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| Titel |
The fate of Earth’s ocean |
| VerfasserIn |
C. Bounama, S. Franck, W. Bloh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 5, no. 4 ; Nr. 5, no. 4, S.569-576 |
| Datensatznummer |
250002709
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| Publikation (Nr.) |
 copernicus.org/hess-5-569-2001.pdf |
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| Zusammenfassung |
| Questions of how water
arrived on the Earth’s surface, how much water is contained in the Earth
system as a whole, and how much water will be available in
the future in the surface reservoirs are of central importance to our
understanding of the Earth. To answer the question about the
fate of the Earth’s ocean, one has to study the global water cycle under
conditions of internal and external forcing processes. Modern estimates
suggest that the transport of water to the surface is five times smaller than
water movement to the mantle, so that the Earth will lose all
its sea-water in one billion years from now. This straightforward extrapolation
of subduction-zone fluxes into the future seems doubtful. Using
a geophysical modelling approach it was found that only 27% of the modern ocean
will be subducted in one billion years. Internal feedbacks
will not be the cause of the ocean drying out. Instead, the drying up of surface
reservoirs in the future will be due to the increase in
temperature caused by a maturing Sun connected to hydrogen escape to outer
space.
Keywords: Surface water reservoir, water fluxes, regassing, degassing,
global water cycle |
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