Difference between revisions of "Overview of GMAO met data products"

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On this page we shall list the features of the [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php various meteorological data products] produced by [http://gmao.gsfc.nasa.gov NASA's Global Modeling and Assimilation Office].  These products are used to drive GEOS-Chem.
 +
 
== GMAO met field comparison chart ==
 
== GMAO met field comparison chart ==
 +
 +
=== Important notice from NASA/GMAO ===
 +
 +
'''''Daniel Jacob wrote:'''''
 +
 +
<blockquote>
 +
Dear GEOS-Chem user:
 +
 +
I write address some confusion about the different GEOS meteorological datasets produced by NASA GMAO and used by GEOS-Chem.
 +
 +
The two main data archives that you should use for your GEOS-Chem simulations are:
 +
 +
#The operational data stream from the GEOS Forward Processing  (0.25&deg; x 0.3125&deg;, 72 levels) starting in 2012, which should be called [[GEOS-FP]];
 +
#The consistent [[MERRA-2]] reanalysis for 1979-present (0.5&deg; x 0.625&deg;, 72 levels).
 +
 +
GEOS-Chem also supports older GEOS data sets including [[GMAO_GEOS-4|GEOS-4]], [[GEOS-5]], and [[MERRA]].  These are of inferior quality and GMAO does not want us to use them. They can still be useful to characterize model transport errors or the effects of different met fields for the same year, but should not be used for any other applications.
 +
 +
For more information see the GEOS-Chem narrative description at http://geos-chem.org/geos_chem_narrative.html
 +
 +
Daniel Jacob<br>02 Jun 2017
 +
</blockquote>
 +
 +
=== Side-by-side comparison of GMAO met data products ===
 +
 +
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 details see GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS Near-Real Time Data Products] page.
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
 
|- bgcolor="#cccccc" align="center" valign="top"
 
|- bgcolor="#cccccc" align="center" valign="top"
−
!&nbsp;
+
!width="225px"|&nbsp;
−
!GEOS-1
+
![[#GEOS-1 and GEOS-STRAT|GEOS-1]]
−
!GEOS-STRAT
+
![[#GEOS-1 and GEOS-STRAT|GEOS-STRAT]]
−
!GEOS-3
+
![[#GEOS-3|GEOS-3]]
−
!GEOS-4
+
![[#GEOS-4|GEOS-4]]
−
!GEOS-5
+
![[#GEOS-5|GEOS-5]]
−
!MERRA
+
![[#MERRA reanalysis|MERRA]]
 +
![[#MERRA-2 reanalysis|MERRA-2]]
 +
![[#GEOS-FP|GEOS-FP]]
  
 
|- align="center" valign="top"
 
|- align="center" valign="top"
−
|Native # of levels
+
|Data product type
−
|20 sigma
+
|bgcolor="#FF5555"|Operational
−
|26 sigma
+
|bgcolor="#FF5555"|Operational
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#A3.3 48 sigma]
+
|bgcolor="#FF5555"|Operational
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#A3.4 55 hybrid]
+
|bgcolor="#FF5555"|Operational
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#A3.5 72 hybrid]
+
|bgcolor="#FF5555"|Operational
 +
|bgcolor="#FF5555"|Reanalysis
 +
|Reanalysis
 +
|Operational
 +
 
 +
|- align="center" valign="top"
 +
|Is this data still being produced?
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|YES
 +
|YES
 +
 
 +
|- align="center" valign="top"
 +
|Is this data still compatible with GEOS-Chem?
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555"|NO
 +
|bgcolor="#FF5555" colspan="3"|Support for these products was removed<br>from [[GEOS-Chem v11-02#v11-02d|GEOS-Chem v11-02d]] and later versions
 +
|YES
 +
|YES
 +
 
 +
|- align="center" valign="top"
 +
|Native vertical grid
 +
|bgcolor="#FF5555"|20 sigma
 +
|bgcolor="#FF5555"|26 sigma
 +
|bgcolor="#FF5555"|48 sigma
 +
|bgcolor="#FF5555"|[[GEOS-Chem_vertical_grids#55-layer_vertical_grid|55 hybrid]]
 +
|bgcolor="#FF5555"|[[GEOS-Chem_vertical_grids#72-layer_vertical_grid|72 hybrid]]
 +
|bgcolor="#FF5555"|72 hybrid or<br>42 pressure
 +
|72 hybrid
 
|72 hybrid
 
|72 hybrid
  
 
|- align="center" valign="top"
 
|- align="center" valign="top"
−
|Native grid
+
|Native horizontal grid
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2&deg; x 2.5&deg;]
+
|bgcolor="#FF5555"|[[GEOS-Chem horizontal grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]]
−
|2 x 2.5
+
|bgcolor="#FF5555"|2&deg; x 2.5&deg;
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.5 1&deg; x 1&deg;]
+
|bgcolor="#FF5555"|[[GEOS-Chem horizontal grids#GMAO 1 x 1 grid|1&deg; x 1&deg;]]
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.4 1&deg; x 1.25&deg;]
+
|bgcolor="#FF5555"|[[GEOS-Chem horizontal grids#GMAO_1 x 1.25 grid|1&deg; x 1.25&deg;]]
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.6 0.5&deg; x 0.666&deg;]
+
|bgcolor="#FF5555"|[[GEOS-Chem horizontal grids#GMAO 0.5 x_0.666_grid|0.5&deg; x 0.666&deg;]]
−
|0.5 x 0.666 and<br>1 x 1.25
+
|bgcolor="#FF5555"|0.5&deg; x 0.666&deg;<br>1.25&deg; x 1.25&deg;<br>1&deg; x 1.25&deg;
 +
|[[GEOS-Chem horizontal grids#GMAO 0.5 x 0.625_grid|0.5&deg; x 0.625&deg;]]
 +
|[[GEOS-Chem horizontal grids#GMAO 0.25 x 0.3125_grid|0.25&deg; x 0.3125&deg;]]
  
 
|- align="center" valign="top"
 
