{"refrec":{"BRefID":238153,"RR":"<b>Benavides, M.; Aristegui, J.; Agawin, N.S.R.; Alvarez-Salgado, X.A.; Alvarez, M.; Troupin, C.</b> (2013). Low contribution of N<sub>2</sub> fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin. <i>Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 81</i>: 36-48. <a href=\"http://dx.doi.org/10.1016/j.dsr.2013.07.004\" target=\"_blank\">dx.doi.org/10.1016/j.dsr.2013.07.004</a>","BEntID":229840,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 81</i>: 36-48. <a href=\"https://dx.doi.org/10.1016/j.dsr.2013.07.004\" target=\"_blank\">https://dx.doi.org/10.1016/j.dsr.2013.07.004</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Benavides, M.; Aristegui, J.; Agawin, N.S.R.; Alvarez-Salgado, X.A.; Alvarez, M.; Troupin, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Benavides, M. <i>et al.</i>","Englishabstract":"We used <sup>15</sup>N-labeled substrates to measure dinitrogen (N<sub>2</sub>) fixation, nitrate (NO<sub>3</sub><sup>-</sup>) and ammonium (NH<sub>4</sub><sup>+</sup>) uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ~31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew=NO<sub>3</sub><sup>-</sup> uptake+N<sub>2</sub> fixation+DON released from NO<sub>3</sub><sup>-</sup> uptake-NO<sub>3</sub><sup>-</sup> regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L<sup>-1</sup> h<sup>-1</sup>, respectively), while regenerated production (Preg=NH<sub>4</sub><sup>+</sup> uptake+DON released from NH<sub>4</sub><sup>+</sup> uptake+NH<sub>4</sub><sup>+</sup> regeneration) was similar in both zones (0.157 and 0.133 µmol N L<sup>-1</sup> h<sup>-1</sup>, respectively). The resulting <i>f</i> -ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N<sub>2</sub> fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×10<sup>10</sup> mol N yr<sup>-1</sup>. We revisited this budget including new dissolved organic matter and NO<sub>3</sub><sup>-</sup>fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×10<sup>10</sup> mol N yr<sup>-1</sup>. The average volumetric rate of N<sub>2</sub> fixation for this zone was only 1.3×10<sup>-3</sup> nmol N L<sup>-1</sup> d<sup>-1</sup>, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Low contribution of N<sub>2</sub> fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin","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":"New production; Regenerated production; f-Ratio; Diazotrophy; Upwelling;Dissolved organic nitrogen release","OtherDescriptors":null,"Notes":null,"AnaPub":2013,"MonPub":null,"DateUpdate":"2015-10-29","DateCreate":"2014-05-18","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000325738100004","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.dsr.2013.07.004"},"refs":null,"anarec":{"AnaID":238153,"PubliDate":2013,"Pagination":"36-48","XtraPublOfAnaID":null,"ISBN":null,"Volume":"81","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45506,"SerRR":"Deep-Sea Research, Part I. 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