Tidewater Glacier Frontal Ablation Calculation Tool (TG_FACT)

This processing chain will calculate monthly, three-monthly or annual frontal ablation for Greenlandic tidewater glaciers based on the following open source input data:

1. TermPicks Terminus delineations (Goliber and Black, 2021).
2. Satellite image (for manual delineation of fjord walls).
3. Glacier velocity (code will automatically download ITS_LIVE velocities ~15 GB)
4. Two Digital Elevation Models (preferably ArcticDEM and AeroDEM; Porter et al., 2018, Korsgaard et al., 2016)
5. Surface change rate (Khan, 2017)
6. Bedrock Topography (BedMachine v4; Morlighem et al., 2017, 2021).
7. Solid Ice Discharge (Mankoff, 2019)

The resulting dataset contains the following variables:

• tbounds - boundaries of time intervals on which output data defined
• t - midpoint of time intervals on which output data defined
• D - discharge during time intervals [GT/yr]
• TMC - terminus mass change during time intervals [GT/yr]
• FA - frontal ablation during time intervals [GT/yr]
• D0 - discharge masking out interpolated values [GT/yr]
• TMC0 - terminus mass change masking out interpolated values [GT/yr]
• FA0 - frontal ablation masking out interpolated values [GT/yr]
• Error - Maximum error during time interval [GT/yr]

A tutorial on how to run the processing chain is available on GitHub: https://github.com/DominikFahrner/TG_FACT

When using this processing chain, please cite:

Fahrner, D., Slater, D., KC, A., Cenedese, C., Sutherland, D.A., Enderlin, E., de Jong, F., Kjeldsen, K.K., Wood, M., Nienow, P. Nowicki, S., Wagner, T. (2023): A Frontal Ablation Dataset for 49 Tidewater Glaciers in Greenland. 

The complete dataset associated with the publication can be found at https://zenodo.org/records/10076253