Th-234 applied to particle removal rates from the surface ocean: A mathematical treatment revisited

Mathematics – Logic

Scientific paper

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Oceanography: Biological And Chemical: Carbon Cycling, Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Oceanography: Biological And Chemical: Sorptive Scavenging

Scientific paper

It has been recognized since the 1950's that radioisotopic disequilibrium between naturally occurring parent-daughter isotope pairs in seawater can provide information on the rate of processes segregating them. In the surface ocean, the U-238: Th-234 parent-daughter pair tends to display measurable disequilibrium that is attributable to the effects of scavenging on particle reactive thorium. A range of approaches has been applied to deriving quantitative information on particle scavenging and sinking rates from U-238:Th-234 measurements. Here, we review the mathematical underpinnings of a very basic conceptual model of the removal process in order to correct a misunderstanding that has arisen in recent literature.

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