Here is an overview of what ISSM can do:
Control methods are crucial in ice sheet modeling, as they provide an invaluable technique to infer non-measurable quantities (such as basal friction for grounded ice, or the rheology for ice shelves) from observations. Here is an example from Pine Island Glacier.
The basal drag parameter (on the left) is inferred from the observation by minimizing the misfit between the observed and the modeled velocity field. Here are the results after 0, 1, 5 and 10 iterations.
ISSM is capable of accepting transient forcings. Here is an example of a square ice shelf responding to a saw-tooth surface mass balance forcing (black) over a period of 2000 years.