Physics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..520l&link_type=abstract
Earth and Planetary Science Letters, Volume 49, Issue 2, p. 520-527.
Physics
3
Scientific paper
Recent studies of dissolved and particulate concentrations of trace elements and radionuclides amply demonstrate the importance of particulate transport in the case of several elements. A significant in-situ addition (J-flux) or removal (J-efflux) occurs in the case of a number of elements. However, to date it is not clear how the particulate processes occur and how the particles themselves are transported. Some of the problems are outlined briefly.
It is shown that whereas a substantial flux in the case of some elements is due to transport by consolidated fecal particles, this transport does not generally lead to any substantial in-situ addition to deep waters. Changes in the dissolved concentrations of elements within the oceans occur due to small particles (1-10 μm) which sink stochastically with a mean speed of ~10-3 cm/s. The larger particles sinking at higher Stokes' velocities impact and carry along the small particles. The smaller particles, ~1 μm size are thus transported down rapidly by the larger particles by a piggy-back mechanism. Simple theoretical calculations are consistent with the measured vertical transport rates based on studies of radionuclides.
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