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Road salt emissions :
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Denby, B. R.Norwegian Meteorological Institute (MET), Norway,The Norwegian Meteorological Institute (MET)
(author)
Road salt emissions : A comparison of measurements and modelling using the NORTRIP road dust emission model
- Article/chapterEnglish2016
Publisher, publication year, extent ...
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Elsevier Ltd,2016
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:ri-61323
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https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-61323URI
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https://doi.org/10.1016/j.atmosenv.2016.07.027DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:vti:diva-10805URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-134233URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Funding details: Nordisk Ministerråd, KOL-1408; Funding text 1: We would like to acknowledge the Nordic Council of Ministers through the project ‘NORTRIP-2’ (Project number KOL-1408) for their financial support of this project. We would also like to acknowledge the following institutes for providing data for this study: The Norwegian Public Roads Administration for traffic and road salting data; the Finnish Meteorological Institute (FMI) for meteorological data and regional background salt concentration data (Utö and Virolahti); Destia Oy and the Centre for Economic Development, Transport and the Environment for road maintenance data at Kehä III; the Finnish Transport Agency for traffic data at Kehä III; the City of Helsinki for traffic and road maintenance data at Hämeentie; the Danish Metrological Institute for providing precipitation data from Copenhagen; Kim N. Sørensen from Copenhagen Municipality for the provision of winter road maintenance data in Copenhagen.
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De-icing of road surfaces is necessary in many countries during winter to improve vehicle traction. Large amounts of salt, most often sodium chloride, are applied every year. Most of this salt is removed through drainage or traffic spray processes but a certain amount may be suspended, after drying of the road surface, into the air and will contribute to the concentration of particulate matter. Though some measurements of salt concentrations are available near roads, the link between road maintenance salting activities and observed concentrations of salt in ambient air is yet to be quantified. In this study the NORTRIP road dust emission model, which estimates the emissions of both dust and salt from the road surface, is applied at five sites in four Nordic countries for ten separate winter periods where daily mean ambient air measurements of salt concentrations are available. The model is capable of reproducing many of the salt emission episodes, both in time and intensity, but also fails on other occasions. The observed mean concentration of salt in PM10, over all ten datasets, is 4.2 μg/m3 and the modelled mean is 2.8 μg/m3, giving a fractional bias of −0.38. The RMSE of the mean concentrations, over all 10 datasets, is 2.9 μg/m3 with an average R2 of 0.28. The mean concentration of salt is similar to the mean exhaust contribution during the winter periods of 2.6 μg/m3. The contribution of salt to the kerbside winter mean PM10 concentration is estimated to increase by 4.1 ± 3.4 μg/m3 for every kg/m2 of salt applied on the road surface during the winter season. Additional sensitivity studies showed that the accurate logging of salt applications is a prerequisite for predicting salt emissions, as well as good quality data on precipitation. It also highlights the need for more simultaneous measurements of salt loading together with ambient air concentrations to help improve model parameterisations of salt and moisture removal processes. © 2016 The Authors
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Ketzel, M.Aarhus University, Denmark
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Ellermann, T.Aarhus University, Denmark
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Stojiljkovic, A.Nordic Envicon Oy, Finland
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Kupiainen, K.Nordic Envicon Oy, Finland
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Niemi, J. V.Helsinki Region Environmental Services Authority (HSY), Finland
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Norman, M.Environment and Health Protection Administration of the City of Stockholm, Sweden
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Johansson, ChristerStockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Environment and Health Protection Administration of the City of Stockholm, Sweden(Swepub:su)chjoh
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Gustafsson, MatsStatens väg- och transportforskningsinstitut,Miljö, MILJÖ,VTI Swedish National Road and Transport Research Institute, Sweden(Swepub:vti)mats.gustafsson@vti.se
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Blomqvist, GöranStatens väg- och transportforskningsinstitut,Miljö, MILJÖ,VTI Swedish National Road and Transport Research Institute, Sweden(Swepub:vti)goran.blomqvist@vti.se
(author)
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Janhäll, Sara,1965-Statens väg- och transportforskningsinstitut,Miljö, MILJÖ,VTI Swedish National Road and Transport Research Institute, Sweden(Swepub:vti)sara.janhall@vti.se
(author)
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Sundvor, I.Norwegian Institute for Air Research (NILU), Norway,The Norwegian Institute for Air Research (NILU)
(author)
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Norwegian Meteorological Institute (MET), NorwayThe Norwegian Meteorological Institute (MET)
(creator_code:org_t)
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In:Atmospheric Environment: Elsevier Ltd141, s. 508-5221352-23101873-2844
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Denby, B. R.
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Ketzel, M.
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Ellermann, T.
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Stojiljkovic, A.
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Kupiainen, K.
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Niemi, J. V.
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Norman, M.
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Johansson, Chris ...
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Gustafsson, Mats
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Sundvor, I.
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VTI - The Swedish National Road and Transport Research Institute
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Stockholm University