Computer Science
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..54..385k&link_type=abstract
Earth and Planetary Science Letters, Volume 54, Issue 3, p. 385-392.
Computer Science
21
Scientific paper
The mean residence time (τ) of thorium with respect to non-radioactive removal from water was determined as a function of location in three traverses of the New York Bight using both 234Th/238U and 228Th/228Ra. τ correlates well with salinity increasing from about ten days near shore to 70 days at the shelf break. It shows a much weaker correlation with suspended matter concentrations both because suspended matter varies in its scavenging efficiency and because salinity is a longer-term integrator of scavenging potential.
τ's computed from 228Th/228Ra were often higher than those computed from 234Th/238U either because of the detrital matter present as reflected in the 232Th concentrations or because the water parcels had recently arrived from environments of lower scavenging efficiency.
Anomalous isotopic concentrations found in three adjacent samples can best be explained as the result of an episodic release of 228Ra from bottom sediments at a rate 200 times the normal one.
Kaufman Archie
Li Yuan-Hui
Turekian Karl K.
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