|- align="center" valign="top"
 
|Native file format
 
|Native file format
−
|Binary
+
|bgcolor="#FF5555"|Binary
−
|Binary
+
|bgcolor="#FF5555"|Binary
−
|HDF4-EOS
+
|bgcolor="#FF5555"|HDF4-EOS
−
|HDF4-EOS
+
|bgcolor="#FF5555"|HDF4-EOS
−
|HDF4-EOS
+
|bgcolor="#FF5555"|HDF4-EOS
−
|HDF4-EOS
+
|bgcolor="#FF5555"|HDF4-EOS
 +
|netCDF4
 +
|netCDF4
  
 
|- align="center" valign="top"
 
|- align="center" valign="top"
 
|Regridded to
 
|Regridded to
−
|2&deg; x 2.5&deg;<br>[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4 x 5]
+
|bgcolor="#FF5555"|2&deg; x 2.5&deg;<br>[[GEOS-Chem horizontal grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]]
−
|2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
+
|bgcolor="#FF5555"|2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
−
|1&deg; x 1&deg; nested<br>&deg;2 x 2.5&deg;<br>4&deg; x 5&degl
+
|bgcolor="#FF5555"|1&deg; x 1&deg; nested<br>2 x 2.5&deg;<br>4&deg; x 5&deg;
−
|2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
+
|bgcolor="#FF5555"|2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
−
|0.5&deg; x 0.666&deg; nested<br>2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
+
|bgcolor="#FF5555"|0.5&deg; x 0.666&deg; nested<br>2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
−
|4 x 5
+
|bgcolor="#FF5555"|4&deg; x 5&deg;
 +
|0.5&deg; x 0.625&deg; global<br>0.5&deg; x 0.625&deg; nested<br>2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
 +
|0.25&deg; x 0.3125&deg; nested<br>2&deg; x 2.5&deg;<br>4&deg; x 5&deg;
  
 
|- align="center" valign="top"
 
|- align="center" valign="top"
 
|Temporal coverage
 
|Temporal coverage
−
|1985 - 1995
+
|bgcolor="#FF5555"|1985 - 1995
−
|1996 - 1998
+
|bgcolor="#FF5555"|1996 - 1998
−
|2000 - 2002
+
|bgcolor="#FF5555"|2000 - 2002
−
|1985 - 2007
+
|bgcolor="#FF5555"|1985 - 2007
−
|2004 - present
+
|bgcolor="#FF5555"|2004 - 2012<br>partial 2003<br>partial 2013
−
|1979 - 2010
+
|bgcolor="#FF5555"|1979 - present;<br>we have archived<br>up to 2010
 +
|1979 - present
 +
|2012 - present
 +
 
 +
|- align="center" valign="top"
 +
|
 +
|bgcolor="#FF5555" colspan=6|'''''WE RECOMMEND NOT TO USE THESE OBSOLETE MET FIELD DATA PRODUCTS<br>[[#Important notice from NASA/GMAO|See this notice from the preceding section]]'''''
 +
|colspan="2"|
  
 
|}
 
|}
  
 
NOTES:
 
NOTES:
−
# GEOS-1 and GEOS-STRAT are now obsolete and no longer supported by GEOS-Chem
+
# This table only lists the met fields produced by [http://gmao.gsfc.nasa.gov 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 [[GCAP|our ''GCAP wiki page'']] for more information.
−
# GEOS-3 is still supported but we recommend users to migrate to GEOS-4 or GEOS-5.
+
# GEOS-1, GEOS-STRAT and GEOS-3 are now obsolete and are no longer supported for GEOS-Chem.
−
# MERRA data will be made available at 4 x 5 resolution in the near future.  MERRA is a long-term reanalysis done with version GEOS-5.2.0.
+
# MERRA is a long-term reanalysis done with version GEOS-5.2.0.  It is no longer being produced.
−
   
+
# MERRA-2 is a long-term reanalysis done with version GEOS-5.12.4.
−
--[[User:Bmy|Bob Y.]] 16:24, 27 July 2010 (EDT)
+
# The new [[GEOS-FP|GEOS-FP data product]] has now replaced the interim GEOS-5.7.2 product.  This data product has an increased horizontal resolution (1/4&deg; lat x 5/16&deg; lon).
 +
# Please also see our [[GEOS-Chem vertical grids]] wiki page for more information about how the sigma and hybrid grids are defined.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:18, 2 June 2017 (UTC)
 +
 
 +
== GEOS-FP ==
 +
 
 +
'''[[GEOS-FP]]''' is the GEOS-Chem data archive corresponding the GMAO GEOS "forward processing" met data product.  This is the current operational GMAO data product that can be used to drive GEOS-Chem simulations.
 +
 
 +
=== Summary ===
 +
 
 +
{| border=1 cellspacing=0 cellpadding=5
 +
 
 +
|-valign="top"
 +
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|[[GEOS-FP]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 +
|GEOS Data Assimilation System (GEOS-DAS)
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.7.2]: 01 Apr 2012 to 10 Jun 2013
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.11.0]: 11 Jun 2013 to 20 Aug 2014
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.13.0]: 20 Aug 2014 to 01 May 2015
 +
*See https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php for rest
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native horizontal grid:
 +
|[[GEOS-Chem_horizontal_grids#GMAO_0.25_x_0.3125_grid|0.25&deg; (lat) x 0.3125&deg; (lon)]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native vertical grid:
 +
|[[GEOS-Chem_vertical_grids#72-layer_vertical_grid|72 hybrid levels]]; model top at 0.01 hPa
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native file format:
 +
|netCDF4 (based on HDF5)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Temporal coverage:
 +
|April 2012-present
 +
(Note constant fields are stored with date 2011/01/01)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|We regridded to:
 +
|
 +
*0.25&deg; x 0.3125&deg; [[GEOS-Chem_horizontal_grids#0.25_x_0.3125_CH_nested_grid|China]], [[GEOS-Chem_horizontal_grids#0.25_x_0.3125_EU_nested_grid|Europe]], [[GEOS-Chem_horizontal_grids#0.25_x_0.3125_NA_nested_grid|North America]] nested grids with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]] with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 72 hybrid layers
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Strengths:
 +
|
 +
*Ultra-high resolution will facilitate comparison to satellites
 +
*Detailed nested-grid simulations with GEOS-Chem are possible at 0.25&deg; x 0.3125&deg; resolution
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Weaknesses:
 +
|
 +
*Large data volume: 1 day of GEOS-FP “raw” data files  for GEOS-Chem > 21 GB!
 +
|}
 +
 
