Computer Science
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..420k&link_type=abstract
Earth and Planetary Science Letters, Volume 32, Issue 2, p. 420-429.
Computer Science
7
Scientific paper
The concentrations of CaCO3 and radioisotopes, 234Th, 230Th, 239Pu, 226Ra and 210Pb have been measured in particles of >1.2 μm collected from ~4000 liters of Pacific waters (33°N-33°S 124°W-170°E) at depths 700-5500 m. The mean ``ash'' concentrations are found to be 5 μg/kg seawater, about 3-4 times lower than that in the surface waters. The particulate concentrations (dpm/kg seawater) of 239Pu shows a peak at 700-1000 m, whereas the particulate concentration of 230Th and 210Pb which are produced in-situ in seawater increases with depth. These results provide an insight into certain aspects of particle dynamics relevant to modification of trace element composition of seawater due to particle transport and sedimentation flux. The alient sfeatures of the results are: (1) The mean settling velocity of particles are in the range of (0.3-2) × 10-3 cm/sec corresponding to a sedimentation rate of 0.1-0.6 cm/103 yr. (2) The rate constant for the adsorption of Th on particles is deduced to be 8 × 10-8 sec-1 assuming a first-order scavenging model.
Craig Harmon
Krishnaswami S.
Lal Devendra
Somayajulu Bhamdipati L. K.
Weiss Ray F.
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