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The disequilibrium between 210 Po and its grandparent 210 Pb has been proposed as a tracer of the vertical flux of sinking particulate organic matter in the ocean. The mechanism of association between 210 Po and organic matter is, however, still unclear. To investigate this association we measured trace metals, minerals, organic carbon, nitrogen, and the natural radioisotopes...
Systematic discrepancies between concentrations of particulate organic carbon (POC) measured using bottles (small volume) versus in-situ pumps (large volume) have long been of concern to oceanographers. Usually bottle samples yield higher values of POC than pump samples taken concurrently. Several factors, including pressure effects during filtration, particle formation during handling, contamination,...
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