{"refrec":{"BRefID":354024,"RR":"<b>Deman, F.; Fonseca-Batista, D.; Roukaerts, A.; García-Ibáñez, M.I.; Le Roy, E.; Thilakarathne, E.P.D.N.; Elskens, M.; Dehairs, F.; Fripiat, F.</b> (2021). Nitrate supply routes and impact of internal cycling in the North Atlantic Ocean inferred From nitrate isotopic composition. <i>Global Biogeochem. Cycles 35(4)</i>: e2020GB006887. <a href=\"https://dx.doi.org/10.1029/2020GB006887\" target=\"_blank\">https://dx.doi.org/10.1029/2020GB006887</a>","BEntID":351737,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Global Biogeochem. Cycles 35(4)</i>: e2020GB006887. <a href=\"https://dx.doi.org/10.1029/2020GB006887\" target=\"_blank\">https://dx.doi.org/10.1029/2020GB006887</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Deman, F.; Fonseca-Batista, D.; Roukaerts, A.; García-Ibáñez, M.I.; Le Roy, E.; Thilakarathne, E.P.D.N.; Elskens, M.; Dehairs, F.; Fripiat, F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Deman, F. <i>et al.</i>","Englishabstract":"In this study we report full-depth water column profiles for nitrogen and oxygen isotopic composition (δ<sup>15</sup>N and δ<sup>18</sup>O) of nitrate (NO<sub>3</sub><sup>−</sup>) during the GEOTRACES GA01 cruise (2014). This transect intersects the double gyre system of the subtropical and subpolar regions of the North Atlantic separated by a strong transition zone, the North Atlantic Current. The distribution of NO<sub>3</sub><sup>−</sup> δ<sup>15</sup>N and δ<sup>18</sup>O shows that assimilation by phytoplankton is the main process controlling the NO<sub>3</sub><sup>−</sup> isotopic composition in the upper 150&nbsp;m, with values increasing in a NO<sub>3</sub><sup>−</sup> δ<sup>18</sup>O versus δ<sup>15</sup>N space along a line with a slope of one toward the surface. In the subpolar gyre, a single relationship between the degree of NO<sub>3</sub><sup>−</sup> consumption and residual NO<sub>3</sub><sup>−</sup> δ<sup>15</sup>N supports the view that NO<sub>3</sub><sup>−</sup> is supplied via Ekman upwelling and deep winter convection, and progressively consumed during the Ekman transport of surface water southward. The co-occurrence of partial NO<sub>3</sub><sup>−</sup> assimilation and nitrification in the deep mixed layer of the subpolar gyre elevates subsurface NO<sub>3</sub><sup>−</sup> δ<sup>18</sup>O in comparison to deep oceanic values. This signal propagates through isopycnal exchanges to greater depths at lower latitudes. With recirculation in the subtropical gyre, cycles of quantitative consumption-nitrification progressively decrease subsurface NO<sub>3</sub><sup>−</sup> δ<sup>18</sup>O toward the δ<sup>18</sup>O of regenerated NO<sub>3</sub><sup>−</sup>. The low NO<sub>3</sub><sup>−</sup> δ<sup>15</sup>N observed south of the Subarctic Front is mostly explained by N<sub>2</sub> fixation, although a contribution from the Mediterranean outflow is required to explain the lower NO<sub>3</sub><sup>−</sup> δ<sup>15</sup>N signal observed between 600 and 1500&nbsp;m depth close to the Iberian margin.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Nitrate supply routes and impact of internal cycling in the North Atlantic Ocean inferred From nitrate isotopic composition","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-17 01:32:45.401058","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Atlantic; isotopy; nitrate","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2022-07-27","DateCreate":"2022-07-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000644999800016","VABBcode":null,"OpenAcc":0,"DOI":"10.1029/2020GB006887"},"refs":null,"anarec":{"AnaID":354024,"PubliDate":2021,"Pagination":"e2020GB006887","XtraPublOfAnaID":null,"ISBN":null,"Volume":"35","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45841,"SerRR":"Global Biogeochemical Cycles. 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