 +
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 ([https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.2.0]), please see: [http://gmao.gsfc.nasa.gov/pubs/docs/tm28.pdf 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&deg; x 0.666&deg;.  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 [[GEOS-Chem_vertical_grids#47-layer_reduced_vertical_grid|lump vertical vertical levels in the stratosphere] to gain computational advantage.
 +
# Please also see GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS Near-Real Time Data Products] page for more information about the GMAO data versions that are contained in our [[GEOS-FP]] archive.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:03, 12 February 2018 (UTC)
 +
 
 +
=== References ===
 +
 
 +
For more information about the GMAO "forward processing" data product, please see:
 +
 
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS_5_FP_File_Specification_ON4v1_0.pdf GEOS-FP file specification document, Version 1.0 (11 Jun 2013)]
 +
#[[GEOS-FP|GEOS-FP on the GEOS-Chem wiki]]
 +
#[[List of GEOS-FP met fields|List of GEOS-FP met fields used by GEOS-Chem]]
 +
#[[GEOS-FP#GEOS-FP grid structure|GEOS-FP grid structure]]
 +
#[[GEOS-FP#GEOS-FP file naming convention|GEOS-FP file naming convention]]
 +
#[[GEOS-FP#GEOS-FP data file collections|GEOS-FP data file collections (aka file types)]]
 +
#[[GEOS-FP#GEOS-FP time archiving|GEOS-FP time archiving]]
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS5_Glossary_11_01_2011.pdf 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'', <u>Technical Report Series on Global Modeling and Data Assimilation</u>, '''28''', Ed: Max J. Suarez, NASA GMAO, Goddard Space Flight Center, Greenbelt, MD, April 2012. [http://gmao.gsfc.nasa.gov/pubs/docs/tm28.pdf (PDF)]
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 19:22, 23 November 2016 (UTC)
 +
 
 +
== MERRA-2 reanalysis ==
 +
 
 +
[[MERRA-2]] is the GEOS-Chem data archive corresponding to the GMAO MERRA-2 reanalysis met data product.  This is the current GMAO reanalysis data set.  It contains more than 30 years of assimilated data that can be used to drive GEOS-Chem simulations.
 +
 
 +
=== Summary ===
 +
 
 +
{| border=1 cellspacing=0 cellpadding=5
 +
 
 +
|-valign="top"
 +
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|[[MERRA-2]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 +
|GEOS Data Assimilation System (GEOS-DAS)
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.12.4]: 1980's through 2010's
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native horizontal grid:
 +
|[[GEOS-Chem_horizontal_grids#GMAO_0.5_x_0.625_grid|0.5&deg; (lat) x 0.625&deg; (lon)]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native vertical grid:
 +
|[[GEOS-Chem_vertical_grids#72-layer_vertical_grid|72 hybrid levels]]; model top at 0.01 hPa
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native file format:
 +
|netCDF4 (based on HDF5)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Temporal coverage:
 +
|1980's thru 2010's
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|We are regridding to:
 +
|
 +
*0.5&deg; x 0.625&deg; global resolution grid with 72 hybrid layers
 +
*0.5&deg; x 0.625&deg; [[GEOS-Chem_horizontal_grids#0.5_x_0.625_AS_nested_grid|Asia (i.e. China + India)]], [[GEOS-Chem_horizontal_grids#0.5_x_0.625_EU_nested_grid|Europe]], and [[GEOS-Chem_horizontal_grids#0.5_x_0.625_NA_nested_grid|North America]] nested grids, with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]] with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 72 hybrid layers
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Strengths:
 +
|
 +
*Ultra-high resolution will facilitate comparison to satellites
 +
*Detailed nested-grid simulations with GEOS-Chem are possible at 0.25&deg; x 0.3125&deg; resolution
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Weaknesses:
 +
|
 +
*Large data volume
 +
|}
 +
 
 +
NOTES:
 +
# Please also see GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS Near-Real Time Data Products] page for more information about the GMAO data versions that are contained in our [[GEOS-FP]] archive.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 20:18, 23 November 2016 (UTC)
 +
 
 +
=== References ===
 +
 
 +
For more information about the MERRA-2 reanalysis data product, please see:
 +
 
 +
#[[MERRA-2|MERRA-2 on the GEOS-Chem wiki]]
 +
#[[List of MERRA-2 met fields|List of MERRA-2 met fields used by GEOS-Chem]]
 +
#[[MERRA-2#MERRA-2 grid structure|MERRA-2 grid structure]]
 +
#[[MERRA-2#MERRA-2 file naming convention|MERRA-2 file naming convention]]
 +
#[[MERRA-2#MERRA-2 data file collections|MERRA-2 data file collections (aka file types)]]
 +
#[[MERRA-2#MERRA-2 time archiving|MERRA-2 time archiving]]
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS5_Glossary_11_01_2011.pdf Glossary of variables produced by the GEOS-DAS]
 +
#[https://gmao.gsfc.nasa.gov/GMAO_products/reanalysis_products.php GMAO reanalysis products]
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 21:00, 9 February 2016 (UTC)
 +
 
 +
== MERRA reanalysis==
 +
 
 +
<span style="color:red">'''''The [[MERRA]] reanalysis product ceased in early 2016 and is now obsolete.  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.  MERRA will be de-supported in [[GEOS-Chem v11-02]].'''''</span>
 +
 
