Data in support of the article 'Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice'.

This includes final model outputs from finite-element modelling in ParaView .vtu format, Elmer/Ice solver input files (.sif format) and user solver files in Fortran 90, and some workflow scripts.

For full description of data collection and processing methods please see the associated paper.

Contents: ~/run_outputs/ contains subdirectories for each of RESPONDER, S5, and SAFIRE sites, which are then named in accordance with table S1 in the associated paper.

~/scripts/boundary_conditions/ contains scripts to extract boundary information from .vtu files in a .xyz text files (edge_extractor_shift_v3.m and surface_extractor_shift_v2.m). This is done as the free surface runs use cuboid mesh elements whereas thermomechanical runs use METIS generated meshes. See associated paper for full information.

 ~/scripts/DEMs/ contains scripts to generate geostatistical topography (Conditional_simulations_Sermeq.ipynb) and manipulate data for inclusion in Elmer/Ice model runs (DEM_taper_gauss_from_matv_detrendv3-0.py and npy_to_xyz_simple.m).

 ~/sifs/ contains user solver files to calculate basal sliding under the relationship of Helanow et al. (2021) and basal melting (USF_Sliding.F90 and USF_basal_melt.F90 respectively), mesh generation script for Gmsh and example mesh (8k_4k_lc25.geo and 8k_4k_lc25.msh respectively), DummySolver.F90 to be used when obtaining outputs from Elmer but with not solver specified, enth_output.sif to simply obtain the enthalpy field from specified parameters without conducting a full model run, and NS_b_variable_output.sif to obtain other specified variables without a full model run. NS_a.sif is the first .sif for generating results and is used to give FS.sif (free surface runs) a sensible initial velocity field. NS_b.sif is for the final thermomechanical run calculating temperate ice variation and with a fixed surface. As above, see associated paper for further details.

references:

1. C. Helanow, N. R. Iverson, J. B. Woodard, L. K. Zoet, A slip law for hard-bedded glaciers derived from observed bed topography. Sci. Adv. 7, eabe7798 (2021).