The SLBC_cci+ dataset is provided as a single data collection that contains the Sea Level Budget (SLB) components from the constrained approach. This dataset is a compilation of time series and regional grids of the following elements of the mean sea level budget and ocean mass budget:

(a) relative sea level;
(b) the thermosteric component of mean sea level, representing the change in ocean density caused by thermal expansion;
(c) sea level changes due to salinity-driven density variations in the ocean;
(d) the mass contribution to mean sea level.

Uncertainties associated with each component were characterized. These uncertainties are provided as variance-covariance matrices, available at a monthly timescale for both global and regional scales. These matrices enable the estimation of uncertainties in trends and acceleration across any timescales.

In the second phase of the project, sea-level budget closure was evaluated using two complementary approaches: (a) an unconstrained approach, in which the sum of the individual contributors is directly compared with the observed relative sea-level change, and (b) a constrained approach based on an inverse method that enforces budget closure while weighting each contributor according to its uncertainty.