INSeaPTION

INSeaPTION aims at co-designing and co-developing, with users, coastal climate services based on state-of-the art sea-level rise, impact and adaptation science. The project will deliver two sets of services: (1) global to regional mean and extreme sea-level projections with their impacts and uncertainties, and (2) local sea-level, coastal impact and adaptation services. As tropical islands are high impact sectors, we select Maldives and French Polynesia as pilot sites for local coastal climate services. Both global and local services address the committed impacts of sea-level rise and large impacts, and adaptation needs, which will be required if polar ice-sheets melt rapidly.

• Different kinds of contexts, e.g. low or high uncertainty aversion, short or long-time horizons, require different kinds of sea‐level rise information to support coastal adaptation decision making,e.g. probabilistic predictions, low-probability-high-impacts (high-end) scenarios, upper and lower bounds.

• Uncertainty intolerant users such as managers of critical coastal infrastructures require high‐end and low‐end sea‐level rise scenariosproduced for different levels of uncertainty intolerance.

• Long‐term decisions such as planning for future improvements in estuarine barriers or developing new coastal zones can be improved through learning scenarios estimating what will be learned about sea‐level rise in the future.INSeaPTION delivers here sea-level projections with quantified uncertainties, allowing to understand which future research and observations can deliver more precise sea-level projections in the coming decades.