HEMCO data directories

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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)

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:
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.

Inventory Data file info Path Directory size Status
AEROCOM volcanic emissions README $ROOT/VOLCANO/v2015-02 1.6 GB CURRENTLY USED
  • Default global inventory for volcanic SO2.
Tami Bond et al (2007) BC and OC emissions README $ROOT/BCOC_BOND/v2014-07 3.0 MB CURRENTLY USED
  • Default global inventory for black carbon (BC) and organic carbon (OC).
Secondary organic aerosols README $ROOT/SOA/2014-07 3.0 MB CURRENTLY USED
  • Contain various inputs for SOA simulations.
Cooke et al BC and OC emissions README $ROOT/BCOC_COOKE/v2014-07 744 KB OPTIONAL
  • Can be used in place of Bond et al (2007).

--Bob Y. 10:15, 18 March 2015 (EDT)

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
Inventories that are activated by default in the HEMCO configuration file for the current GEOS-Chem public release (v11-01)
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 CURRENTLY USED
  • Default global inventory for NOx, CO, SO2, and NH3 (replaces EDGAR v3).
  • The following sectors are not used:
    • EDGAR v4.2 ship emissions
    • EDGAR v4.2 soil NO emissions
    • EDGAR v4.2 biomass emissions
  • NAP is still taken from EDGAR v2 data.
GEIA NH3 (anthro, biofuel, natural source) README $ROOT/NH3/v2014-07 8.1 MB CURRENTLY USED
  • Default global inventory for biofuel & natural NH3.
  • Anthro NH3 is overwritten by EDGAR v4.2
  • Slated for replacement after GEOS-Chem v10-01 ships.
RETRO VOC emissions README $ROOT/RETRO/v2014-07/orig_kgC 38 MB CURRENTLY USED
Yevich & Logan biofuels README $ROOT/BIOFUEL/v2014-07 1.1 MB CURRENTLY USED
  • Default global biofuel emissions inventory.
BRAVO regional anthropogenic README $ROOT/BRAVO/v2014-07 68 KB CURRENTLY USED
  • Overwrites CO, NO, and SO2 over Mexico.
CAC regional anthropogenic README $ROOT/CAC/v2016-09 29 MB CURRENTLY USED
  • This is the default CAC inventory in v11-01 and higher versions
  • Overwrites CO, NO, NH3, and SOx over Canada.
  • Includes data at 0.1° x 0.1° resolution
EMEP regional anthropogenic README $ROOT/EMEP/v2015-03 24 MB CURRENTLY USED
  • Overwrites CO, NH3, NO, SO2, PRPE, ALK4, C2H6, ALD2, and MEK over Europe.
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.
NEI2005 regional anthro/biofuel README $ROOT/NEI2005/v2014-09 8.1 MB CURRENTLY USED
  • Overwrites ACET, ALK4, ALD2, BC, C2H6, C3H8, CO, CH2O, MEK, NH3, NIT, NO, OC, PRPE, SO2, and SO4 over the USA.
  • Use NEI2011 for simulations covering the period 2006-2013; otherwise use NEI2005.
  • NOTE: NEI2005 is eventually going to be retired.
NEI/VISTAS scale factors README1
README2
$ROOT/VISTAS/v2014-07
$ROOT/VISTAS/v2014-07/VISTAS_NOX
$ROOT/VISTAS/v2014-07/VISTAS_WEWD
46 MB CURRENTLY USED
  • Used to scale NO in the NEI2005 inventory.
NEI2011 regional anthro/biofuel (hourly data) 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 agricultural emissions only README $ROOT/NEI2011_ag_only/v2015-03 648 MB CURRENTLY USED
Yaping Xiao et al C2H6 and C3H8 anthropogenic README $ROOT/XIAO/v2014-09 308 KB CURRENTLY USED
Inventories that are deactivated by default in the HEMCO configuration file for the current GEOS-Chem public release (v11-01).
You can use any of these inventories for your own research needs.
MASAGE agricultural NH3 README $ROOT/MASAGE_NH3/v2015-02 4.4 MB OPTIONAL
  • Adds to the anthropogenic NH3 category.
HTAP global anthro+biofuel README $ROOT/HTAP/v2015-03 4.5 GB OPTIONAL
  • Can be used instead of EDGAR v4.2 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.
Streets regional anthro README1
README2
$ROOT/STREETS/v2014-07 1.7 MB OPTIONAL
  • Streets is being retired in favor of MIX.
  • We will keep Streets as a research option. You may use it if you wish.
NEI2008 regional anthro/biofuel README $ROOT/NEI2008/v2015-02 3.0 GB OPTIONAL
  • We shall keep this as a research option
  • NEI2008 is superseded by NEI2011.
Inventories that will become default settings in the next GEOS-Chem public release (v11-02)
NEI2011 regional anthro/biofuel (monthly mean data) README $ROOT/NEI2011/v2017-02-MM TBD TO BE ADDED SOON
  • New monthly mean data files have been created from the existing hourly data in NEI2011/v2015-03.
  • Reading monthly mean data can substantially reduce the I/O burden in GEOS-Chem simulations.
  • This will be the default in v11-02a and higher versions.
POET anthropogenic emissions README HEMCO/POET/v2017-03/ 44 KB TO BE ADDED SOON
Inventories that have been superseded by newer developments.
You can still use these for your own research needs, if necessary.
CAC regional anthropogenic
(1° x 1° resolution)
README $ROOT/CAC/v2014-07 384 KB OBSOLETE
  • This was the default CAC inventory for v10-01 and prior versions
  • Superseded by v2016-09
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

