MERRA-2 implementation details
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Required coding changes in GEOS-Chem
As noted in the section above, the similarities between MERRA and GEOS-FP (especially of the vertical grids) means that in most cases we can just treat MERRA in the same way as for GEOS-5. 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 )
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 MERRA:
Top-level directory
| File | Modifications made |
|---|---|
| Makefile_header.mk |
|
--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 |
|
| gigc_input_opt_mod.F90 |
|
| gigc_state_met_mod.F90 | Multiple instances:
|
--Bob Y. (talk) 21:26, 11 August 2015 (UTC)
GeosUtil directory
The following modifications for GEOS-FP were made in the GeosUtil/ directory:
| File | Modifications made |
|---|---|
| bpch2_mod.F | In routine GET_MODELNAME:
In routine GET_NAME_EXT:
In routine GET_NAME_EXT_2D:
In routine GET_RES_EXT:
|
| pressure_mod.F | In routines GET_PEDGE and GET_PEDGE_FULLGRID:
In routine INIT_PRESSURE:
|
| time_mod.F | In routine GET_A1_TIME:
|
| transfer_mod.F | In several routines:
|
--Bob Y. (talk) 21:40, 11 August 2015 (UTC)
GeosCore directory
The following modifications for GEOS-FP were made in the GeosCore/ directory:
| File | Modifications made |
|---|---|
| calcrate.F | Multiple instances:
|
| carbon_mod.F | Multiple instances:
|
| cldice_HbrHOBr_mod.F | Multiple instances:
|
| convection_mod.F |
In routine DO_CONVECTION:
|
| dao_mod.F |
In routine COPY_I6_FIELDS:
In routine INTERP:
|
| depo_mercury_mod.F |
In routine ADD_Hg2_SNOWPACK
|
| dust_dead_mod.F |
In routine DST_MBL:
|
| fast_jx_mod.F | In routine FAST_JX:
|
| gamap_mod.F |
In routine INIT_TRACERINFO:
|
| geosfp_read_mod.F90 |
|
| global_ch4_mod.F |
In routines WETLAND_EMIS and READ_COPROD:
|
| input_mod.F |
In routine READ_SIMULATION_MENU:
In routine READ_CONVECTION_MENU:
In routine READ_EMISSIONS_MENU:
In routine VALIDATE_DIRECTORIES:
|
| land_mercury_mod.F |
In routines LAND_MERCURY_FLUX:
In routines SOILEMIS:
|
| lightning_nox_mod.F |
In routine LIGHTNING:
In routine GET_OTD_LIS_SCALE:
|
| main.F |
|
| mercury_mod.F |
In routine CHEM_Hg0_Hg2:
|
| ocean_mercury_mod.F |
Multiple instances:
|
| planeflight_mod.F |
In routine PLANEFLIGHT
|
| strat_chem_mod.F90 |
Multiple instances:
|
| sulfate_mod.F |
Multiple instances:
|
| tagged_ox_mod.F | In routine GET_REGIONAL_POX:
|
| tpcore_bc_mod.F: | Multiple instances:
|
| vdiff_mod.F90 | In routine VDIFFDR:
|
| wetscav_mod.F | In routines DO_WETDEP, DO_WASHOUT_ONLY
In routine MAKE_QQ:
In routine RAINOUT:
|
--Bob Y. (talk) 22:13, 11 August 2015 (UTC)
NcdfUtil/perl subdirectory
In this directory, we have added scripts for automatically generating Fortran code with the proper calls from the NcdfUtilities package. We anticipate that this will be a convenience for GEOS-Chem users, as it will relieve some of the drudgery of writing these calls by hand.
| File | Description |
|---|---|
| StrTrim.pm | Perl module used by the ncCode* scripts. Contains routines for stripping withe space from strings. |
| ncCodeDef | Perl script that generates Fortran code to open a netCDF file and define the various dimensions, variables, and attributes. |
| ncCodeWrite | Perl script that will generate Fortran code to write data to a netCDF file. |
| ncCodeRead | Perl script that will generate Fortran code to read data from a netCDF file. |
| nc_definitions.rc | Generic input file used by the ncCode* scripts. You can edit this. |
| definitions_cn.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP CN data. |
| definitions_a1.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP A1 data. |
| definitions_a3cld.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP A3cld data. |
| definitions_a3dyn.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP A3dyn data. |
| definitions_a3mstc.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP A3mstC data. |
| definitions_a3mste.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP A3mstE data. |
| definitions_i3.rc | Customized version of nc_definitions.rc that will generate Fortran code for reading GEOS-FP I3 data. |
--Bob Y. 15:49, 12 May 2014 (EDT)