Difference between revisions of "MERRA-2 implementation details"

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m (Melissa Payer moved page MERRA2 implementation details to MERRA-2 implementation details: Use official product name from GMAO)
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== Overview ==
 
== Overview ==
  
−
[[MERRA2]] is the newest reanalysis meteorological data product from [http://gmao.gsfc.nasa.gov NASA/GMAO].  It is created with the NASA/GMAO GEOS Data Assimilation System (aka GEOS-DAS), [[Version_history_of_GMAO_met_data_products#MERRA2|version 5.12.4]].  Overall, the structure of MERRA2 is very similar to the GMAO "forward processing" data product, which we refer to as [[GEOS-FP]].  Therefore, within GEOS-Chem we can (for the most part) treat MERRA2 in the same way as we do for the GEOS_FP.
+
[[MERRA-2]] is the newest reanalysis meteorological data product from [http://gmao.gsfc.nasa.gov NASA/GMAO].  It is created with the NASA/GMAO GEOS Data Assimilation System (aka GEOS-DAS), [[Version_history_of_GMAO_met_data_products#MERRA-2|version 5.12.4]].  Overall, the structure of MERRA-2 is very similar to the GMAO "forward processing" data product, which we refer to as [[GEOS-FP]].  Therefore, within GEOS-Chem we can (for the most part) treat MERRA-2 in the same way as we do for the GEOS_FP.
  
−
For more information about MERRA2, please see these resources:
+
For more information about MERRA-2, please see these resources:
  
−
*[[MERRA2|''MERRA2'' page on the GEOS-Chem wiki]]
+
*[[MERRA-2|''MERRA-2'' page on the GEOS-Chem wiki]]
−
*[[List of MERRA2 met fields|List of MERRA2 met fields used for GEOS-Chem]]
+
*[[List of MERRA-2 met fields|List of MERRA-2 met fields used for GEOS-Chem]]
 
*[[Version history of GMAO met data products]]
 
*[[Version history of GMAO met data products]]
  
−
=== Comparing MERRA2 to other GMAO met data products ===
+
=== Comparing MERRA-2 to other GMAO met data products ===
  
−
The table below compares many features of MERRA2 with other GMAO met data products:
+
The table below compares many features of MERRA-2 with other GMAO met data products:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
 
|-bgcolor="#CCCCCC"
 
|-bgcolor="#CCCCCC"
 
!width="250px"|Feature
 
!width="250px"|Feature
−
!bgcolor="#CCFFFF" width="200px"|[[MERRA2]]
+
!bgcolor="#CCFFFF" width="200px"|[[MERRA-2]]
 
!width="200px"|[[GEOS-FP]]
 
!width="200px"|[[GEOS-FP]]
 
!width="200px"|[[MERRA]]
 
!width="200px"|[[MERRA]]
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*72 hybrid levels
 
*72 hybrid levels
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
  
 
|-valign="top"
 
|-valign="top"
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*PHIS
 
*PHIS
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
  
 
|-valign="top"
 
|-valign="top"
Line 68: Line 68:
 
*A1 (1-hr time averaged)
 
*A1 (1-hr time averaged)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*A3 (6-hr time average)
 
*A3 (6-hr time average)
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*I3 (3-hr instantaneous)
 
*I3 (3-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*A3 (3-hr time average)
 
*A3 (3-hr time average)
Line 92: Line 92:
 
|Timestamps
 
|Timestamps
 
|bgcolor="#CCFFFF"|
 
|bgcolor="#CCFFFF"|
−
*[[MERRA2#MERRA2_time_archiving|See this wiki page]]
+
*[[MERRA-2#MERRA-2_time_archiving|See this wiki page]]
 
|
 
|
 
*[[GEOS-FP#GEOS-FP_time_archiving|See this wiki page]]
 
*[[GEOS-FP#GEOS-FP_time_archiving|See this wiki page]]
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*REEVAPCN, REEVAPLSAN
 
*REEVAPCN, REEVAPLSAN
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*DQIDTMST
 
*DQIDTMST
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*I3 (3-hr instantaneous)
 
*I3 (3-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A3 (6-hr time average)
 
*A3 (6-hr time average)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A6 (6-hr time average)
 
*A6 (6-hr time average)
  
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*A3 (3-hr time average)
 
*A3 (3-hr time average)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*I3 (6-hr instantaneous)
 
*I3 (6-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A6 (6-hr time-averaged)
 
*A6 (6-hr time-averaged)
  
Line 153: Line 153:
 
*I3 (3-hr instantaneous)
 
*I3 (3-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A3 (3-hr time average)
 
*A3 (3-hr time average)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A6 (6-hr time-averaged)
 
*A6 (6-hr time-averaged)
  
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*A3 (3-hr time average)
 
*A3 (3-hr time average)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*I6 (6-hr instantaneous)
 
*I6 (6-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A6 (6-hr time-averaged)
 
*A6 (6-hr time-averaged)
  
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*A1 (1-hr time average)
 
*A1 (1-hr time average)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*I6 (6-hr instantaneous)
 
*I6 (6-hr instantaneous)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
*A6 (3-hr time-average)
 
*A6 (3-hr time-average)
  
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*[[List_of_MERRA_met_fields#SNOMAS|Missing coverage at poles is now corrected, as per MERRA]]
 
*[[List_of_MERRA_met_fields#SNOMAS|Missing coverage at poles is now corrected, as per MERRA]]
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*SNOMAS [m]
 
*SNOMAS [m]
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|
 
|
 
*SLP [hPa]
 
*SLP [hPa]
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*SLP [hPa]
 
*SLP [hPa]
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*SLP [hPa]
 
*SLP [hPa]
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|
 
|
 
*TROPPT [hPa]
 
*TROPPT [hPa]
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*TROPPT [hPa]
 
*TROPPT [hPa]
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*TROPP [hPa]
 
