{"refrec":{"BRefID":404489,"RR":"<b>Hättig, K.; Schouten, S.; Louwye, S.; van der Meer, M.T.J.</b> (2024). Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean. <i>Paleoceanography and Paleoclimatology 39(10)</i>: e2024PA004852. <a href=\"https://dx.doi.org/10.1029/2024pa004852\" target=\"_blank\">https://dx.doi.org/10.1029/2024pa004852</a>","BEntID":402280,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Paleoceanography and Paleoclimatology 39(10)</i>: e2024PA004852. <a href=\"https://dx.doi.org/10.1029/2024pa004852\" target=\"_blank\">https://dx.doi.org/10.1029/2024pa004852</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hättig, K.; Schouten, S.; Louwye, S.; van der Meer, M.T.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hättig, K. <i>et al.</i>","Englishabstract":"The Middle Miocene is characterized by a long-term increase in the stable oxygen isotopic composition of benthic foraminifera (<i>δ</i><sup>18</sup>O<sub>benthic</sub>). However, it is unclear to what extent this increase reflects changes in seawater isotopic composition or deep water temperature. We present a high-resolution alkenone hydrogen isotope (<i>δ</i><sup>2</sup>H<sub>C37</sub>) record of the Middle Miocene from a core taken at the upper slope edge (about 409&nbsp;m water depth) of the Porcupine Basin continental margin in the eastern North Atlantic Ocean, Site U1318 of the Integrated Ocean Drilling Program. The <i>δ</i><sup>2</sup>H<sub>C37</sub> values vary between −174 and −200‰ with an average of −191&nbsp;±&nbsp;5‰, similar to modern open-ocean values. Importantly, they do not show a long-term increase in surface seawater isotopes (<i>δ</i><sup>2</sup>H<sub>SSW</sub>) during the Middle Miocene Climate Transition. Indeed, when <i>δ</i><sup>18</sup>O<sub>benthic</sub> is corrected for subsurface temperature, the bottom seawater oxygen isotopes (<i>δ</i><sup>18</sup>O<sub>BSW</sub>) show no significant increase in this period. When the latter record is translated into the hydrogen isotopic composition of bottom seawater using the modern open-ocean waterline, it has an average value of 5.8&nbsp;±&nbsp;1.5‰, similar to the <i>δ</i><sup>2</sup>H<sub>SSW</sub> of 5.2&nbsp;±&nbsp;3.1‰ derived from <i>δ</i><sup>2</sup>H<sub>C37:2,</sub> suggesting a relatively small difference between bottom and surface waters. Our results suggest a stable global surface seawater isotope evolution during the Middle Miocene, coupled with a long-term decrease in bottom water temperature.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-09-25 01:36:50.712317","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"seawater isotopes; Middle Miocene; hydrogen isotopes; Alkenones","OtherDescriptors":null,"Notes":null,"AnaPub":2024,"MonPub":null,"DateUpdate":"2025-09-18","DateCreate":"2024-11-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001321016800001","VABBcode":null,"OpenAcc":1,"DOI":"10.1029/2024pa004852"},"refs":null,"anarec":{"AnaID":404489,"PubliDate":2024,"Pagination":"e2024PA004852","XtraPublOfAnaID":null,"ISBN":null,"Volume":"39","Issue":"10","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":292301,"SerRR":"Paleoceanography and Paleoclimatology. 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