Difference between revisions of "Overview of GMAO met data products"
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{| border=1 cellspacing=0 cellpadding=5 | {| border=1 cellspacing=0 cellpadding=5 | ||
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|-valign="top" | |-valign="top" | ||
− | | | + | !width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name: |
+ | |width="700px"|[[GEOS-4]] | ||
+ | |-valign="top" | ||
+ | !bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files: | ||
|NCAR fvCCM GCM | |NCAR fvCCM GCM | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Native horizontal grid: |
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#GMAO_1x125 1° x 1.25°] | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#GMAO_1x125 1° x 1.25°] | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Native vertical grid: |
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#GEOS-4_native 55 hybrid levels]; model top at 0.01 hPa | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#GEOS-4_native 55 hybrid levels]; model top at 0.01 hPa | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Native file format: |
|HDF4-EOS | |HDF4-EOS | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Temporal coverage: |
|1985-2006; some 2007 | |1985-2006; some 2007 | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|We regridded to: |
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#GMAO_4x5 4° x 5°] at 55 sigma layers | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#GMAO_4x5 4° x 5°] at 55 sigma layers | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Strengths: |
| | | | ||
*Long temporal horizon – 20 years of consistent met data | *Long temporal horizon – 20 years of consistent met data | ||
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*Much better STE than any prior GEOS met fields | *Much better STE than any prior GEOS met fields | ||
|-valign="top" | |-valign="top" | ||
− | | | + | !bgcolor="#CCCCCC"|Weaknesses: |
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*Convection variables totally different than GEOS–3 | *Convection variables totally different than GEOS–3 |
Revision as of 20:30, 14 July 2015
On this page we shall list the features of the various meteorological data products produced by NASA's Global Modeling and Assimilation Office. These products are used to drive GEOS-Chem.
Contents
GMAO met field comparison chart
NASA/GMAO ceased production of GEOS-5.2.0 as of June 2013. Therefore, you will not be able to use GEOS-5.2.0 to run GEOS-Chem global or nested grid simulations for model dates after June 2013. But you can still run GEOS-Chem simulations using our archive of GEOS-5 meteorology.
The MERRA reanalysis product was scheduled for decommissioning in 2015. It will be replaced by MERRA-2 (aka GEOS-5.13.0).
The current operational GMAO met data product is now what we call GEOS-FP, which corresponds to GEOS-5.7.2 and later versions). We are processing GEOS-FP data for 2012 up to present day. You will be able to use GEOS-FP for both global and hi-res (0.25° x 0.3125°) nested-grid simulations in GEOS-Chem v9-02 and later GEOS-Chem versions.
— Bob Yantosca, 14 Jul 2015
The following table is a quick summary of the GMAO meteorological data products that have been used to drive GEOS-Chem simulations. For a more detailed listing of the GMAO operational data products by GMAO version number, please see our Version history of GMAO met data products wiki page.
GEOS-1 | GEOS-STRAT | GEOS-3 | GEOS-4 | GEOS-5 | MERRA | GEOS-FP (GEOS-5.7.2 and later) | |
---|---|---|---|---|---|---|---|
Native vertical grid | 20 sigma | 26 sigma | 48 sigma | 55 hybrid | 72 hybrid | 72 hybrid or 42 pressure |
72 hybrid |
Native horizontal grid | 2° x 2.5° | 2° x 2.5° | 1° x 1° | 1° x 1.25° | 0.5° x 0.666° | 0.5° x 0.666° 1.25° x 1.25° 1° x 1.25° |
0.25° x 0.3125° |
Native file format | Binary | Binary | HDF4-EOS | HDF4-EOS | HDF4-EOS | HDF4-EOS | netCDF4/HDF5 |
Regridded to | 2° x 2.5° 4 x 5 |
2° x 2.5° 4° x 5° |
1° x 1° nested 2 x 2.5° 4° x 5° |
2° x 2.5° 4° x 5° |
0.5° x 0.666° nested 2° x 2.5° 4° x 5° |
4° x 5° | 0.25° x 0.3125° nested 2° x 2.5° 4° x 5° |
Temporal coverage | 1985 - 1995 | 1996 - 1998 | 2000 - 2002 | 1985 - 2007 | 2004 - 2012 partial 2003 partial 2013 |
1979 - present; we have archived up to 2010 |
2012 - present |
Is this data still being produced? | NO | NO | NO | NO | NO | YES | YES |
Is this data still compatible with GEOS-Chem? | NO | NO | NO | YES | YES | YES | YES |
NOTES:
- This table only lists the met fields produced by NASA/GMAO. GEOS-Chem also can perform simulations for GCAP, with met fields archived from one or more different GISS-GCM model simulations. Please see our GCAP wiki page for more information.
