chem at startup.

Configuration	Released	Notes
Default emissions configuration for GEOS-Chem 12.3.0 — Current configuration	01 Apr 2019	Also applies to GEOS-Chem 12.3.1
Default emissions configuration for GEOS-Chem 12.2.0	19 Feb 2019	Also applies to GEOS-Chem 12.2.1
Default emissions configuration for GEOS-Chem 12.1.0	26 Nov 2018	Also applies to GEOS-Chem 12.1.1
Default emissions configuration for GEOS-Chem 12.0.0	10 Aug 2018	Also applies to GEOS-Chem 12.0.1, 12.0.2, and 12.0.3

Information about each individual inventory or data source may be found in the following sections.

HEMCO data directory structure

The sections below describe each of the data sets contained in the HEMCO directory tree, grouped by type.

In each of the tables below:

The Inventory column contains a link that describes each data set in more detail. Most of these links point to existing pages on the GEOS-Chem wiki.

The Data file info column points to the README files that are stored with each data set. Each README provides a list of the files contained within a given folder, information about the data contained in each file, and (often) a description of how the files were created.

The Path column shows the location of each data set, with respect to $ROOT, the top-level HEMCO directory. For example, on the Harvard disk server, $ROOT points to the directory /mnt/gcgrid/data/ExtData/HEMCO/.

The Status column describes the current status of each data set:

CURRENTLY USED	Denotes that the data set is part of the standard emissions configuration for GEOS-Chem, that is: It is used in the GEOS-Chem 1-month and 1-year full-chemistry benchmark simulations, or It is used in one or more of the GEOS-Chem specialty simulations.
OPTIONAL	Denotes that the data set is not part of the the standard GEOS-Chem emissions configuration. But you can still use the data set in your research applications if you wish.
TO BE ADDED SOON	Denotes that the data set is not yet ready for use with HEMCO, but will be added soon.
OBSOLETE	Denotes that the data set has been removed from the standard GEOS-Chem emissions configuration. In most cases, OBSOLETE means that a newer version of the data is available and should be used instead.
NOT USED	Denotes that the data set is not used in the standard GEOS-Chem emissions configuration, even if it is current. For example, another data source is being used in place of this data set for a particular reason.

If use GEOS-Chem, then we recommend that you download the data sets that are listed as CURRENTLY USED, as these form the standard GEOS-Chem emissions configuration. You are free, however, to use any of the data sets listed below. Your choice of data sets will depend on your particular research needs.

--Bob Y. 10:53, 18 March 2015 (EDT)

Aerosol emissions

The following subdirectories of the HEMCO directory tree contain aerosol emission inventories.

NOTE: AeroCom volcanic SO2 emissions are listed under the Emissions implemented as HEMCO extensions.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
Secondary organic aerosols	README	`$ROOT/SOA/2014-07`	3.0 MB	CURRENTLY USED Contain various inputs for SOA simulations.
Optional inventories (turned OFF by default in the standard emissions configuration)
Spatially varying OM/OC ratios for SOA species	README	`$ROOT/OMOC/v2018-01`	8.6 MB	OPTIONAL Controlled by a switch in `input.geos` (default is OFF)
Obsolete inventories (superseded by newer developments)
AEROCOM volcanic emissions	README	`$ROOT/VOLCANO/v2015-02`	1.6 GB	OBSOLETE Retired in 12.4.0. Superseded by updated AeroCom emissions implemented via the Volcano HEMCO extension.
Tami Bond et al (2007) BC and OC emissions	README	`$ROOT/BCOC_BOND/v2014-07`	3.0 MB	OBSOLETE Retired in 12.5.0. Superseded by CEDS.
Cooke et al BC and OC emissions	README	`$ROOT/BCOC_COOKE/v2014-07`	744 KB	OBSOLETE Superseded by Bond et al (2007).

--Melissa Sulprizio (talk) 14:02, 14 June 2019 (UTC)

Anthropogenic and biofuel emissions

The following subdirectories of the HEMCO directory tree contain inventories of anthropogenic and biofuel emissions.

