{"refrec":{"BRefID":76253,"RR":"<b>Fischer, G.; Müller, P.J.; Wefer, G.</b> (1998). Latitudinal δ<sup>13</sup>C<sub>org</sub> variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO<sub>2</sub> and implications for paleo-PCO<sub>2</sub> reconstructions. <i>J. Mar. Syst. 17(1-4)</i>: 471-495. <a href=\"https://dx.doi.org/10.1016/S0924-7963(98)00059-1\" target=\"_blank\">https://dx.doi.org/10.1016/S0924-7963(98)00059-1</a>","BEntID":71868,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Syst. 17(1-4)</i>: 471-495. <a href=\"https://dx.doi.org/10.1016/S0924-7963(98)00059-1\" target=\"_blank\">https://dx.doi.org/10.1016/S0924-7963(98)00059-1</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fischer, G.; Müller, P.J.; Wefer, G.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fischer, G.; Müller, P.J.; Wefer, G.","Englishabstract":"Latitudinal variations of δ<sup>13</sup>C<sub>org</sub> of plankton, sinking particles and surface sediments of the southern Atlantic Ocean have been compiled and compared to literature-derived [CO<sub>2</sub> (aq)] values in surface waters. We observed less variability of the sediment-δ<sup>13</sup>C data at a given latitude compared to the plankton values which more sensitively record seasonal changes. In the tropical–subtropical Atlantic with low seasonality, we measured a relatively small latitudinal variation (−18.5 to −22.5‰) of the sediment-δ<sup>13</sup>C. In contrast, a steep gradient of both isotope values and [CO<sub>2</sub> (aq)] was found south of 40°S. South of 60°S, the sediment-δ<sup>13</sup>C values were between −23 and −26.5‰ corresponding to generally higher [CO<sub>2</sub> (aq)] values. The surface sediments were generally heavier by 0.5–3.2‰ in the tropical–subtropical Atlantic and 3.0–4.6‰ in Southern Ocean, respectively, compared to sinking matter; they were also heavier by up to 3.2‰ than freshly sedimented phytodetritus sampled in the Southern Ocean. These differences may at least be partly attributed to the anthropogenic PCO<sub>2</sub> increase leading to an enhanced effect in the Southern Ocean due to increasing CO<sub>2</sub> solubility. We estimated the preindustrial [CO<sub>2</sub> (aq)] from sediment-δ<sup>13</sup>C<sub>org</sub> to be lower by 1–2 μmol l<sup>−1</sup> in warm waters and up to 8 μmol l<sup>−1</sup> in cold waters compared to present day measurements. We found that the isotope values of the surface sediments were generally linked to surface water [CO<sub>2</sub> (aq)] (preindustrial), resulting in a relationship rather similar to that derived from plankton data [Rau, G.H., 1994. Variations in sedimentary organic δ<sup>13</sup>C as a proxy for past changes in ocean and atmospheric CO<sub>2</sub> concentrations. In: Zahn, R., Pedersen, T.F., Kaminski, M.A., Labeyrie, L. (Eds.), Carbon Cycling in the Glacial Ocean, NATO Asi Series, Global Environmental Change, Vol. 17]. However, estimations of past [CO<sub>2</sub> (aq)] from sediment-δ<sup>13</sup>C<sub>org</sub> may have a large uncertainty especially in the Southern Ocean. Here, our data show the weakest correlation, probably due to effects of changing growth rates and productivity, in particular at the frontal zones.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Latitudinal δ<sup>13</sup>C<sub>org</sub> variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO<sub>2</sub> and implications for paleo-PCO<sub>2</sub> reconstructions","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-23 01:31:56.361590","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1998,"MonPub":null,"DateUpdate":"2021-02-17","DateCreate":"2005-09-06","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000077463500033","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/S0924-7963(98)00059-1"},"refs":null,"anarec":{"AnaID":76253,"PubliDate":1998,"Pagination":"471-495","XtraPublOfAnaID":null,"ISBN":null,"Volume":"17","Issue":"1-4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43079,"SerRR":"Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam.  ISSN 0924-7963; e-ISSN 1879-1573","StandardTitleSer":"Journal of Marine Systems","ISSN":"0924-7963","AbbrevSer":"J. Mar. Syst.","StandardTitleMon":null,"StartPage":471,"Pages":25,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":[{"YBRefID":75795,"RefStrFull":"<b>Le Fèvre, J.; Tréguer, P. (Ed.)</b> (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. <i>Journal of Marine Systems</i>, 17(1-4). Elsevier: Amsterdam.  1-619 pp.","RelID":10,"Relation":"Also appears in","StandardTitle":"Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. 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