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AFP English
  • 1 year ago
How do we know sea levels are rising? VIDEOGRAPHIC
Transcript
00:00Up to the 1990s, sea level was calculated from the shore, using tide gauges, and taking
00:11the median between high and low tide.
00:14Since then, sea levels are also measured from space by satellites using altimeters.
00:20Their radar sends waves to the ground, where they rebound when they meet an obstacle like
00:25the ground or water.
00:27According to the time it takes the wave to leave and return, the distance between the
00:31satellite and the surface can be calculated to within a few centimetres.
00:36Based on the altitude of the satellite, and a reference model for the shape of the earth,
00:41the sea level can be determined.
00:43Due to the melting of glaciers and the expansion of water due to heat, sea level is rising,
00:4923 centimetres since 1880.
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