MERRA-2 implementation details: Difference between revisions

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--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:17, 12 August 2015 (UTC)
--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:17, 12 August 2015 (UTC)
=== HEMCO/Core directory ===
The following modifications for MERRA2 were made in the <tt>HEMCO/Core</tt> directory:
{| border=1 cellspacing=0 cellpadding=5
|- bgcolor="#CCCCCC"
!width="175px"|File
!width="800px"|Modifications made
|-valign="top"
|hco_chartools_mod.F90
|At the top of the module:
*Extend the <tt>#ifdef</tt> statement to add the parameter <tt>DEF_MET = 'merra2'</tt>
*Extend the <tt>#ifdef</tt> statement to add the parameter <tt>DEF_RES = '05x0625'</tt>
|-valign="top"
|hco_interp_mod.F90
|In routine MODLEV_INTERPOLATE:
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
|}
=== HEMCO/Extensions directory ===
The following modifications for MERRA2 were made in the <tt>HEMCO/Extensions/tt> directory:
{| border=1 cellspacing=0 cellpadding=5
|- bgcolor="#CCCCCC"
!width="175px"|File
!width="800px"|Modifications made
|-valign="top"
|hco_chartools_mod.F90
|At the top of the module:
*Extend the <tt>#ifdef</tt> statement to add the parameter <tt>DEF_MET = 'merra2'</tt>
*Extend the <tt>#ifdef</tt> statement to add the parameter <tt>DEF_RES = '05x0625'</tt>
|-valign="top"
|hco_interp_mod.F90
|In routine MODLEV_INTERPOLATE:
*Changed code to: <tt>#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )</tt>
|}

Revision as of 18:27, 12 August 2015

File:Page is under construction.jpg

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: 

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

to 

#if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( 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 MERRA2:

Top-level directory

The following modifications for MERRA2 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 MERRA2 C-preprocessor switch
    • i.e. Add -DMERRA2 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) 21:25, 11 August 2015 (UTC)

Headers directory

The following modifications for MERRA2 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 MERRA2_DIR to the OptInput derived type
  • Set Input_Opt%MERRA2_DIR = './' in routine Init_GIGC_Input_Opt
gigc_state_met_mod.F90 Multiple instances:
  • Now use: #if defined( GEOS_FP ) || defined( MERRA ) || defined( MERRA2 )

--Bob Y. (talk) 21:26, 11 August 2015 (UTC)

GeosUtil directory

The following modifications for MERRA2 were made in the GeosUtil/ directory:

File Modifications made
bpch2_mod.F In routine GET_MODELNAME:
  • Add MERRA2_47L and MERRA2 modelnames to the #if block

In routine GET_NAME_EXT:

  • Return grid name merra2 for MERRA2 fields

In routine GET_NAME_EXT_2D:

  • Now use #if defined( MERRA ) || defined( MERRA2 )

In routine GET_RES_EXT:

  • Return resolution string 05x0625 for 0.5° x 0.625° grids
pressure_mod.F In routines GET_PEDGE and GET_PEDGE_FULLGRID:
  • Compute PEDGE for MERRA2 in the same way as for GEOS-5, MERRA, and GEOS-FP

In routine INIT_PRESSURE:

  • Initialize Ap and Bp for MERRA2 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 MERRA2 the same way as is done for MERRA and GEOS-FP
transfer_mod.F In several routines:
  • Changed code to #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

--Bob Y. (talk) 21:40, 11 August 2015 (UTC)

GeosCore directory

The following modifications for MERRA2 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( MERRA2 )
carbon_mod.F Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
cldice_HbrHOBr_mod.F Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
convection_mod.F In routine DO_CONVECTION:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
dao_mod.F In routine COPY_I6_FIELDS:
  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA2 )

In routine INTERP:

  • Changed code to: #if defined( GEOS_FP ) || defined( MERRA2 )
depo_mercury_mod.F In routine ADD_Hg2_SNOWPACK
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
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( MERRA2 )
gamap_mod.F In routine INIT_TRACERINFO:
  • Changed code to: #elif defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP )
merra2_read_mod.F90 *Added this module w/ routines to read GEOS-FP met data (in netCDF format)
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%MERRA2_DIR from input.geos
  • Also set Input_Opt%RES_DIR accordingly for 0.5° x 0.625° nested grids
  • Set LUNZIP=.FALSE. for MERRA2 met

In routine READ_CONVECTION_MENU:

  • Change #if statement to allow non-local PBL mixing for MERRA2 met data

In routine VALIDATE_DIRECTORIES:

  • Error check MERRA2_DIR for start & end date
land_mercury_mod.F

In routines LAND_MERCURY_FLUX:

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

In routines SOILEMIS:

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
  • Extend #if statement for variable SOIL_EMIS_FAC to get the code to compile w/o error.
    (NOTE: Team Hg: you will have to submit a proper value for this later.
main.F
  • Added calls to routines from merra2_read_mod.F
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.
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
ocean_mercury_mod.F Multiple instances:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
planeflight_mod.F In routine PLANEFLIGHT
  • Now use: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )
strat_chem_mod.F90 Multiple instances:
  • Now use: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

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( MERRA2 )

In routine INIT_SULFATE:

  • Changed code to: #if !defined( GEOS_5 ) && !defined( MERRA ) && !defined( GEOS_FP ) && !defined( MERRA2 )

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( MERRA2 )
tpcore_bc_mod.F: Multiple instances:
  • Added MERRA2 placeholder values for I1_BC_CH, I2_BC_CH, J1_BC_CH, J2_BC_CH
  • Added MERRA2 placeholder values for I1_BC_EU, I2_BC_EU, J1_BC_EU, J2_BC_EU
  • Added MERRA2 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( MERRA2 )
wetscav_mod.F In routine DO_WETDEP:
  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

In routine DO_WASHOUT_ONLY::

  • Changed code to: #if defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

In routine MAKE_QQ:

  • Changed code to: #defined( GEOS_FP ) || defined( MERRA2 )

In routine RAINOUT:

  • Changed code to: #if defined( GEOS_5 ) || defined( MERRA ) || defined( GEOS_FP ) || defined( MERRA2 )

--Bob Y. (talk) 18:17, 12 August 2015 (UTC)

HEMCO/Core directory

The following modifications for MERRA2 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( MERRA2 )

HEMCO/Extensions directory

The following modifications for MERRA2 were made in the HEMCO/Extensions/tt> 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( MERRA2 )
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