Sea Level

Sea level is the average level of the ocean. Changes in sea level can be caused by many different processes that occur over different timescales. Global sea levels are rising due to global heating. Along our coasts postglacial rebound is an important factor for determining local sea-level change.

Articles

Defining Sea Level and Understanding its Causes

For effective coastal management, it is important to understand how sea levels will change in the future.

Future Sea Level Along the Norwegian Coast

Se havnivå provides the official sea-level projections for any place along the Norwegian coast. The projections are adopted from the report on sea level, “Sea Level Change for Norway – Past and Present Observations and Projections to 2100”.

What Happens After 2100?

Depending on our future greenhouse gas emissions, projections of global sea-level rise show an increase or acceleration towards 2100.

Web Tool for Mapping Storm Surge and Sea-Level Rise

The web tool "Se havnivå i kart" visualize present-day storm surge levels and future sea level rise. The data and maps illustrate the potential scale of inundation.

Observed Sea-Level Changes and Their Causes

Understanding the sources of this sea-level rise is important for improving confidence in future projections. The national sea level observing system in Norway is maintained and operated by the Norwegian Mapping Authority.

Current Ice Sheet Changes

Observations from satellite geodesy show that both the Greenland and Antarctic ice sheets are is losing more ice than it is gaining, and are contributing to global sea-level rise.