Downloading GEOS-Chem source code and data

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This page describes where you can obtain the GEOS-Chem source code and required data files.

What you need to download before you can run GEOS-Chem

Many of the required software packages mentioned on Our GEOS-Chem basics wiki page (e.g. the operating system, the Git version control system, etc.) will already come pre-installed on your system. The most important items that you will need to download to your system are the following:

Item Description
A netCDF library installation. Most of the data files read by GEOS-Chem v11-01 are now in COARDS-compliant netCDF format. As part of our High-Performance Computing (HPC) GEOS-Chem project, we are in the process of converting the remaining binary data files to netCDF format. This will facilitate running GEOS-Chem in (HPC) environments, such as our efforts to interface GEOS-Chem with the NASA GEOS-5 GCM.

If you are using a shared computer system, then your IT staff may have already pre-built a version of the netCDF library that you can load into your Unix environment. If not, then you can build a netCDF library with our installer package.

For more information, please see the following resources:

GEOS–Chem shared data directories. The GEOS-Chem shared data directories contain many large files, such as:

These data directories are too large to fit into your own personal disk quota. We recommend that you (or your IT staff) download the shared data directories to a common disk space where all GEOS-Chem users in your group can access them.

You will only need to download the shared data directories from disk once from scratch. As new met fields or emissions data are added, you can download the new folders and files individually.

For more information, please see the following resources:

GEOS–Chem source code directory. This is the directory where the Fortran-90 source code files (i.e. *.F, *.F90 files) and Makefiles reside. Your Fortran compiler will create an executable (geos) from these source code files.

You can use Git to download the GEOS-Chem source code into your own personal disk space from our GEOS-Chem repository on Bitbucket.org. For more information, please see Chapter 5 of the GEOS-Chem User's Guide.

GEOS–Chem run directories. You can create run directories for the various GEOS-Chem simulations with our GEOS-Chem Unit Tester. You can store the run directories in your personal disk space.

For more information, please see the following resources:

--Bob Yantosca (talk) 21:38, 19 December 2016 (UTC)

Shared data directory archives

There are currently three data archives from which you may download the GEOS–Chem shared data directories:

  1. Harvard data directory archive (ftp.as.harvard.edu) - Recommended for emissions data
  2. Dalhousie data directory archive (rain.ucis.dal.ca) - Recommended for met fields
  3. Compute Canada data directory archive (http://geoschemdata.computecanada.ca) - For 0.5° x 0.625° global MERRA-2 met fields

The GEOS-Chem met fields are currently processed at Dalhousie University. The Dalhousie archive, as a result, includes met fields for more recent dates than the Harvard archive. In addition, Dalhousie archive data files for the various nested grids that may not available be on the Harvard archive.

Conversely, emissions data for HEMCO and non-emissions data for GEOS-Chem chemistry modules are frequently processed at Harvard University. Therefore, we recommend downloading those data from the Harvard archive.

--Melissa Sulprizio (talk) 14:22, 24 March 2017 (UTC)

Harvard data directory archive

You can access the primary GEOS-Chem data download site via anonymous FTP at:

ftp ftp.as.harvard.edu

We recommend that you use the wget utility to download these directories instead of anonymous FTP. Wget allows you to download multiple directories at once, with a command such as this one:

wget -r -nH --cut-dirs=4 "ftp://ftp.as.harvard.edu/DIRECTORY_NAME"

See the tables below for the DIRECTORY_NAME options.

Downtime

The Harvard FTP archive will be unavailable during the weekly maintenance period every Monday between 7-10 AM ET. Please plan your data downloads accordingly.

Directories for met fields and emissions data

If you are downloading the GEOS-FP, MERRA, or MERRA-2 met data, then please note the following:

