Figure 2.

The relationship between frequency ω and wavenumber k_x plotted as dimensionless wavenumber (Re(k_x)) and decay number (Im(k_x)) as a function of forcing frequency ω for parameters appropriate to Pine Island Glacier (table 1) for the case of basal resistance. A dimensional scale for the decay length D*_L is shown (blue right-hand axis, in kilometres) along with a dimensional scale for the forcing period T*_p (top blue axis on colour bar, in years). The SIA is shown as solid circles and the MSA is displayed with a range of Ω values, where Ω=0.037 is the standard value for PIG (upward pointing triangles). Ω=0.01, diamonds; Ω=0.003, sideways triangles; Ω=0.001, stars. The line on which Re(k_x)=−Im(k_x) is also shown (black dashed line).