The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink
Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Sou...
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ftarchimer:oai:archimer.ifremer.fr:60842 2023-05-15T18:17:20+02:00 The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf 2015-09 application/pdf https://archimer.ifremer.fr/doc/00497/60842/64285.pdf https://archimer.ifremer.fr/doc/00497/60842/64286.pdf https://archimer.ifremer.fr/doc/00497/60842/64294.pdf https://doi.org/10.1038/ncomms9136 https://archimer.ifremer.fr/doc/00497/60842/ eng eng Nature Publishing Group https://archimer.ifremer.fr/doc/00497/60842/64285.pdf https://archimer.ifremer.fr/doc/00497/60842/64286.pdf https://archimer.ifremer.fr/doc/00497/60842/64294.pdf doi:10.1038/ncomms9136 https://archimer.ifremer.fr/doc/00497/60842/ info:eu-repo/semantics/openAccess restricted use Nature Communications (2041-1723) (Nature Publishing Group), 2015-09 , Vol. 6 , N. 8136 , P. 12p. text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1038/ncomms9136 2021-09-23T20:32:46Z Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink. Article in Journal/Newspaper Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Nature Communications 6 1 |
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 |
Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink. |
format |
Article in Journal/Newspaper |
author |
Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf |
spellingShingle |
Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
author_facet |
Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf |
author_sort |
Abelmann, Andrea |
title |
The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
title_short |
The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
title_full |
The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
title_fullStr |
The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
title_full_unstemmed |
The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink |
title_sort |
seasonal sea-ice zone in the glacial southern ocean as a carbon sink |
publisher |
Nature Publishing Group |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00497/60842/64285.pdf https://archimer.ifremer.fr/doc/00497/60842/64286.pdf https://archimer.ifremer.fr/doc/00497/60842/64294.pdf https://doi.org/10.1038/ncomms9136 https://archimer.ifremer.fr/doc/00497/60842/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Nature Communications (2041-1723) (Nature Publishing Group), 2015-09 , Vol. 6 , N. 8136 , P. 12p. |
op_relation |
https://archimer.ifremer.fr/doc/00497/60842/64285.pdf https://archimer.ifremer.fr/doc/00497/60842/64286.pdf https://archimer.ifremer.fr/doc/00497/60842/64294.pdf doi:10.1038/ncomms9136 https://archimer.ifremer.fr/doc/00497/60842/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/ncomms9136 |
container_title |
Nature Communications |
container_volume |
6 |
container_issue |
1 |
_version_ |
1766191479980556288 |