Please also see list of species included in each of these global inventories and regional inventories.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
APEI Canadian emissions (1989-2014)	README	`$ROOT/APEI/v2016-11/`	68 MB	CURRENTLY USED Introduced in v11-02f
NEI2011 hourly US emissions	README	`$ROOT/NEI2011/v2015-03`	248 GB	CURRENTLY USED Overwrites CO, NO, NO2, HNO2, NH3, CH2O, RCHO, MACR, ACET, ALK4, PRPE, EOH, MOH, XYLE, TOLU, BENZ, SO2, SO4, C2H4, C2H6, C3H8, ALD2, BC, and OC over the USA. Use NEI2011 for simulations covering the period 2006-2013; otherwise use NEI2005.
NEI2011 monthly mean US emissions	README	`$ROOT/NEI2011/v2017-02-MM`	248 GB	CURRENTLY USED Overwrites CO, NO, NO2, HNO2, NH3, CH2O, RCHO, MACR, ACET, ALK4, PRPE, EOH, MOH, XYLE, TOLU, BENZ, SO2, SO4, C2H4, C2H6, C3H8, ALD2, BC, and OC over the USA. Use NEI2011 for simulations covering the period 2006-2013; otherwise use NEI2005.
MIX Asian anthropogenic emissions	README	`$ROOT/MIX/v2015-03`	623 MB	CURRENTLY USED Replaces David Streets et al emissions. The base years for MIX is 2008 and 2010, as opposed to 2006 for Streets.
DICE-Africa anthropogenic emissions	README	`$ROOT/DICE_Africa/v2016-10`	202 MB	CURRENTLY USED Introduced in v11-02f
EDGAR v4.3 anthropogenic emissions	README	`$ROOT/EDGARv43/v2016-11`	6.2 GB	CURRENTLY USED Used for sectors not included in DICE-Africa inventory Can be used instead of CEDS Turning on this option will also include trash burning emissions of NOx, SOx, CO, NH3, BC and OC from Wiedinmyer et al. (2014) and NMVOC emissions from CEDS
CEDS anthropogenic emissions	README	`$ROOT/CEDS/v2018-04`	140 GB	CURRENTLY USED Introduced in v11-02f New default inventory (replaces EDGAR) CEDS is also the default ship emissions inventory in GEOS-Chem 12.1.0 and later versions.
POET (anthropogenic EOH inventory)	README	`$ROOT/POET/v2017-03/`	38 MB	CURRENTLY USED Introduced in v11-02a
C2H6 global emissions from Tzompa et al. (2017)	README	`$ROOT/C2H6_2010/v2019-06`	536 KB	CURRENTLY USED Introduced in v11-02f Overwrites the C2H6 emissions from the CEDS to address underestimates
C3H8 global emissions from Xiao et al. (2010)	README	`$ROOT/XIAO/v2014-09`	308 KB	CURRENTLY USED Overwrites the C3H8 emissions from CEDS to address underestimates
Yevich & Logan biofuels	README	`$ROOT/BIOFUEL/v2014-07`	1.1 MB	CURRENTLY USED Used only for biofuel emissions of C3H8, which are missing from Xiao C3H8 emissions. Retired for all other species in 12.5.0. It is superseded by more current global anthropogenic inventories that already include biofuel emissions.
Anthropogenic PM2.5 dust source (AFCID)	README	`$ROOT/AFCID/2018-04`	4.4 MB	OPTIONAL Introduced in GEOS-Chem 12.1.0. In GEOS-Chem 12.5.0 AFCID was separated from the DEAD dust emissions extension to allow for use with offline dust emissions as well.
Optional inventories (turned OFF by default in the standard emissions configuration)
Trash burning emissions	README	`HEMCO/TrashEmis/v2015-03/`	86 MB	OPTIONAL Introduced in #v11-02f\|v11-02f Used when EDGAR v4.3 anthropogenic emissions are used in place of CEDS
HTAP global anthro+biofuel	README	`$ROOT/HTAP/v2015-03`	4.5 GB	OPTIONAL Can be used instead of CEDS emissions. NOTE: HTAP includes some regional emissions from other inventories. If you select HTAP you might not need to select the other regional inventories in HEMCO. See this document for more information.
MASAGE agricultural NH3	README	`$ROOT/MASAGE_NH3/v2015-02`	4.4 MB	OPTIONAL Adds to the anthropogenic NH3 category.
NEI2011 agricultural emissions only	README	`$ROOT/NEI2011_ag_only/v2015-03`	648 MB	OPTIONAL
Obsolete inventories (superseded by newer developments)
NEI/VISTAS scale factors	README1 README2	`$ROOT/VISTAS/v2014-07 $ROOT/VISTAS/v2014-07/VISTAS_NOX $ROOT/VISTAS/v2014-07/VISTAS_WEWD`	46 MB	OBSOLETE Used to scale NO in the NEI2005 inventory.
RETRO VOC emissions	README	`$ROOT/RETRO/v2014-07/orig_kgC`	38 MB	OBSOLETE Retired in 12.5.0. Superseded by CEDS.
Streets regional anthro	README1 README2	`$ROOT/STREETS/v2014-07`	1.7 MB	OBSOLETE Retired in 12.5.0. Superseded by MIX.
EMEP regional anthropogenic	README	`$ROOT/EMEP/v2015-03`	24 MB	OBSOLETE Retired in 12.5.0. This was the default CO, NH3, NO, SO2, PRPE, ALK4, C2H6, ALD2, and MEK inventory for Europe for versions prior to 12.5.0. The more recent CEDS global emissions are now used over Europe.
BRAVO regional anthropogenic	README	`$ROOT/BRAVO/v2014-07`	68 KB	OBSOLETE Retired in 12.2.0. This was the default CO, NO, and SO2 inventory for Mexico for 12.1.0 and prior versions. The more recent CEDS global emissions are now used over Mexico.
CAC regional anthropogenic	README	`$ROOT/CAC/v2016-09`	29 MB	OBSOLETE Superseded by the APEI historical Canadian emissions
NEI2008 regional anthro/biofuel	README	`$ROOT/NEI2008/v2015-02`	3.0 GB	OBSOLETE Superseded by NEI2011.
EDGAR v4.2 global anthropogenic	README	`$ROOT/EDGARv42/v2015-02 $ROOT/EDGARv42/v2015-02/CO $ROOT/EDGARv42/v2015-02/NH3 $ROOT/EDGARv42/v2015-02/NO $ROOT/EDGARv42/v2015-02/SO2 $ROOT/EDGARv42/v2015-02/VOCv2`	4.5 GB	OBSOLETE Superseded by EDGAR v4.3
GEIA global anthropogenic	README	`$ROOT/GEIA/v2014-07`	4.8 MB	OBSOLETE Slated for replacement by newer inventories
EDGAR v3 global anthropogenic	README	`$ROOT/EDGAR/v2014-07`	40 MB	OBSOLETE EDGAR v3 has been replaced by EDGAR v4.2.

