{"refrec":{"BRefID":393658,"RR":"<b>Si, W.; Novak, J.; Richter, N.; Polissar, P.; Ma, R.; Santos, E.; Nirenberg, J.; Herbert, T.D.; Aubry, M.-P.</b> (2024). Alkenone-derived estimates of Cretaceous <i>p</i>CO2. <i>Geology (Boulder Colo.) 52(7)</i>: 555-559. <a href=\"https://dx.doi.org/10.1130/g51939.1\" target=\"_blank\">https://dx.doi.org/10.1130/g51939.1</a>","BEntID":391446,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geology (Boulder Colo.) 52(7)</i>: 555-559. <a href=\"https://dx.doi.org/10.1130/g51939.1\" target=\"_blank\">https://dx.doi.org/10.1130/g51939.1</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Si, W.; Novak, J.; Richter, N.; Polissar, P.; Ma, R.; Santos, E.; Nirenberg, J.; Herbert, T.D.; Aubry, M.-P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Si, W. <i>et al.</i>","Englishabstract":"<span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">Alkenones are long-chain ketones produced by phytoplankton of the order Isochrysidales. They are widely used in reconstructing past sea surface temperatures, benefiting from their ubiquitous occurrence in the Cenozoic ocean. Carbon isotope fractionation (ε</span><sub>p</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">) between alkenones and dissolved inorganic carbon may also be used as a proxy for past atmospheric </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> and has provided continuous </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> estimates back to ca. 45 Ma. Here, an extended occurrence of alkenones from ca. 130 Ma is reported. We characterize the molecular structure and distribution of these Mesozoic alkenones and evaluate their potential phylogenetic relationship with Cenozoic alkenones. Using δ</span><sup>13</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">C values of the C</span><sub>37</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> methyl alkenone (C</span><sub>37:2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">Me), the first alkenone-based </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> estimates for the Mesozoic are derived. These estimates suggest elevated </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> with a range of 548–4090 ppm (908 ppm median) during the super-greenhouse climate of the Early Cretaceous, in agreement with phytane-based </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> reconstructions. Finally, insights into the identity of the Cretaceous coccolithophores that possibly synthesized alkenones are also offered.</span>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Alkenone-derived estimates of Cretaceous <i>p</i>CO2","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-18 01:32:44.976816","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"algae; alkenones; Atlantic Ocean; C-13; carbon; carbon dioxide; Coccolithophoraceae; Cretaceous; Deep Sea Drilling Project; Demerara Rise; DSDP Site 534; Equatorial Atlantic; Galicia Bank; IPOD; isotopes; ketones; Leg 76; Leg 103; Leg 207; Mesozoic; microfossils; North Atlantic; Northeast Atlantic; Northwest Atlantic; Ocean Drilling Program; ODP Site 638; ODP Site 1257; organic compounds; paleoatmosphere; paleoclimatology; stable isotopes; West Atlantic","OtherDescriptors":null,"Notes":null,"AnaPub":2024,"MonPub":null,"DateUpdate":"2024-11-26","DateCreate":"2024-07-30","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1,"DOI":"10.1130/g51939.1"},"refs":null,"anarec":{"AnaID":393658,"PubliDate":2024,"Pagination":"555-559","XtraPublOfAnaID":null,"ISBN":null,"Volume":"52","Issue":"7","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42917,"SerRR":"Geology. 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