[OANNES Foro] Contribucion de los seres vivos a la mezcla del agua de los oceanos seria sustancial

[Mario Cabrejos]

Nature 
Volume 460 Number 7255 pp 551-658
30 July 2009 

Editor's Summary

Marine animals cause a stir
An all-but forgotten contribution of Sir Charles Darwin - physicist grandson of the Charles Darwin - has resolved a long-standing debate about ocean mixing. He suggested, in 1953, a mechanism that enables swimming animals to contribute significantly to the mixing of water in the ocean. The debate about the biogenic mixing in the oceans today focuses on comparisons between animal wake turbulence and ocean turbulence. 'Darwinian' mixing is different, and occurs when a solid body travelling in a fluid sets a portion of the surrounding fluid into motion so that it propagates along with the body. Kakani Katija and John Dabiri used field measurements of jellyfish swimming in a remote island lake, combined with a new theoretical model, to demonstrate that the contribution of living organisms to ocean mixing via this mechanism is substantial - of the same order of magnitude as winds and tides.

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Oceanography: A fishy mix
Ocean life is in almost constant motion, and such activity must surely stir things up. Innovative investigations into this concept of 'biogenic mixing' show a role for jellyfish and their brethren.

William K. Dewar

doi:10.1038/460581a

Full Text | PDF (667K)

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A viscosity-enhanced mechanism for biogenic ocean mixing
Kakani Katija & John O. Dabiri

doi:10.1038/nature08207

First paragraph | Full Text | PDF (418K) | Supplementary information
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