 +
<span style="color:red">'''''Support for MERRA meteorology was removed from [[GEOS-Chem v11-02#v11-02d|v11-02d]] and later versions. MERRA data will continue to be hosted on the [[Downloading_GEOS-Chem_source_code_and_data#Dalhousie_data_directory_archive|Dalhousie shared data archive]] for the foreseeable future.'''''</span>
 +
 
 +
=== Summary ===
 +
 
 +
{| border=1 cellspacing=0 cellpadding=5
 +
 
 +
|-valign="top"
 +
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|[[MERRA]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 +
|GEOS Data Assimilation System (GEOS-DAS)
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.3.0], used to create 3 separate data streams:
 +
**MERRA100: 01 Jan 1979 - 31 Dec 1992
 +
**MERRA200: 01 Jan 1993 - 31 Dec 2000
 +
**MERRA300: 01 Jan 2001 - present (scheduled to be turned off in 2015)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native horizontal grid:
 +
|
 +
*[[GEOS-Chem_horizontal_grids#GMAO_0.5_x_0.666_grid|0.5&deg; lat x 0.666&deg; lon]] (surface fields)
 +
*[[GEOS-Chem_horizontal_grids#GMAO_1_x_1.25_grid|1&deg; lat x 1.25&deg; lon]] (most 3-D fields)
 +
*1.25&deg; lat x 1.25&deg; (certain 3-D fields, such as moist quantities)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native vertical grid:
 +
|
 +
*1 layer (surface fields)
 +
*[[GEOS-Chem_vertical_grids#72-layer_vertical_grid|72 hybrid levels]]; model top at 0.01 hPa
 +
*42 pressure levels (certain 3-D fields, such as moist quantities)
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native file format:
 +
|HDF4-EOS
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Temporal coverage:
 +
|1979-May 2015
 +
*NOTE: the GEOS-Chem data archive only includes data to the end of 2013.
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|We regridded to:
 +
|
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5_grid|2&deg; x 2.5&deg;]] with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 72 hybrid layers
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Strengths:
 +
|
 +
*High resolution will facilitate comparison to satellites
 +
*Convection, optical depth better than in GEOS–4
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Weaknesses:
 +
|
 +
*Large data volume: 1 day of MERRA “raw” data files > 2 GB!
 +
 
 +
|}
 +
 
 +
NOTES:
 +
# 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 [[GEOS-Chem_vertical_grids#47-layer_reduced_vertical_grid|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 GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS Near-Real Time Data Products] page for more information about the individual data versions that are part of the [[MERRA]] archive.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:21, 2 June 2017 (UTC)
 +
 
 +
=== References ===
 +
 
 +
For more information about the MERRA reanalysis product, please see:
 +
 
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/merra/MERRA_File_Specification.pdf MERRA File Specification Document (03 Aug 2012)]
 +
#[[MERRA|MERRA on the GEOS-Chem wiki]]
 +
#[[List of MERRA met fields|List of MERRA met fields used by GEOS-Chem]]
 +
#[[MERRA#MERRA grid structure|MERRA grid structure]]
 +
#[[MERRA#MERRA file naming convention|MERRA file naming convention]]
 +
# [[MERRA#MERRA file collections|MERRA data file collections (aka file types)]]
 +
# [[MERRA#MERRA time archiving|MERRA time archiving]]
 +
#[http://disc.sci.gsfc.nasa.gov/mdisc/mdisc/data-holdings/merra-mainstream-and-spinup-data MERRA mainstream and spinup data]
 +
#[http://disc.sci.gsfc.nasa.gov/daac-bin/DataHoldings.pl MERRA data holdings at GSFC]
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS5_Glossary_11_01_2011.pdf Glossary of variables produced by the GEOS-DAS]
 +
#[https://gmao.gsfc.nasa.gov/GMAO_products/reanalysis_products.php GMAO reanalysis products]
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:21, 2 June 2017 (UTC)
 +
 
 +
== GEOS-5 ==
 +
 
 +
<span style="color:red">'''''NASA/GMAO ceased production of GEOS-5.2.0 data as of June 2013. See GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php 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]].'''''</span>
 +
 
 +
 
 +
'''[[GEOS-5]]''' is the GEOS-Chem data archive corresponding to the GMAO [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.1.0] and [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.2.0] data products.  
 +
 
 +
=== Summary ===
 +
 
 +
{| border=1 cellspacing=0 cellpadding=5
 +
 
 +
|-valign="top"
 +
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|[[GEOS-5]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 +
|GEOS Data Assimilation System (GEOS-DAS)
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.1.0]: 01 Dec 2003 - 31 Aug 2008
 +
*Version [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS-5.2.0]: 01 Sep 2008 - 31 May 2013
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native horizontal grid:
 +
|[[GEOS-Chem_horizontal_grids#GMAO_0.5_x_0.666_grid|0.5&deg; x 0.666&deg;]]
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native vertical grid:
 +
|[[GEOS-Chem_vertical_grids#72-layer_vertical_grid|72 hybrid levels]]; model top at 0.01 hPa
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native file format:
 +
|HDF4-EOS
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Temporal coverage:
 +
|
 +
*2004-2012
 +
*Partial coverage for 2003 and 2013
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|We regridded to:
 +
|
 +
*0.5&deg; x 0.666&deg; [[GEOS-Chem_horizontal_grids#0.5_x_0.666_CH_nested_grid|China/SE Asia]], [[GEOS-Chem_horizontal_grids#0.5_x_0.666_EU_nested_grid|Europe]], and [[GEOS-Chem_horizontal_grids#0.5_x_0.666_NA_nested_grid|North America]] nested grids with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]] with 72 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 72 hybrid layers
 +
 
