{"refrec":{"BRefID":254708,"RR":"<b>Lu, Z.; Hoogakker, B.A.A.; Hillenbrand, C.-D.; Zhou, X.; Thomas, E.; Gutchess, K.M.; Lu, W.; Jones, L.; Rickaby, R.E.M.</b> (2016). Oxygen depletion recorded in upper waters of the glacial Southern Ocean. <i>Nature Comm. 7(11146)</i>: 8 pp. <a href=\"http://dx.doi.org/10.1038/ncomms11146\" target=\"_blank\">http://dx.doi.org/10.1038/ncomms11146</a>","BEntID":246713,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Nature Comm. 7(11146)</i>: 8 pp. <a href=\"http://dx.doi.org/10.1038/ncomms11146\" target=\"_blank\">http://dx.doi.org/10.1038/ncomms11146</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Lu, Z.; Hoogakker, B.A.A.; Hillenbrand, C.-D.; Zhou, X.; Thomas, E.; Gutchess, K.M.; Lu, W.; Jones, L.; Rickaby, R.E.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lu, Z. <i>et al.</i>","Englishabstract":"Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than similar to 2.5 mu mol mol(-1) indicate the presence of O-2-depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration during glacial times. A down-core planktonic I/Ca record from south of the Antarctic Polar Front (APF) suggests that minimum O-2 concentrations in the upper ocean fell below 70 mu mol kg(-1) during the last two glacial periods, indicating persistent glacial O-2 depletion at the heart of the carbon engine of the Earth's climate system. These new estimates of past ocean oxygenation variability may assist in resolving mechanisms responsible for the much-debated ice-age atmospheric CO2 decline.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Oxygen depletion recorded in upper waters of the glacial Southern Ocean","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-19 01:31:40.936505","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2016,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2016-04-05","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000373293500001","VABBcode":null,"OpenAcc":1,"DOI":"10.1038/ncomms11146"},"refs":null,"anarec":{"AnaID":254708,"PubliDate":2016,"Pagination":"8 pp","XtraPublOfAnaID":null,"ISBN":null,"Volume":"7","Issue":"11146","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":198717,"SerRR":"Nature Communications. 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