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Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean

Published online by Cambridge University Press:  18 July 2016

Makio C. Honda
Makio C. Honda*
Affiliation:
Japan Marine Science and Technology Center, Ocean Research Department, 2–15 Natsushima, Yokosuka, Kanagawa 237 Japan
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Abstract

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In order to verify sediment trap samples as indicators of upper ocean 14C concentrations, particulate inorganic radiocarbon (PICΔ14C) collected by time-series sediment traps in the Sea of Okhotsk and the Bering Sea was measured by accelerator mass spectrometry (AMS). All of the PICΔ14C measurements were < 0‰, in contrast to GEOSECS 14C data in the upper ocean from the northwestern North Pacific. This difference is attributed to the upwelling of deepwater that contains low Δ14C of dissolved inorganic carbon (DICΔ14C) and to the decrease over time of surface DICΔ14C owing to the decrease of atmospheric Δ14C values. In addition, PICΔ14C values showed significant seasonal variability: PICΔ14C collected in the fall was the greatest (-22‰ on average), whereas PICΔ14C collected in winter showed an average minimum of −48‰. It is likely that this difference was caused by changes in mixed layer thickness. Although some uncertainties remain, further study on PICΔ14C will enable us to estimate seasonal variability in DICΔ14C and air-sea CO2 exchange rate.

Type
14C Cycling and the Oceans
Information
Radiocarbon , Volume 38 , Issue 3 , 1996 , pp. 583 - 595
Copyright
Copyright © the Arizona Board of Regents on behalf of the University of Arizona 

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