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Strengths:
 +
|
 +
*High resolution will facilitate comparison to satellites
 +
*Convection, optical depth better than in GEOS–4
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|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 [[GEOS-Chem_vertical_grids#47-layer_reduced_vertical_grid|47 vertical levels]].  This is done for computational expediency.
 +
# The new [[GEOS-5#GEOS-5.7.2 data product|GEOS-5.7.2 data product]] was officially released in 2011.  This data set has increased horizontal resolution (0.25&deg; x 0.3125&deg;), but the same # of vertical levels (72) as the older GEOS-5 and MERRA products.
 +
#Please also see this document which details the [http://gmao.gsfc.nasa.gov/pubs/docs/tm28.pdf evolution of the GEOS-5 system from GEOS-5.2.0/MERRA to GEOS-5.7.2 (aka "Fortuna")].
 +
# Please also see GMAO's [https://gmao.gsfc.nasa.gov/GMAO_products/NRT_products.php GEOS Near-Real Time Data Products] page for more information about the individual data versions that are part of the [[GEOS-5]] archive.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 20:27, 23 November 2016 (UTC)
 +
 
 +
=== References ===
 +
 
 +
#[[List of GEOS-5 met fields|List of GEOS-5 met fields used by GEOS-Chem]]
 +
#[[GEOS-5 issues|GEOS-5 issues encountered w/r/t GEOS-Chem]]
 +
#[[GEOS-5 met field reprocessing|Reprocessing of GEOS-5 met data for GEOS-Chem (completed Jul 2009)]]
 +
#[http://gmao.gsfc.nasa.gov/products/ GEOS-5 products page at GMAO]
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS-5.2.0-File_Specification.pdf GEOS-5 File Specification Document (version 5.2.0)]
 +
#[http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS5_Glossary_11_01_2011.pdf Glossary of variables produced by the GEOS-DAS]
 +
 
 +
--[[User:Bmy|Bob Y.]] 12:04, 19 August 2013 (EDT)
 +
 
 +
== GEOS-4 ==
 +
<span style="color:red">'''''[[GMAO GEOS-4|GEOS-4]] is now obsolete and will be de-supported in [[GEOS-Chem v11-02]].  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.'''''</span>
 +
 
 +
<span style="color:red">'''''Support for GEOS-4 meteorology was removed from [[GEOS-Chem v11-02#v11-02d|v11-02d]] and later versions.'''''</span>
 +
 
 +
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 [[GMAO GEOS-4|GEOS-4 wiki page]] for more information.
 +
 
 +
=== Summary ===
 +
 
 +
{| border=1 cellspacing=0 cellpadding=5
 +
 
 +
|-valign="top"
 +
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|[[GMAO GEOS-4|GEOS-4]]
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 +
|NCAR fvCCM GCM
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native horizontal grid:
 +
|[[GEOS-Chem_horizontal_grids#GMAO_1_x_1.25_grid|1&deg; x 1.25&deg;]]
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native vertical grid:
 +
|[[GEOS-Chem_vertical_grids#55-layer_vertical_grid|55 hybrid levels]]; model top at 0.01 hPa
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Native file format:
 +
|HDF4-EOS
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Temporal coverage:
 +
|1985-2006; some 2007
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|We regridded to:
 +
|
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 _grid|2&deg; x 2.5&deg;]] with 55 hybrid layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 55 hybrid layers
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Strengths:
 +
|
 +
*Long temporal horizon – 20 years of consistent met data
 +
*U and V winds are 6-hr averages, not instantaneous
 +
*Much better STE than any prior GEOS met fields
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|Weaknesses:
 +
|
 +
*Convection variables totally different than GEOS–3
 +
*GMAO was unhappy w/ the convection results
 +
*Cloud OD’s are too low; J-values, chemistry are “too hot”
 +
|}
 +
 
 +
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 [http://acmg.seas.harvard.edu/geos/doc/archive/man.v10-01/appendix_3.html#GEOS-4_reduced 30 vertical levels].  This is done for computational expediency.
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:29, 2 June 2017 (UTC)
 +
 
 +
=== References ===
 +
 
 +
#[[GMAO GEOS-4|GEOS-4 on the GEOS-Chem wiki]]
 +
#[[GMAO GEOS-4#Validation|Documents which describe the validation of GEOS-4 met fields in GEOS-Chem]]
 +
#[[GMAO GEOS-4#References|GEOS-4 references]]
 +
#[[List_of_GEOS-4_met_fields| List of GEOS-4 met fields]]
 +
#[http://acmg.seas.harvard.edu/geos/geos_sim.html Availability of GEOS-4 met fields]
 +
 
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:29, 2 June 2017 (UTC)
  
 
== GEOS-3 ==
 
== GEOS-3 ==
 +
 +
<span style="color:red">'''''GEOS-3 is now obsolete and was de-supported in [[GEOS-Chem v9-01-03]].  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.'''''</span>
 +
 +
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.
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
−
|-
+
|-valign="top"
−
|''Assimilation GCM used:''
+
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|GEOS-3
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 
|NASA/GSFC GEOS–3 GCM
 
|NASA/GSFC GEOS–3 GCM
 
|-valign="top"
 
|-valign="top"
−
|''Native horizontal grid:''
+
!bgcolor="#CCCCCC"|Native horizontal grid:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.5 1&deg; x 1&deg;]
+
|[[GEOS-Chem_horizontal_grids#GMAO_1_x_1_grid|1&deg; x 1&deg;]]
 
|-valign="top"
 
|-valign="top"
−
|''Native vertical grid:''
+
!bgcolor="#CCCCCC"|Native vertical grid:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_3.html#A3.3 48 sigma levels]; model top at 0.01 hPa
+
|48 sigma levels; model top at 0.01 hPa
 
|-valign="top"
 
|-valign="top"
−
|''Native file format:''
+
!bgcolor="#CCCCCC"|Native file format:
 
|HDF4-EOS
 
|HDF4-EOS
 
|-valign="top"
 
|-valign="top"
−
|''Temporal coverage:''
+
!bgcolor="#CCCCCC"|Temporal coverage:
 
|2000-2002
 
|2000-2002
 
|-valign="top"
 
|-valign="top"
−
|''We regridded to:''
+
!bgcolor="#CCCCCC"|We regridded to:
−
|1&deg; x 1&deg; nested grids, [http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2&deg; x 2.5&deg;], [http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4&deg; x 5&deg;] at 48 sigma layers
+
|
 +
*[[GEOS-Chem_horizontal_grids#GMAO 1 x 1 grid|1&deg; x 1&deg;]] nested grids with 48 sigma layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]] with 48 sigma layers
 +
*[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 48 sigma layers
 
|-valign="top"
 
|-valign="top"
−
|''Strengths:''
+
!bgcolor="#CCCCCC"|Strengths:
 
|
 
|
−
*High resolution made 1&deg; x 1deg; nested sims possible
+
*High resolution made 1&deg; x 1deg; nested sims possible
 
