{"refrec":{"BRefID":210837,"RR":"<b>Lannuzel, D.; Bowie, A.R.; Remenyi, T.; Lam, P.; Townsend, A.; Ibisanmi, E.; Butler, E.; Wagener, T.; Schoemann, V.</b> (2011). Distributions of dissolved and particulate iron in the sub-Antarctic and Polar Frontal Southern Ocean (Australian sector). <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 58(21-22)</i>: 2094-2112. <a href=\"http://dx.doi.org/10.1016/j.dsr2.2011.05.027\" target=\"_blank\">dx.doi.org/10.1016/j.dsr2.2011.05.027</a>","BEntID":202759,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 58(21-22)</i>: 2094-2112. <a href=\"https://dx.doi.org/10.1016/j.dsr2.2011.05.027\" target=\"_blank\">https://dx.doi.org/10.1016/j.dsr2.2011.05.027</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Lannuzel, D.; Bowie, A.R.; Remenyi, T.; Lam, P.; Townsend, A.; Ibisanmi, E.; Butler, E.; Wagener, T.; Schoemann, V.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lannuzel, D. <i>et al.</i>","Englishabstract":"This paper presents iron (Fe) profiles in the upper 1000 m from nine short-term (transect) stations and three long-term (process) stations occupied in the Australian sector of the Southern Ocean during the SAZ-Sense expedition in austral summer (January-February) 2007. Strong vertical and horizontal gradients in Fe concentrations were observed between the 18 sampled profiles (i.e. 0.09-0.63 nmol/l dissolved Fe (dFe)). Average dFe concentrations in surface gggwaters in the northern Sub-Antarctic Zone (SAZ-N) West (station P1) were 0.27 +/- 0.04 nmol/l. This is lower in the SAZ-N East region (station P3 and around) where average dFe values in the mixed layer were 0.48 +/- 0.10 nmol/l. The Polar Front (PF) station (P2) exhibited the lowest average surface Fe values (i.e., 0.22 +/- 0.02 nmol/l). Iron concentrations in deep waters down to 1000 m were more uniform (0.25-0.37 nmol/l dFe), which is in accordance with values reported elsewhere in remote waters of the Southern Ocean, but lower than those observed in the North Atlantic and North Pacific basins. A strong decoupling was observed between dFe and nutrient cycles at all stations. Particulate Fe levels were generally very low for all SAZ stations ( <0.08-1.38 nmol/l), with higher values observed at stations collected near Tasmania and in the SAZ-N East region. The intrusion of subtropical waters, enriched with Fe from sediments or dust further north, is thought to mediate Fe input to the SAZ-N and STZ areas, while input from below would be the main source of Fe in the PF region. We applied the tracer Fe* (Fe*= [dFe] - R(Fe:p) x [PO<sub>4</sub><sup>3-</sup>] where R(Fe:P) is the algal uptake ratio) to estimate the degree to which the water masses were Fe limited. In this study, Fe* tended to be negative and decreased with increasing depths and latitude. Positive Fe* values. indicating Fe sufficiency, were observed in the (near-)surface waters collected in the SAZ-N East and near continental sources, where primary production was higher and ultimately limited by the lack of macro-nutrients, not Fe. Micro-organisms residing in the SAZ-N West and PF on the other hand experienced negative Fe*, indicating a strong co-limitation by low silicic acid concentration and Fe supply (and light in the case of PF).","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Distributions of dissolved and particulate iron in the sub-Antarctic and Polar Frontal Southern Ocean (Australian sector)","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":"Iron; Distributions; Macro-nutrients; Biogeochemistry; Southern Ocean","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:000295762400005","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.dsr2.2011.05.027"},"refs":null,"anarec":{"AnaID":210837,"PubliDate":2011,"Pagination":"2094-2112","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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