Carbon isotope ratios of organic matter in Bering Sea settling particles: Extremely high remineralization of organic carbon derived from diatoms

Saki Yasuda, Tasuku Akagi, Hiroshi Naraoka, Fumio Kitajima, Kozo Takahashi

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Abstract

The carbon isotope ratios of organic carbon in settling particles collected in the highly-diatom-productive Bering Sea were determined. Wet decomposition was employed to oxidize relatively fresh organic matter. The amount of unoxidised organic carbon in the residue following wet decomposition was negligible. The δ13C of organic carbon in the settling particles showed a clear relationship against SiO2/CaCO3 ratio of settling particles: Approximately -26= and -19= at lower and higher SiO2/CaCO3 ratios, respectively. The δ 13C values were largely interpreted in terms of mixing of two major plankton sources. Both δ 13C and compositional data can be explained consistently only by assuming that more than 98% of diatomaceous organic matter decays and that organic matter derived from carbonate-shelled plankton may remain much less remineralized. A greater amount of diatom-derived organic matter is discovered to be trapped with the increase of SiO2/CaCO3 ratio of the settling particles. The ratio of organic carbon to inorganic carbon, known as the rain ratio, therefore, tends to increase proportionally with the SiO2/CaCO3 ratio under an extremely diatom-productive condition.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalGEOCHEMICAL JOURNAL
Volume50
Issue number3
DOIs
Publication statusPublished - Jan 1 2016

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Bering Sea
Carbon Isotopes
particle settling
carbon isotopes
remineralization
carbon isotope ratio
isotope ratios
settling
algae
Organic carbon
Biological materials
diatom
organic carbon
Plankton
organic matter
carbon
plankton
decomposition
Decomposition
Carbonates

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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title = "Carbon isotope ratios of organic matter in Bering Sea settling particles: Extremely high remineralization of organic carbon derived from diatoms",
abstract = "The carbon isotope ratios of organic carbon in settling particles collected in the highly-diatom-productive Bering Sea were determined. Wet decomposition was employed to oxidize relatively fresh organic matter. The amount of unoxidised organic carbon in the residue following wet decomposition was negligible. The δ13C of organic carbon in the settling particles showed a clear relationship against SiO2/CaCO3 ratio of settling particles: Approximately -26= and -19= at lower and higher SiO2/CaCO3 ratios, respectively. The δ 13C values were largely interpreted in terms of mixing of two major plankton sources. Both δ 13C and compositional data can be explained consistently only by assuming that more than 98{\%} of diatomaceous organic matter decays and that organic matter derived from carbonate-shelled plankton may remain much less remineralized. A greater amount of diatom-derived organic matter is discovered to be trapped with the increase of SiO2/CaCO3 ratio of the settling particles. The ratio of organic carbon to inorganic carbon, known as the rain ratio, therefore, tends to increase proportionally with the SiO2/CaCO3 ratio under an extremely diatom-productive condition.",
author = "Saki Yasuda and Tasuku Akagi and Hiroshi Naraoka and Fumio Kitajima and Kozo Takahashi",
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T1 - Carbon isotope ratios of organic matter in Bering Sea settling particles

T2 - Extremely high remineralization of organic carbon derived from diatoms

AU - Yasuda, Saki

AU - Akagi, Tasuku

AU - Naraoka, Hiroshi

AU - Kitajima, Fumio

AU - Takahashi, Kozo

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The carbon isotope ratios of organic carbon in settling particles collected in the highly-diatom-productive Bering Sea were determined. Wet decomposition was employed to oxidize relatively fresh organic matter. The amount of unoxidised organic carbon in the residue following wet decomposition was negligible. The δ13C of organic carbon in the settling particles showed a clear relationship against SiO2/CaCO3 ratio of settling particles: Approximately -26= and -19= at lower and higher SiO2/CaCO3 ratios, respectively. The δ 13C values were largely interpreted in terms of mixing of two major plankton sources. Both δ 13C and compositional data can be explained consistently only by assuming that more than 98% of diatomaceous organic matter decays and that organic matter derived from carbonate-shelled plankton may remain much less remineralized. A greater amount of diatom-derived organic matter is discovered to be trapped with the increase of SiO2/CaCO3 ratio of the settling particles. The ratio of organic carbon to inorganic carbon, known as the rain ratio, therefore, tends to increase proportionally with the SiO2/CaCO3 ratio under an extremely diatom-productive condition.

AB - The carbon isotope ratios of organic carbon in settling particles collected in the highly-diatom-productive Bering Sea were determined. Wet decomposition was employed to oxidize relatively fresh organic matter. The amount of unoxidised organic carbon in the residue following wet decomposition was negligible. The δ13C of organic carbon in the settling particles showed a clear relationship against SiO2/CaCO3 ratio of settling particles: Approximately -26= and -19= at lower and higher SiO2/CaCO3 ratios, respectively. The δ 13C values were largely interpreted in terms of mixing of two major plankton sources. Both δ 13C and compositional data can be explained consistently only by assuming that more than 98% of diatomaceous organic matter decays and that organic matter derived from carbonate-shelled plankton may remain much less remineralized. A greater amount of diatom-derived organic matter is discovered to be trapped with the increase of SiO2/CaCO3 ratio of the settling particles. The ratio of organic carbon to inorganic carbon, known as the rain ratio, therefore, tends to increase proportionally with the SiO2/CaCO3 ratio under an extremely diatom-productive condition.

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