{"refrec":{"BRefID":347565,"RR":"Pohl, A.; Lu, Z.; Lu, W.; Stockey, R.G.; Elrick, M.; Li, M.; Desrochers, A.; Shen, Y.; He, R.; Finnegan, S.; Ridgwell, A. (2021). Vertical decoupling in Late Ordovician anoxia due to reorganization of ocean circulation. Nature Geoscience 14(11): 868-873. https://dx.doi.org/10.1038/s41561-021-00843-9","BEntID":344257,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". Nature Geoscience 14(11): 868-873. https://dx.doi.org/10.1038/s41561-021-00843-9","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Pohl, A.; Lu, Z.; Lu, W.; Stockey, R.G.; Elrick, M.; Li, M.; Desrochers, A.; Shen, Y.; He, R.; Finnegan, S.; Ridgwell, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Pohl, A. et al.","Englishabstract":"Geochemical redox proxies indicate that seafloor anoxia occurred during the latest Ordovician glacial maximum, coincident with the second pulse of the Late Ordovician mass extinction. However, expanded anoxia in a glacial climate strikingly contrasts with the warming-associated Mesozoic anoxic events and raises questions as to both the causal mechanism of ocean deoxygenation and its relationship with extinction. Here we firstly report iodine-to-calcium ratio (I/Ca) data that document increased upper-ocean oxygenation despite the concurrent expansion of seafloor anoxia. We then resolve these apparently conflicting observations as well as their relationship to global climate by means of a series of Earth system model simulations. Applying available Late Ordovician (Hirnantian) sea-surface temperature estimates from oxygen isotope studies as constraints, alongside our I/Ca data, leads us to identify a scenario in which Hirnantian glacial conditions permit both the spread of seafloor anoxia and increased upper-ocean oxygenation. Our simulated mechanism of a reorganization of global ocean circulation, with reduced importance of northern-sourced waters and a poorer ventilated and deoxygenated deep ocean has parallels with Pleistocene state transitions in Atlantic meridional overturning (despite a very different continental configuration) and suggests that no simple and predictable relationship between past climate state and oxygenation may exist.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Vertical decoupling in Late Ordovician anoxia due to reorganization of ocean circulation","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-11-25","DateCreate":"2021-11-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000713553400006","VABBcode":null,"OpenAcc":0,"DOI":"10.1038/s41561-021-00843-9"},"refs":null,"anarec":{"AnaID":347565,"PubliDate":2021,"Pagination":"868-873","XtraPublOfAnaID":null,"ISBN":null,"Volume":"14","Issue":"11","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":123796,"SerRR":"Nature Geoscience. 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