  1. You will need to download the "CN" (constant) data files for each horizontal grid that you are using.
    • For GEOS-FP these are timestamped for 2011/01/01 and are found in these data directories of ftp.as.harvard.edu:
      • gcgrid/geos-chem/data/GEOS_4x5.d/GEOS_FP/2011/01/GEOSFP.20110101.4x5.nc
      • gcgrid/geos-chem/data/GEOS_2x2.5.d/GEOS_FP/2011/01/GEOSFP.20110101.2x25.nc
      • gcgrid/geos-chem/data/GEOS_0.25x0.3125_NA.d/GEOS_FP/2011/01/GEOSFP.20110101.0.25x0.3125.NA.nc
    • For MERRA these are timestamped for 2000/01/01 and are found in these data directories of ftp.as.harvard.edu:
      • gcgrid/geos-chem/data/GEOS_4x5.d/MERRA/2000/01/20000101.cn.4x5
      • gcgrid/geos-chem/data/GEOS_2x2.5.d/MERRA/2000/01/20000101.cn.2x25
    • For MERRA-2 these are timestamped for 2015/01/01 and are found in these data directories of ftp.as.harvard.edu:
      • gcgrid/geos-chem/data/GEOS_4x5.d/MERRA2/2015/01/20150101.cn.4x5
      • gcgrid/geos-chem/data/GEOS_2x2.5.d/MERRA2/2015/01/20150101.cn.2x25
      • gcgrid/geos-chem/data/GEOS_0.5x0.625_NA.d/MERRA2/2015/01/MERRA2.20150101.0.5x0.625.NA.nc

The path gcgrid/geos-chem/data/ExtData/ (also reachable as gcgrid/data/ExtData/) is the root path under which the GEOS–Chem shared data directories reside. This is where you will find the GEOS-Chem met fields and emissions data.

Starting with GEOS-Chem v10-01, the data directory naming structure has changed since we no longer need to store emissions data on multiple grids. All of the GEOS-Chem data directories are now subdirectories of the ExtData directory. For more information, please see our Setting up the ExtData directory wiki page.

Directory Description
gcgrid/geos-chem/data/ExtData/ Root Data Directory
gcgrid/geos-chem/data/ExtData/CHEM_INPUTS/ Contains non-emissions data for GEOS-Chem chemistry modules
gcgrid/geos-chem/data/ExtData/HEMCO/ Contains emissions data for the HEMCO emissions component
0.25° x 0.3125° Data Directories Description
gcgrid/geos-chem/data/ExtData/GEOS_0.25x0.3125_CH/GEOS_FP/YYYY/MM/ GEOS-FP met fields for 0.25° x 0.3125° CH nested grid simulations
gcgrid/geos-chem/data/ExtData/GEOS_0.25x0.3125_NA/GEOS_FP/YYYY/MM/ GEOS-FP met fields for 0.25° x 0.3125° NA nested grid simulations
0.5° x 0.666° Data Directories Description
gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.666_CH/GEOS_5/YYYY/MM/ GEOS-5 met fields for 0.5° x 0.666° CH nested grid simulations
gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.666_NA/GEOS_5/YYYY/MM/ GEOS-5 met fields for 0.5° x 0.666° NA nested grid simulations
0.5° x 0.625° Data Directories Description
gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.625_AS/MERRA2/YYYY/MM/ GEOS-5 met fields for 0.5° x 0.666° AS nested grid simulations
gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.625_NA/MERRA2/YYYY/MM/ GEOS-5 met fields for 0.5° x 0.666° NA nested grid simulations
2° x 2.5° Data Directories Description
gcgrid/geos-chem/data/ExtData/GEOS_2x2.5/GEOS_4_v4/YYYY/MM/ GEOS-4 met fields for 2° x 2.5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_2x2.5/GEOS_5/YYYY/MM GEOS-5 met fields for 2° x 2.5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_2x2.5/GEOS_FP/YYYY/MM GEOS-FP met data for 2° x 2.5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_2x2.5/MERRA/YYYY/MM MERRA met fields for 2° x 2.5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_2x2.5/MERRA2/YYYY/MM MERRA-2 met fields for 2° x 2.5° global simulations
4° x 5° Data Directories Description
gcgrid/geos-chem/data/ExtData/GEOS_4x5/GEOS_4_v4/YYYY/MM/ GEOS-4 met fields for 4° x 5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_4x5/GEOS_5/YYYY/MM/ GEOS-5 met fields for 4° x 5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_4x5/GEOS_FP/YYYY/MM/ GEOS-FP met fields for 4° x 5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_4x5/MERRA/YYYY/MM/ MERRA met fields for 4° x 5° global simulations
gcgrid/geos-chem/data/ExtData/GEOS_4x5/MERRA2/YYYY/MM/ MERRA-2 met fields for 4° x 5° global simulations