--Melissa Sulprizio (talk) 14:18, 14 June 2019 (UTC)

Anthropogenic aircraft and ship emissions

The following subdirectories of the HEMCO directory tree contain inventories of anthropogenic aircraft and ship emissions.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
AEIC aircraft	README	`$ROOT/AEIC/v2015-01`	2.0 GB	CURRENTLY USED Default global aircraft emissions inventory. Contains fuel burned, NO, CO, and hydrocarbons.
CEDS ship	README	`$ROOT/CEDS/v2018-04`	140 GB	CURRENTLY USED Stored together w/ other CEDS data files.
Optional inventories (turned OFF by default in the standard emissions configuration)
ARCTAS ship emissions (SO2)	README	`$ROOT/ARCTAS_SHIP/v2014-07`	508 KB	OPTIONAL Superseded by CEDS ship emissions in GEOS-Chem 12.1.0 and later versions. See notes below.
ICOADS ship (CO)	README	`$ROOT/ICOADS_SHIP/v2014-07`	4.2 MB	OPTIONAL Superseded by CEDS ship emissions in GEOS-Chem 12.1.0 and later versions. See notes below.
Corbett et al ship emissions (SO2)	README	`$ROOT/CORBETT_SHIP/v2014-07`	1.8 MB	OPTIONAL Superseded by CEDS ship emissions in GEOS-Chem 12.1.0 and later versions. See notes below.
HTAP ship (CO, NO, SO2)	README	`$ROOT/HTAP/v2015-03`	4.5 GB	OPTIONAL Stored together with other HTAP data files. See this document for more information.
NEI2011 ship (several species)	README	`$ROOT/NEI2011/v2015-03`	248 GB	OPTIONAL NOTE: Only extends a few km from land, so this is more of a coastal emissions inventory. It is turned off by default.
Obsolete inventories (superseded by newer developments)
EMEP ship (CO, NO, SO2)	README	`$ROOT/EMEP/v2015-03`	24 MB	OBSOLETE Retired in 12.5.0. The more recent CEDS global emissions are now used over Europe.
EDGAR v3 ship (CO)	README	`$ROOT/EDGAR/v2014-07`	40 MB	OBSOLETE
EDGAR v4.2 ship	README	`$ROOT/EDGARv42/v2015-02`	4.5 GB	NOT USED EDGAR v4.2 ship emissions are not used because they are lumped with other non-road transportation sectors (aircraft, rail, etc), and thus cannot be easily separated.

