Evaluation and modelling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part I: Modelling results within the LIPIKA project

Pohjola, Mia; Pirjola, Liisa; Karppinen, Ari; Härkönen, Jari; Korhonen, Hannele; Hussein, Tareq; Ketzel, Matthias; Kukkonen, Jaakko

doi:10.5194/acp-7-4065-2007

Cited by 57 publications

(42 citation statements)

References 42 publications

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“…Limited primarily by instrument response time, many mobile monitoring campaigns to assess near-road spatial concentration gradients have been restricted to repeatedly stopping at preselected locations and collecting data for a short period of time. 2,4,[11][12][13] These studies have provided substantial information on near-road concentration gradients and demonstrated the capability of mobile monitoring to augment conventional stationary monitoring sites. However, all are limited to monitoring at only a few locations near the roadway of interest.…”

Section: Discussionmentioning

confidence: 99%

High-Resolution Mobile Monitoring of Carbon Monoxide and Ultrafine Particle Concentrations in a Near-Road Environment

Hagler

Thoma

Baldauf

2010

Journal of the Air & Waste Management Association

114

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Assessment of near-road air quality is challenging in urban environments that have roadside structures, elevated road sections, or depressed roads that may impact the dispersion of traffic emissions. Vehicles traveling on arterial roadways may also contribute to air pollution spatial variability in urban areas. To characterize the nature of near-road air quality in a complex urban environment, an instrumented all-electric vehicle was deployed to perform high spatial-and temporal-resolution mapping of ultrafine particles (UFPs, particle diameter Ͻ100 nm) and carbon monoxide (CO). Sampling was conducted in areas surrounding a highway in Durham, NC, with multiple repeats of the driving route accomplished within a morning or evening commute time frame. Six different nearroad transects were driven, which included features such as noise barriers, vegetation, frontage roads, and densely built houses. Under downwind conditions, median UFP and CO levels in near-road areas located 20 -150 m from the highway were a factor of 1.8 and 1.2 higher, respectively, than in areas characterized as urban background. Sampling in multiple near-road neighborhoods during downwind conditions revealed significant variability in absolute UFP and CO concentrations as well as in the rate of concentration attenuation with increasing distance from the highway. During low-speed meandering winds, regional UFP and CO concentrations nearly doubled relative to crosswind conditions; however, near-road UFP levels were still higher than urban background levels by a factor of 1.2, whereas near-road CO concentrations were not significantly different than the urban background.

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Section: Discussionmentioning

confidence: 99%

High-Resolution Mobile Monitoring of Carbon Monoxide and Ultrafine Particle Concentrations in a Near-Road Environment

Hagler

Thoma

Baldauf

2010

Journal of the Air & Waste Management Association

114

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“…They categorized the aerosol to several types: central European aerosol, Nordic aerosol, mountain sites, and southern and western European regions, and analysed the seasonal characteristics and patterns of the various size modes. Hussein et al (2007) and Pohjola et al (2007) conducted a field measurement campaign near a major road in an urban area in Helsinki in February 2003. Measured PNC data at various distances from the road was compared with dispersion and aerosol process model predictions.…”

Section: J Kukkonen Et Al: Modelling the Dispersion Of Particle Nummentioning

confidence: 99%

Modelling the dispersion of particle numbers in five European cities

et al. 2016

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Abstract. We present an overview of the modelling of particle number concentrations (PNCs) in five major European cities, namely Helsinki, Oslo, London, Rotterdam, and Athens, in 2008. Novel emission inventories of particle numbers have been compiled both on urban and European scales. We used atmospheric dispersion modelling for PNCs in the five target cities and on a European scale, and evaluated the predicted results against available measured concentrations. In all the target cities, the concentrations of particle numbers (PNs) were mostly influenced by the emissions originating from local vehicular traffic. The influence of shipping and harbours was also significant for Helsinki, Oslo, Rotterdam, and Athens, but not for London. The influence of the aviation emissions in Athens was also notable. The regional background concentrations were clearly lower than the contributions originating from urban sources in Helsinki, Oslo, and Athens. The regional background was also lower than urban contributions in traffic environments in London, but higher or approximately equal to urban contributions in Rotterdam. It was numerically evaluated that the influence of coagulation and dry deposition on the predicted PNCs was substantial for the urban background in Oslo. The predicted and measured annual average PNCs in four cities agreed within approximately ≤ 26 % (measured as fractional biases), except for one traffic station in London. This study indicates that it is feasible to model PNCs in major cities within a reasonable accuracy, although major challenges remain in the evaluation of both the emissions and atmospheric transformation of PNCs.

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“…Gross and Baklanov, 2004;Dusek et al, 2006;Pohjola et al, 2007;Hussein et al, 2007;Medina et al, 2007;Langmann et al, 2008). The aerosol processes include the growth and nucleation processes, and the transport and deposition pathways of the aerosols.…”

Section: Improved Understanding and Parameterization Of Physical Procmentioning

confidence: 99%

A review of operational, regional-scale, chemical weather forecasting models in Europe

et al. 2012

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Abstract. Numerical models that combine weather forecasting and atmospheric chemistry are here referred to as chemical weather forecasting models. Eighteen operational chemical weather forecasting models on regional and continental scales in Europe are described and compared in this article. Topics discussed in this article include how weather forecasting and atmospheric chemistry models are integrated into chemical weather forecasting systems, how physical processes are incorporated into the models through parameterization schemes, how the model architecture affects the predicted variables, and how air chemistry and aerosol processes are formulated. In addition, we discuss sensitivity analysis and evaluation of the models, user operational requirements, such as model availability and documentation, and output availability and dissemination. In this manner, this article allows for the evaluation of the relative strengths and weaknesses of the various modelling systems and modelling approaches. Finally, this article highlights the most prominent gaps of knowledge for chemical weather forecasting models and suggests potential priorities for future research Published by Copernicus Publications on behalf of the European Geosciences Union. J. Kukkonen et al.: A review of operational, regional-scale, chemical weather forecasting models in Europedirections, for the following selected focus areas: emission inventories, the integration of numerical weather prediction and atmospheric chemical transport models, boundary conditions and nesting of models, data assimilation of the various chemical species, improved understanding and parameterization of physical processes, better evaluation of models against data and the construction of model ensembles.

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Evaluation and modelling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part I: Modelling results within the LIPIKA project

Cited by 57 publications

References 42 publications

High-Resolution Mobile Monitoring of Carbon Monoxide and Ultrafine Particle Concentrations in a Near-Road Environment

High-Resolution Mobile Monitoring of Carbon Monoxide and Ultrafine Particle Concentrations in a Near-Road Environment

Modelling the dispersion of particle numbers in five European cities

A review of operational, regional-scale, chemical weather forecasting models in Europe

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