--Bob Yantosca (talk) 17:39, 25 April 2017 (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
AEIC aircraft README $ROOT/AEIC/v2015-01 2.0 GB CURRENTLY USED
  • Default global aircraft emissions inventory.
  • Contains fuel burned, NO, CO, and hydrocarbons.
ARCTAS ship emissions (SO2) README $ROOT/ARCTAS_SHIP/v2014-07 508 KB CURRENTLY USED
  • Default inventory for ship SO2.
  • Overwritten by EMEP over Europe.
ICOADS ship (CO) README $ROOT/ICOADS_SHIP/v2014-07 4.2 MB CURRENTLY USED
  • Default inventory for ship CO.
  • Overwritten by EMEP over Europe.
EMEP ship (CO, NO, SO2) README $ROOT/EMEP/v2015-03 24 MB CURRENTLY USED
  • Overwrites ship CO, NO, SO2 over Europe.
  • Stored together w/ other EMEP data files.
Corbett et al ship emissions (SO2) README $ROOT/CORBETT_SHIP/v2014-07 1.8 MB OPTIONAL
  • Can be used to overwrite ARCTAS ship SO2.
HTAP ship (CO, NO, SO2) README $ROOT/HTAP/v2015-03 4.5 GB OPTIONAL
NEI2011 ship (several species) README $ROOT/NEI2011/v2015-03 248 GB OPTIONAL
  • Can be used to overwrite the following ship emissions over North America: NO, NO2, HONO, CO, NH3, CH2O, RCHO, MACR, ACET, C3H8, MEK, ALK4, PRPE, EOH, MOH, XYLE, TOLU, BENZ, SO2, SO4, C2H4, C2H6, ALD2, BCPI, BCPO, OCPI, OCPO.
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.

--Bob Y. 10:07, 18 March 2015 (EDT)

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
GFED4 biomass burning 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 1998-2014
  • Uses daily scale factors from GFED3.
  • Uses 3-hourly scale factors from GFED3.
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 CURRENTLY USED
  • GEOS-Chem benchmarks now use GFED4 monthly data, but
    • The GFED_daily option reads daily scale factors from the GFED3 data directory.
    • The GFED_3hourly option reads 3-hourly scale factors from the GFED3 data directory.
FINNv1 biomass burning README $ROOT/FINN/v2015-02 689 MB OPTIONAL
  • You may choose to replace GFED with FINN for research purposes.
  • If you do not need FINN, you may choose not to download it, in order to save disk space.
QFED biomass burning README $ROOT/QFED/v2014-09 57 GB OPTIONAL
  • You may choose to replace GFED with QFED for research purposes.
  • If you do not need QFED, you may choose not to download it, in order to save disk space.
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.

--Bob Yantosca (talk) 15:57, 19 December 2016 (UTC)

Bromine emissions

The following subdirectories of the HEMCO directory tree contain inventories of bromine 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

--Bob Y. 15:03, 17 March 2015 (EDT)

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
Acetone ocean exchange README $ROOT/ACET/v2014-07 52 KB CURRENTLY USED
DEAD dust model README $ROOT/DUST_DEAD/2014-07 712 KB CURRENTLY USED
  • Default dust mobilization scheme
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
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 CURRENTLY USED
  • Default global biogenic emissions inventory.
NO from lightning README $ROOT/LIGHTNOX/v2014-07 13 MB CURRENTLY USED
NO from soils/fertilizers README $ROOT/SOILNOX/v2014-07 79 MB CURRENTLY USED
PARANOX ship plume model README $ROOT/PARANOX/v2015-02 162 MB CURRENTLY USED
  • Computes the aging of emissions in ship exhaust plumes.
GINOUX dust model README $ROOT/DUST_GINOUX/2014-07 36 KB OPTIONAL
  • You can use this in place of the DEAD dust model.

--Bob Yantosca (talk) 15:59, 19 December 2016 (UTC)

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.

--Bob Y. 15:04, 17 March 2015 (EDT)

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
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
README $ROOT/POPs/v2014-09 622 MB OBSOLETE
  • Superseded by v2015-08
Tagged CO simulation README $ROOT/TAGGED_CO/v2014-08 260 KB CURRENTLY USED
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
CH3I simulation README $ROOT/CH3I/v2014-07 280 KB OBSOLETE
  • This simulation is no longer used in GEOS-Chem (awaiting revival)

--Bob Yantosca (talk) 16:02, 19 December 2016 (UTC)

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
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
README $ROOT/TOMS_SBUV/v2015-03 17 MB OBSOLETE
  • This is the default in v10-01 and prior versions
  • Superseded by v2016-11
UV surface albedoes README $ROOT/UVALBEDO/v2015-03 468 KB CURRENTLY USED

--Bob Yantosca (talk) 16:07, 19 December 2016 (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 TO BE ADDED SOON

--Bob Yantosca (talk) 16:59, 25 April 2017 (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
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.
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
Weekly scale factors README $ROOT/WEEKSCALE/v2014-07 4.0 KB OBSOLETE
  • Not currently in use

--Bob Y. 15:08, 17 March 2015 (EDT)

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://bitbucket.org/gcst/hemco_data_download.git

This will create a directory named hemco_data_download, in which you should see theR 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)