NOTES about ship emissions:

CEDS ship emissions are the default ship inventory in GEOS-Chem 12.1.0 and later versions.
- Data files for CEDS ship emissions are stored with the other CEDS emission sector files in the HEMCO data path: $ROOT/CEDS/v2018-04/.
If CEDS emissions are turned off above then:
- ARCTAS should be used over ICOADS, CORBETT, and HTAP for SO2
- ICOADS should be used for CO and NO.
The NEI2011 ship inventory only goes a few km from land, so it isn’t a complete "ship inventory". This is turned off by default in the HEMCO configuration files that ship with GEOS-Chem.

--Melissa Sulprizio (talk) 14:27, 14 June 2019 (UTC)

Biomass burning emissions

The following subdirectories of the HEMCO directory tree contain inventories of biomass burning emissions.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
GFED4 biomass burning (v4.1)	README	`$ROOT/GFED4/v2015-10`	692 MB	CURRENTLY USED This is GFED v4.1, which is the default in v11-01 and higher versions Monthly-mean data is available from 1998-2016 Uses daily scale factors from GFED3. Uses 3-hourly scale factors from GFED3.
Optional inventories (turned OFF by default in the standard emissions configuration)
GFAS biomass burning emissions	README	`$ROOT/GFAS/v2018-09`	45 GB	OPTIONAL Monthly data are available from 2003-present and are updated monthly
FINN biomass burning (v1.6)	README	`$ROOT/FINN/v2018-04`	1.1 GB	TO BE ADDED SOON NOTE: Awaiting reprocessed data files to correct an error. Compatible with v11-02 and higher versions
FINN biomass burning (v1.5)	README	`$ROOT/FINN/v2015-02`	689 MB	OPTIONAL Compatible with v11-01
QFED biomass burning (v2.5r1)	README	`$ROOT/QFED/v2018-07`	57 GB	OPTIONAL QFED v2.5r1 data extends from 2000-2017 (at present) Compatible with 12.0.0\|GEOS-Chem 12.0.0
QFED biomass burning (v2.4r6)	README	`$ROOT/QFED/v2014-09`	57 GB	OPTIONAL QFED v2.4r6 data ends in October 2016.
Obsolete inventories (superseded by newer developments)
GFED4 biomass burning (v4.0)	README	`$ROOT/GFED4/v2015-06`	115 MB	OBSOLETE This was the default in v10-01 and prior versions. Superseded by GFED v4.1
GFED3 biomass burning	README	`$ROOT/GFED3/v2014-10`	343 MB	OBSOLETE Retired in GEOS-Chem v11-02
GFED2 biomass burning	README	`$ROOT/GFED2/v2014-07`	196 KB	OBSOLETE Superseded by GFED4.
Duncan et al biomass burning	README	`$ROOT/BIOBURN/v2014-07`	925 MB	OBSOLETE Superseded by GFED4.

Offline grid-independent emissions

Offline grid-independent emissions were generated by running high-resolution (0.25°x0.3125° for GEOS-FP, 0.5°x0.625° for MERRA-2) simulations using the HEMCO standalone and online emissions from the HEMCO extensions.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
Offline dust emissions	README	`$ROOT/OFFLINE_DUST/v2019-01`	18 GB	CURRENTLY USED Introduced in 12.5.0
Offline biogenic VOC emissions	README	`$ROOT/OFFLINE_BIOVOC/v2019-01`	1006 GB	CURRENTLY USED Introduced in 12.5.0
Offline sea salt emissions	README	`$ROOT/OFFLINE_SEASALT/v2019-01`	848 GB	CURRENTLY USED Introduced in 12.5.0
Offline soil NOx emissions	README	`$ROOT/OFFLINE_SOILNOX/v2019-01`	46 GB	CURRENTLY USED Introduced in 12.5.0

Emissions implemented as HEMCO extensions

The following subdirectories of the HEMCO directory tree contain input data used by various HEMCO extensions. These HEMCO extensions compute emissions for quantities that depend on meteorological variables (e.g. emissions from lighting, biogenic processes, etc.).

