Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise

Abstract The transfer of vast amounts of carbon from a deep oceanic reservoir to the atmosphere is considered to be a dominant driver of the deglacial rise in atmospheric CO2. Paleoceanographic reconstructions reveal evidence for the existence of CO2-rich waters in the mid to deep Southern Ocean. Th...

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Autores principales:	Thomas A. Ronge, Matthias Frische, Jan Fietzke, Alyssa L. Stephens, Helen Bostock, Ralf Tiedemann
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/12b5a8cc9a0a4d93944c45c3278007b8
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spelling	oai:doaj.org-article:12b5a8cc9a0a4d93944c45c3278007b82021-11-14T12:17:57ZSouthern Ocean contribution to both steps in deglacial atmospheric CO2 rise10.1038/s41598-021-01657-w2045-2322https://doaj.org/article/12b5a8cc9a0a4d93944c45c3278007b82021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01657-whttps://doaj.org/toc/2045-2322Abstract The transfer of vast amounts of carbon from a deep oceanic reservoir to the atmosphere is considered to be a dominant driver of the deglacial rise in atmospheric CO2. Paleoceanographic reconstructions reveal evidence for the existence of CO2-rich waters in the mid to deep Southern Ocean. These water masses ventilate to the atmosphere south of the Polar Front, releasing CO2 prior to the formation and subduction of intermediate-waters. Changes in the amount of CO2 in the sea water directly affect the oceanic carbon chemistry system. Here we present B/Ca ratios, a proxy for delta carbonate ion concentrations Δ[CO3 2−], and stable isotopes (δ13C) from benthic foraminifera from a sediment core bathed in Antarctic Intermediate Water (AAIW), offshore New Zealand in the Southwest Pacific. We find two transient intervals of rising [CO3 2−] and δ13C that that are consistent with the release of CO2 via the Southern Ocean. These intervals coincide with the two pulses in rising atmospheric CO2 at ~ 17.5–14.3 ka and 12.9–11.1 ka. Our results lend support for the release of sequestered CO2 from the deep ocean to surface and atmospheric reservoirs during the last deglaciation, although further work is required to pin down the detailed carbon transfer pathways.Thomas A. RongeMatthias FrischeJan FietzkeAlyssa L. StephensHelen BostockRalf TiedemannNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Thomas A. Ronge Matthias Frische Jan Fietzke Alyssa L. Stephens Helen Bostock Ralf Tiedemann Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
description	Abstract The transfer of vast amounts of carbon from a deep oceanic reservoir to the atmosphere is considered to be a dominant driver of the deglacial rise in atmospheric CO2. Paleoceanographic reconstructions reveal evidence for the existence of CO2-rich waters in the mid to deep Southern Ocean. These water masses ventilate to the atmosphere south of the Polar Front, releasing CO2 prior to the formation and subduction of intermediate-waters. Changes in the amount of CO2 in the sea water directly affect the oceanic carbon chemistry system. Here we present B/Ca ratios, a proxy for delta carbonate ion concentrations Δ[CO3 2−], and stable isotopes (δ13C) from benthic foraminifera from a sediment core bathed in Antarctic Intermediate Water (AAIW), offshore New Zealand in the Southwest Pacific. We find two transient intervals of rising [CO3 2−] and δ13C that that are consistent with the release of CO2 via the Southern Ocean. These intervals coincide with the two pulses in rising atmospheric CO2 at ~ 17.5–14.3 ka and 12.9–11.1 ka. Our results lend support for the release of sequestered CO2 from the deep ocean to surface and atmospheric reservoirs during the last deglaciation, although further work is required to pin down the detailed carbon transfer pathways.
format	article
author	Thomas A. Ronge Matthias Frische Jan Fietzke Alyssa L. Stephens Helen Bostock Ralf Tiedemann
author_facet	Thomas A. Ronge Matthias Frische Jan Fietzke Alyssa L. Stephens Helen Bostock Ralf Tiedemann
author_sort	Thomas A. Ronge
title	Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
title_short	Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
title_full	Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
title_fullStr	Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
title_full_unstemmed	Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise
title_sort	southern ocean contribution to both steps in deglacial atmospheric co2 rise
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/12b5a8cc9a0a4d93944c45c3278007b8
work_keys_str_mv	AT thomasaronge southernoceancontributiontobothstepsindeglacialatmosphericco2rise AT matthiasfrische southernoceancontributiontobothstepsindeglacialatmosphericco2rise AT janfietzke southernoceancontributiontobothstepsindeglacialatmosphericco2rise AT alyssalstephens southernoceancontributiontobothstepsindeglacialatmosphericco2rise AT helenbostock southernoceancontributiontobothstepsindeglacialatmosphericco2rise AT ralftiedemann southernoceancontributiontobothstepsindeglacialatmosphericco2rise
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Southern Ocean contribution to both steps in deglacial atmospheric CO2 rise

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