- GEOS-1, GEOS-STRAT and GEOS-3 are now obsolete and are no longer supported for GEOS-Chem.
- MERRA is a long-term reanalysis done with version GEOS-5.2.0.
- The new GEOS-FP data product has now replaced the interim GEOS-5.7.2 product. This data product has an increased horizontal resolution (1/4° lat x 5/16° lon).
- Please also see our Notes regarding GEOS vertical grids wiki page for more information about how the sigma and hybrid grids are defined.
--Bob Y. (talk) 13:59, 14 July 2015 (UTC)
GEOS-FP
GEOS-FP is the GEOS-Chem data archive corresponding the GMAO-FP ("forward processing") met data product. This is the current operational GMAO data product that can be used to drive GEOS-Chem simulations.
Summary
GEOS-Chem met archive name: | GEOS-FP |
---|---|
GMAO data assimilation system that was used to create these data files: | GEOS Data Assimilation System (GEOS-DAS)
|
Native horizontal grid: | 0.25° (lat) x 0.3125° (lon) |
Native vertical grid: | 72 hybrid levels; model top at 0.01 hPa |
Native file format: | netCDF4 (based on HDF5) |
Temporal coverage: | 2011-present |
We regridded to: | |
Strengths: |
|
Weaknesses: |
|
NOTES:
- GEOS-FP was introduced in 2011 as GEOS-5.7.2, which was the version of the GEOS5-DAS used at the time. For more information on the differences between this product and the prior operational product (GEOS-5.2.0), please see: Evolution of the GEOS-5 system from GEOS-5.2.0/MERRA to GEOS-5.7.2 (aka "Fortuna").
- GMAO also produces a lower-resolution product called "GEOS5-FP-IT" ("forward processing, instrument teams"), which is available at 0.5° x 0.666°. However, this product is not a true operational system because it is "frozen". This means that new scientific updates are not introduced into GEOS5-FP-IT. For GEOS-Chem, we will only use the GEOS-FP product, not only because of its higher resolution, but also because we want to take advantage of any scientific updates that are made to the GEOS-DAS assimilation system.
- For GEOS-Chem, we only regrid to coarser horizontal resolution. We keep the MERRA vertical grid of 72 layers. GEOS-Chem has the capability to lump vertical vertical levels in the stratosphere to gain computational advantage.
- Please also see our Version history of GMAO met data products wiki page for more information about the individual data versions that are part of the GEOS-FP archive.
--Bob Y. (talk) 19:59, 14 July 2015 (UTC)
References
For more information about the GMAO "forward processing" data product, please see:
- GEOS5-FP file specification document, Version 1.0 (11 Jun 2013)
- GEOS-FP on the GEOS-Chem wiki
- List of GEOS-FP met fields used by GEOS-Chem
- GEOS-FP grid structure
- GEOS-FP file naming convention
- GEOS-FP data file collections (aka file types)
- GEOS-FP time archiving
- Glossary of variables produced by the GEOS-DAS
- Molod, A., L. Takacs, M. Suarez, J. Bacmeister, I. Song, and A. Eichmann, The GEOS-5 Atmospheric General Circulation Model: Mean Climate and Development from MERRA to Fortuna, Technical Report Series on Global Modeling and Data Assimilation, 28, Ed: Max J. Suarez, NASA GMAO, Goddard Space Flight Center, Greenbelt, MD, April 2012. (PDF)
--Bob Y. (talk) 19:54, 14 July 2015 (UTC)
MERRA reanalysis
The MERRA reanalysis product is still being produced.
— Bob Yantosca, 06 Aug 2014
MERRA is the GEOS-Chem data archive corresponding to the GMAO MERRA reanalysis data product.
Summary
GEOS-Chem met archive name: | MERRA |
---|---|
GMAO data assimilation system that was used to create these data files: | GEOS Data Assimilation System (GEOS-DAS)
|
Native horizontal grid: |
|
Native vertical grid: |
|
Native file format: | HDF4-EOS |
Temporal coverage: | 1979-May 2015
|
We regridded to: | |
Strengths: |
|
Weaknesses: |
|
NOTES:
- For GEOS-Chem, we only regrid to coarser horizontal reslution. We keep the MERRA vertical grid of 72 layers. GEOS-Chem has the capability to lump vertical vertical levels in the stratosphere to gain computational advantage.
