Increased reservoir ages and poorly ventilated deep waters inferred in the glacial Eastern Equatorial Pacific

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de la Fuente, Maria ; Skinner, Luke ; Calvo, Eva ; Pelejero, Carles ; Cacho, Isabel (2015)

Consistent evidence for a poorly ventilated deep Pacific Ocean that could have released its radiocarbon-depleted carbon stock to the atmosphere during the last deglaciation has long been sought. Such evidence remains lacking, in part due to a paucity of surface reservoir age reconstructions required for accurate deep ocean ventilation age estimates. Here we combine new radiocarbon data from the Eastern Equatorial Pacific (EEP) with chronostratigraphic calendar age constraints to estimate shallow sub-surface reservoir age variability, and thus provide estimates of deep ocean ventilation ages. Both shallow- and deep water ventilation ages drop across the last deglaciation, consistent with similar reconstructions from the South Pacific and Southern Ocean. The observed regional fingerprint linking the Southern Ocean and the EEP is consistent with a dominant southern source for EEP thermocline waters and suggests relatively invariant ocean interior transport pathways but significantly reduced air-sea gas exchange in the glacial southern high latitudes. We acknowledge funding by the Spanish Ministry of Economy and Competitiveness through grants CTM2009-08849 (ACDC Project) and CTM2012-32017 (MANIFEST Project). M. de la Fuente was funded by a FPI studentship (BES-2010-039700) from the Spanish Government, and L. Skinner acknowledges support from NERC grant NE/L006421/1. This is the final version. It first appeared at http://www.nature.com/ncomms/2015/150703/ncomms8420/full/ncomms8420.html.
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    We would like to thank J. Pen╦ťa-Izquierdo and P.J. Llanillo for insightful discussions on modern water-mass pathways in the Pacific Ocean. P. Povea and J. Torner are also thanked for assistance with foraminifera identification and picking. We are also grateful for the assistance of A.E. Scrivner with graphitization and R. Reimer with AMS analysis. We acknowledge funding by the Spanish Ministry of Economy and Competitiveness through grants CTM2009-08849 (ACDC Project) and CTM2012-32017 (MANIFEST Project). M.dlF. was funded by a FPI studentship (BES-2010-039700) from the Spanish Government, and L.S. acknowledges support from the NERC grant NE/L006421/1. I.C. thanks the ICREA Academia program from Generalitat de Catalunya and C.P. the Generalitat de Catalunya through grant 2014SGR1029.

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