NOTE: GFED3, GFED4 and FINNv1 are implemented as HEMCO extensions, but we have listed them with the other biomass burning inventories, for clarity.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
Acetone ocean exchange	README	`$ROOT/ACET/v2014-07`	52 KB	CURRENTLY USED
ALD2 ocean exchange	README	`$ROOT/ALD2/v2017-03`	52 KB	CURRENTLY USED
DMS ocean exchange	README	`$ROOT/DMS/v2015-07`	3.0 MB	CURRENTLY USED This is the default in v11-01 and higher versions Uses Lana 2011 climatology
NO from lightning	README	`$ROOT/OFFLINE_LIGHTNING/v2019-01/`	47 GB	CURRENTLY USED Introduced in 12.5.0
PARANOX ship plume model	README	`$ROOT/PARANOX/v2015-02`	162 MB	CURRENTLY USED Computes the aging of emissions in ship exhaust plumes.
AeroCom volcanic emissions	README	`$ROOT/VOLCANO/v2019-08`	660 MB	CURRENTLY USED Updated in 12.6.0
Optional inventories (turned OFF by default in the standard emissions configuration)
DEAD dust model	README	`$ROOT/DUST_DEAD/2014-07`	712 KB	OPTIONAL May be used instead of offline dust emissions
MEGAN biogenic emissions	README	`$ROOT/MEGAN/v2018-05`	12 MB	OPTIONAL May be used instead of offline biogenic VOC emissions
NO from soils/fertilizers	README	`$ROOT/SOILNOX/v2014-07`	79 MB	OPTIONAL May be used instead of offline soil NOx emissions
GINOUX dust model	README	`$ROOT/DUST_GINOUX/2014-07`	36 KB	OPTIONAL You can use this in place of the DEAD dust model.
Obsolete inventories (superseded by newer developments)
NO from lightning	README	`$ROOT/LIGHTNOX/v2017-09`	8.5 MB	OBSOLETE Superseded by OFFLINE_LIGHTNING/2019-01
DMS ocean exchange	README	`$ROOT/DMS/v2014-07`	2.2 MB	OBSOLETE Superseded by the Lana 2011 climatology
MEGAN biogenic emissions	README	`$ROOT/MEGAN/v2015-02`	2.0 MB	OBSOLETE Superseded by `MEGAN/v2017-07` and `MEGAN/v2018-05`.

Future and historical emissions

The following subdirectories of the HEMCO directory tree contain historical and future emissions inventories.

Inventory	Data file info	Path	Directory size	Status
RCP future scenarios	README	`$ROOT/RCP/v2015-02`	368 MB	OPTIONAL RCP emissions are not part of the standard GEOS-Chem emissions configuration but may be used as a research option.

GEOS-Chem specialty simulation data

The following subdirectories of the HEMCO directory tree input data (emissions, oxidants, etc.) for use with the GEOS-Chem specialty simulations. If you do not regularly use these simulations, you may choose not to download these data directories.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
Aerosol-only simulation	README	`$ROOT/OFFLINE_AEROSOL/v2014-09`	165 MB	CURRENTLY USED
CH4 simulation	README	`$ROOT/CH4/v2014-09`	274 MB	CURRENTLY USED
CO2 simulation	README1 README2 README3 README4 README5 README6	`$ROOT/CO2/v2015-04 $ROOT/CO2/v2015-04/BIO/ $ROOT/CO2/v2015-04/BIOFUEL/ $ROOT/CO2/v2015-04/CHEM/ $ROOT/CO2/v2015-04/FOSSIL/ $ROOT/CO2/v2015-04/OCEAN/`	1033 MB	CURRENTLY USED
Mercury simulation	README1 README2 README3 README4 README5 README6 README7 README8 README9 README10	`$ROOT/MERCURY/v2014-09 $ROOT/MERCURY/v2014-09/ARTISANAL $ROOT/MERCURY/v2014-09/BrOx $ROOT/MERCURY/v2014-09/Hg2_PARTITION $ROOT/MERCURY/v2014-09/JVALUES $ROOT/MERCURY/v2014-09/NATURAL $ROOT/MERCURY/v2014-09/NEI2005 $ROOT/MERCURY/v2014-09/OCEAN $ROOT/MERCURY/v2014-09/SOIL $ROOT/MERCURY/v2014-09/STREETS`	342 MB	CURRENTLY USED
POPs simulation	README	`$$ROOT/POPs/v2015-08`	809 MB	CURRENTLY USED Data corresponds to the POPs simulation update in v11-01c
RRTMG radiative transfer model	README	`$ROOT/RRTMG/v2018-11`	19 MB	CURRENTLY USED Used in GEOS-Chem 12.1.0 and later versions
Tagged CO simulation	README	`$ROOT/TAGGED_CO/v2017-04`	260 KB	CURRENTLY USED Contains files for the updated Tagged CO simulation in GEOS-Chem v11-02
Tagged O3 simulation	README	`$ROOT/TAGGED_O3/v2014-09`	372 MB	CURRENTLY USED
O3 for offline simulations	README	`$ROOT/O3/v2014-09`	130 MB	CURRENTLY USED
OH for offline simulations	README1 README2	`$ROOT/OH/v2014-09 $ROOT/OH/v2014-09/v5-07-08 $ROOT/OH/v2014-09/v7-02-03.GMI`	148 MB	CURRENTLY USED
H2O2 for offline simulations	README	`$ROOT/OXIDANTS/v2014-07`	32 MB	CURRENTLY USED
Oceanic Chlorophyll-A for Hg simulations	README	`$ROOT/CHLA/v2014-07`	2.0 MB	CURRENTLY USED
Obsolete inventories (superseded by newer developments)
CH3I simulation	README	`$ROOT/CH3I/v2014-07`	280 KB	OBSOLETE This simulation is no longer used in GEOS-Chem (awaiting revival)
POPs simulation	README	`$ROOT/POPs/v2014-09`	622 MB	OBSOLETE Superseded by `v2015-08`
Tagged CO simulation	README	`$ROOT/TAGGED_CO/v2014-08`q	260 KB	OBSOLETE Superseded by `v2017-04`