- Some MERRA data files are only available on a fixed pressure grid with 42 layers. We have regridded those fields to 72 layers for use with GEOS-Chem.
- Please also see our Version history of GMAO met data products wiki page for more information about the individual data versions that are part of the MERRA archive.
--Bob Y. (talk) 20:10, 14 July 2015 (UTC)
References
For more information about the MERRA reanalysis product, please see:
- MERRA File Specification Document (03 Aug 2012)
- MERRA on the GEOS-Chem wiki
- List of MERRA met fields used by GEOS-Chem
- MERRA grid structure
- MERRA file naming convention
- MERRA data file collections (aka file types)
- MERRA time archiving
- MERRA mainstream and spinup data
- MERRA data holdings at GSFC
- Glossary of variables produced by the GEOS-DAS
--Bob Y. 11:48, 19 August 2013 (EDT)
GEOS-5
NASA/GMAO ceased production of GEOS-5.2.0 data as of June 2013. Therefore, you will not be able to use GEOS-5.2.0 met fields to run global or nested grid simulations for model dates after June 2013. But you can still run GEOS-Chem simulations using our archive of GEOS-5 meteorology for years 2004 through mid-2013.
The current operational GMAO met data product is now what we call GEOS-FP, which corresponds to GEOS-5.7.2 and later versions). We are processing GEOS-FP data for 2012 up to present day. You will be able to use GEOS-FP for both global and hi-res (0.25° x 0.3125°) nested-grid simulations in GEOS-Chem v9-02 and later GEOS-Chem versions.
— Bob Yantosca, 14 Jul 2015
GEOS-5 is the GEOS-Chem data archive corresponding to the GMAO GEOS-5.1.0 and GEOS-5.2.0 data products.
Summary
GEOS-Chem met archive name: | GEOS-5 |
---|---|
GMAO data assimilation system that was used to create these data files: | GEOS Data Assimilation System (GEOS-DAS)
|
Native horizontal grid: | |
Native vertical grid: | 72 hybrid levels; model top at 0.01 hPa |
Native file format: | HDF4-EOS |
Temporal coverage: |
|
We regridded to: |
|
Strengths: |
|
Weaknesses: |
NOTES:
- The GEOS-5 and MERRA data are kept at 72 vertical levels, and are only regridded to coarser horizontal resolution. However, GEOS-Chem has the capability to lump levels on the fly from 72 to 47 vertical levels. This is done for computational expediency.
- The new GEOS-5.7.2 data product was officially released in 2011. This data set has increased horizontal resolution (0.25° x 0.3125°), but the same # of vertical levels (72) as the older GEOS-5 and MERRA products.
- Please also see this document which details the evolution of the GEOS-5 system from GEOS-5.2.0/MERRA to GEOS-5.7.2 (aka "Fortuna").
- Please also see our Version history of GMAO met data products wiki page for more information about the individual data versions that are part of the GEOS-5 archive.
--Bob Y. (talk) 20:26, 14 July 2015 (UTC)
References
- List of GEOS-5 met fields used by GEOS-Chem
- GEOS-5 issues encountered w/r/t GEOS-Chem
- Reprocessing of GEOS-5 met data for GEOS-Chem (completed Jul 2009)
- GEOS-5 products page at GMAO
- GEOS-5 File Specification Document (version 5.2.0)
- Glossary of variables produced by the GEOS-DAS
--Bob Y. 12:04, 19 August 2013 (EDT)
GEOS-4
GMAO no longer produces GEOS-4 data. But you can still run GEOS-Chem simulations using our 20-year archive of GEOS-4 meteorology.
The current operational GMAO met data product is now what we call GEOS-FP, which corresponds to GEOS-5.7.2 and later versions). We are processing GEOS-FP data for 2012 up to present day. You will be able to use GEOS-FP for both global and hi-res (0.25° x 0.3125°) nested-grid simulations in GEOS-Chem v9-02 and later GEOS-Chem versions.
— Bob Yantosca, 14 Jul 2015
GEOS-4 was produced at higher vertical resolution but slightly coarser horizontal resolution than GEOS-3. There are approximately 20 years of GEOS-4 data available to be used with GEOS-Chem. GEOS-4 has been used extensively by the GEOS-Chem community in various applications.
Please see our GEOS-4 wiki page for more information.