*TROPP [hPa]
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*<tt>DO_MERRA_CONVECTION</tt><br>(in <tt>convection_mod.F</tt>)
 
*<tt>DO_MERRA_CONVECTION</tt><br>(in <tt>convection_mod.F</tt>)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*<tt>NFCLDMX</tt><br>(in <tt>convection_mod.F</tt>)
 
*<tt>NFCLDMX</tt><br>(in <tt>convection_mod.F</tt>)
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*<tt>WETDEP_MERRA</tt><br>(<tt>wetscav_mod.F</tt>)
 
*<tt>WETDEP_MERRA</tt><br>(<tt>wetscav_mod.F</tt>)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
 
*<tt>WETDEP</tt><br>(<tt>wetscav_mod.F</tt>)
 
*<tt>WETDEP</tt><br>(<tt>wetscav_mod.F</tt>)
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*<tt>TPCORE_FVDAS</tt><br>(<tt>tpcore_fvdas_mod.F90</tt>)
 
*<tt>TPCORE_FVDAS</tt><br>(<tt>tpcore_fvdas_mod.F90</tt>)
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
 
|
 
|
−
*Same as MERRA2
+
*Same as MERRA-2
  
 
|-valign="top"
 
|-valign="top"
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==== Initial modifications ====
 
==== Initial modifications ====
  
−
As of August 2015, we have [[#Required coding changes in GEOS-Chem|we have modified GEOS-Chem (as described below)]] so that it can be driven by the new [[MERRA2|NASA/GMAO MERRA2 reanalysis data product]].  These source code updates were validated
+
As of August 2015, we have [[#Required coding changes in GEOS-Chem|we have modified GEOS-Chem (as described below)]] so that it can be driven by the new [[MERRA-2|NASA/GMAO MERRA-2 reanalysis data product]].  These source code updates were validated
 
with the 1-month benchmark simulation [[GEOS-Chem v11-01 benchmark history#v11-01c|v11-01c]] and approved on 14 Sept 2015.
 
with the 1-month benchmark simulation [[GEOS-Chem v11-01 benchmark history#v11-01c|v11-01c]] and approved on 14 Sept 2015.
  
−
Currently, several of the GEOS-Chem specialty simulations are already compatible with MERRA2.  These include:
+
Currently, several of the GEOS-Chem specialty simulations are already compatible with MERRA-2.  These include:
  
 
*[[CO2_simulation|CO2 simulation]]
 
*[[CO2_simulation|CO2 simulation]]
Line 326: Line 326:
 
==== Modifications for the nested grid simulations ====
 
==== Modifications for the nested grid simulations ====
  
−
There were several modifications needed to run [[GEOS-Chem_nested_grid_simulations|nested grid simulations]] with MERRA2. The source code updates for running MERRA2 on the 0.5x0.625 nested NA and nested CH grids were included in [[GEOS-Chem v11-01 benchmark history#v11-01e|v11-01e]] (approved 04 Jan 2016).
+
There were several modifications needed to run [[GEOS-Chem_nested_grid_simulations|nested grid simulations]] with MERRA-2. The source code updates for running MERRA-2 on the 0.5x0.625 nested NA and nested CH grids were included in [[GEOS-Chem v11-01 benchmark history#v11-01e|v11-01e]] (approved 04 Jan 2016).
  
 
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 17:13, 14 December 2015 (UTC)
 
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 17:13, 14 December 2015 (UTC)
Line 332: Line 332:
 
==== In the pipeline ====
 
==== In the pipeline ====
  
−
Making the various [[GEOS-Chem_chemistry_mechanisms#NOx-Ox-hydrocarbon-aerosol_chemistry_and_variants|"full-chemistry simulations"]] (i.e. those using the benchmark, UCX, SOA, and tropchem chemistry mechanisms) compatible with MERRA2 will take longer.  These "full-chemistry" simulations use emissions (e.g. lightning, dust) that have scale factors that must be tuned specifically for each met field product. As of February 2016, the [[GEOS-Chem Support Team|GCST]] is working on computing the dust and lightning scale factors using MERRA2 met fields for 2009&ndash;2014. '''''This update is slated for inclusion in [[GEOS-Chem v11-01#v11-01f|v11-01f]].'''''
+
Making the various [[GEOS-Chem_chemistry_mechanisms#NOx-Ox-hydrocarbon-aerosol_chemistry_and_variants|"full-chemistry simulations"]] (i.e. those using the benchmark, UCX, SOA, and tropchem chemistry mechanisms) compatible with MERRA-2 will take longer.  These "full-chemistry" simulations use emissions (e.g. lightning, dust) that have scale factors that must be tuned specifically for each met field product. As of February 2016, the [[GEOS-Chem Support Team|GCST]] is working on computing the dust and lightning scale factors using MERRA-2 met fields for 2009&ndash;2014. '''''This update is slated for inclusion in [[GEOS-Chem v11-01#v11-01f|v11-01f]].'''''
  
−
When the entire MERRA2 coverage period (1980&ndash;present) has been processed, the lightning and dust scale factors for MERRA2 will be adjusted as needed.
+
When the entire MERRA-2 coverage period (1980&ndash;present) has been processed, the lightning and dust scale factors for MERRA-2 will be adjusted as needed.
  
