Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years

Glacial/interglacial changes in Southern Ocean's air-sea gas exchange have been considered as important mechanisms contributing to the glacial/interglacial variability in atmospheric CO2. Hence, understanding past variability in Southern Ocean intermediate to deep water chemistry and circulatio...

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Published in:Paleoceanography
Main Authors: Ronge, Thomas A., Steph, Silke, Tiedemann, Ralf, Prange, Matthias, Merkel, Ute, Nuernberg, Dirk, Kuhn, Gerhard
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2015
Subjects:
Online Access:https://archimer.ifremer.fr/doc/00294/40568/39465.pdf
https://archimer.ifremer.fr/doc/00294/40568/39466.docx
https://archimer.ifremer.fr/doc/00294/40568/39467.pdf
https://archimer.ifremer.fr/doc/00294/40568/39468.pdf
https://doi.org/10.1002/2014PA002727
https://archimer.ifremer.fr/doc/00294/40568/
id ftarchimer:oai:archimer.ifremer.fr:40568
record_format openpolar
spelling ftarchimer:oai:archimer.ifremer.fr:40568 2023-05-15T13:50:50+02:00 Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years Ronge, Thomas A. Steph, Silke Tiedemann, Ralf Prange, Matthias Merkel, Ute Nuernberg, Dirk Kuhn, Gerhard 2015-02 application/pdf https://archimer.ifremer.fr/doc/00294/40568/39465.pdf https://archimer.ifremer.fr/doc/00294/40568/39466.docx https://archimer.ifremer.fr/doc/00294/40568/39467.pdf https://archimer.ifremer.fr/doc/00294/40568/39468.pdf https://doi.org/10.1002/2014PA002727 https://archimer.ifremer.fr/doc/00294/40568/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00294/40568/39465.pdf https://archimer.ifremer.fr/doc/00294/40568/39466.docx https://archimer.ifremer.fr/doc/00294/40568/39467.pdf https://archimer.ifremer.fr/doc/00294/40568/39468.pdf doi:10.1002/2014PA002727 https://archimer.ifremer.fr/doc/00294/40568/ 2015. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2015-02 , Vol. 30 , N. 2 , P. 23-38 AAIW UCDW SW-Pacific stable isotopes text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1002/2014PA002727 2021-09-23T20:27:02Z Glacial/interglacial changes in Southern Ocean's air-sea gas exchange have been considered as important mechanisms contributing to the glacial/interglacial variability in atmospheric CO2. Hence, understanding past variability in Southern Ocean intermediate to deep water chemistry and circulation is fundamental to constrain the role of these processes on modulating glacial/interglacial changes in the global carbon cycle. Our study focused on the glacial/interglacial variability in the vertical extent of southwest Pacific Antarctic Intermediate Water (AAIW). We compared carbon and oxygen isotope records from epibenthic foraminifera of sediment cores bathed in modern AAIW and Upper Circumpolar Deep Water (UCDW; 943–2066 m water depth) to monitor changes in water mass circulation spanning the past 350,000 years. We propose that pronounced freshwater input by melting sea ice into the glacial AAIW significantly hampered the downward expansion of southwest Pacific AAIW, consistent with climate model results for the Last Glacial Maximum. This process led to a pronounced upward displacement of the AAIW-UCDW interface during colder climate conditions and therefore to an expansion of the glacial carbon pool. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Pacific Southern Ocean Paleoceanography 30 2 23 38
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
topic AAIW
UCDW
SW-Pacific
stable isotopes
spellingShingle AAIW
UCDW
SW-Pacific
stable isotopes
Ronge, Thomas A.
Steph, Silke
Tiedemann, Ralf
Prange, Matthias
Merkel, Ute
Nuernberg, Dirk
Kuhn, Gerhard
Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
topic_facet AAIW
UCDW
SW-Pacific
stable isotopes
description Glacial/interglacial changes in Southern Ocean's air-sea gas exchange have been considered as important mechanisms contributing to the glacial/interglacial variability in atmospheric CO2. Hence, understanding past variability in Southern Ocean intermediate to deep water chemistry and circulation is fundamental to constrain the role of these processes on modulating glacial/interglacial changes in the global carbon cycle. Our study focused on the glacial/interglacial variability in the vertical extent of southwest Pacific Antarctic Intermediate Water (AAIW). We compared carbon and oxygen isotope records from epibenthic foraminifera of sediment cores bathed in modern AAIW and Upper Circumpolar Deep Water (UCDW; 943–2066 m water depth) to monitor changes in water mass circulation spanning the past 350,000 years. We propose that pronounced freshwater input by melting sea ice into the glacial AAIW significantly hampered the downward expansion of southwest Pacific AAIW, consistent with climate model results for the Last Glacial Maximum. This process led to a pronounced upward displacement of the AAIW-UCDW interface during colder climate conditions and therefore to an expansion of the glacial carbon pool.
format Article in Journal/Newspaper
author Ronge, Thomas A.
Steph, Silke
Tiedemann, Ralf
Prange, Matthias
Merkel, Ute
Nuernberg, Dirk
Kuhn, Gerhard
author_facet Ronge, Thomas A.
Steph, Silke
Tiedemann, Ralf
Prange, Matthias
Merkel, Ute
Nuernberg, Dirk
Kuhn, Gerhard
author_sort Ronge, Thomas A.
title Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
title_short Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
title_full Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
title_fullStr Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
title_full_unstemmed Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years
title_sort pushing the boundaries: glacial/interglacial variability of intermediate and deep waters in the southwest pacific over the last 350,000 years
publisher Amer Geophysical Union
publishDate 2015
url https://archimer.ifremer.fr/doc/00294/40568/39465.pdf
https://archimer.ifremer.fr/doc/00294/40568/39466.docx
https://archimer.ifremer.fr/doc/00294/40568/39467.pdf
https://archimer.ifremer.fr/doc/00294/40568/39468.pdf
https://doi.org/10.1002/2014PA002727
https://archimer.ifremer.fr/doc/00294/40568/
geographic Antarctic
Pacific
Southern Ocean
geographic_facet Antarctic
Pacific
Southern Ocean
genre Antarc*
Antarctic
Sea ice
Southern Ocean
genre_facet Antarc*
Antarctic
Sea ice
Southern Ocean
op_source Paleoceanography (0883-8305) (Amer Geophysical Union), 2015-02 , Vol. 30 , N. 2 , P. 23-38
op_relation https://archimer.ifremer.fr/doc/00294/40568/39465.pdf
https://archimer.ifremer.fr/doc/00294/40568/39466.docx
https://archimer.ifremer.fr/doc/00294/40568/39467.pdf
https://archimer.ifremer.fr/doc/00294/40568/39468.pdf
doi:10.1002/2014PA002727
https://archimer.ifremer.fr/doc/00294/40568/
op_rights 2015. American Geophysical Union. All Rights Reserved.
info:eu-repo/semantics/openAccess
restricted use
op_doi https://doi.org/10.1002/2014PA002727
container_title Paleoceanography
container_volume 30
container_issue 2
container_start_page 23
op_container_end_page 38
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