--Bob Yantosca (talk) 19:01, 2 July 2018 (UTC)

Halogen emissions

The following subdirectories of the HEMCO directory tree contain inventories of bromine and iodine emissions.

NOTE: See our Non-emissions data section for information about stratospheric bromine concentration data.

Inventory	Data file info	Path	Directory size	Status
Liang et al VSL emissions	README	`$ROOT/BROMINE/v2015-02`	156 KB	CURRENTLY USED
Ordonez et al Iodine emissions	README	`$ROOT/IODINE/v2017-09`	4.4 MB	CURRENTLY USED Introduced in v11-02

--Bob Yantosca (talk) 19:02, 2 July 2018 (UTC)

Natural emissions data

The following subdirectories of the HEMCO directory tree contain inventories natural emissions.

Inventory	Data file info	Path	Directory size	Status
GEIA NH3 (natural source)	README	`$ROOT/NH3/v2014-07`	8.1 MB	CURRENTLY USED
NH3 emissions from arctic sea birds	README	`HEMCO/NH3/v2018-04/`	104 MB	CURRENTLY USED Introduced in v11-02f

Non-emissions data

The following subdirectories of the HEMCO directory tree input data contains non-emissions data sets. Most of these are used as inputs to GEOS-Chem's chemistry modules (i.e. photolysis, stratospheric chemistry, etc.).

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
GMI strat chem mechanism	README	`$ROOT/GMI/v2015-02`	16 GB	CURRENTLY USED Used to compute P & L of species in the stratosphere.
Stratospheric Bry from CCM	README	`$ROOT/STRAT/v2015-01/Bry`	385 MB	CURRENTLY USED Required for the for the full-chemistry simulations.
Timezone offsets from UTC	README	`$ROOT/TIMEZONES/v2015-02`	264 KB	CURRENTLY USED Used by HEMCO to compute emissions that depend on local time rather than on UTC time.
TOMS/SBUV O3 columns	README	`$ROOT/TOMS_SBUV/v2016-11`	21 MB	CURRENTLY USED This is default in v11-01 and higher versions. These files are the same data as in `$ROOT/TOMS_SBUV/v2015-03`, but were reprocessed by Barron Henderson in order in order to fix a strange cycle in OH output when running GEOS-Chem with GEOS-5 met. Ignored if you are using GEOS-FP or MERRA-2 meteorology.
UCX chemistry mechanism	README	`$ROOT/UCX/v2018-02`	12 GB	CURRENTLY USED Used to compute P & L of species in the stratosphere. Can be used instead of GMI.
UV surface albedoes	README	`$ROOT/UVALBEDO/v2015-03`	476 KB	CURRENTLY USED Required inputs for the FAST-JX v7.0 photolysis mechanism
Future inventories (to be added soonObsolete inventories (superseded by newer developments)
MODIS XLAI (leaf area index per land type)	README	`$ROOT/MODIS_XLAI/v2017-07`	203 MB	TO BE ADDED SOON To be added in GEOS-Chem 12.3.0
Olson land map (masks for each land type)	README	`$ROOT/OLSON_MAP/v2019-02`	1.9 MB	TO BE ADDED SOON To be added in GEOS-Chem 12.3.0 Used for regridding of MODIS_XLAI or Yuan_XLAI via HEMCO
Yuan-processed MODIS XLAI (leaf area index per land type)	README	`$ROOT/Yuan_XLAI/v2019-03`	203 MB	TO BE ADDED SOON Will become the default option in GEOS-Chem 12.3.0
Obsolete inventories (superseded by newer developments)
TOMS/SBUV O3 columns	README	`$ROOT/TOMS_SBUV/v2015-03`	17 MB	OBSOLETE Superseded by `v2016-11`

