This project is currently under active development. Please contact Seyedhamidreza Mojtabavi ([email protected]) for any questions.

Temperature index mass balance with debri covers on the elevation band flowline. Work in process!

• This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement 869304.

At the moment these options are available:

• to compute mass balance with debris on the elevation band flowline (Huss)
• to compute specific mass-balance with debris

Author: Lindsey Nicholson (adapted from Anne Maussion, Atelier les Gros yeux)

This graphic was designed for the paper from Nicholson et al., 2021. It illustrates the processes of debris flux through a mountain glacier.

Rock debris from the surrounding landscape is transported by glacier ice motion, and some glaciers can develop into debris covered glaciers, with a layer of rock rubble covering part of their ablation zone. This debris cover alters the ablation rate of the glacier, and therefore its overall interaction with a forcing climate.

the newest OGGM developer version has to be installed in order that MBdebris works: e.g. do:

$ conda create --name env_mb
$ source activate env_mb
$ git clone  https://github.com/OGGM/oggm.git
$ cd oggm 
$ pip install -e .
$ git clone https://github.com/OGGM/massbalance-debris
$ cd massbalance-debris
$ pip install -e .

Test the installation via pytest while being in the massbalance-sandbox folder:

$ pytest .

The MBsandbox package can be imported in python by

>>> import MBdebris

(please see https://docs.oggm.org/en/stable/practicalities.html#singularity-and-docker-containers)

# All commands in the EOF block run inside of the container
singularity exec /path/to/oggm/image/oggm_20191122.sif bash -s <<EOF
  set -e
  # Setup a fake home dir inside of our workdir, so we don't clutter the
  # actual shared homedir with potentially incompatible stuff
  export HOME="$OGGM_WORKDIR/fake_home"
  mkdir "\$HOME"
  # Create a venv that _does_ use system-site-packages, since everything is
  # already installed on the container. We cannot work on the container
  # itself, as the base system is immutable.
  python3 -m venv --system-site-packages "$OGGM_WORKDIR/oggm_env"
  source "$OGGM_WORKDIR/oggm_env/bin/activate"
  # OPTIONAL: make sure latest pip is installed
  pip install --upgrade pip setuptools
  # OPTIONAL: install massbalance-debris + install another OGGM version (here provided by its git commit hash) 
  pip install "git+https://github.com/OGGM/oggm.git@ce22ceb77f3f6ffc865be65964b568835617db0d"
  pip install "git+https://github.com/OGGM/massbalance-debris"
  # Finally, you can test OGGM with `pytest --pyargs oggm`, or run your script:
YOUR_RUN_SCRIPT_HERE
EOF

• MassBalance_with_Debris.py: debris_to_gdir, elevation_band_flowline_debris and mb_modules
• tests: tests for different functions (Work in process)

• how_to_use_MBdebris.ipynb: shows mb with debri cover for different glaciers (Hintereisferner, Baltoro and Tipra glaciers)
  • plot debris thickness
  • plot debris correction factor
  • plot mass balance as a function of elevation (with and without debris)
  • plot MSB_specific_mb (with and without debris)
  • plot specific MB with reference mass-balance (WGMS)