*Higher model top
 
*Higher model top
 
|-valign="top"
 
|-valign="top"
−
|''Weaknesses:''
+
!bgcolor="#CCCCCC"|Weaknesses:
 
|
 
|
 
*P to sigma vertical interpolation had to be done
 
*P to sigma vertical interpolation had to be done
Line 98: Line 572:
 
*U, V winds were very noisy at the top of the atmosphere
 
*U, V winds were very noisy at the top of the atmosphere
 
|}
 
|}
 +
 +
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.
 +
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 16:31, 2 June 2017 (UTC)
  
 
== GEOS-1 and GEOS-STRAT ==
 
== GEOS-1 and GEOS-STRAT ==
  
−
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 superceded by newer versions of GMAO met products and are no longer supported in GEOS-Chem.
+
<span style="color:red">'''''GEOS-1 and GEOS-STRAT are obsolete and are no longer supported in GEOS-Chem.  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.'''''</span>
 +
 
 +
GEOS-1 was the first GMAO met field data product compatible with GEOS-Chem.  GEOS-STRAT was a continuation of GEOS-1 (officially known as "GEOS-1-STRAT"), 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 ===
 
=== GEOS-1 features ===
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
−
|-
+
|-valign="top"
−
|''Assimilation GCM used:''
+
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|GEOS-1
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 
|NASA/GSFC GEOS1 GCM
 
|NASA/GSFC GEOS1 GCM
 
|-valign="top"
 
|-valign="top"
−
|''Native horizontal grid:''
+
!bgcolor="#CCCCCC"|Native horizontal grid:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2&deg; x 2.5&deg;]  
+
|[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]]
 
|-valign="top"
 
|-valign="top"
−
|''Native vertical grid:''
+
!bgcolor="#CCCCCC"|Native vertical grid:
 
|20 pure-sigma layers, model top at 10 hPa
 
|20 pure-sigma layers, model top at 10 hPa
 
|-valign="top"
 
|-valign="top"
−
|''Native file format:''
+
!bgcolor="#CCCCCC"|Native file format:
 
|NASA PHOENIX format (binary Fortran unformatted)
 
|NASA PHOENIX format (binary Fortran unformatted)
 
|-valign="top"
 
|-valign="top"
−
|''Temporal coverage:''
+
!bgcolor="#CCCCCC"|Temporal coverage:
 
|1985-1995
 
|1985-1995
 
|-valign="top"
 
|-valign="top"
−
|''We regridded to:''
+
!bgcolor="#CCCCCC"|We regridded to:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4 x 5]; 20 pure-sigma layers
+
|[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 20 pure-sigma layers
 
|-valign="top"
 
|-valign="top"
−
|''Strengths:''
+
!bgcolor="#CCCCCC"|Strengths:
 
|
 
|
 
*Long temporal coverage (10 years)
 
*Long temporal coverage (10 years)
 
|-valign="top"
 
|-valign="top"
−
|''Weaknesses:''
+
!bgcolor="#CCCCCC"|Weaknesses:
 
|
 
|
 
*Very low model top (10 hPa)
 
*Very low model top (10 hPa)
 
*Strat-trop exchange was too fast by 2-3X
 
*Strat-trop exchange was too fast by 2-3X
 
|}
 
|}
 +
 +
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 20:56, 23 November 2016 (UTC)
  
 
=== GEOS-STRAT features ===
 
=== GEOS-STRAT features ===
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
−
|-
+
|-valign="top"
−
|''Assimilation GCM used:''
+
!width="300px" bgcolor="#CCCCCC"|GEOS-Chem met archive name:
 +
|width="700px"|GEOS-STRAT
 +
|-valign="top"
 +
!bgcolor="#CCCCCC"|GMAO data assimilation system that was used to create these data files:
 
|NASA/GSFC GEOS1 GCM
 
|NASA/GSFC GEOS1 GCM
 
|-valign="top"
 
|-valign="top"
−
|''Native horizontal grid:''
+
!bgcolor="#CCCCCC"|Native horizontal grid:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2&deg; x 2.5&deg;]  
+
|[[GEOS-Chem_horizontal_grids#GMAO 2 x 2.5 grid|2&deg; x 2.5&deg;]]
 
|-valign="top"
 
|-valign="top"
−
|''Native vertical grid:''
+
!bgcolor="#CCCCCC"|Native vertical grid:
 
|46 pure-sigma layers, model top at 0.1 hPa
 
|46 pure-sigma layers, model top at 0.1 hPa
 
|-valign="top"
 
|-valign="top"
−
|''Native file format:''
+
!bgcolor="#CCCCCC"|Native file format:
 
|NASA PHOENIX format (binary Fortran unformatted)
 
|NASA PHOENIX format (binary Fortran unformatted)
 
|-valign="top"
 
|-valign="top"
−
|''Temporal coverage:''
+
!bgcolor="#CCCCCC"|Temporal coverage:
 
|1996-1997 (some 1998)
 
|1996-1997 (some 1998)
 
|-valign="top"
 
|-valign="top"
−
|''We regridded to:''
+
!bgcolor="#CCCCCC"|We regridded to:
−
|[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4 x 5]; 26 pure-sigma layers
+
|[[GEOS-Chem_horizontal_grids#GMAO 4 x 5 grid|4&deg; x 5&deg;]] with 26 pure-sigma layers
 
|-valign="top"
 
|-valign="top"
−
|''Strengths:''
+
!bgcolor="#CCCCCC"|Strengths:
 
|
 
|
 
*Higher model top, better stratospheric representation
 
*Higher model top, better stratospheric representation
 
|-valign="top"
 
|-valign="top"
−
|''Weaknesses:''
+
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Latest revision as of 20:22, 20 September 2022

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.

