A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean
Abstract 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-a...
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ftdoajarticles:oai:doaj.org/article:d7cff53cb1084193907bbb204f8ee9a0 2023-05-15T18:24:34+02:00 A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean Xin Chen Xiaodong Liu Da-Cheng Lin Jianjun Wang Liqi Chen Pai-Sen Yu Linmiao Wang Zhifang Xiong Min-Te Chen 2021-04-01T00:00:00Z https://doi.org/10.1186/s40645-021-00416-9 https://doaj.org/article/d7cff53cb1084193907bbb204f8ee9a0 EN eng SpringerOpen https://doi.org/10.1186/s40645-021-00416-9 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-021-00416-9 2197-4284 https://doaj.org/article/d7cff53cb1084193907bbb204f8ee9a0 Progress in Earth and Planetary Science, Vol 8, Iss 1, Pp 1-13 (2021) Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ Geography. Anthropology. Recreation G Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1186/s40645-021-00416-9 2022-12-31T15:09:30Z Abstract 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 m 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 to 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 U 37 k $$ {U}_{37}^{\mathrm{k}} $$ index are potentially useful to reconstruct the detailed history of C3/C4 plants and SST change in the higher latitudes of the Southern Ocean. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles New Zealand Pacific Southern Ocean Progress in Earth and Planetary Science 8 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ Geography. Anthropology. Recreation G Geology QE1-996.5 Xin Chen Xiaodong Liu Da-Cheng Lin Jianjun Wang Liqi Chen Pai-Sen Yu Linmiao Wang Zhifang Xiong Min-Te Chen A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
topic_facet |
Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
Abstract 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 m 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 to 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 U 37 k $$ {U}_{37}^{\mathrm{k}} $$ index are potentially useful to reconstruct the detailed history of C3/C4 plants and SST change in the higher latitudes of the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Xin Chen Xiaodong Liu Da-Cheng Lin Jianjun Wang Liqi Chen Pai-Sen Yu Linmiao Wang Zhifang Xiong Min-Te Chen |
author_facet |
Xin Chen Xiaodong Liu Da-Cheng Lin Jianjun Wang Liqi Chen Pai-Sen Yu Linmiao Wang Zhifang Xiong Min-Te Chen |
author_sort |
Xin Chen |
title |
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
title_short |
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
title_full |
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
title_fullStr |
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
title_full_unstemmed |
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean |
title_sort |
potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the pacific sector of the southern ocean |
publisher |
SpringerOpen |
publishDate |
2021 |
url |
https://doi.org/10.1186/s40645-021-00416-9 https://doaj.org/article/d7cff53cb1084193907bbb204f8ee9a0 |
geographic |
New Zealand Pacific Southern Ocean |
geographic_facet |
New Zealand Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Progress in Earth and Planetary Science, Vol 8, Iss 1, Pp 1-13 (2021) |
op_relation |
https://doi.org/10.1186/s40645-021-00416-9 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-021-00416-9 2197-4284 https://doaj.org/article/d7cff53cb1084193907bbb204f8ee9a0 |
op_doi |
https://doi.org/10.1186/s40645-021-00416-9 |
container_title |
Progress in Earth and Planetary Science |
container_volume |
8 |
container_issue |
1 |
_version_ |
1766205253798068224 |