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Xin Chen
Corresponding Author
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Investigating organic compounds in marine sediments can potentially unlock a wealth of new information in these climate archives. Here we present pilot study results of organic geochemical features of long-chain n-alkanes and alkenones and individual carbon isotope ratios of long-chain n-alkanes from a newly collected, approximately 8-meter long, located in the far reaches of the Pacific sector of the Southern Ocean. We analyzed a suite of organic compounds in the core. The results show abundant long-chain n-alkanes (C29-C35) with predominant odd-over-even carbon preference, suggesting an origin of terrestrial higher plant waxes via long-range transport of dust, possibly from Australia and New Zealand. The δ13C values of the C31 n-alkane range from -29.4 to -24.8‰, in which the higher δ13C values suggest more contributions from C4 plant waxes. In the analysis, we found that the mid-chain n-alkanes (C23-C25) have a small odd-over-even carbon preference, indicating that they were derived from marine non-diatom pelagic phytoplankton and microalgae and terrestrial sources. Furthermore, the C26 and C28 with lower δ13C values (~ -34‰) indicate an origin from marine chemoautotrophic bacteria. We found that the abundances of tetra-unsaturated alkenones (C37:4) in this Southern Ocean sediment core ranges from 11-37%, perhaps a marker of low sea surface temperature (SST). The results of this study strongly indicate that the δ13C values of long-chain n-alkanes and index are potentially useful to reconstruct the detailed history of C3/C4 plants and SST change in the higher latitudes of the Southern Ocean.
Keywords
Southern Ocean, Pacific Ocean, n-alkane, carbon isotopic, SST, U37k
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CURRENT STATUS: Under Review
Version 2
Posted 06 Jan, 2021
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Review #1 received
Received 14 Feb, 2021
Reviewers invited
Invitations sent on 03 Jan, 2021
Reviewer #1 agreed
On 03 Jan, 2021
Editor assigned
On 20 Dec, 2020
Submission checks complete
On 20 Dec, 2020
Editor invited
On 20 Dec, 2020
Version (no preprint)
Posted 10 Dec, 2020
Editor assigned
On 10 Dec, 2020
Submission checks complete
On 10 Dec, 2020
Editor invited
On 10 Dec, 2020
This version was not preprinted
No comments provided
Review #2 received
Received 06 Oct, 2020
Editorial decision: Major revision
On 06 Oct, 2020
Review #1 received
Received 30 Sep, 2020
Reviewer #2 agreed
On 28 Aug, 2020
Reviewer #1 agreed
On 19 Aug, 2020
Reviewers invited
Invitations sent on 19 Aug, 2020
Editor assigned
On 03 Aug, 2020
Submission checks complete
On 02 Aug, 2020
Editor invited
On 02 Aug, 2020
First submitted
On 30 Jul, 2020
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Subject Areas
Plant Physiology and Morphology
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This preprint is under consideration at Progress in Earth and Planetary Science. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research article
Xin Chen
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 2
Posted 06 Jan, 2021
No community comments so far
Review #1 received
Received 14 Feb, 2021
Reviewers invited
Invitations sent on 03 Jan, 2021
Reviewer #1 agreed
On 03 Jan, 2021
Editor assigned
On 20 Dec, 2020
Submission checks complete
On 20 Dec, 2020
Editor invited
On 20 Dec, 2020
Version (no preprint)
Posted 10 Dec, 2020
Editor assigned
On 10 Dec, 2020
Submission checks complete
On 10 Dec, 2020
Editor invited
On 10 Dec, 2020
This version was not preprinted
No comments provided
Review #2 received
Received 06 Oct, 2020
Editorial decision: Major revision
On 06 Oct, 2020
Review #1 received
Received 30 Sep, 2020
Reviewer #2 agreed
On 28 Aug, 2020
Reviewer #1 agreed
On 19 Aug, 2020
Reviewers invited
Invitations sent on 19 Aug, 2020
Editor assigned
On 03 Aug, 2020
Submission checks complete
On 02 Aug, 2020
Editor invited
On 02 Aug, 2020
First submitted
On 30 Jul, 2020
Subject Areas
Plant Physiology and Morphology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Investigating organic compounds in marine sediments can potentially unlock a wealth of new information in these climate archives. Here we present pilot study results of organic geochemical features of long-chain n-alkanes and alkenones and individual carbon isotope ratios of long-chain n-alkanes from a newly collected, approximately 8-meter long, located in the far reaches of the Pacific sector of the Southern Ocean. We analyzed a suite of organic compounds in the core. The results show abundant long-chain n-alkanes (C29-C35) with predominant odd-over-even carbon preference, suggesting an origin of terrestrial higher plant waxes via long-range transport of dust, possibly from Australia and New Zealand. The δ13C values of the C31 n-alkane range from -29.4 to -24.8‰, in which the higher δ13C values suggest more contributions from C4 plant waxes. In the analysis, we found that the mid-chain n-alkanes (C23-C25) have a small odd-over-even carbon preference, indicating that they were derived from marine non-diatom pelagic phytoplankton and microalgae and terrestrial sources. Furthermore, the C26 and C28 with lower δ13C values (~ -34‰) indicate an origin from marine chemoautotrophic bacteria. We found that the abundances of tetra-unsaturated alkenones (C37:4) in this Southern Ocean sediment core ranges from 11-37%, perhaps a marker of low sea surface temperature (SST). The results of this study strongly indicate that the δ13C values of long-chain n-alkanes and index are potentially useful to reconstruct the detailed history of C3/C4 plants and SST change in the higher latitudes of the Southern Ocean.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
This preprint is available for download as a PDF.
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