 
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 21:08, 5 February 2016 (UTC)
 
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 21:08, 5 February 2016 (UTC)
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== Required coding changes in GEOS-Chem ==
 
== Required coding changes in GEOS-Chem ==
 
   
 
   
−
As noted in the section above, the similarities between [[MERRA2]] and [[GEOS-FP]] (especially of the vertical grids) means that in most cases we can just treat MERRA2 in the same way as for GEOS-FP.  In many areas of the code, the coding changes are straightforward and simply involve an extension of C-preprocessor statements such as:
+
As noted in the section above, the similarities between [[MERRA-2]] and [[GEOS-FP]] (especially of the vertical grids) means that in most cases we can just treat MERRA-2 in the same way as for GEOS-FP.  In many areas of the code, the coding changes are straightforward and simply involve an extension of C-preprocessor statements such as:
  
 
  #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )
 
  #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )
Line 346: Line 346:
 
to  
 
to  
 
   
 
   
−
  #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
+
  #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
  
−
In other areas of GEOS-Chem the changes are more involved.  Below we provide a description of the areas of GEOS-Chem that were modified for MERRA2:
+
In other areas of GEOS-Chem the changes are more involved.  Below we provide a description of the areas of GEOS-Chem that were modified for MERRA-2:
  
 
=== Top-level directory ===
 
=== Top-level directory ===
  
−
The following modifications for [[MERRA2]] were made in the root GEOS-Chem directory:
+
The following modifications for [[MERRA-2]] were made in the root GEOS-Chem directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 361: Line 361:
 
|Makefile_header.mk     
 
|Makefile_header.mk     
 
|
 
|
−
*If <tt>MET=merra2</tt> or <tt>MET=merra-2</tt> (case-insensitive), then activate the <tt>MERRA2</tt> C-preprocessor switch
+
*If <tt>MET=merra2</tt> or <tt>MET=merra-2</tt> (case-insensitive), then activate the <tt>MERRA-2</tt> C-preprocessor switch
−
**i.e. Add <tt>-DMERRA2</tt> to the Makefile variable <tt>USER_DEFS</tt>.
+
**i.e. Add <tt>-DMERRA-2</tt> to the Makefile variable <tt>USER_DEFS</tt>.
 
*If <tt>GRID=05x0625</tt> is added, then activate the <tt>GRID05x0625</tt> C-preprocessor switch
 
*If <tt>GRID=05x0625</tt> is added, then activate the <tt>GRID05x0625</tt> C-preprocessor switch
 
**i.e. Add <tt>-DGRID05x0625</tt> to the Makefile variable <tt>USER_DEFS</tt>.
 
**i.e. Add <tt>-DGRID05x0625</tt> to the Makefile variable <tt>USER_DEFS</tt>.
Line 371: Line 371:
 
=== Headers directory ===
 
=== Headers directory ===
  
−
The following modifications for [[MERRA2]] were made in the <tt>Headers/</tt> directory:
+
The following modifications for [[MERRA-2]] were made in the <tt>Headers/</tt> directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 384: Line 384:
 
|gigc_input_opt_mod.F90     
 
|gigc_input_opt_mod.F90     
 
|
 
|
−
*Add <tt>MERRA2_DIR</tt> to the <tt>OptInput</tt> derived type
+
*Add <tt>MERRA-2_DIR</tt> to the <tt>OptInput</tt> derived type
−
*Set <tt>Input_Opt%MERRA2_DIR = './'</tt> in routine <tt>Init_GIGC_Input_Opt</tt>
+
*Set <tt>Input_Opt%MERRA-2_DIR = './'</tt> in routine <tt>Init_GIGC_Input_Opt</tt>
 
|-valign="top"
 
|-valign="top"
 
|gigc_state_met_mod.F90     
 
|gigc_state_met_mod.F90     
 
|Multiple instances:
 
|Multiple instances:
−
*Now use: <tt>#if defined( GEOS_FP ) || defined( MERRA ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_FP ) || defined( MERRA ) || defined( MERRA-2 )</tt>
  
 
|}
 
|}
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=== GeosUtil directory ===
 
=== GeosUtil directory ===
  
−
The following modifications for [[MERRA2]] were made in the <tt>GeosUtil/</tt> directory:
+
The following modifications for [[MERRA-2]] were made in the <tt>GeosUtil/</tt> directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 407: Line 407:
 
|bpch2_mod.F     
 
|bpch2_mod.F     
 
|In routine GET_MODELNAME:  
 
|In routine GET_MODELNAME:  
−
*Add <tt>MERRA2_47L</tt> and <tt>MERRA2</tt> modelnames to the <tt>#if</tt> block
+
*Add <tt>MERRA-2_47L</tt> and <tt>MERRA-2</tt> modelnames to the <tt>#if</tt> block
 
In routine GET_NAME_EXT:  
 
In routine GET_NAME_EXT:  
−
*Return grid name <tt>merra2</tt> for MERRA2 fields
+
*Return grid name <tt>merra2</tt> for MERRA-2 fields
 
In routine GET_NAME_EXT_2D:  
 
In routine GET_NAME_EXT_2D:  
−
*Now use <tt>#if defined( MERRA ) || defined( MERRA2 )
+
*Now use <tt>#if defined( MERRA ) || defined( MERRA-2 )
 
In routine GET_RES_EXT:
 
In routine GET_RES_EXT:
 
*Return resolution string <tt>05x0625</tt> for 0.5&deg; x 0.625&deg; grids
 
*Return resolution string <tt>05x0625</tt> for 0.5&deg; x 0.625&deg; grids
Line 418: Line 418:
 
|pressure_mod.F
 
|pressure_mod.F
 
|In routines GET_PEDGE and GET_PEDGE_FULLGRID:
 
|In routines GET_PEDGE and GET_PEDGE_FULLGRID:
−
*Compute PEDGE for MERRA2 in the same way as for GEOS-5, MERRA, and GEOS-FP
+
*Compute PEDGE for MERRA-2 in the same way as for GEOS-5, MERRA, and GEOS-FP
 
In routine INIT_PRESSURE:  
 
