Sediment alkaline-extracted organic matter (AEOM) fluorescence: An archive of Holocene marine organic matter origins

Carolina P. Funkey*, Daniel J. Conley, Colin A. Stedmon

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Organic matter (OM) is comprised of a complex mixture of substrates, which are difficult to fully characterize. Therefore a range of analytical approaches is applied to provide a better understanding of the dynamics and biogeochemical cycling of aquatic system. One approach is UV–Visible spectroscopy, which includes measurements of spectral absorption and fluorescence of colored and fluorescent fractions of dissolved OM (DOM, CDOM and FDOM). In this study OM fluorescence is characterized by excitation-emission matrix spectroscopy on alkaline extracted DOM from a Baltic Sea sediment core that spanned 8500 years and fluctuating levels of hypoxia. Our results showed that three underlying fluorescence components had strong correlations with carbon, nitrogen content and δ15N. Our results demonstrate that optical properties of extracted OM from sediments reveal information about OM quality and quantity similar to those of biomarkers, which can be a useful additional tool for investigating OM deposition.
Original languageEnglish
JournalScience of the Total Environment
Volume676
Pages (from-to)298-304
ISSN0048-9697
DOIs
Publication statusPublished - 2019

Keywords

  • Organic matter
  • Excitation-emission matrix spectroscopy
  • Fluorescence
  • Baltic Sea
  • Burial
  • Holocene

Cite this

@article{a70ce9cb9aa34f2998d2284e6d76a180,
title = "Sediment alkaline-extracted organic matter (AEOM) fluorescence: An archive of Holocene marine organic matter origins",
abstract = "Organic matter (OM) is comprised of a complex mixture of substrates, which are difficult to fully characterize. Therefore a range of analytical approaches is applied to provide a better understanding of the dynamics and biogeochemical cycling of aquatic system. One approach is UV–Visible spectroscopy, which includes measurements of spectral absorption and fluorescence of colored and fluorescent fractions of dissolved OM (DOM, CDOM and FDOM). In this study OM fluorescence is characterized by excitation-emission matrix spectroscopy on alkaline extracted DOM from a Baltic Sea sediment core that spanned 8500 years and fluctuating levels of hypoxia. Our results showed that three underlying fluorescence components had strong correlations with carbon, nitrogen content and δ15N. Our results demonstrate that optical properties of extracted OM from sediments reveal information about OM quality and quantity similar to those of biomarkers, which can be a useful additional tool for investigating OM deposition.",
keywords = "Organic matter, Excitation-emission matrix spectroscopy, Fluorescence, Baltic Sea, Burial, Holocene",
author = "Funkey, {Carolina P.} and Conley, {Daniel J.} and Stedmon, {Colin A.}",
year = "2019",
doi = "10.1016/j.scitotenv.2019.04.170",
language = "English",
volume = "676",
pages = "298--304",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

Sediment alkaline-extracted organic matter (AEOM) fluorescence: An archive of Holocene marine organic matter origins. / Funkey, Carolina P.; Conley, Daniel J.; Stedmon, Colin A.

In: Science of the Total Environment, Vol. 676, 2019, p. 298-304.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Sediment alkaline-extracted organic matter (AEOM) fluorescence: An archive of Holocene marine organic matter origins

AU - Funkey, Carolina P.

AU - Conley, Daniel J.

AU - Stedmon, Colin A.

PY - 2019

Y1 - 2019

N2 - Organic matter (OM) is comprised of a complex mixture of substrates, which are difficult to fully characterize. Therefore a range of analytical approaches is applied to provide a better understanding of the dynamics and biogeochemical cycling of aquatic system. One approach is UV–Visible spectroscopy, which includes measurements of spectral absorption and fluorescence of colored and fluorescent fractions of dissolved OM (DOM, CDOM and FDOM). In this study OM fluorescence is characterized by excitation-emission matrix spectroscopy on alkaline extracted DOM from a Baltic Sea sediment core that spanned 8500 years and fluctuating levels of hypoxia. Our results showed that three underlying fluorescence components had strong correlations with carbon, nitrogen content and δ15N. Our results demonstrate that optical properties of extracted OM from sediments reveal information about OM quality and quantity similar to those of biomarkers, which can be a useful additional tool for investigating OM deposition.

AB - Organic matter (OM) is comprised of a complex mixture of substrates, which are difficult to fully characterize. Therefore a range of analytical approaches is applied to provide a better understanding of the dynamics and biogeochemical cycling of aquatic system. One approach is UV–Visible spectroscopy, which includes measurements of spectral absorption and fluorescence of colored and fluorescent fractions of dissolved OM (DOM, CDOM and FDOM). In this study OM fluorescence is characterized by excitation-emission matrix spectroscopy on alkaline extracted DOM from a Baltic Sea sediment core that spanned 8500 years and fluctuating levels of hypoxia. Our results showed that three underlying fluorescence components had strong correlations with carbon, nitrogen content and δ15N. Our results demonstrate that optical properties of extracted OM from sediments reveal information about OM quality and quantity similar to those of biomarkers, which can be a useful additional tool for investigating OM deposition.

KW - Organic matter

KW - Excitation-emission matrix spectroscopy

KW - Fluorescence

KW - Baltic Sea

KW - Burial

KW - Holocene

U2 - 10.1016/j.scitotenv.2019.04.170

DO - 10.1016/j.scitotenv.2019.04.170

M3 - Journal article

VL - 676

SP - 298

EP - 304

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -