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Tracking Ocean Heat With Magnetic Fields

NASA Goddard Space Flight Center

ScienceSpace

At the NASA Image and Video Library

Clips are not offered for this film: NASA's media guidelines set the terms of its reuse themselves, not as a public licence.

About

As Earth warms, much of the extra heat is stored in the planet’s ocean – but monitoring the magnitude of that heat content is a difficult task. A surprising feature of the tides could help, however. Scientists at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, are developing a new way to use satellite observations of magnetic fields to measure heat stored in the ocean. The method depends on several geophysical features of the ocean. Seawater is a good electrical conductor, so as the saltwater sloshes around the ocean basins it causes slight fluctuations in Earth’s magnetic field lines. The ocean flow attempts to drag the field lines along. The resulting magnetic fluctuations are relatively small, but have been detected from an increasing number of events including swell, eddies, tsunamis, and tides. The magnetic fluctuations of the tides depend on the electrical conductivity of the water – and the electrical conductivity of the water depends on its temperature. This new method could be the first to provide global ocean heat measurements, integrated over all depths, using satellite observations.

Archive
NASA Image and Video Library, in NASA
Licence or status
NASA media guidelines, as the NASA Image and Video Library states it.
Credit
NASA Goddard Space Flight Center
Language
English
Country
United States
Subtitles
English
Who can watch
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