Summary
GEOS-Chem met archive name: | GEOS-4 |
---|---|
GMAO data assimilation system that was used to create these data files: | NCAR fvCCM GCM |
Native horizontal grid: | 1° x 1.25° |
Native vertical grid: | 55 hybrid levels; model top at 0.01 hPa |
Native file format: | HDF4-EOS |
Temporal coverage: | 1985-2006; some 2007 |
We regridded to: | 4° x 5° at 55 sigma layers |
Strengths: |
|
Weaknesses: |
|
NOTES:
- The GEOS-4 data are kept at 55 vertical levels, and are only regridded to coarser horizontal resolution. However, GEOS-Chem has the capability to lump levels on the fly from 72 to 30 vertical levels. This is done for computational expediency.
References
- GEOS-4 on the GEOS-Chem wiki
- Documents which describe the validation of GEOS-4 met fields in GEOS-Chem
- GEOS-4 references
- List of GEOS-4 met fields
- Availability of GEOS-4 met fields
--Bob Y. 14:07, 19 August 2013 (EDT)
GEOS-3
GMAO no longer produces GEOS-3 data. GEOS-Chem v9-01-03 (released on 12 Sep 2014) and higher versions no longer support the GEOS-3 met data.
The current GMAO met data product is now the GEOS-FP operational product, which is supported in GEOS-Chem v9-02 and higher versions. We are processing GEOS-FP data for 2012 up to present day. You will be able to use GEOS-FP for both global and hi-res (0.25° x 0.3125°) nested-grid simulations starting with GEOS-Chem v9-02.
— Bob Yantosca, 28 May 2014
GEOS-3 was an improvement over GEOS-1 and GEOS-STRAT. However, because GEOS-3 was a pure-sigma model, there were problems in the stratosphere caused by excess noise in the winds. The GEOS-3 product was extensively used in GEOS-Chem for TRACE-P mission analysis.
Assimilation GCM used: | NASA/GSFC GEOS–3 GCM |
Native horizontal grid: | 1° x 1° |
Native vertical grid: | 48 sigma levels; model top at 0.01 hPa |
Native file format: | HDF4-EOS |
Temporal coverage: | 2000-2002 |
We regridded to: | 1° x 1° nested grids, 2° x 2.5°, 4° x 5° at 48 sigma layers |
Strengths: |
|
Weaknesses: |
|
NOTES:
- The GEOS-3 data are kept at 48 vertical levels, and are only regridded to coarser horizontal resolution. However, GEOS-Chem has the capability to lump levels on the fly from 48 to 30 vertical levels. This is done for computational expediency.
--Bob Y. 12:41, 29 July 2010 (EDT)
GEOS-1 and GEOS-STRAT
GMAO no longer produces GEOS-1 or GEOS-STRAT data. GEOS-1 and GEOS-STRAT are no longer supported in GEOS-Chem.
The current GMAO met data product is now the GEOS-FP operational product, which is supported in GEOS-Chem v9-02 and higher versions. We are processing GEOS-FP data for 2012 up to present day. You will be able to use GEOS-FP for both global and hi-res (0.25° x 0.3125°) nested-grid simulations starting with GEOS-Chem v9-02.
— Bob Yantosca, 28 May 2014
GEOS-1 was the first GMAO met field data product compatible with GEOS-Chem. GEOS-STRAT was a continuation of GEOS-1, but with a finer vertical grid. Both products have been superseded by newer versions of GMAO met products and are no longer supported in GEOS-Chem.
GEOS-1 features
Assimilation GCM used: | NASA/GSFC GEOS1 GCM |
Native horizontal grid: | 2° x 2.5° |
Native vertical grid: | 20 pure-sigma layers, model top at 10 hPa |
Native file format: | NASA PHOENIX format (binary Fortran unformatted) |
Temporal coverage: | 1985-1995 |
We regridded to: | 4 x 5; 20 pure-sigma layers |
Strengths: |
|
Weaknesses: |
|
GEOS-STRAT features
Assimilation GCM used: | NASA/GSFC GEOS1 GCM |
Native horizontal grid: | 2° x 2.5° |
Native vertical grid: | 46 pure-sigma layers, model top at 0.1 hPa |
Native file format: | NASA PHOENIX format (binary Fortran unformatted) |
Temporal coverage: | 1996-1997 (some 1998) |
We regridded to: | 4 x 5; 26 pure-sigma layers |
Strengths: |
|
Weaknesses: |
|
--Bob Y. 16:43, 27 July 2010 (EDT)