{"refrec":{"BRefID":210835,"RR":"<b>Jacquet, S.H.M.; Dehairs, F.; Dumont, I.; Becquevort, S.; Cavagna, A.J.; Cardinal, D.</b> (2011). Twilight zone organic carbon remineralization in the Polar Front Zone and Subantarctic Zone south of Tasmania. <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 58(21-22)</i>: 2222-2234. <a href=\"http://dx.doi.org/10.1016/j.dsr2.2011.05.029\" target=\"_blank\">dx.doi.org/10.1016/j.dsr2.2011.05.029</a>","BEntID":202757,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 58(21-22)</i>: 2222-2234. <a href=\"https://dx.doi.org/10.1016/j.dsr2.2011.05.029\" target=\"_blank\">https://dx.doi.org/10.1016/j.dsr2.2011.05.029</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jacquet, S.H.M.; Dehairs, F.; Dumont, I.; Becquevort, S.; Cavagna, A.J.; Cardinal, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jacquet, S.H.M. <i>et al.</i>","Englishabstract":"We report on the distribution of excess, non-lithogenic particulate barium (Ba<sub>xs</sub>), a proxy for twilight zone remineralization of organic matter, in the Australian sector of the Southern Ocean during the mid-austral summer 2007. This study was part of a broader investigation focusing on macro- and micronutrient availability controlling ecosystem functioning in this area. Mesopelagic particulate excess Ba (Ba<sub>xs</sub>) in the twilight zone (focus was on the 100-600 m depth layer) proved to be significantly controlled by the vertical distribution of bacterial activity, with higher Ba<sub>xs</sub> contents in situations where significant bacterial activity extended deeper in the water column. However, despite this covariation, the magnitude of the carbon fluxes as estimated from Ba<sub>xs</sub> and bacterial activity did not match well, with carbon demand based on bacterial activity largely exceeding organic carbon remineralization estimated from Ba<sub>xs</sub>. Possible reasons for this discrepancy are discussed. It appeared that the magnitude of the mesopelagic carbon remineralization flux obtained from Ba<sub>xs</sub> was realistic when weighted against primary, new and export productions. Our findings corroborate earlier results indicating that mesopelagic carbon remineralization in the 100-600 m depth layer increases from the Subantarctic Zone (SAZ) toward the Polar Front, and from spring to late summer. We observed furthermore that the iron-replete Subantarctic Zone east of the Tasman Plateau had a higher mesopelagic remineralization efficiency (on average 91 +/- 20% of the carbon exported from the upper 100 m was remineralized before reaching 600 m) compared to the Fe-limited SAZ area west of the plateau and the Polar Front Zone, where mesopelagic remineralization efficiencies ranged between 21 +/- 5% and 64 +/- 24%, respectively. SAZ-East and SAZ-West sites thus differed in their efficiency of carbon sequestration into the deep ( > 600 m) water column, with SAZ-West exceeding the sequestration capacity of SAZ-East.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Twilight zone organic carbon remineralization in the Polar Front Zone and Subantarctic Zone south of Tasmania","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":"Biological pump; Particulate biogenic barium; Mesopelagic carbon","OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2015-11-06","DateCreate":"2011-12-22","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000295762400015","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.dsr2.2011.05.029"},"refs":null,"anarec":{"AnaID":210835,"PubliDate":2011,"Pagination":"2222-2234","XtraPublOfAnaID":null,"ISBN":null,"Volume":"58","Issue":"21-22","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45197,"SerRR":"Deep-Sea Research, Part II. 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