Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments
© 2019 Over the last decade or so, the mono- and di-unsaturated highly branched isoprenoid (HBI) lipids IP 25 (Ice Proxy with 25 carbon atoms) and IPSO 25 (Ice Proxy for the Southern Ocean with 25 carbon atoms) have emerged as useful proxies for sea ice in the Arctic and Antarctic, respectively. A m...
Published in: | Organic Geochemistry |
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Online Access: | http://hdl.handle.net/10026.1/13527 https://doi.org/10.1016/j.orggeochem.2019.02.002 |
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ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/13527 2024-06-09T07:40:42+00:00 Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments Rontani, JF Smik, L Belt, ST 2019-02-08 63-76 application/pdf http://hdl.handle.net/10026.1/13527 https://doi.org/10.1016/j.orggeochem.2019.02.002 en eng Elsevier BV ISSN:0146-6380 0146-6380 http://hdl.handle.net/10026.1/13527 doi:10.1016/j.orggeochem.2019.02.002 2020-2-8 Not known IPSO25 Degradation Autoxidation Arctic and Antarctic sediments Biotic and abiotic interactions IP25 DIP25 journal-article Article 2019 ftunivplympearl https://doi.org/10.1016/j.orggeochem.2019.02.002 2024-05-14T23:44:04Z © 2019 Over the last decade or so, the mono- and di-unsaturated highly branched isoprenoid (HBI) lipids IP 25 (Ice Proxy with 25 carbon atoms) and IPSO 25 (Ice Proxy for the Southern Ocean with 25 carbon atoms) have emerged as useful proxies for sea ice in the Arctic and Antarctic, respectively. A more complete understanding of their respective proxy signatures, however, requires more detailed knowledge of their stability in the water column and in sediments. In the current study, we focused on the autoxidation of IPSO 25 , first by performing laboratory-based oxidation reactions on a purified sample and characterizing products based on detailed mass spectral analysis. We then analysed for the same oxidation products in near-surface sediments retrieved from the Arctic and the Antarctic, and some suspended organic matter from the Antarctic. Our data show that IPSO 25 is susceptible to partial autoxidation within the oxic layers of Arctic and Antarctic sediments, while the same processes appear not to be so important in the water column. Although the number of primary autoxidation reactions identified in sediments was not as large as in laboratory experiments, there was evidence for their subsequent modification by biotic degradation. Quantifying the extent of degradation of IPSO 25 and IP 25 in sediments, and thus the impact of such process on the use of these biomarkers as paleo sea ice proxies, remains challenging at this stage, since most of the primary oxidation products do not accumulate, likely due to secondary biodegradation reactions. Some interesting differences in reactivity were also observed between IPSO 25 and IP 25 present in the same Arctic sediments. This suggests that factors other than environmental control may influence the IPSO 25 /IP 25 ratio (i.e. DIP 25 ) in Arctic sediments. Article in Journal/Newspaper Antarc* Antarctic Arctic Sea ice Southern Ocean PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) Antarctic Arctic Southern Ocean The Antarctic Organic Geochemistry 129 63 76 |
institution |
Open Polar |
collection |
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) |
op_collection_id |
ftunivplympearl |
language |
English |
topic |
IPSO25 Degradation Autoxidation Arctic and Antarctic sediments Biotic and abiotic interactions IP25 DIP25 |
spellingShingle |
IPSO25 Degradation Autoxidation Arctic and Antarctic sediments Biotic and abiotic interactions IP25 DIP25 Rontani, JF Smik, L Belt, ST Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
topic_facet |
IPSO25 Degradation Autoxidation Arctic and Antarctic sediments Biotic and abiotic interactions IP25 DIP25 |
description |
© 2019 Over the last decade or so, the mono- and di-unsaturated highly branched isoprenoid (HBI) lipids IP 25 (Ice Proxy with 25 carbon atoms) and IPSO 25 (Ice Proxy for the Southern Ocean with 25 carbon atoms) have emerged as useful proxies for sea ice in the Arctic and Antarctic, respectively. A more complete understanding of their respective proxy signatures, however, requires more detailed knowledge of their stability in the water column and in sediments. In the current study, we focused on the autoxidation of IPSO 25 , first by performing laboratory-based oxidation reactions on a purified sample and characterizing products based on detailed mass spectral analysis. We then analysed for the same oxidation products in near-surface sediments retrieved from the Arctic and the Antarctic, and some suspended organic matter from the Antarctic. Our data show that IPSO 25 is susceptible to partial autoxidation within the oxic layers of Arctic and Antarctic sediments, while the same processes appear not to be so important in the water column. Although the number of primary autoxidation reactions identified in sediments was not as large as in laboratory experiments, there was evidence for their subsequent modification by biotic degradation. Quantifying the extent of degradation of IPSO 25 and IP 25 in sediments, and thus the impact of such process on the use of these biomarkers as paleo sea ice proxies, remains challenging at this stage, since most of the primary oxidation products do not accumulate, likely due to secondary biodegradation reactions. Some interesting differences in reactivity were also observed between IPSO 25 and IP 25 present in the same Arctic sediments. This suggests that factors other than environmental control may influence the IPSO 25 /IP 25 ratio (i.e. DIP 25 ) in Arctic sediments. |
format |
Article in Journal/Newspaper |
author |
Rontani, JF Smik, L Belt, ST |
author_facet |
Rontani, JF Smik, L Belt, ST |
author_sort |
Rontani, JF |
title |
Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
title_short |
Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
title_full |
Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
title_fullStr |
Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
title_full_unstemmed |
Autoxidation of the sea ice biomarker proxy IPSO 25 in the near-surface oxic layers of Arctic and Antarctic sediments |
title_sort |
autoxidation of the sea ice biomarker proxy ipso 25 in the near-surface oxic layers of arctic and antarctic sediments |
publisher |
Elsevier BV |
publishDate |
2019 |
url |
http://hdl.handle.net/10026.1/13527 https://doi.org/10.1016/j.orggeochem.2019.02.002 |
geographic |
Antarctic Arctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Arctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Arctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Arctic Sea ice Southern Ocean |
op_relation |
ISSN:0146-6380 0146-6380 http://hdl.handle.net/10026.1/13527 doi:10.1016/j.orggeochem.2019.02.002 |
op_rights |
2020-2-8 Not known |
op_doi |
https://doi.org/10.1016/j.orggeochem.2019.02.002 |
container_title |
Organic Geochemistry |
container_volume |
129 |
container_start_page |
63 |
op_container_end_page |
76 |
_version_ |
1801369098542645248 |