Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter

Abstract The dynamics of a large stock of organic matter contained in deep sediments of marginal seas plays pivotal role in global carbon cycle, yet it is poorly constrained. Here, dissolved organic matter (DOM) in sediments was investigated for core sediment up to ~240 meters deep in the East/Japan...

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Autores principales:	Meilian Chen, Ji-Hoon Kim, Jiyoung Choi, Yun Kyung Lee, Jin Hur
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d535a4ac8f8c4855bcab87fc22cef0d7
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spelling	oai:doaj.org-article:d535a4ac8f8c4855bcab87fc22cef0d72021-12-02T12:31:52ZBiological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter10.1038/s41598-017-01759-42045-2322https://doaj.org/article/d535a4ac8f8c4855bcab87fc22cef0d72017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01759-4https://doaj.org/toc/2045-2322Abstract The dynamics of a large stock of organic matter contained in deep sediments of marginal seas plays pivotal role in global carbon cycle, yet it is poorly constrained. Here, dissolved organic matter (DOM) in sediments was investigated for core sediment up to ~240 meters deep in the East/Japan Sea. The upper downcore profile (≤118 mbsf, or meters below seafloor) at a non-chimney site (U1) featured the exponential production of dissolved organic carbon (DOC) and optically active DOM with time in the pore water above sulfate-methane-transition-zone (SMTZ), concurrent with the increases of nutrients and alkalinity, and the reduction of sulfate. Such depth profiles signify a biological pathway of the DOM production during the early diagenesis of particulate organic matter presumably dominated by sulfate reduction. Below the SMTZ, an insolation-paced oscillation of DOM in a ~405-Kyr cycle of orbital eccentricity was observed at site U1, implying astronomically paced paleoproductivity stimulated by light availability. Furthermore, DOM dynamics of the deep sediments were likely governed by intensive humification as revealed by the less pronounced protein-like fluorescence and the lower H/C and O/C ratios below SMTZ among 15,281 formulas identified. Our findings here provide novel insights into organic matter dynamics in deep sediments.Meilian ChenJi-Hoon KimJiyoung ChoiYun Kyung LeeJin HurNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Meilian Chen Ji-Hoon Kim Jiyoung Choi Yun Kyung Lee Jin Hur Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
description	Abstract The dynamics of a large stock of organic matter contained in deep sediments of marginal seas plays pivotal role in global carbon cycle, yet it is poorly constrained. Here, dissolved organic matter (DOM) in sediments was investigated for core sediment up to ~240 meters deep in the East/Japan Sea. The upper downcore profile (≤118 mbsf, or meters below seafloor) at a non-chimney site (U1) featured the exponential production of dissolved organic carbon (DOC) and optically active DOM with time in the pore water above sulfate-methane-transition-zone (SMTZ), concurrent with the increases of nutrients and alkalinity, and the reduction of sulfate. Such depth profiles signify a biological pathway of the DOM production during the early diagenesis of particulate organic matter presumably dominated by sulfate reduction. Below the SMTZ, an insolation-paced oscillation of DOM in a ~405-Kyr cycle of orbital eccentricity was observed at site U1, implying astronomically paced paleoproductivity stimulated by light availability. Furthermore, DOM dynamics of the deep sediments were likely governed by intensive humification as revealed by the less pronounced protein-like fluorescence and the lower H/C and O/C ratios below SMTZ among 15,281 formulas identified. Our findings here provide novel insights into organic matter dynamics in deep sediments.
format	article
author	Meilian Chen Ji-Hoon Kim Jiyoung Choi Yun Kyung Lee Jin Hur
author_facet	Meilian Chen Ji-Hoon Kim Jiyoung Choi Yun Kyung Lee Jin Hur
author_sort	Meilian Chen
title	Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
title_short	Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
title_full	Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
title_fullStr	Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
title_full_unstemmed	Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
title_sort	biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d535a4ac8f8c4855bcab87fc22cef0d7
work_keys_str_mv	AT meilianchen biologicalearlydiagenesisandinsolationpacedpaleoproductivitysignifiedindeepcoresedimentorganicmatter AT jihoonkim biologicalearlydiagenesisandinsolationpacedpaleoproductivitysignifiedindeepcoresedimentorganicmatter AT jiyoungchoi biologicalearlydiagenesisandinsolationpacedpaleoproductivitysignifiedindeepcoresedimentorganicmatter AT yunkyunglee biologicalearlydiagenesisandinsolationpacedpaleoproductivitysignifiedindeepcoresedimentorganicmatter AT jinhur biologicalearlydiagenesisandinsolationpacedpaleoproductivitysignifiedindeepcoresedimentorganicmatter
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Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter

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