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• W2049953938 startingPage "603" @default.
• W2049953938 abstract "Ratios of the radionuclides thorium-230 and protactinium-231 in sediment record ongoing export of 231Pa from the deep central Arctic Ocean and may indicate continuous deep-water exchange between the Arctic and Atlantic oceans throughout the past 35,000 years. Through the production of sea ice and its contributions to the Atlantic meridional overturning circulation, the Arctic Ocean has a major influence on the global climate system. Here, Sharon Hoffmann et al. measure protactinium-231/thorium-230 isotope ratios in seven ocean sediment cores to examine patterns of particle-reactive element deposition during glacial, deglacial and interglacial conditions. They find that the Arctic Ocean has consistently exported water to the Atlantic Ocean during the past 35,000 years. This contrasts with many other areas, where glacial–deglacial climate changes are associated with profound shifts in ocean circulation. The Arctic Ocean has an important role in Earth’s climate, both through surface processes1 such as sea-ice formation and transport, and through the production and export of waters at depth that contribute to the global thermohaline circulation2,3. Deciphering the deep Arctic Ocean’s palaeo-oceanographic history is a crucial part of understanding its role in climatic change. Here we show that sedimentary ratios of the radionuclides thorium-230 (230Th) and protactinium-231 (231Pa), which are produced in sea water and removed by particle scavenging on timescales of decades to centuries, respectively4, record consistent evidence for the export of 231Pa from the deep Arctic and may indicate continuous deep-water exchange between the Arctic and Atlantic oceans throughout the past 35,000 years. Seven well-dated box-core records provide a comprehensive overview of 231Pa and 230Th burial in Arctic sediments during glacial, deglacial and interglacial conditions. Sedimentary 231Pa/230Th ratios decrease nearly linearly with increasing water depth above the core sites, indicating efficient particle scavenging in the upper water column and greater influence of removal by lateral transport at depth. Although the measured 230Th burial is in balance with its production in Arctic sea water, integrated depth profiles for all time intervals reveal a deficit in 231Pa burial that can be balanced only by lateral export in the water column. Because no enhanced sink for 231Pa has yet been found in the Arctic, our records suggest that deep-water exchange through the Fram strait may export 231Pa. Such export may have continued for the past 35,000 years, suggesting a century-scale replacement time for deep waters in the Arctic Ocean since the most recent glaciation and a persistent contribution of Arctic waters to the global ocean circulation." @default.
• W2049953938 created "2016-06-24" @default.
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• W2049953938 date "2013-05-01" @default.
• W2049953938 modified "2023-10-16" @default.
• W2049953938 title "Persistent export of 231Pa from the deep central Arctic Ocean over the past 35,000 years" @default.
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• W2049953938 doi "https://doi.org/10.1038/nature12145" @default.
• W2049953938 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23719461" @default.
• W2049953938 hasPublicationYear "2013" @default.
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