In routine INIT_PRESSURE:  
−
*Initialize Ap and Bp for MERRA2 in the same way as for GEOS-5, MERRA, and GEOS-FP
+
*Initialize Ap and Bp for MERRA-2 in the same way as for GEOS-5, MERRA, and GEOS-FP
  
 
|-valign="top"
 
|-valign="top"
 
|time_mod.F
 
|time_mod.F
 
|In routine GET_A1_TIME:
 
|In routine GET_A1_TIME:
−
*Compute the <tt>DATE</tt> array for MERRA2 the same way as is done for MERRA and GEOS-FP
+
*Compute the <tt>DATE</tt> array for MERRA-2 the same way as is done for MERRA and GEOS-FP
  
 
|-valign="top"
 
|-valign="top"
 
|transfer_mod.F
 
|transfer_mod.F
 
|In routine INIT_TRANSFER:
 
|In routine INIT_TRANSFER:
−
*Set <tt>L_COPY = 36</tt> for MERRA2
+
*Set <tt>L_COPY = 36</tt> for MERRA-2
−
*Changed code to <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In several routines:
 
In several routines:
−
*Changed code to <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
|}
 
|}
  
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=== GeosCore directory ===
 
=== GeosCore directory ===
  
−
The following modifications for [[MERRA2]] were made in the <tt>GeosCore/</tt> directory:
+
The following modifications for [[MERRA-2]] were made in the <tt>GeosCore/</tt> directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 450: Line 450:
 
|calcrate.F
 
|calcrate.F
 
|Multiple instances:
 
|Multiple instances:
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|carbon_mod.F
 
|carbon_mod.F
 
|Multiple instances:
 
|Multiple instances:
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|cldice_HbrHOBr_mod.F
 
|cldice_HbrHOBr_mod.F
 
|Multiple instances:
 
|Multiple instances:
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|convection_mod.F
 
|convection_mod.F
 
|In routine DO_CONVECTION:
 
|In routine DO_CONVECTION:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine DO_MERRA_CONVECTION:
 
In routine DO_MERRA_CONVECTION:
−
*Changed code to <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt> where we set PFICU and PFLCU
+
*Changed code to <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt> where we set PFICU and PFLCU
  
 
|-valign="top"
 
|-valign="top"
 
|dao_mod.F
 
|dao_mod.F
 
|In routine COPY_I6_FIELDS:
 
|In routine COPY_I6_FIELDS:
−
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine INTERP:  
 
In routine INTERP:  
−
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|depo_mercury_mod.F
 
|depo_mercury_mod.F
 
|In routine ADD_Hg2_SNOWPACK
 
|In routine ADD_Hg2_SNOWPACK
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|dao_mod.F
 
|dao_mod.F
 
|In routine COPY_I6_FIELDS:
 
|In routine COPY_I6_FIELDS:
−
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine INTERP:  
 
In routine INTERP:  
−
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|diag3.F
 
|diag3.F
 
|Multiple instances:
 
|Multiple instances:
−
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA2 )</tt>, etc.
+
*Changed code to: <tt>#if defined( GEOS_FP ) || defined( MERRA-2 )</tt>, etc.
  
 
|-valign="top"
 
|-valign="top"
Line 502: Line 502:
 
|In routine FAST_JX:
 
|In routine FAST_JX:
 
*Do cloud overlapping for GEOS-FP in the same way as for GEOS-5 and MERRA.   
 
*Do cloud overlapping for GEOS-FP in the same way as for GEOS-5 and MERRA.   
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
Line 517: Line 517:
 
|input_mod.F
 
|input_mod.F
 
|In routine READ_SIMULATION_MENU:  
 
|In routine READ_SIMULATION_MENU:  
−
*Now read value for <tt>Input_Opt%MERRA2_DIR</tt> from <tt>input.geos</tt>
+
*Now read value for <tt>Input_Opt%MERRA-2_DIR</tt> from <tt>input.geos</tt>
 
*Also set <tt>Input_Opt%RES_DIR</tt> accordingly for 0.5&deg; x 0.625&deg; nested grids
 
*Also set <tt>Input_Opt%RES_DIR</tt> accordingly for 0.5&deg; x 0.625&deg; nested grids
−
*Set LUNZIP=.FALSE. for MERRA2 met
+
*Set LUNZIP=.FALSE. for MERRA-2 met
 
In routine READ_CONVECTION_MENU:  
 
In routine READ_CONVECTION_MENU:  
−
*Change #if statement to allow non-local PBL mixing for MERRA2 met data
+
*Change #if statement to allow non-local PBL mixing for MERRA-2 met data
 
In routine VALIDATE_DIRECTORIES:  
 
In routine VALIDATE_DIRECTORIES:  
−
*Error check MERRA2_DIR for start & end date
+
*Error check MERRA-2_DIR for start & end date
  
 
|-valign="top"
 
|-valign="top"
Line 529: Line 529:
 
|
 
|
 
In routines LAND_MERCURY_FLUX:
 
In routines LAND_MERCURY_FLUX:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routines SOILEMIS:
 
In routines SOILEMIS:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
*Extend #if statement for variable SOIL_EMIS_FAC to get the code to compile w/o error.
 
*Extend #if statement for variable SOIL_EMIS_FAC to get the code to compile w/o error.
 
**<span style="color:red">Team Hg will need to supply an updated value later on.</span>
 
**<span style="color:red">Team Hg will need to supply an updated value later on.</span>
Line 538: Line 538:
 
|main.F
 
|main.F
 
|In main.F:
 
|In main.F:
−
*Changed code to <tt>if defined( GEOS_FP ) || defined( MERRA2 )</tt> where we define <tt>N_DYN_STEPS</tt>
+
*Changed code to <tt>if defined( GEOS_FP ) || defined( MERRA-2 )</tt> where we define <tt>N_DYN_STEPS</tt>
−
*Changed code to <tt>if defined( GEOS_FP ) || defined( MERRA2 )</tt> where we define <tt>Input_Opt%USE_O3_FROM_MET</tt>
+
*Changed code to <tt>if defined( GEOS_FP ) || defined( MERRA-2 )</tt> where we define <tt>Input_Opt%USE_O3_FROM_MET</tt>
 
In included routine READ_INITIAL_MET_FIELDS:
 
