Nitrogen exchange at the continental margin: a numerical study of the Gulf of Mexico.

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dc.acquisition-srcen_US
dc.call-noAcc# 4803en_US
dc.contract-noen_US
dc.contributor.authorWalsh, J.J.en_US
dc.contributor.authorDieterle, D.A.en_US
dc.contributor.authorMeyers, M.B.en_US
dc.contributor.authorMuller-Karger, F.E.en_US
dc.contributor.otherProgress in Oceanographyen_US
dc.date.accessioned2010-02-15T17:10:36Z
dc.date.available2010-02-15T17:10:36Z
dc.date.issued1989en_US
dc.degreeen_US
dc.descriptionp. 245-301en_US
dc.description-otheren_US
dc.description.abstractA two-layered baroclinic circulation model and a 21-layered biochemical model are used to explore the consequences of Loop Current - induced upwelling and terrestrial eutrophication on new production within the Gulf of Mexico. During a quasi-annual penetration and eddy-shedding cycle of the Loop Current, the simulated seasonal changes of incident radiation, wind stress, and surface mixed layer depth induce an annual cycle of algal biomass that corresponds to in situ and satellite time series of chlorophyll. The simulated nitrate fields match those of shipboard surveys, while fallout of particulate matter approximates that caught in sediment traps and accumulating in bottom sediments. Assuming an f ratio of 0.06-0.12, the total primary production of the Gulf of Mexico might be 105-210g C/(m squared)(year) in the absence of anthropogenic nutrient loadings, i.e. 2-3 fold that of oligotrophic regions not impacted by western boundary currents. Less than 25% of the nitrogen effluent of the Mississippi River may be stored in bottom sediments, with most of this input dispersed in dissolved form beneath the pycnocline, after remineralization of particulate detritus within several production cycles derived from riverine loading. At a sinking rate of 3m/d, however, sufficient phytodetritus survives oxidation in the water column to balance estimates of bottom metabolism and burial at the margins.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGulf of Mexicoen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/22518
dc.latitudeen_US
dc.locationGalveston Bay Collection; TAMUG periodical collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries4803.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectnitrogenen_US
dc.subjectnitrogen cycleen_US
dc.subjectbiogeochemical cycleen_US
dc.subjectbiodegradationen_US
dc.subjectnitrogen fixationen_US
dc.subjectparticulate organic nitrogenen_US
dc.subjectparticulate organic matteren_US
dc.subjectsediment analysisen_US
dc.subjectsediment compositionen_US
dc.subjectsedimentsen_US
dc.subjectsediment samplesen_US
dc.titleNitrogen exchange at the continental margin: a numerical study of the Gulf of Mexico.en_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue23en_US

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