GMAO met field comparison chart

Important notice from NASA/GMAO

Daniel Jacob wrote:

Dear GEOS-Chem user:

I write address some confusion about the different GEOS meteorological datasets produced by NASA GMAO and used by GEOS-Chem.

The two main data archives that you should use for your GEOS-Chem simulations are:

  1. The operational data stream from the GEOS Forward Processing (0.25° x 0.3125°, 72 levels) starting in 2012, which should be called GEOS-FP;
  2. The consistent MERRA-2 reanalysis for 1979-present (0.5° x 0.625°, 72 levels).

GEOS-Chem also supports older GEOS data sets including GEOS-4, GEOS-5, and MERRA. These are of inferior quality and GMAO does not want us to use them. They can still be useful to characterize model transport errors or the effects of different met fields for the same year, but should not be used for any other applications.

For more information see the GEOS-Chem narrative description at http://geos-chem.org/geos_chem_narrative.html

Daniel Jacob
02 Jun 2017

Side-by-side comparison of GMAO met data products

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 details see GMAO's GEOS Near-Real Time Data Products page.

  GEOS-1 GEOS-STRAT GEOS-3 GEOS-4 GEOS-5 MERRA MERRA-2 GEOS-FP
Data product type Operational Operational Operational Operational Operational Reanalysis Reanalysis Operational
Is this data still being produced? NO NO NO NO NO NO YES YES
Is this data still compatible with GEOS-Chem? NO NO NO Support for these products was removed
from GEOS-Chem v11-02d and later versions 		YES YES
Native vertical grid 20 sigma 26 sigma 48 sigma 55 hybrid 72 hybrid 72 hybrid or
42 pressure 		72 hybrid 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° 		0.5° x 0.625° 0.25° x 0.3125°
Native file format Binary Binary HDF4-EOS HDF4-EOS HDF4-EOS HDF4-EOS netCDF4 netCDF4
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° 0.5° x 0.625° global
0.5° x 0.625° nested
2° x 2.5°
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 		1979 - present 2012 - present
WE RECOMMEND NOT TO USE THESE OBSOLETE MET FIELD DATA PRODUCTS
See this notice from the preceding section

NOTES:

  1. 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.
  2. GEOS-1, GEOS-STRAT and GEOS-3 are now obsolete and are no longer supported for GEOS-Chem.
  3. MERRA is a long-term reanalysis done with version GEOS-5.2.0. It is no longer being produced.
  4. MERRA-2 is a long-term reanalysis done with version GEOS-5.12.4.
  5. 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).
  6. Please also see our GEOS-Chem vertical grids wiki page for more information about how the sigma and hybrid grids are defined.

--Bob Yantosca (talk) 16:18, 2 June 2017 (UTC)

GEOS-FP

GEOS-FP is the GEOS-Chem data archive corresponding the GMAO GEOS "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: April 2012-present

(Note constant fields are stored with date 2011/01/01)

We regridded to:
Strengths:
  • Ultra-high resolution will facilitate comparison to satellites
  • Detailed nested-grid simulations with GEOS-Chem are possible at 0.25° x 0.3125° resolution
Weaknesses:
  • Large data volume: 1 day of GEOS-FP “raw” data files for GEOS-Chem > 21 GB!

NOTES:

  1. 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").
  2. 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.
  3. 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 [[GEOS-Chem_vertical_grids#47-layer_reduced_vertical_grid|lump vertical vertical levels in the stratosphere] to gain computational advantage.
  4. Please also see GMAO's GEOS Near-Real Time Data Products page for more information about the GMAO data versions that are contained in our GEOS-FP archive.

--Bob Yantosca (talk) 16:03, 12 February 2018 (UTC)

References

For more information about the GMAO "forward processing" data product, please see:

  1. GEOS-FP file specification document, Version 1.0 (11 Jun 2013)
  2. GEOS-FP on the GEOS-Chem wiki
  3. List of GEOS-FP met fields used by GEOS-Chem
  4. GEOS-FP grid structure
  5. GEOS-FP file naming convention
  6. GEOS-FP data file collections (aka file types)
  7. GEOS-FP time archiving
  8. Glossary of variables produced by the GEOS-DAS
  9. 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 Yantosca (talk) 19:22, 23 November 2016 (UTC)

MERRA-2 reanalysis

MERRA-2 is the GEOS-Chem data archive corresponding to the GMAO MERRA-2 reanalysis met data product. This is the current GMAO reanalysis data set. It contains more than 30 years of assimilated data that can be used to drive GEOS-Chem simulations.

Summary

GEOS-Chem met archive name: MERRA-2
GMAO data assimilation system that was used to create these data files: GEOS Data Assimilation System (GEOS-DAS)
Native horizontal grid: 0.5° (lat) x 0.625° (lon)
Native vertical grid: 72 hybrid levels; model top at 0.01 hPa
Native file format: netCDF4 (based on HDF5)
Temporal coverage: 1980's thru 2010's
We are regridding to:
Strengths:
  • Ultra-high resolution will facilitate comparison to satellites
  • Detailed nested-grid simulations with GEOS-Chem are possible at 0.25° x 0.3125° resolution
Weaknesses:
  • Large data volume

NOTES:

  1. Please also see GMAO's GEOS Near-Real Time Data Products page for more information about the GMAO data versions that are contained in our GEOS-FP archive.

