Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/80376
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dc.contributor.authorBaltar, Federico-
dc.contributor.authorArístegui, Javier-
dc.contributor.authorSintes, Eva-
dc.contributor.authorGasol, Josep M.-
dc.contributor.authorReinthaler, Thomas-
dc.contributor.authorHerndl, Gerhard J.-
dc.date.accessioned2013-07-31T06:24:18Z-
dc.date.available2013-07-31T06:24:18Z-
dc.date.issued2010-05-
dc.identifierdoi: 10.1029/2010GL043105-
dc.identifierissn: 0094-8276-
dc.identifiere-issn: 1944-8007-
dc.identifier.citationGeophysical Research Letters 37(9): L09602 (2010)-
dc.identifier.urihttp://hdl.handle.net/10261/80376-
dc.description6 pages, 1 figure, 2 tables-
dc.description.abstractIt is generally assumed that sinking particulate organic carbon (POC) constitutes the main source of organic carbon supply to the deep ocean¡̄s food webs. However, a major discrepancy between the rates of sinking POC supply (collected with sediment traps) and the prokaryotic organic carbon demand (the total amount of carbon required to sustain the heterotrophic metabolism of the prokaryotes; i.e., production plus respiration, PCD) of deep-water communities has been consistently reported for the dark realm of the global ocean. While the amount of sinking POC flux declines exponentially with depth, the concentration of suspended, buoyant non-sinking POC (nsPOC; obtained with oceanographic bottles) exhibits only small variations with depth in the (sub)tropical Northeast Atlantic. Based on available data for the North Atlantic we show here that the sinking POC flux would contribute only 4̈C12% of the PCD in the mesopelagic realm (depending on the primary production rate in surface waters). The amount of nsPOC potentially available to heterotrophic prokaryotes in the mesopelagic realm can be partly replenished by dark dissolved inorganic carbon fixation contributing between 12% to 72% to the PCD daily. Taken together, there is evidence that the mesopelagic microheterotrophic biota is more dependent on the nsPOC pool than on the sinking POC supply. Hence, the enigmatic major mismatch between the organic carbon demand of the deep-water heterotrophic microbiota and the POC supply rates might be substantially smaller by including the potentially available nsPOC and its autochthonous production in oceanic carbon cycling models-
dc.description.sponsorshipThis research was supported by a predoctoral Fellowship of the Spanish Ministry of Education and Science (AP2005‐3932) to F.B., a grant of the Earth and Life Science Division of the Dutch Science Foundation (ALW‐NWO; ARCHIMEDES project, 835.20.023) to G.J.H. and a grant of the Spanish Ministry of Education and Science to J. A. (Remolinos Oceánicos y Deposiciones Atmosféricas (RODA) project; CTM 2004‐06842‐C03/MAR). The work was carried out within the frame of the EU ‘Networks of Excellence’ MarBef and EurOceans-
dc.language.isoeng-
dc.publisherAmerican Geophysical Union-
dc.rightsopenAccess-
dc.titleSignificance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic-
dc.typeartículo-
dc.identifier.doi10.1029/2010GL043105-
dc.relation.publisherversionhttps://doi.org/10.1029/2010GL043105-
dc.date.updated2013-07-31T06:24:18Z-
dc.description.versionPeer Reviewed-
item.fulltextWith Fulltext-
item.openairetypeartículo-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextopen-
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