521.wrf_r README

Creating New Inputs

There are two different options for creating new inputs:

Creating New Input Set

Creating an input set is not difficult (although it can be quite finicky). You will, however, need to install many libraries and auxiliary programs first.

Installing WRF

I would suggest that you download WRF version 3.6.1 because that is the version that they used to create the inputs for the SPEC CPU 2017 benchmark.

First, follow the instructions from http://www2.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php up until you get to the section on actually running WRS/WRFV3 (this is done by a script).

WPS_GEOG is the folder for all of the general information needed for running the data found online, while you will need to create a folder called DATA to store specific online inputs. You will likely need to download almost all of the files from http://www2.mmm.ucar.edu/wrf/users/download/get_sources_wps_geog.html.

However, please note that the path to geogdatapath MUST be the absolute path.

The script assumes that all of the programs are stored in their own folders as described in the tutorial.

Additionally, you will also need OBSGRID, which is a bit more annoying to install.

Installing OBSGRID

To install OBSGRID, first download the source from http://www2.mmm.ucar.edu/wrf/src/OBSGRID.tar.gz.

Extract the source into the directory OBSGRID that you installed all of the other programs for wrf (in their tutorial, they called it WRF_Build or something similar).

Then, in OBSGRID run ./configure, followed by ./compile >& log.compile.

When running the configuration file, we found that doing the following helped: - Reinstall netcdf using (Only do this after succesfully installing WRF + WPS): ./configure -prefix=$DIR/netcdf -disable-dap -disable-examples -disable-doxygen make make install

- setenv NCARG_ROOT /usr/share
    (or equivalent for your shell)

- In configure.oa, remove -C from the line
    CPP = ...

- In configure.oa, add -lcairo -lfontconfig -lpixman-1 -lfreetype to the line
    NCARG_LIBS = ...

Then, re-run ./compile>& log.compile and it should work.

You have now installed everything necessary for running the script!


Once you have installed everything, download the dataset you want to use from http://www2.mmm.ucar.edu/wrf/OnLineTutorial/DATA/index.html, or from http://www2.mmm.ucar.edu/wrf/users/download/free_data.html, and put it into the directory DATA, in a subdirectory which will be the name of the dataset. There will also need to be an OBSGRID_DATA directory inside of the subdirectory, which should hopefully come with the data.

There are three scripts, one that will do a single basic run, one that will set up pairs of parameters, and one that will exhaustively try all combinations of the given parameters.

For all of the scripts, to run them, execute:

./<scriptName> <startTime> <endTime> <intervalSeconds> <timeStep> <datasetName> <datasetFormat> <destination>


Customizing the Run

You can customize the variables by changing the file options.txt by writing them in the format:

<name> <value>
<name> <value>

The file options.gen.txt is a generated file, and do not change it since it will get overwritten.

Running a created input

To run a generated input, all you need to do is run wrf_r in the inputs folder, all of the parameters are stored in the namelist.input.

Changing Parameters

Some of the most promising varaiables to change are those in the physics options in WRFV3. Of them, the one with the largest effect is mp_physics, which is the micro physics option. We have not tested all of the variables, so there may be others with a greater effect.