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dc.contributor.authorNisbeth, Catharina Simone
dc.contributor.authorKidmose, Jacob
dc.contributor.authorWeckström, Kaarina
dc.contributor.authorReitzel, Kasper
dc.contributor.authorOdgaard, Bent Vad
dc.contributor.authorBennike, Ole
dc.contributor.authorThorling, Lærke
dc.contributor.authorMcGowan, Suzanne
dc.contributor.authorSchomacker, Anders
dc.contributor.authorKristensen, David Lajer Juul
dc.contributor.authorJessen, Søren
dc.date.accessioned2019-10-25T11:10:15Z
dc.date.available2019-10-25T11:10:15Z
dc.date.issued2019-10-24
dc.description.abstractThe general perception has long been that lake eutrophication is driven by anthropogenic sources of phosphorus (P) and that P is immobile in the subsurface and in aquifers. Combined investigation of the current water and P budgets of a 70 ha lake (Nørresø, Fyn, Denmark) in a clayey till-dominated landscape and of the lake’s Holocene trophic history demonstrates a potential significance of geogenic (natural) groundwater-borne P. Nørresø receives water from nine streams, a groundwater-fed spring located on a small island, and precipitation. The lake loses water by evaporation and via a single outlet. Monthly measurements of stream, spring, and outlet discharge, and of tracers in the form of temperature, δ<sup>18</sup>O and δ<sup>2</sup>H of water, and water chemistry were conducted. The tracers indicated that the lake receives groundwater from an underlying regional confined glaciofluvial sand aquifer via the spring and one of the streams. In addition, the lake receives a direct groundwater input (estimated as the water balance residual) via the lake bed, as supported by the artesian conditions of underlying strata observed in piezometers installed along the lake shore and in wells tapping the regional confined aquifer. The groundwater in the regional confined aquifer was anoxic, ferrous, and contained 4–5 µmol/L dissolved inorganic orthophosphate (DIP). Altogether, the data indicated that groundwater contributes from 64% of the water-borne external DIP loading to the lake, and up to 90% if the DIP concentration of the spring, as representative for the average DIP of the regional confined aquifer, is assigned to the estimated groundwater input. In support, paleolimnological data retrieved from sediment cores indicated that Nørresø was never P-poor, even before the introduction of agriculture at 6000 years before present. Accordingly, groundwater-borne geogenic phosphorus can have an important influence on the trophic state of recipient surface water ecosystems, and groundwater-borne P can be a potentially important component of the terrestrial P cycle.en_US
dc.descriptionSource at <a href=https://doi.org/10.3390/w11112213>https://doi.org/10.3390/w11112213. </a>en_US
dc.identifier.citationNisbeth, C.S., Kidmose, J., Weckström, K., Reitzel, K., Odgaard, B.V., Bennike, O. ... Jessen, S. (2019). Dissolved Inorganic Geogenic Phosphorus Load to a Groundwater-Fed Lake: Implications of Terrestrial Phosphorus Cycling by Groundwater. <i>Water, 11</i>(11), 2213. https://doi.org/10.3390/w11112213en_US
dc.identifier.cristinIDFRIDAID 1740399
dc.identifier.doi10.3390/w11112213
dc.identifier.issn2073-4441
dc.identifier.urihttps://hdl.handle.net/10037/16475
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.relation.journalWater
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectgeogenic phosphorusen_US
dc.subjectdissolved inorganic orthophosphateen_US
dc.subjecttransporten_US
dc.subjecteutrophicationen_US
dc.subjectgroundwater-surface water interactionen_US
dc.titleDissolved Inorganic Geogenic Phosphorus Load to a Groundwater-Fed Lake: Implications of Terrestrial Phosphorus Cycling by Groundwateren_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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