--Bob Yantosca (talk) 20:18, 23 November 2016 (UTC)

References

For more information about the MERRA-2 reanalysis data product, please see:

  1. MERRA-2 on the GEOS-Chem wiki
  2. List of MERRA-2 met fields used by GEOS-Chem
  3. MERRA-2 grid structure
  4. MERRA-2 file naming convention
  5. MERRA-2 data file collections (aka file types)
  6. MERRA-2 time archiving
  7. Glossary of variables produced by the GEOS-DAS
  8. GMAO reanalysis products

--Bob Yantosca (talk) 21:00, 9 February 2016 (UTC)

MERRA reanalysis

The MERRA reanalysis product ceased in early 2016 and is now obsolete. 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. MERRA will be de-supported in GEOS-Chem v11-02.

Support for MERRA meteorology was removed from v11-02d and later versions. MERRA data will continue to be hosted on the Dalhousie shared data archive for the foreseeable future.

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)
  • Version GEOS-5.3.0, used to create 3 separate data streams:
    • MERRA100: 01 Jan 1979 - 31 Dec 1992
    • MERRA200: 01 Jan 1993 - 31 Dec 2000
    • MERRA300: 01 Jan 2001 - present (scheduled to be turned off in 2015)
Native horizontal grid:
Native vertical grid:
  • 1 layer (surface fields)
  • 72 hybrid levels; model top at 0.01 hPa
  • 42 pressure levels (certain 3-D fields, such as moist quantities)
Native file format: HDF4-EOS
Temporal coverage: 1979-May 2015
  • NOTE: the GEOS-Chem data archive only includes data to the end of 2013.
We regridded to:
Strengths:
  • High resolution will facilitate comparison to satellites
  • Convection, optical depth better than in GEOS–4
Weaknesses:
  • Large data volume: 1 day of MERRA “raw” data files > 2 GB!

NOTES:

  1. 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.
  2. 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.
  3. Please also see GMAO's GEOS Near-Real Time Data Products page for more information about the individual data versions that are part of the MERRA archive.

--Bob Yantosca (talk) 16:21, 2 June 2017 (UTC)

References

For more information about the MERRA reanalysis product, please see:

  1. MERRA File Specification Document (03 Aug 2012)
  2. MERRA 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. GMAO reanalysis products

--Bob Yantosca (talk) 16:21, 2 June 2017 (UTC)

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.


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: 0.5° x 0.666°
Native vertical grid: 72 hybrid levels; model top at 0.01 hPa
Native file format: HDF4-EOS
Temporal coverage:
  • 2004-2012
  • Partial coverage for 2003 and 2013
We regridded to:
Strengths:
  • High resolution will facilitate comparison to satellites
  • Convection, optical depth better than in GEOS–4
Weaknesses:

NOTES:

  1. 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.
  2. 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.
  3. 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").
  4. Please also see GMAO's GEOS Near-Real Time Data Products page for more information about the individual data versions that are part of the GEOS-5 archive.

--Bob Yantosca (talk) 20:27, 23 November 2016 (UTC)

References

  1. List of GEOS-5 met fields used by GEOS-Chem
  2. GEOS-5 issues encountered w/r/t GEOS-Chem
  3. Reprocessing of GEOS-5 met data for GEOS-Chem (completed Jul 2009)
  4. GEOS-5 products page at GMAO
  5. GEOS-5 File Specification Document (version 5.2.0)
  6. Glossary of variables produced by the GEOS-DAS

--Bob Y. 12:04, 19 August 2013 (EDT)

GEOS-4

GEOS-4 is now obsolete and will be de-supported in GEOS-Chem v11-02. 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.

Support for GEOS-4 meteorology was removed from v11-02d and later versions.

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:
Strengths:
  • Long temporal horizon – 20 years of consistent met data
  • U and V winds are 6-hr averages, not instantaneous
  • Much better STE than any prior GEOS met fields
Weaknesses:
  • Convection variables totally different than GEOS–3
  • GMAO was unhappy w/ the convection results
  • Cloud OD’s are too low; J-values, chemistry are “too hot”

NOTES:

  1. 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.

--Bob Yantosca (talk) 16:29, 2 June 2017 (UTC)

References

  1. GEOS-4 on the GEOS-Chem wiki
  2. Documents which describe the validation of GEOS-4 met fields in GEOS-Chem
  3. GEOS-4 references
  4. List of GEOS-4 met fields
  5. Availability of GEOS-4 met fields

--Bob Yantosca (talk) 16:29, 2 June 2017 (UTC)

GEOS-3

GEOS-3 is now obsolete and was de-supported in GEOS-Chem v9-01-03. 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-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.

GEOS-Chem met archive name: GEOS-3
GMAO data assimilation system that was used to create these data files: 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:
Strengths:
  • High resolution made 1° x 1deg; nested sims possible
  • Higher model top
Weaknesses:
  • P to sigma vertical interpolation had to be done
  • STE still not realistic
  • U, V winds were very noisy at the top of the atmosphere

NOTES:

  1. 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 Yantosca (talk) 16:31, 2 June 2017 (UTC)

GEOS-1 and GEOS-STRAT

GEOS-1 and GEOS-STRAT are obsolete and are no longer supported in GEOS-Chem. 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-1 was the first GMAO met field data product compatible with GEOS-Chem. GEOS-STRAT was a continuation of GEOS-1 (officially known as "GEOS-1-STRAT"), 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

GEOS-Chem met archive name: GEOS-1
GMAO data assimilation system that was used to create these data files: 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° with 20 pure-sigma layers
Strengths:
  • Long temporal coverage (10 years)
Weaknesses:
  • Very low model top (10 hPa)
  • Strat-trop exchange was too fast by 2-3X

--Bob Yantosca (talk) 20:56, 23 November 2016 (UTC)

GEOS-STRAT features

GEOS-Chem met archive name: GEOS-STRAT
GMAO data assimilation system that was used to create these data files: 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° with 26 pure-sigma layers
Strengths:
  • Higher model top, better stratospheric representation
Weaknesses:
  • Vertical grid did not correspond to GEOS–1
  • STE still too fast by 2-3X
  • Surface data had a 6-hr temporal resolution, we had to interpolate to a 3-hr temporal resolution ourselves

--Bob Yantosca (talk) 20:58, 23 November 2016 (UTC)

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