GEOS-5

NASA/GMAO ceased production of GEOS-5.2.0 data as of June 2013. See GMAO's GEOS Near-Real Time Data Products page for more details. We recommend that you use either GEOS-FP, which is the current operational GMAO met data product, or MERRA-2, which is the current GMAO reanalysis product. GEOS-5 was de-supported in GEOS-Chem v11-02.

Please visit the links below to learn more about the GEOS-5 met field products produced by NASA/GMAO.

Overview

GEOS-5 is our GEOS-Chem met field archive of the GMAO GEOS-5.1.0 and GEOS-5.2.0 data products. Both of these were former NASA/GMAO operational data products. Data is available for years 2004 through 2012, with partial coverage for 2013. These data have a native resolution of 0.5° lat x 0.666° lon x 72 hybrid levels. We have archived these data to the GEOS-Chem global and nested horizontal grids.

The table below lists the GMAO version numbers corresponding to specific dates in our GEOS-5 archive.

GMAO version number	Start date (in GEOS-5 archive)	End date (in GEOS-5 archive)
GEOS-5.1.0	01 Dec 2003	31 Aug 2008
GEOS-5.2.0	01 Sep 2008	31 May 2013

--Bob Y. (talk) 21:26, 14 July 2015 (UTC)

Additional documentation

For more information, please see:

• Overview of GMAO met data products used by GEOS-Chem
• Version history of GMAO met data products
• GEOS-5 File Specification Document (version 5.2.0)
• List of GEOS-5 met fields used by GEOS-Chem
• GEOS-5 issues
• Availability of GEOS-5 data
• GEOS-5 met field reprocessing (NOTE: This was completed in 2009.)
• GEOS-5 products page at GMAO
• GEOS-5 data averaging intervals

--Bob Y. (talk) 21:24, 14 July 2015 (UTC)

MERRA

NASA/GMAO ceased production of MERRA data as of June 2013. See GMAO's GEOS Near-Real Time Data Products page for more details. We recommend that you use MERRA-2, which is the current GMAO reanalysis product. MERRA was de-supported in GEOS-Chem v11-02.

The GMAO MERRA data product is a 30-year reanalysis done with the GEOS Data Assimilation System (GEOS-DAS) version GEOS-5.2.0. We have archived this data to the GEOS-Chem 2° x 2.5° and 4° x 4.5° grids. For more information about the MERRA reanalysis product, please see:

1. MERRA File Specification Document (03 Aug 2012)
2. MERRA page on the GEOS-Chem wiki
3. List of MERRA met fields used by GEOS-Chem
4. MERRA grid structure
5. MERRA file naming convention
6. MERRA data file collections (aka file types)
7. MERRA time archiving
8. MERRA mainstream and spinup data
9. MERRA data holdings at GSFC
10. Glossary of variables produced by the GEOS-DAS
11. Overview of GMAO met data products
12. [ersion history of GMAO met data products

--Bob Y. (talk) 21:19, 14 July 2015 (UTC)

GEOS-FP data product

NASA/GMAO has made a major upgrade to its near real time (NRT) GEOS-5 data production system. Designated as GMAO-FP (which we refer to as GEOS-FP), the new system includes many scientific improvements to the dynamics, physics, and the analysis. These improvements improve the quality the GEOS assimilated meterological data. Additionally, a few major engineering changes are also present in the new system, including:

1. the horizontal spatial resolution is increased to 1/4° lat x 5/16° lon
2. file format is changed from the current HDF-4 to netCDF-4/HDF-5
3. temporal frequency of 3-D products is changed from 6 hr to 3 hr
4. temporal frequency of most 2-D products is changed from 3 hr to 1 hr
5. new variables are added such as ocean and aerosols fields
6. The groupings of variables in the GEOS-FP file collections are considerably different from those of the previous operational data product (GEOS-5.2.0).

For more information, please see the following:

• GEOS5-FP file specification document, Version 1.2 (04 Aug 2011)
• GEOS-FP page on the GEOS-Chem wiki
• List of GEOS-FP met fields
• Overview of GMAO met data products used by GEOS-Chem
• Version history of GMAO met data products

--Bob Y. (talk) 21:16, 14 July 2015 (UTC)

Acknowledge the source of GEOS-5 data in your publications

If your GEOS-Chem research depends on either the GEOS-5.2.0, MERRA, GEOS-FP, or MERRA-2 meteorological data products, please consider adding an acknowledgment to your citations, such as:

The GEOS-5.2.0 / MERRA / GEOS-FP / MERRA-2 data used in this study/project have been provided by the Global Modeling and Assimilation Office (GMAO) at NASA Goddard Space Flight Center.

--Bob Yantosca (talk) 16:51, 2 June 2017 (UTC)