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Comparison of Oceanic Δ14C Data with Those of GEOSECS: Vertical Profiles in 1973 (GEOSECS) and in 1980 at (30° N, 170° E) in the Northwestern Pacific Ocean

Published online by Cambridge University Press:  18 July 2016

Toshitaka Gamo ,
Yoshio Horibe  and
Hiromi Kobayashi
Toshitaka Gamo
Affiliation:
Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku Tokyo 164, Japan
Yoshio Horibe
Affiliation:
Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku Tokyo 164, Japan
Hiromi Kobayashi
Affiliation:
Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku Tokyo 164, Japan
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Abstract

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The vertical profile of radiocarbon at (30° N, 170° E) measured in 1980 was compared with the GEOSECS data measured in 1973. 14C was extracted from 200L of sea water, converted to C2H2, and analyzed with a gas proportional counter. Our profile and that of GEOSECS were in good agreement below 700m depth without systematic deviation of Δ14C values between both measurements. On the other hand, a Δ14C increase was observed above 700m depth, reflecting the transient addition, in 6.6 years, of bomb 14C to the intermediate layer from the atmosphere.

Type
Research Article
Information
Radiocarbon , Volume 29 , Issue 1 , 1987 , pp. 53 - 56
Copyright
Copyright © The American Journal of Science 

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