In included routine READ_INITIAL_MET_FIELDS:
 
*Added calls to routines from <tt>merra2_read_mod.F90</tt>
 
*Added calls to routines from <tt>merra2_read_mod.F90</tt>
Line 551: Line 551:
 
**For now use the same value as for the 0.5&deg; x 0.666&deg; grid.   
 
**For now use the same value as for the 0.5&deg; x 0.666&deg; grid.   
 
**<span style="color:red">Team Hg will need to supply an updated value later on.</span>
 
**<span style="color:red">Team Hg will need to supply an updated value later on.</span>
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
Line 563: Line 563:
 
|ocean_mercury_mod.F
 
|ocean_mercury_mod.F
 
|Multiple instances:
 
|Multiple instances:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|planeflight_mod.F
 
|planeflight_mod.F
 
|In routine PLANEFLIGHT
 
|In routine PLANEFLIGHT
−
*Now use: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|strat_chem_mod.F90
 
|strat_chem_mod.F90
 
|Multiple instances:
 
|Multiple instances:
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine DO_SYNOZ:
 
In routine DO_SYNOZ:
 
*Add placeholder values for 0.5&deg; x 0.625&deg; grids
 
*Add placeholder values for 0.5&deg; x 0.625&deg; grids
Line 580: Line 580:
 
|sulfate_mod.F
 
|sulfate_mod.F
 
|In routine CHEM_SO2:
 
|In routine CHEM_SO2:
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine INIT_SULFATE:
 
In routine INIT_SULFATE:
−
*Changed code to: <tt>#if !defined( GEOS_5 ) && !defined( MERRA ) && !defined( GEOS_FP ) && !defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if !defined( GEOS_5 ) && !defined( MERRA ) && !defined( GEOS_FP ) && !defined( MERRA-2 )</tt>
 
In routine SRCSFC30 (TOMAS-only):
 
In routine SRCSFC30 (TOMAS-only):
 
*Added a placeholder value for TSCALE for the 0.5&deg; x 0.625&deg; grids
 
*Added a placeholder value for TSCALE for the 0.5&deg; x 0.625&deg; grids
Line 589: Line 589:
 
|tagged_ox_mod.F
 
|tagged_ox_mod.F
 
|In routine GET_REGIONAL_POX:
 
|In routine GET_REGIONAL_POX:
−
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Now use: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|tpcore_bc_mod.F:
 
|tpcore_bc_mod.F:
 
|Multiple instances:
 
|Multiple instances:
−
*Added MERRA2 placeholder values for <tt>I1_BC_CH, I2_BC_CH, J1_BC_CH, J2_BC_CH</tt>  
+
*Added MERRA-2 placeholder values for <tt>I1_BC_CH, I2_BC_CH, J1_BC_CH, J2_BC_CH</tt>  
−
*Added MERRA2 placeholder values for <tt>I1_BC_EU, I2_BC_EU, J1_BC_EU, J2_BC_EU</tt>  
+
*Added MERRA-2 placeholder values for <tt>I1_BC_EU, I2_BC_EU, J1_BC_EU, J2_BC_EU</tt>  
−
*Added MERRA2 placeholder values for <tt>I1_BC_NA, I2_BC_NA, J1_BC_NA, J2_BC_NA</tt>  
+
*Added MERRA-2 placeholder values for <tt>I1_BC_NA, I2_BC_NA, J1_BC_NA, J2_BC_NA</tt>  
  
 
|-valign="top"
 
|-valign="top"
 
|vdiff_mod.F90
 
|vdiff_mod.F90
 
|In routine VDIFFDR:
 
|In routine VDIFFDR:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|wetscav_mod.F
 
|wetscav_mod.F
 
|In routine DO_WETDEP:
 
|In routine DO_WETDEP:
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine DO_WASHOUT_ONLY::
 
In routine DO_WASHOUT_ONLY::
−
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine MAKE_QQ:
 
In routine MAKE_QQ:
−
*Changed code to: <tt>#defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#defined( GEOS_FP ) || defined( MERRA-2 )</tt>
 
In routine RAINOUT:
 
In routine RAINOUT:
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|}
 
|}
Line 620: Line 620:
 
=== HEMCO/Core directory ===
 
=== HEMCO/Core directory ===
  
−
The following modifications for MERRA2 were made in the <tt>HEMCO/Core</tt> directory:
+
The following modifications for MERRA-2 were made in the <tt>HEMCO/Core</tt> directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 636: Line 636:
 
|hco_interp_mod.F90
 
|hco_interp_mod.F90
 
|In routine MODLEV_INTERPOLATE:
 
|In routine MODLEV_INTERPOLATE:
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|}
 
|}
Line 644: Line 644:
 
=== HEMCO/Extensions directory ===
 
=== HEMCO/Extensions directory ===
  
−
The following modifications for MERRA2 were made in the <tt>HEMCO/Extensions</tt> directory:
+
The following modifications for MERRA-2 were made in the <tt>HEMCO/Extensions</tt> directory:
  
 
{| border=1 cellspacing=0 cellpadding=5  
 
{| border=1 cellspacing=0 cellpadding=5  
Line 654: Line 654:
 
|hcox_ch4wetland_mod.F90
 
|hcox_ch4wetland_mod.F90
 
|In routine WETLAND_EMIS:
 
|In routine WETLAND_EMIS:
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|hcox_dustdead_mod.F
 
|hcox_dustdead_mod.F
 
|In routine HCOX_DUSTDEAD_GETTUN:
 
|In routine HCOX_DUSTDEAD_GETTUN:
−
*Add placeholder values of <tt>FLX_MSS_FDG_FCT = -999</tt> for the MERRA2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
+
*Add placeholder values of <tt>FLX_MSS_FDG_FCT = -999</tt> for the MERRA-2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
  
