havnivåovervåking
Havnivåovervåking is the ongoing process of measuring and recording the height of the ocean's surface. This is crucial for understanding climate change and its impact on coastal areas. Satellites equipped with radar altimeters are the primary tools for global sea-level measurements, providing data across vast ocean expanses. These satellites send out microwave pulses and measure the time it takes for them to return after reflecting off the ocean surface, thus calculating the precise distance. In addition to satellites, tide gauges located along coastlines offer continuous, localized measurements of sea level. These instruments have a long historical record, providing valuable long-term data.
The data collected from havnivåovervåking is used to identify trends in sea-level rise, which is a direct