Paleo Agulhas rings enter the subtropical gyre during the penultimate deglaciation Scussolini, P en_US van Sebille, Erik en_US Durgadoo, J en_US 2021-11-25T12:29:44Z 2021-11-25T12:29:44Z 2013 en_US
dc.description.abstract A maximum in the strength of Agulhas leakage has been registered at the interface between the Indian and South Atlantic oceans during glacial Termination II (T-II). This presumably transported the salt and heat necessary for maintaining the Atlantic circulation at rates similar to the present day. However, it was never shown whether these waters were effectively incorporated into the South Atlantic gyre, or whether they retroflected into the Indian and/or Southern oceans. To resolve this question, we investigate the presence of paleo Agulhas rings from a sediment core on the central Walvis Ridge, almost 1800 km farther into the Atlantic Basin than previously studied. Analysis of a 60 yr data set from the global-nested INALT01 model allows us to relate density perturbations at the depth of the thermocline to the passage of individual rings over the core site. Using this relation from the numerical model as the basis for a proxy, we generate a time series of variability of individual Globorotalia truncatulinoides delta O-18. We reveal high levels of pycnocline depth variability at the site, suggesting enhanced numbers of Agulhas rings moving into the South Atlantic Gyre around T-II. Our record closely follows the published quantifications of Agulhas leakage from the east of the Cape Basin, and thus shows that Indian Ocean waters entered the South Atlantic circulation. This provides crucial support for the view of a prominent role of the Agulhas leakage in the shift from a glacial to an interglacial mode of the Atlantic circulation. en_US
dc.identifier.issn 1814-9324 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.title Paleo Agulhas rings enter the subtropical gyre during the penultimate deglaciation en_US
dc.type Journal Article en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 6 en_US
unsw.relation.ispartofjournal Climate of the Past en_US
unsw.relation.ispartofpagefrompageto 2631-2639 en_US
unsw.relation.ispartofvolume 9 en_US
unsw.relation.originalPublicationAffiliation Scussolini, P en_US
unsw.relation.originalPublicationAffiliation van Sebille, Erik, Climate Change Research Centre (CCRC), Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Durgadoo, J en_US School of Biological, Earth & Environmental Sciences *
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