Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction
The occurrence and variable abundance of certain di- and tri-unsaturated C25 highly branched isoprenoid (HBI) biomarkers in Antarctic marine sediments has previously been proposed as a possible proxy measure of paleo sea-ice extent in the Southern Ocean. In the current study, we obtained 47 near-sur...
Published in: | Organic Geochemistry |
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Language: | English |
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2016
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Online Access: | http://hdl.handle.net/10026.1/4926 https://doi.org/10.1016/j.orggeochem.2016.02.011 |
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ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/4926 2024-05-19T07:32:12+00:00 Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction Smik, L Belt, ST Lieser, JL Armand, LK Leventer, A 2016-05 71-80 application/pdf http://hdl.handle.net/10026.1/4926 https://doi.org/10.1016/j.orggeochem.2016.02.011 en eng Elsevier BV ISSN:0146-6380 ISSN:1873-5290 E-ISSN:1873-5290 0146-6380 1873-5290 http://hdl.handle.net/10026.1/4926 doi:10.1016/j.orggeochem.2016.02.011 2017-9-4 Not known Antarctic Sea ice Proxy Highly branched isoprenoid HBI alkenes Diatom journal-article Article 2016 ftunivplympearl https://doi.org/10.1016/j.orggeochem.2016.02.011 2024-05-01T00:07:16Z The occurrence and variable abundance of certain di- and tri-unsaturated C25 highly branched isoprenoid (HBI) biomarkers in Antarctic marine sediments has previously been proposed as a possible proxy measure of paleo sea-ice extent in the Southern Ocean. In the current study, we obtained 47 near-surface (ca. 0-10 m) water samples taken from locations in East Antarctica with different sea ice settings and analysed them for their HBI, sterol and fatty acid content. Sampling locations ranged from the permanently open-ocean zone (POOZ), with no seasonal sea-ice cover, the near-shore summer sea ice zone (SIZ), where sea ice remains long into the summer melt season, and the marginal ice zone (MIZ), located between the POOZ and the SIZ, and with a highly variable latitudinal sea-ice edge throughout the season. A di-unsaturated C25 HBI (diene II) was only identified in surface waters from the MIZ and the SIZ, consistent with a sea-ice diatom origin for this biomarker. In contrast, a tri-unsaturated C25 HBI (triene III) was detected in all samples from the POOZ, the MIZ and the SIZ, and with a stable isotopic composition (δ13C = -35 ± 1.5‰) consistent with a phytoplankton source. The highest concentrations of diene II and triene III were in samples from the SIZ and the MIZ, respectively, thus providing further insights into the sea-ice conditions likely favourable for their production and how their relative abundances (the II/III ratio) in underlying sediments might be better interpreted for paleo sea-ice reconstruction. In this respect, relatively high II/III might be a good indicator of extended (into summer) seasonal sea-ice cover, while lower II/III may provide a better indicator of the MIZ. However, the observation of highly variable II/III within the polynya setting of the SIZ may also have significant impacts on sedimentary values. Distributions of diatom sterols and fatty acids were also variable between the three sampling zones, but these were not as distinctive as those observed for the HBIs. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) Organic Geochemistry 95 71 80 |
institution |
Open Polar |
collection |
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) |
op_collection_id |
ftunivplympearl |
language |
English |
topic |
Antarctic Sea ice Proxy Highly branched isoprenoid HBI alkenes Diatom |
spellingShingle |
Antarctic Sea ice Proxy Highly branched isoprenoid HBI alkenes Diatom Smik, L Belt, ST Lieser, JL Armand, LK Leventer, A Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
topic_facet |
Antarctic Sea ice Proxy Highly branched isoprenoid HBI alkenes Diatom |
description |
The occurrence and variable abundance of certain di- and tri-unsaturated C25 highly branched isoprenoid (HBI) biomarkers in Antarctic marine sediments has previously been proposed as a possible proxy measure of paleo sea-ice extent in the Southern Ocean. In the current study, we obtained 47 near-surface (ca. 0-10 m) water samples taken from locations in East Antarctica with different sea ice settings and analysed them for their HBI, sterol and fatty acid content. Sampling locations ranged from the permanently open-ocean zone (POOZ), with no seasonal sea-ice cover, the near-shore summer sea ice zone (SIZ), where sea ice remains long into the summer melt season, and the marginal ice zone (MIZ), located between the POOZ and the SIZ, and with a highly variable latitudinal sea-ice edge throughout the season. A di-unsaturated C25 HBI (diene II) was only identified in surface waters from the MIZ and the SIZ, consistent with a sea-ice diatom origin for this biomarker. In contrast, a tri-unsaturated C25 HBI (triene III) was detected in all samples from the POOZ, the MIZ and the SIZ, and with a stable isotopic composition (δ13C = -35 ± 1.5‰) consistent with a phytoplankton source. The highest concentrations of diene II and triene III were in samples from the SIZ and the MIZ, respectively, thus providing further insights into the sea-ice conditions likely favourable for their production and how their relative abundances (the II/III ratio) in underlying sediments might be better interpreted for paleo sea-ice reconstruction. In this respect, relatively high II/III might be a good indicator of extended (into summer) seasonal sea-ice cover, while lower II/III may provide a better indicator of the MIZ. However, the observation of highly variable II/III within the polynya setting of the SIZ may also have significant impacts on sedimentary values. Distributions of diatom sterols and fatty acids were also variable between the three sampling zones, but these were not as distinctive as those observed for the HBIs. |
format |
Article in Journal/Newspaper |
author |
Smik, L Belt, ST Lieser, JL Armand, LK Leventer, A |
author_facet |
Smik, L Belt, ST Lieser, JL Armand, LK Leventer, A |
author_sort |
Smik, L |
title |
Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
title_short |
Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
title_full |
Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
title_fullStr |
Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
title_full_unstemmed |
Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction |
title_sort |
distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from east antarctica: further insights for biomarker-based paleo sea-ice reconstruction |
publisher |
Elsevier BV |
publishDate |
2016 |
url |
http://hdl.handle.net/10026.1/4926 https://doi.org/10.1016/j.orggeochem.2016.02.011 |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
ISSN:0146-6380 ISSN:1873-5290 E-ISSN:1873-5290 0146-6380 1873-5290 http://hdl.handle.net/10026.1/4926 doi:10.1016/j.orggeochem.2016.02.011 |
op_rights |
2017-9-4 Not known |
op_doi |
https://doi.org/10.1016/j.orggeochem.2016.02.011 |
container_title |
Organic Geochemistry |
container_volume |
95 |
container_start_page |
71 |
op_container_end_page |
80 |
_version_ |
1799470188705349632 |