--Bob Yantosca (talk) 15:50, 11 March 2019 (UTC)

Oceanic emissions

The following folders contain data used to compute oceanic emissions of GEOS-Chem species.

Inventory	Data file info	Path	Directory size	Status
Fields to compute ALD2 emissions Seawater concentration of acetaldehyde Heterotrophic respiration rates, used to compute biogenic emissions of ALD2 and EOH	README	`$ROOT/ALD2/v2017-03`	0.5 MB	CURRENTLY USED Introduced with the PAN updates in v11-02a.

--Bob Yantosca (talk) 17:14, 28 June 2018 (UTC)

Other inputs for HEMCO

The following subdirectories of the HEMCO directory tree input data for various HEMCO functions. These include regional masks, emission scale factors, and grid information.

Inventory	Data file info	Path	Directory size	Status
Active inventories (turned ON by default in the standard emissions configuration)
Annual scale factors	README	`$ROOT/AnnualScalar/v2014-07`	3.0 MB	CURRENTLY USED Used to scale NEI2005 and other emissions to years other than the inventory base year.
NEI2005 scale factors	README	`$ROOT/NEI2005/v2014-09`	8.1 MB	CURRENTLY USED
ID codes for each country	README	`$ROOT/COUNTRY_ID/v2015-04`	15 MB	CURRENTLY USED ISO ALPHA-3 standard country codes are contained on an 0.1° x 0.1° grid. HEMCO can use these ID's to apply country-level scale factors to any emissions field.
Mask files for regional emissions	README	`$ROOT/MASKS/v2014-07`	51 MB	CURRENTLY USED Masks define the geographical regions where the various regional emissions (e.g. BRAVO, CAC, NEI) are to be applied.
MAP_A2A regridding data	README	`$ROOT/MAP_A2A/v2014-07`	152 KB	CURRENTLY USED
Obsolete inventories (superseded by newer developments)
Weekly scale factors	README	`$ROOT/WEEKSCALE/v2014-07`	4.0 KB	OBSOLETE Not currently in use

--Bob Yantosca (talk) 19:05, 2 July 2018 (UTC)

Downloading the HEMCO data directories

The GEOS-Chem Support Team has created a package called hemco_data_download. With this package, you can download the various emissions inventories and related data files for HEMCO to your own disk server. Furthermore, you can specify which data directories that you would like to download (as well as those you would like to ignore) via a configuration file.

Obtaining the hemco_data_download package

To obtain the hemco_data_download package, use Git to clone this repository

git clone https://github.com/GCST/hemco_data_download.git

This will create a directory named hemco_data_download, in which you should see the following files:

File	Description
`README`	File with an overall description of the directory contents
`hemcoDataDownload.pl`	Perl script to download HEMCO data directories
`hemcoDataDownload.rc`	Configuration file for the `hemcoDataDownload.pl` script. In this file you can specify which HEMCO data directories you would like to download and which you would like to omit.
`forTesting.rc`	A configuration file that you can use for testing or debugging. This will tell `hemcoDataDownload.pl` only to download a couple of emissions inventories with files that do not take up much disk space.

--Bob Yantosca (talk) 17:02, 5 December 2016 (UTC)

Setting up the configuration file

The configuration files (i.e. hemcoDataDownload.rc and forTesting.rc) are pretty much self-explanatory.

