search

talbrecht / pism_pik

merge pik modification to stable version of pism v0.7 to v1.1
GNU General Public License v3.0
2 stars 3 forks source link

ocean depth for ocean cavity model #11

Open matthiasmengel opened 8 years ago

matthiasmengel commented 8 years ago

Ice shelves have diverse thickness, and the bottom topography below them also varies. At which depth do we then take the ocean temperatures and salinities as input for the cavity model? Do these depths spatially vary and can we diagnose these? Does it then mean, that we need to read in 3d ocean fields (if we want to perfect this)? What would POEM need?

ronjareese commented 7 years ago

For POEM, 2d ocean input fields to PISM are fine. They should represent the temperature and salinity on top of the continental shelf, and, as a first guess, extended at that depth into the open ocean.

ronjareese commented 7 years ago

In order to allow the grounding line to advance up to the continental shelf edge, I think that we should compute the ocean means over the 2d field described above within a 100km (?) belt in front of the ice shelf. This should replace the current way to compute the means over all ocean areas which are above a certain threshold (-continental_shelf_depth, default -800). Because in the latter case, if the grounding line advances to the continental shelf break, we might have no ocean cells to compute the means over. Additionally, the continental shelf is in places deeped than -800m or flatter. What do you think?