Urban tracer dispersion experiments during the second DAPPLE field campaign in London 2004

Martin, Damien; Price, C. S.; White, Iain R.; Nickless, G.; Petersson, K. F.; Britter, Rex; Robins, Alan; Belcher, Stephen E.; Barlow, Janet F.; Neophytou, Marina; Arnold, S. J.; Tomlin, Alison S.; Smalley, Robert; Shallcross, Dudley E.

doi:10.1016/j.atmosenv.2010.05.007

Cited by 21 publications

(28 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental data were then pooled with experimental data obtained as part of the DAPPLE campaign (Martin et al, 2010b, Wood et al, 2009.…”

Section: Discussionmentioning

confidence: 99%

“…The model is based on a street network concept, using street segments and intersections to represent the geometry, with tracer exchanges between streets taking place at the intersections. Performance was generally best for wind directions approximately diagonal to the street axes (∼45 o ), while cases with wind directions almost parallel to the street axis gave results with larger uncertainties (Martin et al, 2010b).…”

Section: Model Evaluationmentioning

confidence: 99%

“…Data from the DAPPLE site was studied using a number of screening models including the simple empirical correlation outlined here (Martin et al, 2010b). The other two models used knowledge of the wind profile, friction velocity, turbulence standard deviations and integral time scales in order to describe dispersion.…”

Section: Model Evaluationmentioning

confidence: 99%

See 2 more Smart Citations

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

et al. 2011

Self Cite

View full text Add to dashboard Cite

Abstract. There have been relatively few tracer experiments carried out that have looked at vertical plume spread in urban areas. In this paper we present results from two tracer (cyclic perfluorocarbon) experiments carried out in 2006 and 2007 in central London centred on the BT Tower as part of the REPARTEE (Regent's Park and Tower Environmental Experiment) campaign. The height of the tower gives a unique opportunity to study vertical dispersion profiles and transport times in central London. Vertical gradients are contrasted with the relevant Pasquill stability classes. Estimation of lateral advection and vertical mixing times are made and compared with previous measurements. Data are then compared with a simple operational dispersion model and contrasted with data taken in central London as part of the DAPPLE campaign. This correlates dosage with non-dimensionalised distance from source. Such analyses illustrate the feasibility of the use of these empirical correlations over these prescribed distances in central London.

show abstract

“…Experimental data were then pooled with experimental data obtained as part of the DAPPLE campaign (Martin et al, 2010b, Wood et al, 2009.…”

Section: Discussionmentioning

confidence: 99%

Section: Model Evaluationmentioning

confidence: 99%

See 1 more Smart Citation

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…For this reason the street-canyon model OSPM, validated on the basis of these in situ experiments in regular street canyons (aspect ratio $ unity), predicts maximum concentration levels when the wind is parallel to the street (Berkowicz et al, 1997). More recently, more extensive in situ experimental campaigns were performed providing additional information on the dependence of ground level on wind speed and directions (Berkowicz et al, 2002;Kumar et al, 2008;Tomlin et al, 2009;Martin et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Dispersion in a street canyon for a wind direction parallel to the street axis

Soulhac

Salizzoni

2010

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

“…This is especially true in urban air pollution problems, where pollutant sources are spatially distributed and highly variable in time and space. One empirical approach used to address this problem is to perform dispersion experiments, in which the emission rate of a certain tracer is highly controlled while its concentrations are measured in the surroundings (Martin et al, 2010;White et al, 1999). Complete a priori knowledge on the emissions allows in this case enhanced knowledge on the meteorological factors of the air pollution problem under consideration.…”

Section: Introductionmentioning

confidence: 99%

Relative roles of emissions and meteorology in the diurnal pattern of urban PM₁₀: Analysis of the daylight saving time effect

Muñoz

2012

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Daylight saving time (DST) is a common practice in many countries, in which Official Time (OT) is abruptly shifted 1 hour with respect to solar time on two occasions every year (in fall and spring). All anthropogenic emitting processes tied to OT, like job and school commuting traffic, abruptly change in this moment their timing with respect to solar time, inducing a sudden shift between emissions and the meteorological factors that control the dispersion and transport of air pollutants. Analyzing 13 years of hourly particulate matter (PM10) concentrations measured in Santiago, Chile, we demonstrate that the DST practice has observable nontrivial effects in the PM10 diurnal cycle. The clearest impact is in the morning peak of PM10 during the fall DST change, which occurs later and has on average a significant smaller magnitude in the days after the DST change as compared to the days before it. This decrease in magnitude is most remarkable because it occurs in a period of the year when overall PM10 concentrations increase due to generally worsening of the dispersion conditions. Results are shown for seven monitoring stations around the city, and for the fall and spring DST changes. They show clearly the interplay of emissions and meteorology in conditioning urban air pollution problems, highlighting the role of the morning and evening transitions of the atmospheric boundary layer in shaping the diurnal pattern of urban air pollutant concentrations.Implications: The effects of daylight saving time adjustments on the diurnal cycle of PM 10 measured in Santiago, Chile, have been shown through the analysis of 13 years of hourly concentration data for seven air quality monitoring stations distributed over the city. They constitute an empirical demonstration of the sensitivity of PM 10 levels to modifications in the emission patterns and, as such, help in evaluating emission control measures taken during pollution episodes, as well as in constraining the magnitude and time phases of emission estimates used in numerical dispersion models.

show abstract

Urban tracer dispersion experiments during the second DAPPLE field campaign in London 2004

Cited by 21 publications

References 22 publications

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

Dispersion in a street canyon for a wind direction parallel to the street axis

Relative roles of emissions and meteorology in the diurnal pattern of urban PM₁₀: Analysis of the daylight saving time effect

Contact Info

Product

Resources

About

Urban tracer dispersion experiments during the second DAPPLE field campaign in London 2004

Cited by 21 publications

References 22 publications

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

Tracer concentration profiles measured in central London as part of the REPARTEE campaign

Dispersion in a street canyon for a wind direction parallel to the street axis

Relative roles of emissions and meteorology in the diurnal pattern of urban PM10: Analysis of the daylight saving time effect

Contact Info

Product

Resources

About

Relative roles of emissions and meteorology in the diurnal pattern of urban PM₁₀: Analysis of the daylight saving time effect