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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| Format: | Article |
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SpringerOpen
2021-04-01
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| Series: | Progress in Earth and Planetary Science |
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| Online Access: | https://doi.org/10.1186/s40645-021-00416-9 |
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| 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 |
| collection | DOAJ |
| 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. |
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| language | English |
| last_indexed | 2024-12-24T00:19:22Z |
| publishDate | 2021-04-01 |
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| series | Progress in Earth and Planetary Science |
| spelling | doaj.art-d7cff53cb1084193907bbb204f8ee9a02022-12-21T17:24:39ZengSpringerOpenProgress in Earth and Planetary Science2197-42842021-04-018111310.1186/s40645-021-00416-9A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern OceanXin Chen0Xiaodong Liu1Da-Cheng Lin2Jianjun Wang3Liqi Chen4Pai-Sen Yu5Linmiao Wang6Zhifang Xiong7Min-Te Chen8Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of ChinaAnhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of ChinaInstitute of Earth Sciences, National Taiwan Ocean UniversityKey Laboratory of Global Change and Marine-Atmospheric Chemistry (GCMAC) of Ministry of Natural Resources (MNR), Third Institute of Oceanography (TIO), MNRKey Laboratory of Global Change and Marine-Atmospheric Chemistry (GCMAC) of Ministry of Natural Resources (MNR), Third Institute of Oceanography (TIO), MNRTaiwan Ocean Research Institute, National Applied Research LaboratoriesKey Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural ResourcesKey Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural ResourcesInstitute of Earth Sciences, National Taiwan Ocean UniversityAbstract 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.https://doi.org/10.1186/s40645-021-00416-9Southern OceanPacific Oceann-alkaneCarbon isotopicSST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ |
| spellingShingle | 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 Progress in Earth and Planetary Science Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ |
| 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_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_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_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 |
| topic | Southern Ocean Pacific Ocean n-alkane Carbon isotopic SST U 37 k $$ {U}_{37}^{\mathrm{k}} $$ |
| url | https://doi.org/10.1186/s40645-021-00416-9 |
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