Smith Glacier experiments

This repository consist of several experiments with Fenics_ice over Smith, Pope, and Kohler Glaciers. They are three narrow ∼ 10 km wide interconnected West Antarctic ice streams.

Note: this repository documentation is a work in progress :construction_worker:

The code has been developed to:

1. Create a finite element mesh of the region of interest, where simulations will be carried out.
2. Generate the all input data (crop to the study domain) needed by Fenics_ice.

And to carry out the following experiments with the model:

3. Invert for basal drag and ice stiffness by minimizing the difference between model and observed ice velocities (J^c_mis).
4. Run the eigendecomposition of the Hessian matrix of the model-observations misfit J^c_mis and multiply this, by the inverse of the covariance matrix of the basal drag/ice stiffness.
5. And finally project this covariance on a linearization of the time-dependent ice sheet model (using Automatic Differentiation to generate the linearization) and estimate the growth of a QoI (Quantity of Interest) uncertainty over time (e.g. Ice mass loss).

Repository structure:

• ficetools: inner python module that host various useful functions for the pre-processing stages, handling files and plotting routines.
• scripts: Python and bash scripts to run each data processing stage.
  • prepro_stages: Python scripts to generate the input data cropped to the study region for all the model stages.
  • run_experiments: Bash scrips and .toml configuration files for each run experiment and stage of fenics_ice.
  • plot_stages: An alternative to Paraview to visualize the model input and output data with matplotlib.
  • post_processing: Python scripts to re-grid the Fenics_ice output to a rectangular mesh.
• config.ini: Local configuration file for paths to input and output data.
• setpaths.sh: Global paths to repository and repository directories.

Installation and usage

Check out the repository Wiki for installation and usage.