Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica
The Antarctic coastal zone is an area of high primary productivity, particularly within coastal polynyas, where large phytoplankton blooms and drawdown of CO2 occur. Reconstruction of historical primary productivity changes and the associated driving factors could provide baseline insights on the ro...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus GmbH
2021
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Online Access: | https://archimer.ifremer.fr/doc/00729/84134/89065.pdf https://archimer.ifremer.fr/doc/00729/84134/89066.pdf https://archimer.ifremer.fr/doc/00729/84134/89067.pdf https://archimer.ifremer.fr/doc/00729/84134/89068.pdf https://doi.org/10.5194/bg-18-5555-2021 https://archimer.ifremer.fr/doc/00729/84134/ |
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ftarchimer:oai:archimer.ifremer.fr:84134 2023-05-15T13:47:37+02:00 Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica Ashley, Kate E. Crosta, Xavier Etourneau, Johan Campagne, Philippine Gilchrist, Harry Ibraheem, Uthmaan Greene, Sarah E. Schmidt, Sabine Eley, Yvette Massé, Guillaume Bendle, James 2021-10 application/pdf https://archimer.ifremer.fr/doc/00729/84134/89065.pdf https://archimer.ifremer.fr/doc/00729/84134/89066.pdf https://archimer.ifremer.fr/doc/00729/84134/89067.pdf https://archimer.ifremer.fr/doc/00729/84134/89068.pdf https://doi.org/10.5194/bg-18-5555-2021 https://archimer.ifremer.fr/doc/00729/84134/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00729/84134/89065.pdf https://archimer.ifremer.fr/doc/00729/84134/89066.pdf https://archimer.ifremer.fr/doc/00729/84134/89067.pdf https://archimer.ifremer.fr/doc/00729/84134/89068.pdf doi:10.5194/bg-18-5555-2021 https://archimer.ifremer.fr/doc/00729/84134/ info:eu-repo/semantics/openAccess restricted use Biogeosciences (1726-4170) (Copernicus GmbH), 2021-10 , Vol. 18 , N. 19 , P. 5555-5571 text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.5194/bg-18-5555-2021 2022-02-01T23:50:44Z The Antarctic coastal zone is an area of high primary productivity, particularly within coastal polynyas, where large phytoplankton blooms and drawdown of CO2 occur. Reconstruction of historical primary productivity changes and the associated driving factors could provide baseline insights on the role of these areas as sinks for atmospheric CO2, especially in the context of projected changes in coastal Antarctic sea ice. Here we investigate the potential for using carbon isotopes (δ13C) of fatty acids in marine sediments as a proxy for primary productivity. We use a highly resolved sediment core from off the coast of Adélie Land spanning the last ∼ 400 years and monitor changes in the concentrations and δ13C of fatty acids along with other proxy data from the same core. We discuss the different possible drivers of their variability and argue that C24 fatty acid δ13C predominantly reflects phytoplankton productivity in open-water environments, while C18 fatty acid δ13C reflects productivity in the marginal ice zone. These new proxies have implications for better understanding carbon cycle dynamics in the Antarctica coastal zone in future palaeoclimate studies. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic East Antarctica The Antarctic Biogeosciences 18 19 5555 5571 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The Antarctic coastal zone is an area of high primary productivity, particularly within coastal polynyas, where large phytoplankton blooms and drawdown of CO2 occur. Reconstruction of historical primary productivity changes and the associated driving factors could provide baseline insights on the role of these areas as sinks for atmospheric CO2, especially in the context of projected changes in coastal Antarctic sea ice. Here we investigate the potential for using carbon isotopes (δ13C) of fatty acids in marine sediments as a proxy for primary productivity. We use a highly resolved sediment core from off the coast of Adélie Land spanning the last ∼ 400 years and monitor changes in the concentrations and δ13C of fatty acids along with other proxy data from the same core. We discuss the different possible drivers of their variability and argue that C24 fatty acid δ13C predominantly reflects phytoplankton productivity in open-water environments, while C18 fatty acid δ13C reflects productivity in the marginal ice zone. These new proxies have implications for better understanding carbon cycle dynamics in the Antarctica coastal zone in future palaeoclimate studies. |
format |
Article in Journal/Newspaper |
author |
Ashley, Kate E. Crosta, Xavier Etourneau, Johan Campagne, Philippine Gilchrist, Harry Ibraheem, Uthmaan Greene, Sarah E. Schmidt, Sabine Eley, Yvette Massé, Guillaume Bendle, James |
spellingShingle |
Ashley, Kate E. Crosta, Xavier Etourneau, Johan Campagne, Philippine Gilchrist, Harry Ibraheem, Uthmaan Greene, Sarah E. Schmidt, Sabine Eley, Yvette Massé, Guillaume Bendle, James Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
author_facet |
Ashley, Kate E. Crosta, Xavier Etourneau, Johan Campagne, Philippine Gilchrist, Harry Ibraheem, Uthmaan Greene, Sarah E. Schmidt, Sabine Eley, Yvette Massé, Guillaume Bendle, James |
author_sort |
Ashley, Kate E. |
title |
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
title_short |
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
title_full |
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
title_fullStr |
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
title_full_unstemmed |
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica |
title_sort |
exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of adélie land, east antarctica |
publisher |
Copernicus GmbH |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00729/84134/89065.pdf https://archimer.ifremer.fr/doc/00729/84134/89066.pdf https://archimer.ifremer.fr/doc/00729/84134/89067.pdf https://archimer.ifremer.fr/doc/00729/84134/89068.pdf https://doi.org/10.5194/bg-18-5555-2021 https://archimer.ifremer.fr/doc/00729/84134/ |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
op_source |
Biogeosciences (1726-4170) (Copernicus GmbH), 2021-10 , Vol. 18 , N. 19 , P. 5555-5571 |
op_relation |
https://archimer.ifremer.fr/doc/00729/84134/89065.pdf https://archimer.ifremer.fr/doc/00729/84134/89066.pdf https://archimer.ifremer.fr/doc/00729/84134/89067.pdf https://archimer.ifremer.fr/doc/00729/84134/89068.pdf doi:10.5194/bg-18-5555-2021 https://archimer.ifremer.fr/doc/00729/84134/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/bg-18-5555-2021 |
container_title |
Biogeosciences |
container_volume |
18 |
container_issue |
19 |
container_start_page |
5555 |
op_container_end_page |
5571 |
_version_ |
1766247529520824320 |