Analysing the uncertainties, we have to distinguish between different types of uncertainties. Manning and Petit (2003) in their paper for the IPCC identify five types, which all are relevant for LSL projections:

• Aleatory uncertainties are most severe in terms of vertical land motion and the reference frame's connection to the CM, as well as the oceanographic observations. The incompleteness of the LSL observations both in space and time add additional aleatory uncertainties.
• Epistemic uncertainties enter the picture mainly from the climate modeling side, where large epistemic uncertainties exist, for example, with respect to a potential dynamic and even catastrophic response of the ice sheets to global warming. With respect to the solid Earth's and LSL's response to ice melting, we have very little epistemic uncertainties, since loading on the solid Earth is a well studied and understood phenomenon.