Enhanced ventilation of Eastern North Atlantic Oxygen Minimum Zone with deglacial slowdown of Meridional Overturning

Enhanced ventilation of Eastern North Atlantic Oxygen Minimum Zone with deglacial slowdown of Meridional Overturning | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Enhanced ventilation of Eastern North Atlantic Oxygen Minimum Zone with deglacial slowdown of Meridional Overturning Sofía Barragán-Montilla, Heather Johnstone, Stefan Mulitza, Dharma Macaya, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4083170/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 Jul, 2025 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Abstract The eastern Tropical North Atlantic Oxygen Minimum Zone (ETNA OMZ) sustains unique marine ecosystems off northwestern Africa. One of the key controls of the ETNA OMZ is ventilation driven by the subsurface ocean circulation of the Atlantic subtropical gyres. However, how this shallow circulation interacts with changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC) remains unclear. Here, we present a new deglacial and high-resolution paleo-oxygenation record (GeoB9512-5, 793 m water depth) from the low oxic waters of the margin of ETNA OMZ, that registers more strongly oxygenated periods during the Last Glacial Maximum (LGM), two parts of the Heinrich Stadial 1 (HS1), and the latter part of the Younger Dryas (YD). We show that steeper meridional temperature gradients during HS1 and YD with AMOC slowdown intensified the subsurface subtropical gyre circulation and the oxygen supply to the ETNA. Earth and environmental sciences/Climate sciences/Palaeoceanography Earth and environmental sciences/Solid Earth sciences/Palaeontology Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementaryInformation1PaleoenvironmentalparameteresestimatedpersampleForPDFexport.pdf Supplementary Information 1 - Paleoenvironmental parameteres estimated per sample SupplementaryInformation2BenthicForaminfieracountsandinformationForPDFexport.pdf Supplementary Information 2 - Benthic Foraminfiera counts and information SupplementaryInformation3BenthicForaminiferaImages.pdf Supplementary Information 3 - Benthic Foraminifera Images Cite Share Download PDF Status: Published Journal Publication published 15 Jul, 2025 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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