Line 665: Line 665:
 
|hcox_lightnox_mod.F
 
|hcox_lightnox_mod.F
 
|In routine GET_OTD_LIS_SCALE:
 
|In routine GET_OTD_LIS_SCALE:
−
*Add placeholder values of <tt>ANN_AVG_FLASHRATE</tt> for the MERRA2 0.5&deg; x 0.625&deg; grids.
+
*Add placeholder values of <tt>ANN_AVG_FLASHRATE</tt> for the MERRA-2 0.5&deg; x 0.625&deg; grids.
−
*Add placeholder values of <tt>BETA</tt> for the MERRA2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
+
*Add placeholder values of <tt>BETA</tt> for the MERRA-2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
  
Line 672: Line 672:
 
|hcox_megan_mod.F
 
|hcox_megan_mod.F
 
|In routine GET_GAMMA_SM:
 
|In routine GET_GAMMA_SM:
−
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
+
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )</tt>
  
 
|-valign="top"
 
|-valign="top"
 
|hcox_tomas_dustdead_mod.F
 
|hcox_tomas_dustdead_mod.F
 
|In routine HCOX_TOMAS_DUSTDEAD_GETTUN:
 
|In routine HCOX_TOMAS_DUSTDEAD_GETTUN:
−
*Add placeholder values of <tt>FLX_MSS_FDG_FCT = -999</tt> for the MERRA2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
+
*Add placeholder values of <tt>FLX_MSS_FDG_FCT = -999</tt> for the MERRA-2 2&deg; x 2.5&deg; and 4&deg; x 5&deg; grids.
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
 
**<span style="color:red">We will add the correct values once we can run simulations with at least a year of met data.</span>
  

Revision as of 17:45, 7 March 2016

Overview

MERRA-2 is the newest reanalysis meteorological data product from NASA/GMAO. It is created with the NASA/GMAO GEOS Data Assimilation System (aka GEOS-DAS), version 5.12.4. Overall, the structure of MERRA-2 is very similar to the GMAO "forward processing" data product, which we refer to as GEOS-FP. Therefore, within GEOS-Chem we can (for the most part) treat MERRA-2 in the same way as we do for the GEOS_FP.

For more information about MERRA-2, please see these resources:

Comparing MERRA-2 to other GMAO met data products

The table below compares many features of MERRA-2 with other GMAO met data products:

Feature MERRA-2 GEOS-FP MERRA GEOS-5
Native vertical grid
  • 0.5° lat x 0.625° lon
  • 0.25° lat x 0.3125° lon
  • 0.5° lat x 0.667° lon
    • (surface fields)
  • 1° lat x 1.25° lon
    • (most 3D fields)
  • 1.25° x 1.25° lon
    • (moist quantities)
  • 0.5° lat x 0.667° lon
Native horizontal grid
  • 72 hybrid levels
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
Time-invariant fields
  • FRLAKE
  • FRLAND
  • FRLANDIC(E)
  • FROCEAN
  • PHIS
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
Time archiving: surface fields
  • A1 (1-hr time averaged)
  • Same as MERRA-2
  • Same as MERRA-2
  • A3 (6-hr time average)
Time archiving: 3D fields
  • A3 (3-hr time averaged)
  • I3 (3-hr instantaneous)
  • Same as MERRA-2
  • Same as MERRA-2
  • A3 (3-hr time average)
  • I6 (6-hour instantaneous)
  • A6 (6-hr time average) and
  • I6 (6-hr instantaneous)
Timestamps
Precipitation fields
  • DQRCU, DQRLSAN,
  • PFICU, PFILSAN,
  • PFLCU, PFLLSAN,
  • REEVAPCN, REEVAPLSAN
  • Same as MERRA-2
  • Same as MERRA-2
  • DQIDTMST
  • DQLDTMST
  • DQVDTMST
  • MOISTQ = DQIDTMST + DQLDTMST + DQVDTMST
Temperature
  • T [K]
  • I3 (3-hr instantaneous)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • A3 (6-hr time average)
  • Same as MERRA-2
  • A6 (6-hr time average)
Relative humidity
  • RH [1]
  • A3 (3-hr time average)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • I3 (6-hr instantaneous)
  • Same as MERRA-2
  • A6 (6-hr time-averaged)
Specific humidity
  • QV [kg kg-1]
  • I3 (3-hr instantaneous)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • A3 (3-hr time average)
  • Same as MERRA-2
  • A6 (6-hr time-averaged)
Vertical pressure velocity
  • OMEGA [Pa s-1]
  • A3 (3-hr time average)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • I6 (6-hr instantaneous)
  • Same as MERRA-2
  • A6 (6-hr time-averaged)
Ertel potential vorticity
  • PV [K m2 kg-1 s-1]
  • A1 (1-hr time average)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • I6 (6-hr instantaneous)
  • Same as MERRA-2
  • A6 (3-hr time-average)
Snow mass
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
  • SNOMAS [m]
  • A3 (3-hr time average)
Sea level pressure
  • SLP [Pa]
  • A1 (1-hr time average)
  • Converted to hPa when read from disk
  • SLP [hPa]
  • Same as MERRA-2
  • SLP [hPa]
  • Same as MERRA-2
  • SLP [hPa]
  • I6 (3-hr instantaneous)
Surface pressure
  • PS [Pa]
  • I3 (3-hr instantaneous)
  • Converted to hPa when read from disk
  • PS [hPa]
  • I3 (3-hr instantaneous)
  • PS [hPa]
  • I6 (6-hr instantaneous)
  • PS [hPa]
  • I6 (3-hr instantaneous)
Tropopause pressure
  • TROPPT [Pa]
  • A1 (1-hr time average)
  • Converted to hPa when read from disk
  • TROPPT [hPa]
  • Same as MERRA-2
  • TROPPT [hPa]
  • Same as MERRA-2
  • TROPP [hPa]
  • A3 (3-hr time average)
GEOS-Chem convection routine
  • DO_MERRA_CONVECTION
    (in convection_mod.F)
  • Same as MERRA-2
  • Same as MERRA-2
  • NFCLDMX
    (in convection_mod.F)
GEOS-Chem wet deposition routine
  • WETDEP_MERRA
    (wetscav_mod.F)
  • Same as MERRA-2
  • Same as MERRA-2
  • WETDEP
    (wetscav_mod.F)
GEOS-Chem transport routine
  • TPCORE_FVDAS
    (tpcore_fvdas_mod.F90)
  • Same as MERRA-2
  • Same as MERRA-2
  • Same as MERRA-2
File format read by GEOS-Chem
  • netCDF-4
  • netCDF-3
  • binary
  • binary

