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137Cs concentration in zooplankton and its relation to taxonomic composition in the western North Pacific Ocean
To study the role of zooplankton in the transport of 137Cs in the ocean, zooplankton samples were collected in October 2005 and June 2006 in the western North Pacific Ocean. The peak zooplankton biomass was observed in the surface layer, and gelatinous plankton was more abundant in October 2005 than...
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Published in: | Journal of environmental radioactivity 2008-12, Vol.99 (12), p.1838-1845 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | To study the role of zooplankton in the transport of
137Cs in the ocean, zooplankton samples were collected in October 2005 and June 2006 in the western North Pacific Ocean. The peak zooplankton biomass was observed in the surface layer, and gelatinous plankton was more abundant in October 2005 than in June 2006 reflecting exchange of water masses. The concentrations of
137Cs in zooplankton varied from 11 to 24 mBq kg wet
−1 and were higher in October 2005 than in June 2006. The elevated abundance of gelatinous zooplankton probably led to higher concentration of
137Cs in zooplankton in October 2005. Annual export fluxes of
137Cs by ontogenetic vertical migrant copepods were estimated to be 0.8 and 0.6 mBq m
−2 year
−1 at 200 and 1000 m depths, respectively; this suggested that transport of
137Cs by zooplankton may be no trivial pathway. |
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ISSN: | 0265-931X 1879-1700 |
DOI: | 10.1016/j.jenvrad.2008.08.006 |