{"refrec":{"BRefID":348332,"RR":"<b>Yan, Y.; Brook, E.J.; Kurbatov, A.V.; Severinghaus, J.P.; Higgins, J.A.</b> (2021). Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition. <i>Science Advances 7(51)</i>: eabj9341. <a href=\"https://dx.doi.org/10.1126/sciadv.abj9341\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.abj9341</a>","BEntID":345026,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Science Advances 7(51)</i>: eabj9341. <a href=\"https://dx.doi.org/10.1126/sciadv.abj9341\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.abj9341</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Yan, Y.; Brook, E.J.; Kurbatov, A.V.; Severinghaus, J.P.; Higgins, J.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Yan, Y. <i>et al.</i>","Englishabstract":"The history of atmospheric oxygen (<i>P</i>O<sub>2</sub>) and the processes that act to regulate it remain enigmatic because of difficulties in quantitative reconstructions using indirect proxies. Here, we extend the ice-core record of <i>P</i>O<sub>2</sub> using 1.5-million-year-old (Ma) discontinuous ice samples drilled from Allan Hills Blue Ice Area, East Antarctica. No statistically significant difference exists in <i>P</i>O<sub>2</sub> between samples at 1.5 Ma and 810 thousand years (ka), suggesting that the Late-Pleistocene imbalance in O<sub>2</sub> sources and sinks began around the time of the transition from 40- to 100-ka glacial cycles in the Mid-Pleistocene between ~1.2 Ma and 700 ka. The absence of a coeval secular increase in atmospheric CO<sub>2</sub> over the past ~1 Ma requires negative feedback mechanisms such as <i>P</i><span data-style=\"small-caps\">co</span><sub>2</sub>-dependent silicate weathering. Fast processes must also act to suppress the immediate <i>P</i><span data-style=\"small-caps\">co</span><sub>2</sub> increase because of the imbalance in O<sub>2</sub> sinks over sources beginning in the Mid-Pleistocene.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Ice core evidence for atmospheric oxygen decline since the Mid-Pleistocene transition","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":"2021-12-17","DateCreate":"2021-12-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000730600400012","VABBcode":null,"OpenAcc":1,"DOI":"10.1126/sciadv.abj9341"},"refs":null,"anarec":{"AnaID":348332,"PubliDate":2021,"Pagination":"eabj9341","XtraPublOfAnaID":null,"ISBN":null,"Volume":"7","Issue":"51","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":248966,"SerRR":"Science Advances. 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