Timescale of reduction of long-term phosphorus release from sediment in lakes

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dc.contributor.authorRippey, Brian
dc.contributor.authorCampbell, Julie
dc.contributor.authorMcElarney, Yvonne
dc.contributor.authorThompson, James
dc.contributor.authorGallagher, Mary
dc.date.accessioned2021-09-28T14:34:38Z
dc.date.available2021-09-28T14:34:38Z
dc.date.issued2021-05-25
dc.descriptionPublication history: Accepted - 19 May 2021; Published online - 25 May 2021.en_US
dc.description.abstractIt is important for lake management and policy to estimate the timescale of recovery from long-term P release from sediment after a reduction in the external load. To provide a scientific basis for this, a condensed model was elaborated, applied and evaluated in four lakes. The model is based on first order kinetics, with an overall rate constant composed of the rate of diagenesis of labile P (kd,2) and rate of burial of P (kb) below an active sediment layer. Using the variation of P fractions in dated sediment cores, kd,2 varied from 0.0155 to 0.383 yr−1, kb from 0.0184 to 0.073 yr−1 and the overall rate constant from 0.0230 to 0.446 yr−1. The active layer depths, 8 to 29 cm, and kd,2 values are within the ranges found by others. The time for a 75% reduction (t75) of labile P in the active layer is 60 years in Lough Melvin, 3 in Ramor, 33 in Sheelin and 41 in Neagh, although P release is only important in Ramor and Neagh. Combining the kd,2 values with other estimates (mean 0.0981 yr−1, median 0.0426; n=14) produces a t75 value of less than 14 and 33 years. A review of other models indicates a timescale of one to two decades and from lake monitoring also of one to two decades. It is desirable to estimate the timescale directly in all lakes if sediment P release is important, but, generally, it should take between one and three decades.en_US
dc.description.sponsorshipEnvironmental Protection Agency of Ireland; Department for Agriculture, Environment and Rural Affairs in Northern Irelanden_US
dc.identifierhttp://hdl.handle.net/20.500.12518/355
dc.identifier.citationRippey, B., Campbell, J., McElarney, Y., Thompson, J. and Gallagher, M. (2021) ‘Timescale of reduction of long-term phosphorus release from sediment in lakes’, Water Research, 200, p. 117283. doi: 10.1016/j.watres.2021.117283.en_US
dc.identifier.issn0043-1354
dc.identifier.urihttps://doi.org/10.1016/j.watres.2021.117283
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rightsCopyright 2021 Elsevier. This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.en_US
dc.subjectRecoveryen_US
dc.subjectModelen_US
dc.subjectDiagenesisen_US
dc.subjectBurialen_US
dc.titleTimescale of reduction of long-term phosphorus release from sediment in lakesen_US
dc.typeArticleen_US

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