25 years of progress in space altimetry Today’s Video of the Day from the European Space Agency comes to us from the Azores, the site of last week’s 25 Years of Progress in Radar Altimetry Symposium.
Satellite altimeters have shown that the volume of the ocean is rising at an average of three millimeters per year, but rate is now very quickly approaching five millimeters per year.
Satellite altimetry is not only being used to monitor sea-level rise, but is also used to measure ocean currents and changes in ice sheet elevation. Altimetry Research is a boutique financial research and publishing firm providing individual investors with unique, unbiased investment recommendations and analytic.
An altimeter measures how high something is. Satellite radar altimeters measure the ocean surface height (sea level) by measuring the time it takes a radar pulse to make a round-trip from the satellite to the sea surface and back. Bathymetry is measurement of the depth of the ocean. In the Space Age, altimetry satellites have been building upon the tide gauge records. Since 1992, four missions have used very similar instruments and have repeated the same orbit every ten days. 25 years of progress in space altimetry as shown above in the video.
By Chrissy Sexton, Earth.com Staff Writer
Video Credit: European Space Agency