At the top of the configuration file you will see this section:

###############################################################################
#                                                                             #
#  Specify the remote and local HEMCO data paths, plus other options.         #
#                                                                             #
###############################################################################

Remote HEMCO data path | ftp://ftp.as.harvard.edu/gcgrid/data/ExtData/HEMCO
Your HEMCO data path   | /as/scratch/bmy/HEMCO
Verbose output         | yes
Dryrun only?           | no

Path	Description
`Remote HEMCO data path`	Location on the FTP server from which you are going to download the data. This can be from either Harvard or from Dalhousie. (For now we will use the Harvard server). You can edit this accordingly.
`Your HEMCO data path`	The root-level directory for HEMCO data on your own disk space. If you are not sure where to place this, then ask your sysadmin.
`Verbose output`	Lets you specify if you want to print out extra output during the download process. This can be set to either "yes" or "no".
`Dryrun only`	Allows you to print out the data download commands without actually downloading the data. This is useful for debugging. This can be set to either "yes" or "no".

In the next section you specify all of the HEMCO inventories that you want to download. You will see this header:

###############################################################################
#                                                                             #
#  THE FOLLOWING DATA DIRECTORIES WILL BE DOWNLOADED.                         #
#                                                                             #
#  These data directories comprise the recommended emissions configuration    #
#  for typical GEOS-Chem full-chemistry and specialty simulations.            #
#                                                                             #
#  NOTE: In most cases, you only have to specify the top-level folder.        #
#  All subfolders will be downloaded automatically.                           #
#                                                                             #
###############################################################################

#=============================+================================================
# AEROSOLS                    | Directory paths
#=============================+================================================
AEROCOM volcano emissions     | $ROOT/VOLCANO/v2014-10
Bond et al BC/OC              | $ROOT/BCOC_BOND/v2014-07
Cooke et al BC/OC             | $ROOT/BCOC_COOKE/v2014-07
Secondary organic aerosols    | $ROOT/SOA/v2014-07
... etc ...

Each line specifies the name of a HEMCO emissions inventory and the data path where it can be found on disk, relative to the root data path. NOTE: The script will replace the $ROOT token with the value you gave to the "HEMCO remote data path" above. (Lines starting with the comment character # will be ignored.)

Any inventory found in this section will be downloaded. To prevent an inventory from being downloaded you can either comment it out (i.e. place a # in the first column) or move the inventory to the next section.

The final section specifies HEMCO emission inventories that you do not wish to download. The section looks like this:

###############################################################################
#                                                                             #
#  THE FOLLOWING DATA DIRECTORIES WILL NOT BE DOWNLOADED.                     #
#                                                                             #
#  These data directories contain are optional emissions inventories that     #
#  are not used in typical GEOS-Chem simulations.  If you wish to download    #
#  any of these inventories, simply move the corresponding entry for each     #
#  inventory to the previous section.                                         #
#                                                                             #
###############################################################################

CH3I simulation (obsolete)    | $ROOT/CH3I/v2014-07
Chlorophyll A                 | $ROOT/CHLA/v2014-07
... etc ...

--Bob Y. 13:55, 12 February 2015 (EST)

Downloading the data

Once you have set up your configuration file, you can run the hemcoDataDownload.pl script to start downloading the HEMCO data to your local server. To run the script you can type:

hemcoDataDownload.pl

If you do not specify a configuration file name, then the hemcoDataDownload.pl scriptwill read the default configuration file hemcoDataDownload.rc configuration file. If you wish to specify a different configuration file name, simply pass that as an argument to the script, e.g.

hemcoDataDownload.pl myNewConfigFile.rc

Before you start downloading GB's of data, we recommend that you run a short test to make sure that the data directories are being copied to the proper locations on your disk server. For this purpose, we have provided a configuration file named forTesting.rc. Typing

hemcoDataDownload.pl forTesting.pl

will only download a couple of data inventories that do not take up much disk space. This allows you to ensure that the data transfer is sucessful without making you wait a long time.

--Bob Y. 13:57, 12 February 2015 (EST)

New features for the GEOS-Chem v10-01 public release

For the GEOS-Chem v10-01 public release, we modified the default download options in the hemcoDataDownload.pl script. We changed the default wget options from:

wget r -nH -q ...

to

wget -r -nH -c -N -q ...

This will tell wget to only download new or modified files, instead of trying to download the entire data archive from scratch. This should hopefully subsequent data download processes faster.

--Bob Y. (talk) 18:35, 16 June 2015 (UTC)

Submitting new data for use with HEMCO

If you have a new emissions inventory or other atmospheric data set that you would like to add to the HEMCO data directories, then please contact the GEOS-Chem Support Team. Data files must be in COARDS-compliant or CF-compliant netCDF format. Please see our Preparing data files for use with HEMCO wiki page for more information.

--Bob Y. 11:49, 5 March 2015 (EST)

HEMCO data directories

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