{"refrec":{"BRefID":127844,"RR":"<b>Karl, D.M.; Letelier, R.M.</b> (2008). Nitrogen fixation-enhanced carbon sequestration in low nitrate, low chlorophyll seascapes. <i>Mar. Ecol. Prog. Ser. 364</i>: 257-268. <a href=\"http://dx.doi.org/10.3354/meps07547\" target=\"_blank\">http://dx.doi.org/10.3354/meps07547</a>","BEntID":121929,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 364</i>: 257-268. <a href=\"https://dx.doi.org/10.3354/meps07547\" target=\"_blank\">https://dx.doi.org/10.3354/meps07547</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Karl, D.M.; Letelier, R.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Karl, D.M.; Letelier, R.M.","Englishabstract":"The magnitude of fluxes in the carbon cycle of subtropical and tropical marine habitats is determined by the supply of inorganic nutrients. These habitats have low sea-surface concentrations of nitrate (NO3-) and chlorophyll (dubbed LNLC regions), sustain relatively low rates of organic matter production and export, and represent global ocean minima in carbon sequestration potential. The low NO3- resupply should select for nitrogen (N-2)-fixing bacteria, termed diazotrophs, provided all other growth-limiting nutrients are available. Several recent field efforts have been aimed at enhancing N-2 fixation in LNLC regions through mesoscale fertilization with iron and phosphorus (or both) and we hypothesize herein that controlled upwelling of nutrient-enriched deep water may also be effective. Based on a quantitative assessment of the vertical distribution of N-O(3)-, phosphate (PO43-) and dissolved inorganic carbon (DIC) at Station ALOHA (22 degrees 45' N, 158 degrees W), we hypothesize that the process of controlled upwelling of low NO3-:PO43- seawater may lead to enhanced N2 fixation, organic matter production and net carbon sequestration. Furthermore, based on a long-term (20 yr) data set from Station ALOHA, we predict that the upwelling of water from a depth of 300 to 350 m during summer months will trigger a 2-stage phytoplankton bloom. The first stage will be characterized by a NO3--supported Redfield ratio (e.g. C-106:N-16:P by atoms) diatom bloom. Following quantitative NO3- removal, the residual PO43- from the low N:P (<16:1) upwelled nutrient pulse will stimulate a N-2-fixing bacterial bloom, leading to net sequestration of carbon. However, any strategic benefit of controlled upwelling for enhancing the long-term carbon sequestration will depend on the spatial and temporal uncoupling of organic matter production and remineralization, which is ultimately controlled by the microbial response to these perturbations.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Nitrogen fixation-enhanced carbon sequestration in low nitrate, low chlorophyll seascapes","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":"N-2 fixation; diazotroph; nutrients; carbon sequestration; North Pacificgyre","OtherDescriptors":null,"Notes":null,"AnaPub":2008,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2008-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000258810800025","VABBcode":null,"OpenAcc":1,"DOI":"10.3354/meps07547"},"refs":null,"anarec":{"AnaID":127844,"PubliDate":2008,"Pagination":"257-268","XtraPublOfAnaID":null,"ISBN":null,"Volume":"364","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. 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