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Worldwide retention of nutrient silicon by river damming: From sparse data set to global estimate

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dc.contributor.authorMaavara, Taylor
dc.contributor.authorDürr, Hans H.
dc.contributor.authorVan Cappellen, Philippe
dc.date.accessioned2017-05-25T15:09:44Z
dc.date.available2017-05-25T15:09:44Z
dc.date.issued2014-08-13
dc.description© American Geophysical Unionen
dc.description.abstractDamming of rivers represents a major anthropogenic perturbation of the hydrological cycle, with the potential to profoundly modify the availability of nutrient silicon (Si) in streams, lakes, and coastal areas. A global assessment of the impact of dams on river Si fluxes, however, is limited by the sparse data set on Si budgets for reservoirs. To alleviate this limitation, we use existing data on dissolved Si (DSi) retention by dams to calibrate a mechanistic model for the biogeochemical cycling of DSi and reactive particulate Si (PSi) in reservoir systems. The model calibration yields a relationship between the annual in-reservoir siliceous primary productivity and the external DSi supply. With this relationship and an estimate of catchment Si loading, the model calculates the total reactive Si (RSi=DSi+PSi) retention for any given reservoir. A Monte Carlo analysis accounts for the effects of variations in reservoir characteristics and generates a global relationship that predicts the average reactive Si retention in reservoirs as a function of the water residence time. This relationship is applied to the Global Reservoirs and Dams database to estimate Si retention by damming worldwide. According to the results, dams retain 163 Gmol yr(-1) (9.8 Tg SiO2 yr(-1)) of DSi and 372 Gmol yr(-1) (22.3 Tg SiO2 yr(-1)) of RSi, or 5.3% of the global RSi loading to rivers.en
dc.description.sponsorshipCanada Excellence Research Chair (CERC) program; Ontario Graduate Scholarships (OGS) programen
dc.identifier.urihttp://dx.doi.org/10.1002/2014GB004875
dc.identifier.urihttp://hdl.handle.net/10012/11957
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.subjectGate-I Reservoiren
dc.subjectBiogenic Silicaen
dc.subjectDanube Riveren
dc.subjectLake-Michiganen
dc.subjectFresh-Wateren
dc.subjectAmorphous Silicaen
dc.subjectDissolved Silicaen
dc.subjectOrganic-Matteren
dc.subjectLough-Neaghen
dc.subjectDiatomen
dc.titleWorldwide retention of nutrient silicon by river damming: From sparse data set to global estimateen
dc.typeArticleen
dcterms.bibliographicCitationMaavara, T., Dürr, H. H., & Van Cappellen, P. (2014). Worldwide retention of nutrient silicon by river damming: From sparse data set to global estimate. Global Biogeochemical Cycles, 28(8), 842–855. https://doi.org/10.1002/2014GB004875en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.typeOfResourceTexten
uws.typeOfResourceTexten

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