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Compound-Specific Radiocarbon Ages of Fatty Acids in Marine Sediments from the Western North Pacific

Published online by Cambridge University Press:  18 July 2016

Masao Uchida ,
Yasuyuki Shibata ,
Kimitaka Kawamura ,
Yuichiro Kumamoto ,
Minoru Yoneda ,
Ken'ichi Ohkushi ,
Naomi Harada ,
Masashi Hirota ,
Hitoshi Mukai  and
Atsushi Tanaka
...Show all authors
Masao Uchida*
Affiliation:
Ocean Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237–0061 Japan National Institute for Environmental Studies, Tsukuba 305–0053 Japan
Yasuyuki Shibata
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0053 Japan
Kimitaka Kawamura
Affiliation:
Institute of Low Temperature Science, Hokkaido University, Sapporo 060–0819, Japan
Yuichiro Kumamoto
Affiliation:
Ocean Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237–0061 Japan
Minoru Yoneda
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0053 Japan
Naomi Harada
Affiliation:
Ocean Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237–0061 Japan
Masashi Hirota
Affiliation:
Ocean Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237–0061 Japan
Hitoshi Mukai
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0053 Japan
Atsushi Tanaka
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0053 Japan
Masashi Kusakabe
Affiliation:
Ocean Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237–0061 Japan
Masatoshi Morita
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0053 Japan
*
corresponding author. Email: uchidama@jamstec.go.jp.
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Abstract

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Compound-specific radiocarbon analysis of five fatty-acid biomarkers was conducted for marine sediments collected from the western North Pacific. The fatty acids (C12 to C34) showed a typical bimodal distribution pattern with two maxima at C16 and C26. Their carbon isotopic compositions ranged from −25.1‰ (C16) to −31.8‰ (C28), suggesting that they derived from terrestrial higher plants and marine organisms. A large variations of 14C ages were found among the fatty acids detected in the same sedimentary horizon of the core, ranging from 530 BP (C18) to 3250 BP (C28). The results of 14C analysis of fatty acids could be divided into two groups, i.e., lower molecular weight (LMW) fatty acids (C16, C18) derived from marine organisms and higher molecular weight (HMW) fatty acids (C24, C26, C28) derived from terrestrial higher plants. The HMW fatty acids showed older ages, ranging from 2550 BP (C24) to 3250 BP (C28), than LMW fatty acids (530 BP [C18] to 1,820 years BP [C16]). On the other hand, bulk-phase total organic matter (TOM) showed the age of 2260 BP that is between those two groups, suggesting that it was likely a mixture of organic matter derived from marine and terrestrial sources. The compound specific 14C ages and δ13C data of sedimentary fatty acids presented here could provide useful information to decipher the fate and transport process of terrestrial organic matter to marine sediments.

Type
II. Our ‘Wet’ Environment
Information
Radiocarbon , Volume 43 , Issue 2B: Proceedings of the 17th International Radiocarbon Conference (Part 2 of 3), Conference Editors: Israel Carmi, Elisabetta Boaretto , 2001 , pp. 949 - 956
Copyright
Copyright © 2001 by the Arizona Board of Regents on behalf of the University of Arizona 

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