{"refrec":{"BRefID":334397,"RR":"<b>Clarkson, M.O.; Lenton, T.M.; Andersen, M.B.; Bagard, M.L.; Dickson, A.J.; Vance, D.</b> (2021). Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes. <i>Nature Comm. 12(1)</i>: 399. <a href=\"https://dx.doi.org/10.1038/s41467-020-20486-5\" target=\"_blank\">https://dx.doi.org/10.1038/s41467-020-20486-5</a>","BEntID":330953,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Nature Comm. 12(1)</i>: 399. <a href=\"https://dx.doi.org/10.1038/s41467-020-20486-5\" target=\"_blank\">https://dx.doi.org/10.1038/s41467-020-20486-5</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Clarkson, M.O.; Lenton, T.M.; Andersen, M.B.; Bagard, M.L.; Dickson, A.J.; Vance, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Clarkson, M.O. <i>et al.</i>","Englishabstract":"The Paleocene Eocene Thermal Maximum (PETM) represents a major carbon cycle and climate perturbation that was associated with ocean de-oxygenation, in a qualitatively similar manner to the more extensive Mesozoic Oceanic Anoxic Events. Although indicators of ocean de-oxygenation are common for the PETM, and linked to biotic turnover, the global extent and temporal progression of de-oxygenation is poorly constrained. Here we present carbonate associated uranium isotope data for the PETM. A lack of resolvable perturbation to the U-cycle during the event suggests a limited expansion of seafloor anoxia on a global scale. We use this result, in conjunction with a biogeochemical model, to set an upper limit on the extent of global seafloor de-oxygenation. The model suggests that the new U isotope data, whilst also being consistent with plausible carbon emission scenarios and observations of carbon cycle recovery, permit a maximum ~10-fold expansion of anoxia, covering <2% of seafloor area.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:57.285622","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-03-04","DateCreate":"2021-03-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000609615100020","VABBcode":null,"OpenAcc":1,"DOI":"10.1038/s41467-020-20486-5"},"refs":null,"anarec":{"AnaID":334397,"PubliDate":2021,"Pagination":"399","XtraPublOfAnaID":null,"ISBN":null,"Volume":"12","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":198717,"SerRR":"Nature Communications. 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