Select a start year and end year from the date slider below to see a chart of annual Mean Sea Level (MSL) and it's associated annual rate of change. If a end year in the future is selected, i.e. beyond which there is available observed data, then the linear (black line) and polynomial (purple line) trendlines will show an estimate of MSL from the year which the observed data ends up to the year selected by the user.

The mean annual rate of Relative Sea Level (RSL) change for Sydney between and is approximately mm per year with a Standard Error of +/- mm per year.

Corrected for subsidence and Vertical Land Movement (VLM) of +/- mm per year (GPS Solution: JPL14), the mean annual rate of Absolute Sea Level (ASL) change for Sydney between and is approximately mm per year () with a Standard Error of +/- mm per year.

The mean Relative Sea Level acceleration for Sydney between and is approximately mm/year2.

Data represented by the blue line in the above chart is the observed annual Mean Sea Level for the selected period corrected for subsidence. This is given as a height above RLR. The black line is the linear trendline for the selected period and indicates the overall direction of the data. It's gradient is the average annual rate of MSL change and is shown in the legend at the top right hand corner of the chart in the form of the straight line equation 'y = mx + c'. The purple line is the corresponding quadratic or second degree polynomial trendline.

Hover over the blue line to see individual annual MSL values in the tooltip. Hover over the legend at the top of the chart to see each trendline's equation and it's corresponding coefficient of determination R2 value in the tooltip.

Please note that Mean Sea Level predicted from the facility to project the above trendlines into the future are estimates only.

I've created an R Shiny app which fits various degree (1-4) polynomials to the above data and also produces p-Values, R-Squared, F-Statistic and t-statistic error parameters which you can find in the navigation menu at the top of this page.

Station Documentation

Data for 1915 - 2021 retrieved June 2022 from Permanent Service for Mean Sea Level.