6. Variables - instructed-glacier-model/igm GitHub Wiki
Whenever this is possible, IGM adopts name convention of PISM. Here is a minimal list of key variables:
| Variable names | Shape | Description | Unit |
|---|---|---|---|
| t | () | Time variable (scalar) | y |
| dt | () | Time step (scalar) | y |
| x,y | (nx) | Coordinates vectors | m |
| thk | (ny) | Ice thickness | m |
| topg | (ny,nx) | Basal topography (or bedrock) | m |
| usurf | (ny,nx) | Surface topography | m |
| smb | (ny,nx) | Surface Mass Balance | m/y ice-eq |
| ubar | (ny,nx) | x- depth-average velocity of ice | m/y |
| vbar | (ny,nx) | y- depth-average velocity of ice | m/y |
| U | (nz,ny,nx) | x-horiz. 3D velocity field of ice | m/y |
| V | (nz,ny,nx) | y-horiz. 3D velocity field of ice | m/y |
| W | (nz,ny,nx) | z-vert. 3D velocity field of ice | m/y |
| arrhenius | (ny,nx) | Arrhenius Factor | MPa^(-3) y^(-1) |
| slidingco | (ny,nx) | Sliding Coefficient | MPa m^(-1/3) y^(-1/3) |
| divflux | (ny,nx) | Divergence of the flux | m/y |
| icemask | (ny,nx) | Mask to restrict the smb comp. | - |
| dtopgdt | (ny,nx) | Erosion rate | m/y |
| xpos,ypos | (nb particles) | x,y position of particles | m |
| rhpos | (nb particles) | rel. pos of particles in ice column | m |
| air_temp | (nt,ny,nx) | seasonal air temperature 2 m above ground | °C |
| precipitation | (nt,ny,nx) | seasonal precipitation (water eq) | kg m^(-2) y^(-1) |