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Seasonal Variation in Sources of Dissolved Organic Carbon in a Lacustrine Environment Revealed by Paired Isotopic Measurements (Δ14C and δ13C)

Published online by Cambridge University Press:  18 July 2016

Fumiko Nara ,
Akio Imai ,
Minoru Yoneda ,
Kazuo Matsushige ,
Kazuhiro Komatsu ,
Takashi Nagai ,
Yasuyuki Shibata  and
Takahiro Watanabe
Fumiko Nara*
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Akio Imai
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Minoru Yoneda
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Kazuo Matsushige
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Kazuhiro Komatsu
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Takashi Nagai
Affiliation:
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan
Yasuyuki Shibata
Affiliation:
National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Takahiro Watanabe
Affiliation:
Center for Chronological Research, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8602, Japan
*
Corresponding author. Email: nara.fumiko@nies.go.jp
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Abstract

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To investigate the sources and cycling of dissolved organic carbon (DOC) in a lacustrine environment, isotopic measurements of 14C and 13C in DOC were carried out for Lake Kasumigaura—which is famous as a very eutrophic and shallow (mean depth 4.0 m) lake in central Japan—and its tributary rivers. Lake and river samples were collected in the spring and autumn (May and September) of 2003. The Δ14C measurements of DOC were performed using the accelerator mass spectrometer at the National Institute for Environmental Studies (NIES-TERRA), Japan. In September, the 14C values of DOC were light (around −200%) and did not differ significantly between lake and river water samples, indicating that DOC in Lake Kasumigaura and its tributary rivers yields older 14C ages than the age expected from the lake-water residence time (average 200 days). This result suggests that terrestrial sources are important contributors to DOC in Lake Kasumigaura. Nevertheless, δ13C values indicated that during spring, DOC in the lake is mainly autochthonous. Thus, sources and cycling of DOC in Lake Kasumigaura may vary seasonally.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 767 - 773
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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