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The initiation of a marine ice-sheet instability (MISI) is generallydiscussed from the ocean side of the ice sheet. It has been shown that thereduction in ice-shelf buttressing and softening of the coastal ice candestabilize a marine ice sheet if the bedrock is sloping upward towards theocean. Using a conceptional flow-line geometry, we investigate thepossibility of whether a MISI can be triggered from the direction of the icedivide as opposed to coastal forcing and explore the interaction betweenconnected basins. We find that the initiation of a MISI in one basin caninduce a destabilization in the other. The underlying mechanism of basininteraction is based on dynamic thinning and a consecutive motion of the icedivide which induces a thinning in the adjacent basin and a successiveinitiation of the instability. Our simplified and symmetric topographic setupallows scaling both the geometry and the transition time between bothinstabilities. We find that the ice profile follows a universal shape that isscaled with the horizontal extent of the ice sheet and that the same exponentof 1/2 applies for the scaling relation between central surface elevationand horizontal extent as in the pure shallow ice approximation (Vialovprofile). Altering the central bed elevation, we find that the extent ofgrounding-line retreat in one basin determines the degree of interaction withthe other. Different scenarios of basin interaction are discussed based onour modeling results as well as on a conceptual flux-balance analysis. Weconclude that for the three-dimensional case, the possibility of drainagebasin interaction on timescales on the order of 1 kyr or larger cannot beexcluded and hence needs further investigation

Interaction of marine ice-sheet instabilities in two drainage basins: simple scaling of geometry and transition time