Show simple item record

dc.contributor.authorOppo, Delia W.  Concept link
dc.contributor.authorGebbie, Geoffrey A.  Concept link
dc.contributor.authorHuang, Kuo-Fang  Concept link
dc.contributor.authorCurry, William B.  Concept link
dc.contributor.authorMarchitto, Thomas M.  Concept link
dc.contributor.authorPietro, Kathryn R.  Concept link
dc.identifier.citationPaleoceanography and Paleoclimatology 33 (2018): 1013-1034en_US
dc.description© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Paleoceanography and Paleoclimatology 33 (2018): 1013-1034, doi:10.1029/2018PA003408.en_US
dc.description.abstractThe chemical composition of benthic foraminifera from marine sediment cores provides information on how glacial subsurface water properties differed from modern, but separating the influence of changes in the origin and end‐member properties of subsurface water from changes in flows and mixing is challenging. Spatial gaps in coverage of glacial data add to the uncertainty. Here we present new data from cores collected from the Demerara Rise in the western tropical North Atlantic, including cores from the modern tropical phosphate maximum at Antarctic Intermediate Water (AAIW) depths. The results suggest lower phosphate concentration and higher carbonate saturation state within the phosphate maximum than modern despite similar carbon isotope values, consistent with less accumulation of respired nutrients and carbon, and reduced air‐sea gas exchange in source waters to the region. An inversion of new and published glacial data confirms these inferences and further suggests that lower preformed nutrients in AAIW, and partial replacement of this still relatively high‐nutrient AAIW with nutrient‐depleted, carbonate‐rich waters sourced from the region of the modern‐day northern subtropics, also contributed to the observed changes. The results suggest that glacial preformed and remineralized phosphate were lower throughout the upper Atlantic, but deep phosphate concentration was higher. The inversion, which relies on the fidelity of the paleoceanographic data, suggests that the partial replacement of North Atlantic sourced deep water by Southern Ocean Water was largely responsible for the apparent deep North Atlantic phosphate increase, rather than greater remineralization.en_US
dc.description.sponsorshipNational Science Foundation (NSF) Grant Numbers: OCE‐0750880, OCE‐1335191, OCE‐1558341, OCE‐1536380; Woods Hole Oceanographic Institution (WHOI) Grant Numbers: 27007592, 27000808en_US
dc.publisherJohn Wiley & Sonsen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectGlacial Atlantic circulationen_US
dc.subjectPreformed phosphateen_US
dc.subjectRemineralized phosphateen_US
dc.subjectAntarctic Intermediate Wateren_US
dc.subjectNutrient redistributionen_US
dc.subjectTropical phosphate maximumen_US
dc.titleData constraints on glacial Atlantic Water mass geometry and propertiesen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International