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 circulation is...
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ftawi:oai:epic.awi.de:37305 2023-05-15T13:40:26+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 Nürnberg, Dirk Kuhn, Gerhard 2015-02-11 https://epic.awi.de/id/eprint/37305/ https://hdl.handle.net/10013/epic.44995 unknown Wiley Ronge, T. A. orcid:0000-0003-2625-719X , Steph, S. , Tiedemann, R. orcid:0000-0001-7211-8049 , Prange, M. , Merkel, U. , Nürnberg, D. and Kuhn, G. orcid:0000-0001-6069-7485 (2015) Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years , Paleoceanography, 30 (2), pp. 23-38 . doi:10.1002/2014PA002727 <https://doi.org/10.1002/2014PA002727> , hdl:10013/epic.44995 EPIC3Paleoceanography, Wiley, 30(2), pp. 23-38, ISSN: 0883-8305 Article isiRev 2015 ftawi https://doi.org/10.1002/2014PA002727 2021-12-24T15:40:14Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Pacific Southern Ocean Paleoceanography 30 2 23 38 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 Nürnberg, Dirk Kuhn, Gerhard |
spellingShingle |
Ronge, Thomas A. Steph, Silke Tiedemann, Ralf Prange, Matthias Merkel, Ute Nürnberg, Dirk Kuhn, Gerhard Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years |
author_facet |
Ronge, Thomas A. Steph, Silke Tiedemann, Ralf Prange, Matthias Merkel, Ute Nürnberg, 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 |
Wiley |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37305/ https://hdl.handle.net/10013/epic.44995 |
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 |
EPIC3Paleoceanography, Wiley, 30(2), pp. 23-38, ISSN: 0883-8305 |
op_relation |
Ronge, T. A. orcid:0000-0003-2625-719X , Steph, S. , Tiedemann, R. orcid:0000-0001-7211-8049 , Prange, M. , Merkel, U. , Nürnberg, D. and Kuhn, G. orcid:0000-0001-6069-7485 (2015) Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years , Paleoceanography, 30 (2), pp. 23-38 . doi:10.1002/2014PA002727 <https://doi.org/10.1002/2014PA002727> , hdl:10013/epic.44995 |
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 |
_version_ |
1766134373444222976 |