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== System Requirements ==
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= System Requirements =
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WRF-GC requires a set of compilers & libraries that are compatible with the WRF model & the GEOS-Chem High Performance model.
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WRF-GC requires a set of compilers and libraries that are compatible with the WRF model and the GEOS-Chem High Performance model.
  
 
Recommended system setup (as tested):
 
Recommended system setup (as tested):
  
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- Compiler: Intel 15.
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* Compiler: [https://software.intel.com/en-us/intel-compilers Intel 15]. There is limited support for the PGI and gfortran compilers.
  
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- MPI Library: MVAPich2 Version 2.3 (http://mvapich.cse.ohio-state.edu/downloads/)
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* [http://mvapich.cse.ohio-state.edu/downloads/ MPI Library: MVAPich2 Version 2.3]
  
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- zlib (http://www.zlib.net/)
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* [http://www.zlib.net/ zlib]
  
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- HDF5 1.8 (https://support.hdfgroup.org/HDF5/release/obtainsrc518.html)
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* [https://support.hdfgroup.org/HDF5/release/obtainsrc518.html HDF5 1.8]
  
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- NetCDF-C 4.6.1 (https://www.unidata.ucar.edu/downloads/netcdf/index.jsp)
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* [https://www.unidata.ucar.edu/downloads/netcdf/index.jsp NetCDF-C 4.6.1]
  
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- NetCDF-Fortran 4.4.4
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* NetCDF-Fortran 4.4.4
  
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- JasPer 1.900.29 (https://www.ece.uvic.ca/~frodo/jasper/#download)
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* [https://www.ece.uvic.ca/~frodo/jasper/#download JasPer 1.900.29]
  
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It is recommended to install all libraries in the same location (using the --prefix=/your/directory/here when calling the configure script). For WRF to correctly find those libraries, you need to set the HDF5 & NETCDF environmental variables to point to the directory (which includes the bin, lib, include directories) where those libraries are installed.
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It is recommended that you install all libraries in the same location (using the --prefix=/your/directory/here when calling the configure script).  
  
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Obtain the WRF model and the WPS pre-processing system. Recommended version is WRF v3.9.1.1. Only WRF version 3.9+ is supported as it provides the hybrid sigma-eta vertical grid functionality required by GEOS-Chem. Version 4.0 is supported but requires modifications to the code.
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For WRF to correctly find those libraries, you need to set the HDF5 & NETCDF environmental variables to point to the directory (which includes the bin, lib, include directories) where those libraries are installed.  
  
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Please refer to:
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For example, if you have used /your/directory/here below, you should be able to see bin, lib and include directories under this directory and point the necessary environmental variables to them:
  
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• WRF User’s Guide: http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3.9/users_guide_chap1.htm
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    $ ls /your/directory/here
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    bin  lib  share  include
  
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• Download Page: http://www2.mmm.ucar.edu/wrf/users/downloads.html
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    $ export HDF5="/your/directory/here"
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    $ export NETCDF=$HDF5
  
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Obtain the GEOS-Chem model and WRF-GC interface. After downloading the WRF model, go into the WRF or WRFV3 directory (depending on your WRF version). In the folder where arch, dyn_em, main … folders are located in, use the following command to check-out the WRF-GC source code repository into the “chem” folder:
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You are also recommended to review the [http://wiki.seas.harvard.edu/geos-chem/index.php/Installing_libraries_for_GEOS-Chem GEOS-Chem library installation] guide.
  
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```
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= Installing WRF-GC =
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to be available soon
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```
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As of time of writing, the WRF-GC interface’s bundled version of GEOS-Chem is GEOS-Chem 12.2.0.
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== Installing WRF-GC ==
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After obtaining the WRF and WRF-GC code in the [[Downloading WRF-GC]] step, you will need to set up the compile environment as follows:
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Please refer to the WRF User’s Guide for installation, taking note that:
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• Set the NETCDF, HDF5 environment variables, JASPERLIB and JASPERINC to the respective “lib” and “include” directories, and WRF_EM_CORE to 1, WRF_NMM_CORE to 0, WRF_CHEM to 1.
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• The configure command must include the hybrid grid option: ./configure -hyb
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* Set the environmental variables WRF_EM_CORE = 1, WRF_NMM_CORE = 0, and WRF_CHEM = 1 in your shell.
  
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• Choose the distributed-memory parallel (dmpar) version of WRF, with Intel C & Fortran compilers
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* Configure WRF using the hybrid sigma-eta grid option using the configure script, setting the distributed-memory parallel (dmpar) version of WRF with the Intel C and Fortran compilers. There is limited support for PGI and gfortran compilers, but they are not recommended for this alpha build.
  
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• Before compiling, go into the “chem” subdirectory and install the WRF-GC registry: make install_registry
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* After configuration please navigate to the WRF-GC "chem" directory, and issue the following command: make install_registry. '''This step is critical and must be done manually before compilation.'''
  
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• Compile WRF-GC like WRF-Chem: ./compile em_real
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* Compile WRF-GC using the ./compile em_real command.
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We recommend that you review the [http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3.9/users_guide_chap1.htm WRF User's Guide (v3.9)] for additional installation information.

Latest revision as of 08:28, 4 January 2019

System Requirements

WRF-GC requires a set of compilers and libraries that are compatible with the WRF model and the GEOS-Chem High Performance model.

Recommended system setup (as tested):

  • Compiler: Intel 15. There is limited support for the PGI and gfortran compilers.
  • NetCDF-Fortran 4.4.4

It is recommended that you install all libraries in the same location (using the --prefix=/your/directory/here when calling the configure script).

For WRF to correctly find those libraries, you need to set the HDF5 & NETCDF environmental variables to point to the directory (which includes the bin, lib, include directories) where those libraries are installed.

For example, if you have used /your/directory/here below, you should be able to see bin, lib and include directories under this directory and point the necessary environmental variables to them: 

   $ ls /your/directory/here
   bin  lib  share  include

   $ export HDF5="/your/directory/here"
   $ export NETCDF=$HDF5

You are also recommended to review the GEOS-Chem library installation guide.

Installing WRF-GC

After obtaining the WRF and WRF-GC code in the Downloading WRF-GC step, you will need to set up the compile environment as follows:

  • Set the environmental variables WRF_EM_CORE = 1, WRF_NMM_CORE = 0, and WRF_CHEM = 1 in your shell.
  • Configure WRF using the hybrid sigma-eta grid option using the configure script, setting the distributed-memory parallel (dmpar) version of WRF with the Intel C and Fortran compilers. There is limited support for PGI and gfortran compilers, but they are not recommended for this alpha build.
  • After configuration please navigate to the WRF-GC "chem" directory, and issue the following command: make install_registry. This step is critical and must be done manually before compilation.
  • Compile WRF-GC using the ./compile em_real command.

We recommend that you review the WRF User's Guide (v3.9) for additional installation information.

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