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 and Kuhn, Gerhard (2015) Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years. Open Access Paleoceanography, 30 (2). pp. 23-38. DOI 10.1002/2014PA002727.

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Abstract

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.

Document Type: Article
Additional Information: WOS:000351469300001
Keywords: AAIW; Stable isotopes; SW-Pacific; UCDW; MD152; SO213/2
Research affiliation: MARUM
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
AWI
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2014PA002727
ISSN: 0883-8305
Projects: SOPATRA
Expeditions/Models/Experiments:
Date Deposited: 26 Feb 2015 13:06
Last Modified: 23 Sep 2019 18:52
URI: http://oceanrep.geomar.de/id/eprint/27670

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