--Bob Yantosca (talk) 22:44, 19 December 2016 (UTC)

Directories for 1-month and 1-year benchmarks

You can find output files and evaluation plots for 1-month and 1-year benchmark simulations in the following directories:

Directory Description
gcgrid/geos-chem/1mo_benchmarks/ Contains the following types of data from the 1-month benchmark simulations that are used to evaluate GEOS-Chem:
  • Restart files
  • Model output (bpch and netCDF formats)
  • Log files
  • Input files
  • Evaluation plots
gcgrid/geos-chem/1yr_benchmarks/ Contains the following types of data from the 1-year benchmarks used to evaluate GEOS-Chem:
  • Restart files
  • Model output (bpch and netCDF formats)
  • Log files
  • Input files
  • Evaluation plots

--Bob Yantosca (talk) 21:46, 19 December 2016 (UTC)

Dalhousie data directory archive

The GEOS-Chem data and meteorological fields used by Dalhousie University are also available via anonymous FTP from:

ftp rain.ucis.dal.ca

We recommend that you use the wget utility to download these directories instead of anonymous FTP. Wget allows you to download multiple directories at once. The Wget command will take the form:

wget -r -nH --cut-dirs=4 "ftp://rain.ucis.dal.ca/DIRECTORY_NAME"

See the table below for the DIRECTORY_NAME options.

Dalhousie directory structure

If you are downloading the GEOS-FP, MERRA, or MERRA-2 met data, then please note the following:

  1. You will need to download the "CN" (constant) data files for each horizontal grid that you are using.
    • For GEOS-FP these are timestamped for 2011/01/01 and are found in these data directories of rain.ucis.dal.ca:
      • ctm/GEOS_4x5.d/GEOS_FP/2011/01/GEOSFP.20110101.4x5.nc
      • ctm/GEOS_2x2.5.d/GEOS_FP/2011/01/GEOSFP.20110101.2x25.nc
      • ctm/GEOS_0.25x0.3125_CH.d/GEOS_FP/2011/01/GEOSFP.20110101.0.25x0.3125.CH.nc
      • ctm/GEOS_0.25x0.3125_EU.d/GEOS_FP/2011/01/GEOSFP.20110101.0.25x0.3125.EU.nc
      • ctm/GEOS_0.25x0.3125_NA.d/GEOS_FP/2011/01/GEOSFP.20110101.0.25x0.3125.NA.nc
    • For MERRA these are timestamped for 2000/01/01 and are found in these data directories of ftp.as.harvard.edu:
      • ctm/GEOS_4x5.d/MERRA/2000/01/20000101.cn.4x5
      • ctm/GEOS_2x2.5.d/MERRA/2000/01/20000101.cn.2x25
    • For MERRA-2 these are timestamped for 2015/01/01 and are found in these data directories of ftp.as.harvard.edu:
      • ctm/GEOS_4x5.d/MERRA2/2015/01/20150101.cn.4x5
      • ctm/GEOS_2x2.5.d/MERRA2/2015/01/20150101.cn.2x25
      • ctm/GEOS_0.5x0.625_AS.d/MERRA2/2015/01/MERRA2.20150101.0.5x0.625.AS.nc
      • ctm/GEOS_0.5x0.625_EU.d/MERRA2/2015/01/MERRA2.20150101.0.5x0.625.EU.nc
      • ctm/GEOS_0.5x0.625_NA.d/MERRA2/2015/01/MERRA2.20150101.0.5x0.625.NA.nc


Global MERRA-2 data at 0.5° x 0.625° resolution have been moved to the Compute Canada data directory archive.

