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Nutrient loadings from urban catchments under climate change scenarios: Case studies in Stockholm, Sweden
KTH, Industriell ekologi.ORCID iD: 0000-0002-2829-2928
KTH, Industriell ekologi.ORCID iD: 0000-0002-4530-3414
2015 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 518-519, p. 393-406Article in journal (Refereed) Published
Abstract [en]

Anthropogenic nutrient emissions and associated eutrophication of urban lakes are a global problem. Future changes in temperature and precipitation may influence nutrient loadings in lake catchments. A coupling method, where the Generalized Watershed Loading Functions method was tested in combination with source quantification in a Substance Flow Analysis structure, was suggested to investigate diffuse nutrient sources and pathways and climate change effects on the loadings to streamflow in urban catchments. This method may, with an acceptable level of uncertainty, be applied to urban catchments for first-hand estimations of nutrient loadings in the projected future and to highlight the need for further study and monitoring. Five lake catchments in Stockholm, Sweden (Råcksta Träsk, Judarn, Trekanten, Långsjön and Laduviken) were employed as case studies and potential climate change effects were explored by comparing loading scenarios in two periods (2000-2009 and 2021-2030). For the selected cases, the dominant diffuse sources of nutrients to urban streamflow were found to be background atmospheric concentration and vehicular traffic. The major pathways of the nitrogen loading were suggested to be from both developed areas and natural areas in the control period, while phosphorus was indicated to be largely transported through surface runoff from natural areas. Furthermore, for nitrogen, a modest redistribution of loadings from surface runoff and stormwater between seasons and an increase in the annual loading were suggested for the projected future climate scenarios as compared to the control period. The model was, due to poor monitoring data availability, only able to set an upper limit to nutrient transport by groundwater both in the control period and the future scenarios. However, for nitrogen, groundwater appeared to be the pathway most sensitive to climate change, with a considerable increase and seasonal redistribution of loadings. For phosphorus, loadings by different pathways were apparently less sensitive to climate change.

Place, publisher, year, edition, pages
Elsevier , 2015. Vol. 518-519, p. 393-406
Keywords [en]
Climate change, Diffuse sources, Nutrient loadings, Substance Flow Analysis, Urban catchments, Catchments, Eutrophication, Groundwater, Lakes, Nitrogen, Nutrients, Phosphorus, River pollution, Runoff, Stream flow, Atmospheric concentration, Climate change scenarios, Future climate scenarios, Generalized watershed loading functions, Nutrient loading, Urban catchment, ground water, rain, catchment, climate effect, lacustrine environment, nutrient enrichment, stormwater, streamflow, urban area, Article, atmospheric deposition, body surface, environmental monitoring, environmental protection, flow measurement, geographic distribution, hydrology, land use, nitrate leaching, priority journal, quantitative analysis, residential area, stream (river), Sweden, watershed, Stockholm [Sweden]
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:ltu:diva-74319DOI: 10.1016/j.scitotenv.2015.02.041ISI: 000353225700041Scopus ID: 2-s2.0-84924571154OAI: oai:DiVA.org:ltu-74319DiVA, id: diva2:1322279
Note

QC 20150602

Available from: 2015-06-02 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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Wu, JiechenMalmström, Maria E.

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