210Po and 210Pb in zooplankton fecal pellets |
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| Authors: | T M Beasley M Heyraud J J W Higgo R D Cherry S W Fowler |
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| Institution: | (1) International Laboratory of Marine Radioactivity, Musée Océanographique, Principality of Monaco;(2) Physics Department, University of Cape Town, Rondebosch, Cape Town, South Africa;(3) Marine Science Center, Oregon State University, 97365 Newport, Oregon, USA |
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| Abstract: | 210Po and 210Pb concentrations in fecal pellets from the zooplanktonic euphausiid Meganyctiphanes norvegica are reported. The 210Po:210Pb activity ratio is 2.2±0.3, a value in good agreement with that found in suspended particulate matter in surface seawater. Estimates of 210Po and 210Pb removal times from the mixed layer by fecal pellets alone yield values which are of the same order of magnitude as the removal times for these nuclides by all routes. It is suggested that there is a high probability that zooplanktonic fecal pellets play a significant role in the removal of both these nuclides from the surface layers of the ocean. |
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