A changing nitrogen source for phytoplankton in the central Yellow Sea revealed by Compound-Specific Isotope Analysis of amino acids

Title
A changing nitrogen source for phytoplankton in the central Yellow Sea revealed by Compound-Specific Isotope Analysis of amino acids
Author(s)
최현태; 김하련; 최보형; 이기택; Y. Chhikaraishi; 임동일; Y. Takano
KIOST Author(s)
Lim, Dhongil(임동일)
Publication Year
2018-02-16
Abstract
Recently, gradual increase of anthropogenic nitrogen input into the marine environment has been focused
as one of the widespread impact on global ocean. Major components of anthropogenic nitrogen deposition
are usually derived from nitrogen fertilizers and fossil fuels, which have been explosively increased by
massive agriculture system and urbanization.
Nitrogen isotope ratio (δ N) has provided source information of anthropogenic nitrogen from local to
surrounding areas, and even ocean environment. Compound-specific isotope analysis approach has been
developed as an improved tool to trace nitrogen source with independence from baseline variation in the
nitrogen isotope ratio.
In this study, we have measured compound-specific isotope analysis of nitrogen within amino acids (CSIAAAs)
to understand historical record of nitrogen source variation during approximately two centuries from
sediment core samples, where are the sites in the central Yellow Sea. Since 1990s the δ N values of
phenylalanine (δ N ), as an indicator of background nitrogen, showed significantly lower, close to 0‰
than the previous times. Recent depletion of nitrogen isotope ratios may be related with apparently
enhanced atmospheric nitrogen deposition as a new nitrogen source in the central Yellow Sea.
In addition, nitrogen isotope ratios of phytoplankton were determined by using a combination of δ N and
δ N as two types (trophic and source) of amino acids in the present study. We found temporal
variability of nitrogen isotope ratios of phytoplankton recorded in the sediments of central Yellow Sea,
suggesting recent changing nitrogen source through the increased availability of dissolved inorganic
nitrogen during a couple of decades
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23475
Bibliographic Citation
Ocean Science Meeting, pp.1, 2018
Publisher
The Oceanography Society
Type
Conference
Language
English
Publisher
The Oceanography Society
Related Researcher
Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

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