Global, high-resolution sensitivity study of local sea-level rise to regional ice thickness change inAntarctica and Greenland.

Regional sea-level is highly variable due to short-term processes related to ocean and atmospheric circulation .This makes identification of long-term trends attributable to the contribution of polar ice sheets difficult. Even more difficult is attribution at the local and regional level of sea-level rise due to particular regions of Antarctica and Greenland, which are now known to behave and project into the future very differently. Here, we present results of high-resolution sensitivity studies carried out using the newly developed Ice Sheet System Model SESAW sea-level rise solver, capable of carrying out mesh-based computations of gravitationally consistent sea-level. Combined with the ISSM-AD automatic differentiation capabilities, we are able to compute local sea-level rise sensitivities to ice thickness change in any area in Greenland and Antarctica, at high resolution (10-30 km). The goal is to better understand the main drivers of sea-level rise over decadal time scales, and the influence of mass change througout different regions of Antarctica and Greenland, and ramifications for future projections of sea level that realistically try and capture the impact of changes in polar ice sheets.