--Bob Y. (talk) 16:41, 17 August 2015 (UTC)

Timeline for integration into GEOS-Chem

Initial modifications

As of August 2015, we have we have modified GEOS-Chem (as described below) so that it can be driven by the new NASA/GMAO MERRA-2 reanalysis data product. These source code updates were validated with the 1-month benchmark simulation v11-01c and approved on 14 Sept 2015.

Currently, several of the GEOS-Chem specialty simulations are already compatible with MERRA-2. These include:

--Bob Y. (talk) 14:54, 18 August 2015 (UTC)

Modifications for the nested grid simulations

There were several modifications needed to run nested grid simulations with MERRA-2. The source code updates for running MERRA-2 on the 0.5x0.625 nested NA and nested CH grids were included in v11-01e (approved 04 Jan 2016).

--Melissa Sulprizio (talk) 17:13, 14 December 2015 (UTC)

In the pipeline

Making the various "full-chemistry simulations" (i.e. those using the benchmark, UCX, SOA, and tropchem chemistry mechanisms) compatible with MERRA-2 will take longer. These "full-chemistry" simulations use emissions (e.g. lightning, dust) that have scale factors that must be tuned specifically for each met field product. As of February 2016, the GCST is working on computing the dust and lightning scale factors using MERRA-2 met fields for 2009–2014. This update is slated for inclusion in v11-01f.

When the entire MERRA-2 coverage period (1980–present) has been processed, the lightning and dust scale factors for MERRA-2 will be adjusted as needed.

--Melissa Sulprizio (talk) 21:08, 5 February 2016 (UTC)

Required coding changes in GEOS-Chem

As noted in the section above, the similarities between MERRA-2 and GEOS-FP (especially of the vertical grids) means that in most cases we can just treat MERRA-2 in the same way as for GEOS-FP. In many areas of the code, the coding changes are straightforward and simply involve an extension of C-preprocessor statements such as: 

#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )

to 

#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In other areas of GEOS-Chem the changes are more involved. Below we provide a description of the areas of GEOS-Chem that were modified for MERRA-2:

Top-level directory

The following modifications for MERRA-2 were made in the root GEOS-Chem directory:

File Modifications made
Makefile_header.mk
  • If MET=merra2 or MET=merra-2 (case-insensitive), then activate the MERRA-2 C-preprocessor switch
    • i.e. Add -DMERRA-2 to the Makefile variable USER_DEFS.
  • If GRID=05x0625 is added, then activate the GRID05x0625 C-preprocessor switch
    • i.e. Add -DGRID05x0625 to the Makefile variable USER_DEFS.

--Bob Y. (talk) 18:28, 12 August 2015 (UTC)

Headers directory

The following modifications for MERRA-2 were made in the Headers/ directory:

File Modifications made
CMN_SIZE_mod.F
  • Added size parameters for GEOS-FP grids at 4° x 5°, 2° x 2.5°, and 0.25° x 0.3125° resolution
gigc_input_opt_mod.F90
  • Add MERRA-2_DIR to the OptInput derived type
  • Set Input_Opt%MERRA-2_DIR = './' in routine Init_GIGC_Input_Opt
gigc_state_met_mod.F90 Multiple instances:
  • Now use: #if defined( GEOS_FP ) || defined( MERRA ) || defined( MERRA-2 )

--Bob Y. (talk) 18:28, 12 August 2015 (UTC)

GeosUtil directory

The following modifications for MERRA-2 were made in the GeosUtil/ directory:

File Modifications made
bpch2_mod.F In routine GET_MODELNAME:
  • Add MERRA-2_47L and MERRA-2 modelnames to the #if block

In routine GET_NAME_EXT:

  • Return grid name merra2 for MERRA-2 fields

In routine GET_NAME_EXT_2D:

  • Now use #if defined( MERRA ) || defined( MERRA-2 )

In routine GET_RES_EXT:

  • Return resolution string <tt>05x0625 for 0.5° x 0.625° grids
pressure_mod.F In routines GET_PEDGE and GET_PEDGE_FULLGRID:
  • Compute PEDGE for MERRA-2 in the same way as for GEOS-5, MERRA, and GEOS-FP

In routine INIT_PRESSURE:

  • Initialize Ap and Bp for MERRA-2 in the same way as for GEOS-5, MERRA, and GEOS-FP
time_mod.F In routine GET_A1_TIME:
  • Compute the DATE array for MERRA-2 the same way as is done for MERRA and GEOS-FP
transfer_mod.F In routine INIT_TRANSFER:
  • Set L_COPY = 36 for MERRA-2
  • Changed code to #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In several routines:

  • Changed code to #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

--Bob Y. (talk) 20:33, 12 August 2015 (UTC)

GeosCore directory

The following modifications for MERRA-2 were made in the GeosCore/ directory:

File Modifications made
calcrate.F Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
carbon_mod.F Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
cldice_HbrHOBr_mod.F Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
convection_mod.F In routine DO_CONVECTION:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routine DO_MERRA_CONVECTION:

  • Changed code to #if defined( GEOS_FP ) || defined( MERRA-2 ) where we set PFICU and PFLCU
dao_mod.F In routine COPY_I6_FIELDS:
  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA-2 )

In routine INTERP:

