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dc.contributor.authorAnderson, T.en_US
dc.contributor.authorCropp, Rogeren_US
dc.contributor.authorGabric, Alberten_US
dc.contributor.authorPacheco, J.en_US
dc.contributor.authorSimo, R.en_US
dc.contributor.authorVallina, S.en_US
dc.date.accessioned2017-04-04T14:45:34Z
dc.date.available2017-04-04T14:45:34Z
dc.date.issued2008en_US
dc.date.modified2010-11-03T07:03:28Z
dc.identifier.issn01480227en_US
dc.identifier.doi10.1029/2007JG000415en_AU
dc.identifier.urihttp://hdl.handle.net/10072/23703
dc.description.abstractA new one-dimensional model of DMSP/DMS dynamics (DMOS) is developed and applied to the Sargasso Sea in order to explain what drives the observed dimethylsulfide (DMS) summer paradox: a summer DMS concentration maximum concurrent with a minimum in the biomass of phytoplankton, the producers of the DMS precursor dimethylsulfoniopropionate (DMSP). Several mechanisms have been postulated to explain this mismatch: a succession in phytoplankton species composition towards higher relative abundances of DMSP producers in summer; inhibition of bacterial DMS consumption by ultraviolet radiation (UVR); and direct DMS production by phytoplankton due to UVR-induced oxidative stress. None of these hypothetical mechanisms, except for the first one, has been tested with a dynamic model. We have coupled a new sulfur cycle model that incorporates the latest knowledge on DMSP/DMS dynamics to a preexisting nitrogen/carbon-based ecological model that explicitly simulates the microbial-loop. This allows the role of bacteria in DMS production and consumption to be represented and quantified. The main improvements of DMOS with respect to previous DMSP/DMS models are the explicit inclusion of: solar-radiation inhibition of bacterial sulfur uptakes; DMS exudation by phytoplankton caused by solar-radiation-induced stress; and uptake of dissolved DMSP by phytoplankton. We have conducted a series of modeling experiments where some of the DMOS sulfur paths are turned "off" or "on," and the results on chlorophyll-a, bacteria, DMS, and DMSP (particulate and dissolved) concentrations have been compared with climatological data of these same variables. The simulated rate of sulfur cycling processes are also compared with the scarce data available from previous works. All processes seem to play a role in driving DMS seasonality. Among them, however, solar-radiation-induced DMS exudation by phytoplankton stands out as the process without which the model is unable to produce realistic DMS simulations and reproduce the DMS summer paradox.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent1102627 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherAmerican Geophysical Unionen_US
dc.publisher.placeWashington DCen_US
dc.publisher.urihttp://www.agu.org/journals/jd/en_AU
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom1en_US
dc.relation.ispartofpageto18en_US
dc.relation.ispartofjournalJournal of Geophysical Research (Biogeosciences)en_US
dc.relation.ispartofvolume113en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchMulti-Disciplinaryen_US
dc.subject.fieldofresearchcode999999en_US
dc.titleA dynamic model of oceanic sulfur (DMOS) applied to the Sargasso Sea: Simulating the dimethylsulfide (DMS) summer paradox.en_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2008 American Geophysical Union. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_AU
gro.date.issued2008
gro.hasfulltextFull Text


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