{"refrec":{"BRefID":211192,"RR":"<b>Cavagna, A.J.; Fripiat, F.; Dehairs, F.; Wolf-Gladrow, D.; Cisewski, B.; Savoye, N.; André, L.; Cardinal, D.</b> (2011). Silicon uptake and supply during a Southern Ocean iron fertilization experiment (EIFEX) tracked by Si isotopes. <i>Limnol. Oceanogr. 56(1)</i>: 147-160. <a href=\"http://dx.doi.org/10.4319/lo.2011.56.1.0147\" target=\"_blank\">dx.doi.org/10.4319/lo.2011.56.1.0147</a>","BEntID":203114,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Limnol. Oceanogr. 56(1)</i>: 147-160. <a href=\"https://dx.doi.org/10.4319/lo.2011.56.1.0147\" target=\"_blank\">https://dx.doi.org/10.4319/lo.2011.56.1.0147</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Cavagna, A.J.; Fripiat, F.; Dehairs, F.; Wolf-Gladrow, D.; Cisewski, B.; Savoye, N.; André, L.; Cardinal, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Cavagna, A.J. <i>et al.</i>","Englishabstract":"We studied the evolution of the isotopic composition of dissolved Si (d<sup>30</sup>Si<sub>DSi</sub>) and biogenic Si (d<sup>30</sup>Si<sub>BSi</sub>) during a diatom bloom induced by an iron fertilization experiment in a Southern Ocean (SO) eddy. Dissolved Si (DSi) consumption was clearly boosted as a result of iron addition. We estimate an apparent Si isotopic fractionation factor of -1.36 parts per thousand +/- 0.11 parts per thousand, not significantly different from estimates based on in vitro incubations under Fe-replete conditions and in agreement with previous SO studies under Fe-depleted conditions. The temporal variations of the d<sup>30</sup>Si are best reconstructed considering the fertilized surface waters as an open system, i.e., DSi is continuously supplied from the winter water. Using vertical diffusivity, we estimate a supply of 6.7 +/- 1.2 mmol Si m<sup>-2</sup> d<sup>-1</sup> representing 30% +/- 5% of total DSi demand. We estimate biogenic silica (BSi) production at 22.1 +/- 1.8 mmol Si m<sup>-2</sup> d<sup>-1</sup>, similar to BSi production under natural conditions in the SO. The DSi use preceding the start of the fertilization was conservatively estimated at 49% +/- 4%, and as a result of the Fe-fertilization, a further 31% +/- 4% of the initial DSi reservoir was consumed. The BSi export was estimated to be 17.4 +/- 1.7 mmol Si m<sup>-2</sup> d<sup>-1</sup>. Our results suggest that for this study three main processes were acting significantly on d<sup>30</sup>Si signatures, biological uptake, Si supply from subsurface, and export of BSi, and that the magnitude of production and export in such a Fe-fertilized experiment are similar to those for natural diatom blooms occurring in the Southern Ocean.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Silicon uptake and supply during a Southern Ocean iron fertilization experiment (EIFEX) tracked by Si isotopes","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":2011,"MonPub":null,"DateUpdate":"2012-06-08","DateCreate":"2011-12-22","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000290677200013","VABBcode":null,"OpenAcc":0,"DOI":"10.4319/lo.2011.56.1.0147"},"refs":null,"anarec":{"AnaID":211192,"PubliDate":2011,"Pagination":"147-160","XtraPublOfAnaID":null,"ISBN":null,"Volume":"56","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43511,"SerRR":"Limnology and Oceanography. 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