  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA-2 )
depo_mercury_mod.F In routine ADD_Hg2_SNOWPACK
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
dao_mod.F In routine COPY_I6_FIELDS:
  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA-2 )

In routine INTERP:

  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA-2 )
diag3.F Multiple instances:
  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA-2 ), etc.
dust_dead_mod.F In routine DST_MBL:
  • For GEOS-FP, add a new value for parameter FLX_MSS_FDG_FCT. The scale factor ensures that we get the same dust totals (w/in roundoff error) as for GEOS-5.
fast_jx_mod.F In routine FAST_JX:
  • Do cloud overlapping for GEOS-FP in the same way as for GEOS-5 and MERRA.
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
gamap_mod.F In routine INIT_TRACERINFO:
  • Changed code to: #elif defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )
global_ch4_mod.F In routines WETLAND_EMIS and READ_COPROD:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )
input_mod.F In routine READ_SIMULATION_MENU:
  • Now read value for Input_Opt%MERRA-2_DIR from input.geos
  • Also set Input_Opt%RES_DIR accordingly for 0.5° x 0.625° nested grids
  • Set LUNZIP=.FALSE. for MERRA-2 met

In routine READ_CONVECTION_MENU:

  • Change #if statement to allow non-local PBL mixing for MERRA-2 met data

In routine VALIDATE_DIRECTORIES:

  • Error check MERRA-2_DIR for start & end date
land_mercury_mod.F

In routines LAND_MERCURY_FLUX:

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routines SOILEMIS:

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
  • Extend #if statement for variable SOIL_EMIS_FAC to get the code to compile w/o error.
    • Team Hg will need to supply an updated value later on.
main.F In main.F:
  • Changed code to if defined( GEOS_FP ) || defined( MERRA-2 ) where we define N_DYN_STEPS
  • Changed code to if defined( GEOS_FP ) || defined( MERRA-2 ) where we define Input_Opt%USE_O3_FROM_MET

In included routine READ_INITIAL_MET_FIELDS:

  • Added calls to routines from merra2_read_mod.F90

In included routine READ_MET_FIELDS:

  • Added calls to routines from merra2_read_mod.F90
mercury_mod.F In routine CHEMMERCURY:
  • Add placeholder K_RED_JNO2 parameter for the 0.5° x 0.625° nested grids.
    • For now use the same value as for the 0.5° x 0.666° grid.
    • Team Hg will need to supply an updated value later on.
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
merra2_read_mod.F90
ocean_mercury_mod.F Multiple instances:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
planeflight_mod.F In routine PLANEFLIGHT
  • Now use: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
strat_chem_mod.F90 Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routine DO_SYNOZ:

  • Add placeholder values for 0.5° x 0.625° grids
sulfate_mod.F In routine CHEM_SO2:
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routine INIT_SULFATE:

  • Changed code to: #if !defined( GEOS_5 ) && !defined( MERRA ) && !defined( GEOS_FP ) && !defined( MERRA-2 )

In routine SRCSFC30 (TOMAS-only):

  • Added a placeholder value for TSCALE for the 0.5° x 0.625° grids
tagged_ox_mod.F In routine GET_REGIONAL_POX:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
tpcore_bc_mod.F: Multiple instances:
  • Added MERRA-2 placeholder values for I1_BC_CH, I2_BC_CH, J1_BC_CH, J2_BC_CH
  • Added MERRA-2 placeholder values for I1_BC_EU, I2_BC_EU, J1_BC_EU, J2_BC_EU
  • Added MERRA-2 placeholder values for I1_BC_NA, I2_BC_NA, J1_BC_NA, J2_BC_NA
vdiff_mod.F90 In routine VDIFFDR:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
wetscav_mod.F In routine DO_WETDEP:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routine DO_WASHOUT_ONLY::

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

In routine MAKE_QQ:

  • Changed code to: #defined( GEOS_FP ) || defined( MERRA-2 )

In routine RAINOUT:

  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

--Bob Y. (talk) 18:29, 12 August 2015 (UTC)

HEMCO/Core directory

The following modifications for MERRA-2 were made in the HEMCO/Core directory:

File Modifications made
hco_chartools_mod.F90 At the top of the module:
  • Extend the #ifdef statement to add the parameter DEF_MET = 'merra2'
  • Extend the #ifdef statement to add the parameter DEF_RES = '05x0625'
hco_interp_mod.F90 In routine MODLEV_INTERPOLATE:
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )

--Bob Y. (talk) 18:28, 12 August 2015 (UTC)

HEMCO/Extensions directory

The following modifications for MERRA-2 were made in the HEMCO/Extensions directory:

File Modifications made
hcox_ch4wetland_mod.F90 In routine WETLAND_EMIS:
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
hcox_dustdead_mod.F In routine HCOX_DUSTDEAD_GETTUN:
  • Add placeholder values of FLX_MSS_FDG_FCT = -999 for the MERRA-2 2° x 2.5° and 4° x 5° grids.
    • We will add the correct values once we can run simulations with at least a year of met data.
hcox_lightnox_mod.F In routine GET_OTD_LIS_SCALE:
  • Add placeholder values of ANN_AVG_FLASHRATE for the MERRA-2 0.5° x 0.625° grids.
  • Add placeholder values of BETA for the MERRA-2 2° x 2.5° and 4° x 5° grids.
    • We will add the correct values once we can run simulations with at least a year of met data.
hcox_megan_mod.F In routine GET_GAMMA_SM:
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA-2 )
hcox_tomas_dustdead_mod.F In routine HCOX_TOMAS_DUSTDEAD_GETTUN:
  • Add placeholder values of FLX_MSS_FDG_FCT = -999 for the MERRA-2 2° x 2.5° and 4° x 5° grids.
    • We will add the correct values once we can run simulations with at least a year of met data.

--Bob Y. (talk) 18:53, 12 August 2015 (UTC)

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