Directory Description
ctm/ExtData/ Root Data Directory
ctm/CHEM_INPUTS/ Contains non-emissions data for GEOS-Chem chemistry modules
ctm/ExtData/HEMCO/ Contains emissions data for the HEMCO emissions component
0.25° x 0.3125° Data Directories Description
ctm/GEOS_0.25x0.3125_CH.d/GEOS_FP/YYYY/MM GEOS-FP met fields for 0.25° x 0.3125° CH nested grid simulations
ctm/GEOS_0.25x0.3125_EU.d/GEOS_FP/YYYY/MM GEOS-FP met fields for 0.25° x 0.3125° EU nested grid simulations
ctm/GEOS_0.25x0.3125_NA.d/GEOS_FP/YYYY/MM GEOS-FP met fields for 0.25° x 0.3125° NA nested grid simulations
0.5° x 0.666° Data Directories Description
ctm/GEOS_0.5x0.666_CH.d/GEOS_5/YYYY/MM GEOS-5 met field files for 0.5° x 666° CH nested grid simulations
ctm/GEOS_0.5x0.666_EU.d/GEOS_5/YYYY/MM GEOS-5 met field files for 0.5° x 666° EU nested grid simulations
ctm/GEOS_0.5x0.666_NA.d/GEOS_5/YYYY/MM GEOS-5 met field files for 0.5° x 666° NA nested grid simulations
0.5° x 0.625° Data Directories Description
ctm/GEOS_5x0.625_AS.d/MERRA2/YYYY/MM MERRA-2 met fields for 0.5° x 0.625° AS nested grid simulations
ctm/GEOS_5x0.625_EU.d/MERRA2/YYYY/MM MERRA-2 met fields for 0.5° x 0.625° EU nested grid simulations
ctm/GEOS_5x0.625_NA.d/MERRA2/YYYY/MM MERRA-2 met fields for 0.5° x 0.625° NA nested grid simulations
2° x 2.5° Data Directories Description
ctm/GEOS_2x2.5.d/GEOS_4_v4/YYYY/MM/ GEOS-4 met fields for 2° x 2.5° global simulations
ctm/GEOS_2x2.5.d/GEOS_5/YYYY/MM GEOS-5 met fields for 2° x 2.5° global simulations
ctm/GEOS_2x2.5.d/GEOS_FP/YYYY/MM GEOS-FP met fields for 2° x 2.5° global simulations
ctm/GEOS_2x2.5.d/MERRA/YYYY/MM MERRA met fields for 2° x 2.5° global simulations
ctm/GEOS_2x2.5.d/MERRA2/YYYY/MM MERRA-2 met fields for 2° x 2.5° global simulations
4° x 5° Data Directories Description
ctm/GEOS_4x5.d/GEOS_4_v4/YYYY/MM GEOS-4 met fields for 4° x 5° global simulations
ctm/GEOS_4x5.d/GEOS_5/YYYY/MM GEOS-5 met fields for 4° x 5° global simulations
ctm/GEOS_4x5.d/GEOS_FP/YYYY/MM GEOS-FP met fields for 4° x 5° global simulations
ctm/GEOS_4x5.d/MERRA/YYYY/MM MERRA met fields for 4° x 5° global simulations
ctm/GEOS_4x5.d/MERRA2/YYYY/MM MERRA-2 met fields for 4° x 5° global simulations

A catalog of available data may be found HERE.

--Melissa Sulprizio (talk) 14:22, 24 March 2017 (UTC)

Compute Canada data directory archive

The 0.5° x 0.625° global MERRA-2 data are available from:

http://geoschemdata.computecanada.ca

We recommend that you use the wget utility to download these directories. Wget allows you to download multiple directories at once. The Wget command will take the form:

wget -r -nH --cut-dirs=2 "http://geoschemdata.computecanada.ca/DIRECTORY_NAME"

See the table below for the DIRECTORY_NAME options.

Compute Canada directory structure

If you are downloading the MERRA-2 met data, then please note the following:

  1. You will need to download the "CN" (constant) data files for each horizontal grid that you are using. These are timestamped for 2015/01/01 and are found in these data directories of http://geoschemdata.computecanada.ca:
    • GEOS_0.5x0.625/MERRA2/MERRA2_05x0625_201501.tar
Directory Description
GEOS_0.5x0.625/MERRA2/YYYY/MM MERRA-2 met fields for 0.5° 0.625° global simulations

--Melissa Sulprizio (talk) 14:22, 24 March 2017 (UTC)

Using wget to download the shared data directories

A simple way to download the GEOS-Chem emissions and met field data is to use the Unix wget utility. This allows you to download multiple files and directories at a time.

The wget utility is free and open-source (published by GNU), and comes standard with pretty much all builds of *nix (Linux, Ubuntu, Fedora, Centos, etc.). You can check out the user manual for more information.

