Normal Mode Analysis for spectra calculation built on top of the xgcm python module.
Documentation is available online at https://fluidnumerics.github.io/xnma
If you'd like to install an experimental version of xnma, you can clone the xnma repository to your workstation and install with pip.
git clone https://github.com/fluidnumerics/xnma ~/xnma
cd ~/xnma
git checkout <branch>
pip install . --user --upgrade
In the above example, you can change <branch> to the desired branch you want to experiment with.