Centennial-scale climate variability in the Timor Sea during Marine Isotope Stage 3

Dürkop, Anke, Holbourn, Ann, Kuhnt, Wolfgang, Zuraida, Rina, Andersen, Nils and Grootes, Pieter M. (2008) Centennial-scale climate variability in the Timor Sea during Marine Isotope Stage 3 Marine Micropaleontology, 66 (3/4). pp. 208-221. DOI 10.1016/j.marmicro.2007.10.002.

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We present a high-resolution (∼ 60–110 yr) multi-proxy record spanning Marine Isotope Stage 3 from IMAGES Core MD01-2378 (13°04.95′ S and 121°47.27′ E, 1783 m water depth), located in the Timor Sea, off NW Australia. Today, this area is influenced by the Intertropical Convergence Zone, which drives monsoonal winds during austral summer and by the main outflow of the Indonesian Throughflow, which represents a key component of the global thermohaline circulation system. Thus, this core is ideally situated to monitor the linkages between tropical and high latitude climate variability. Benthic δ18O data (Planulina wuellerstorfi) clearly reflect Antarctic warm events (A1–A4) as recorded by the EPICA Byrd and Dronning Maud Land ice cores. This southern high latitude signal is transferred by deep and intermediate water masses flowing northward from the Southern Ocean into the Indian Ocean. Planktonic δ18O shows closer affinity to northern high latitudes planktonic and ice core records, although only the longer-lasting Dansgaard–Oeschger warm events, 8, 12, 14, and 16–17 are clearly expressed in our record. This northern high latitude signal in the surface water is probably transmitted through atmospheric teleconnections and coupling of the Asian–Australian monsoon systems. Benthic foraminiferal census counts suggest a coupling of Antarctic cooling with carbon flux patterns in the Timor Sea. We relate increasing abundances of carbon-flux sensitive species at 38–45 ka to the northeastward migration of the West Australian Current frontal area. This water mass reorganization is also supported by concurrent decreases in Mg/Ca and planktonic δ18O values (Globigerinoides ruber white).

Document Type: Article
Keywords: Marine Isotope Stage 3; stable isotopes; foraminifera; Timor Sea; paleoclimate, WEPAMA Cruise, RV Marion Dufresne
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1016/j.marmicro.2007.10.002
ISSN: 0377-8398
Projects: Future Ocean, IMAGES
Date Deposited: 18 Dec 2008 12:50
Last Modified: 21 Jun 2017 09:14
URI: http://eprints.uni-kiel.de/id/eprint/1373

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