NOTE: wget will not retrieve symbolically linked directories. To download directories that are symbolically linked, use wget with the paths that the symbolically linked directories point to. This may be necessary when setting up the ExtData directory if you are downloading data for the first time. See the Setting up the ExtData directory wiki page for more information.

Syntax

Most of the time, the syntax you will use to download multiple directories is as follows:

Downloading data from Harvard:

wget -r -nH "ftp://ftp.as.harvard.edu/DIRECTORY_NAME/"

Downloading data from Dalhousie:

wget -r -nH "ftp://rain.ucis.dal.ca/DIRECTORY_NAME/"

The options to wget are as follows:

-r   Specifies recursive directory transfer (i.e. will download all subdirectories)
-nH  Will store all directories and subdirectories in DIRECTORY_NAME, not ftp.as.harvard.edu/DIRECTORY_NAME

If you wish to trim the name of the downloaded directory (i.e., so it downloads as DIRECTORY_NAME, not pub/geos-chem/data/DIRECTORY_NAME), then use the --cut-dirs option:

wget -r -nH --cut-dirs=X "ftp://ftp.as.harvard.edu/DIRECTORY_NAME/"

where X is the number of directories to trim.

NOTE: The URL must be enclosed in quotes for file transfer to occur. If you omit the quotes then wget will just return a directory listing in a file named index.html without any files being downloaded.

Examples

1. Download all available GEOS-Chem 2° x 2.5° met field data files in the GEOS_2x2.5.d directory structure:

wget -r -nH "ftp://ftp.as.harvard.edu/gcgrid/geos-chem/data/GEOS_2x2.5.d/" &

Due to the huge volume of data involved, this is not recommended, as the file downloads may swamp your system. It's better to do download the data smaller chunks. For example:

2. Download all GEOS-5 met data at 2° x 2.5° resolution:

wget -r -nH "ftp://ftp.as.harvard.edu/gcgrid/geos-chem/data/GEOS_2x2.5.d/GEOS_5/" &

It may even be better to download one year at a time.:

3. Download all GEOS-5 met data at 2° x 2.5° resolution for 2008:

wget -r -nH "ftp://ftp.as.harvard.edu/gcgrid/geos-chem/data/GEOS_2x2.5.d/GEOS_5/2008/" &

--Melissa Sulprizio 16:57, 8 April 2015 (EDT)

Obtain only updated files

Prasad Kasibhatla wrote:

Maybe this is common knowledge, but I just discovered that using the -N option in wget ensures that only files with newer timestamps than what resides on my local machines are downloaded - found this very useful to update my shared data directories.

--Melissa Payer 10:39, 1 June 2012 (EDT)

Downloading the shared data directories via anonymous FTP

You can also download the shared data directories via anonymous FTP:

ftp ftp.as.harvard.edu
cd gcgrid/geos-chem/data/ExtData/GCAP_4x5
cd gcgrid/geos-chem/data/ExtData/GEOS_0.25x0.3125_CH
cd gcgrid/geos-chem/data/ExtData/GEOS_0.25x0.3125_NA
cd gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.666_CH
cd gcgrid/geos-chem/data/ExtData/GEOS_0.5x0.666_NA
cd gcgrid/geos-chem/data/ExtData/GEOS_2x2.5
cd gcgrid/geos-chem/data/ExtData/GEOS_4x5
cd gcgrid/geos-chem/data/ExtData/GEOS_MEAN
cd gcgrid/geos-chem/data/ExtData/GEOS_NATIVE
cd gcgrid/geos-chem/data/ExtData/HEMCO
cd gcgrid/geos-chem/data/ExtData/CHEM_INPUTS

--Melissa Sulprizio 16:52, 8 April 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. For complete instructions, please see our HEMCO data directories wiki page

--Melissa Sulprizio 16:52, 8 April 2015 (EDT)

For more information

For GCAP users

For those users who wish to run GEOS-Chem with the GISS/GCAP met fields, please contact Loretta Mickley.

