East-west distribution of POC fluxes estimated from 234Th in the northern North Pacific in autumn |
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Authors: | Hajime Kawakami Makio C. Honda Kazuhiko Matsumoto Tetsuichi Fujiki Shuichi Watanabe |
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Affiliation: | (1) Department of Geological Sciences, Science Laboratories, South Road, Durham, DH1 3LE, UK;(2) Environment Agency, National Data Unit, Lower Bristol Road, Bath, BS2 9ES, UK;(3) Environment Agency, National Data Centre, Twerton, UK |
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Abstract: | Observations of primary productivity, 234Th, and particulate organic carbon (POC) were made from west to east across the northern North Pacific Ocean (from station K2 to Ocean Station Papa) during September–October 2005. Primary productivities in this region varied longitudinally from approximately 236 to 444 mgC m−2d−1 and clearly indicate the West High East Low (WHEL) trend. We estimated east-west variations in the POC flux from the surface layer (0–100 m) by using 234Th as a tracer. POC fluxes in the western region (44–53 mgC m−2d−1) were higher than those in the eastern region (21–34 mgC m−2d−1). However, the export ratios (e-ratios) ranged from approximately 8% to 16% and did not show the WHEL trend. Contrary to our expectation, no relation between POC flux (or e-ratio) and diatom biomass (or dominance) was apparent in autumn in the northern North Pacific. |
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