{"refrec":{"BRefID":9370,"RR":"<b>Hoepffner, N.; Sathyendranath, S.; Platt, T.</b> (1989). La productivité des océans: vers une approche dynamique pluridisciplinaire, <b><i>in</i></b>: Denis, M. (Ed.) <i>Océanologie: actualité et prospective.</i> pp. 339-366","BEntID":9370,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Denis, M. (Ed.) <i>Océanologie: actualité et prospective.</i> pp. 339-366","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hoepffner, N.; Sathyendranath, S.; Platt, T.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Hoepffner, N.; Sathyendranath, S.; Platt, T.","Englishabstract":"There has been, of late, an increased interest in quantifying the global oceanic primary production, in view of its role in mediating the climate response to excess carbon dioxide in the atmosphere. In this context, it is also important to know the ratio «f», which defines the exportable fraction of primary production. The f-ratio is usually determined in terms of the components of the nitrogen cycle. Intercomparison of large-scale estimates of primary production based on carbon, nitrogen and oxygen cycles often show significant differences. It is argued that one of the principal causes for this discrepancy is gross undersampling, and consequent problem with interpolating and extrapolating the results to time and space scales not covered by the observation program. Examples are shown to demonstrate that primary production and f- ratio vary markedly in response to changes in physical forcing ranging from the microscale through mesoscale to large scale. Biologic control of primary production takes place through variations in the structure of the pelagic food chain. The optical approach to primary production is also important, since it offers the possibility of large-scale estimates through remote sensing. In conclusion, studies of oceanic production call for an integrated multi-disciplinary approach.","AbstractOtherLang":"L'intérêt de plus en plus évident de quantifier la production primaire océanique au sens global est suscité par la fonction importante des organismes marins affectant significativement la réponse climatique a l'exces de CO<sub>2</sub> dans l'atmosphère. Dans ce contexte, le coefficient «f» est aussi capital puisqu'il définit la proportion de la production primaire totale exportable dans les profondeurs océaniques. La comparaison des estimations de la productivité océanique établies à partir des différents cycles géochimiques (oxygene, azote, carbone) entraîne des interprétations souvent contradictoires. De toute évidence, l'origine de ces erreurs provient d'un sous-échantillonnage flagrant dans le domaine spatio-temporel qui correspond à la variabilité des processus biologiques. Dans ce chapitre, nous présentons quelques exemples qui démontrent clairement la grande variabilité à la fois de la production primaire totale et du coefficient «f» en réponse aux fluctuations à petite et grande échelles de l'environnement physique. Par ailleurs, un contrôle biologique de la production primaire se manifeste à travers la structure de la chaine alimentaire pélagique et par la non-linéarité du flux de matière entre ses différentes composantes. Enfin, la production primaire dans les océans est limitée par certaines propriétés optiques du milieu. Nous mettons en évidence l'avantage d'un modèle optique pour estimer la production photosynthétique à partir des données acquises par télédétection, unique. moyen d'échantillonnage à grande échelle: En fin de compte, le rôle du biotope marin dans le cycle global du carbone ne peut donc être évalué que par une approche intégrée mettant en cause plusieurs disciplines scientifiques.","BibLvlCode":"AM","StandardTitle":"La productivité des océans: vers une approche dynamique pluridisciplinaire","OrigTitleLangCode":"fr","OrigTitleLangCodeExtended":"fre","OrigTitleLangID":22,"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":1989,"MonPub":null,"DateUpdate":"2001-05-18","DateCreate":"2001-05-18","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":9370,"PubliDate":1989,"Pagination":"339-366","XtraPublOfAnaID":null,"ISBN":"2-907752-00-6","Volume":null,"Issue":null,"BRefMon":9352,"BRefMonRR":"<b>Denis, M. 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