--Bob Y. 09:52, 8 March 2010 (EST)

Question about directory structure

Shanna Shaked wrote:

We are working again on trying to run GEOS-Chem. However, we are encountering some errors that may be due to the directory structure. We find a discrepancy between the directory structure described in the GEOS-Chem manual and that available on the ftp site.
The GEOS-Chem manual describes a directory structure of:
   data/GEOS_4x5/GEOS_5/YYYY/MM
However, on the ftp site, we find a directory structure with an extra '.d':
   data/GEOS_4x5.d/GEOS_5/YYYY/MM
(the GEOS_5 folder is in GEOS_4x5.d rather than GEOS_4x5). There does exist a GEOS_4x5 that contains many of the emissions data, but does not contain GEOS_5.
If we leave the structure as is, and enter ../data/GEOS_4x5/ as our root data directory in input.geos, we get a file not found error when it looks for GEOS_5 within this directory (obviously).
If we instead enter ../data/GEOS_4x5.d as our root data directory, we get a file not found error when the program looks for emissions within this directory (lightning NOx emissions, in this case).
QUESTION: To solve this problem, we have moved the GEOS_5 folder into the GEOS_4x5 directory. [Is this] okay?

Bob Yantosca replied:

The only difference on our system between e.g. GEOS_4x5 and GEOS_4x5.d is that our sysadmin (Jack Yatteau) set up the ".d" directories separately so that they only contain met data (which is much larger than the emissions etc. data). That way he could separate the disks that just had met data from the disk that have the emissions data to facilitate our configuration here. There are symbolic links from GEOS_4x5 to GEOS_4x5.d etc. (i.e. the directory GEOS_4x5/GEOS_5 is actually a symbolic link to the corresponding directory in GEOS_4x5.d/GEOS_5/ and etc. for the other met field resolutions & directories).
You don't necessarily have to do this on your end, but this is what we did here. You can just make the GEOS_4x5/GEOS_5 etc. real subdirectories and not symbolic links and store the data there. The solution you picked above is OK.
Also to facilitate FTP file transfer, you could do the following:
  • Write a script or an FTP macro
  • Use a 3rd-party GUI program like FireFTP in Mozilla Firefox.
  • Or even better yet, use the Unix wget utility (see below)
Each user is responsible for their own file transfers.

--Bob Y. 11:04, 5 February 2009 (EST)

Previous issues that are now resolved

Inconsistency in GEOS-FP files at Harvard and Dalhousie for July 2013

NOTE: This inconsistency will be fixed in September 2017, and will be validated with benchmark simulations for v11-02d. The solution will be to recopy the files from the Dalhousie archive to the Harvard archive.

As always, we recommend downloading all met fields from the Dalhousie shared data directory archive to avoid issues like this in the future.

Prasad Kasibhatla wrote:

I wanted to alert you about something you might know already. I have been trying to run Tomas Sherwen's halogen chem code here and was seeing some substantial differences in my output files compared to his, and I finally traced them to differences in *cld* met files between the Harvard (where I got my met files) and Dalhousie (where he got his met files) archives.
I have only looked at the GEOS_FP 4x5 2013 July *cld* files - I don't know if this is a more widespread issue affecting other met files/met products/years/resolutions. But thought I should alert you.

Chi Li wrote:

I have retrieved the original GMAO GEOS-FP data for July, 2013, and generated the 4x5 A3cld data. I double checked the code and recompiled it, to guarantee that the new way of calculating CLOUD is included in the new processing.
I read in “CLOUD”, “OPTDEPTH” variables and compared the values. The differences were 0 everywhere and every time step when compared with the Dalhousie data for every day. Meanwhile when compared with the Harvard data, the maximum differences in OPTDEPTH could reach ~15 for July 5-31.
I did not compress these data to nc4 but they readily agree with the Dalhousie data. So from my view I would say the Dalhousie archive should represent the more recent updates, at least for this month.
I am not sure how to look more into the difference between Harvard and Dal data. It is strange that the Harvard data agree exactly with Dal and newly processed data on every level and every time step for July 1-4. Anyway, if you recall something else to check with, I am willing to help.

Bob Yantosca wrote:

Odd – it seems like on our end, July 1-4 files were created after the commit that was made to use CLOUD (on 2013-12-12) but July 5-31 were made before (on 2013-11-23 or thereabouts). I am not sure what happened. Now I’m thinking that the Harvard files for this month might not be correct.
One thing – since we use July 2013 as our benchmarking year, this will affect the GC benchmarks, if we change the met fields.

--Melissa Sulprizio (talk) 20:13, 15 August 2017 (UTC)