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  • 1 Japan Agency for Marine-Earth Science and Technology Mutsu Institute for Oceanography 690 Aza-kitasekine, Oaza-sekine Mutsu 035-0022 Japan
  • | 2 Japan Agency for Marine-Earth Science and Technology Department of Ocean Research 2-15 Natsushimacho Yokosuka 237-0061 Japan
  • | 3 Chinese Academy of Geological Sciences National Research Center for Geoanalysis 26 Bainwanzhuang Avenue, Xicheng District Beijing 100037 P.R. China
  • | 4 National Institute of Radiological Sciences Fundamental Technology Center 4-9-1 Anagawa, Inage-ku Chiba 263-8555 Japan
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The distributions of 210Po and 210Pb in the intermediate layer (400–2000 m) of the northwestern North Pacific were determined to elucidate the export flux of particulate matter. 210Po generally showed depletion relative to 210Pb in the intermediate layer, suggesting that 210Po was scavenged by particles. Because the removal rate constants of 210Po in the western region were higher than those in the eastern region and this trend coincided with that of the particle fluxes in the surface layer, the export production in the surface layer was assumed to influence the particle flux in the intermediate layer of the northwestern North Pacific.