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Marine Reservoir Correction in the South of Vietnam Estimated from An Annually-Banded Coral

Published online by Cambridge University Press:  18 July 2016

Phong X Dang ,
Takehiro Mitsuguchi ,
Hiroyuki Kitagawa ,
Yasuyuki Shibata  and
Toshiyuki Kobayashi
Phong X Dang
Affiliation:
Institute of Geography, Vietnam National Center for Natural Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan Japan Society for the Promotion of Science
Takehiro Mitsuguchi
Affiliation:
Japan Society for the Promotion of Science National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Hiroyuki Kitagawa*
Affiliation:
Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
Yasuyuki Shibata
Affiliation:
National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Toshiyuki Kobayashi
Affiliation:
National Institute for Environmental Studies, Tsukuba 305-8506, Japan
*
Corresponding author. Email: kitagawa@ihas.nagoya-u.ac.jp.
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Abstract

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We measured radiocarbon in an annually-banded coral core collected from Con Dao Island, Vietnam, 90 km from the mouth of the Mekong River, and estimated the regional correction of the marine reservoir age (ΔR value). Twelve samples were continuously taken from the annual bands (AD 1949–1960) which were clearly identified under UV light (∼352 nm) as well as by X-radiography. The 14C content of the samples was determined using an accelerator mass spectrometer at the National Institute for Environmental Studies, Tsukuba, Japan. Results provide a Δ14C time series showing a relatively steady value of −48.6 ± 4.6‰ for the period of 1949–1955 and an abrupt increase starting from 1956 that indicates a quick response to the atmospheric testing of nuclear bombs. Using the prebomb 14C data, the ΔR value in the south of Vietnam is estimated to be −74 ± 39 yr.

Information

Type
Part II
Information
Radiocarbon , Volume 46 , Issue 2: Proceedings of the 18th International Radiocarbon Conference (Part 2 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 657 - 660
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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