Ppnc is a collection of python scripts that have been used to extract pp fields to cf-netCDF for submission to the CCMI archive.

The code makes extensive use of Iris:

• https://github.com/SciTools/iris

The following python modules are used:

• iris
• numpy

F2PY is used to create the pressureconv modules

• http://cens.ioc.ee/projects/f2py2e/

f2py -c -m pressureconv pressureconv.f90

These scripts are provided in the hope that someone will find them useful. Due to time restrictions, support for using these scripts is not available.

For usage run:

python ppnc.py --help

or

python ppnc_cella.py --help

Edit some of the files under config to fit your particular use case.

• config/global_attrs.py # defines some of the metadata that is written
• config/req_data.py # defines your stashes, conversion factors and units
• config/tweakables.py # defines your fillvalue and pressure levels

An example invocation of ppnc is as follows:

python ppnc.py -j $JID # Model JobID \
               -t "203001-203912" # Temporal Subset \
               -p /path/to/output/files \ 
               -s $STASH # STASH to restrict to \ 
               --pgrid THETA # Pressure Grid \
               -f /path/to/pp/files/*.pp # pp files to use

An example invocation of ppnc_cella is as follows:

python ppnc_cella.py -j $JID # Model JobID \
                     -a /path/to/model/orography # often called qrparm.orog \
                     -l /path/to/model/land-fraction_file # often called qrparm.fracmask \
                     -p /path/to/output/files \ 
                     -f /path/to/pp/files/${JID}a.pm${C}${N}${mon}.pp # Optional single pp-file to use if calculating grid-cell volume

Note that for ppnc_cella.py, a .pp file containing a single time-point should be used if the gridcell volume is required. This file should contain air potential temperature (theta: m01s00i004). This script writes out areacella, orog, sftlf, and "volcella" (if -f is specified) files.

The submit_scripts folder contains some example bash scripts to create and submit jobs on a system running LSF.

This file is part of ppnc.

ppnc Copyright (C) 2015 University of Cambridge

Ppnc is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Ppnc is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with ppnc. If not, see http://www.gnu.org/licenses/.