11. Use of reactive tracers to determine ambient OH radical concentrations: Application within the indoor environmentDudley E. Shallcross, Keven C Clemitshaw, Guy C Lloyd-Jones, Graham Nickless, Stephen J Henshaw, Fredrik K Petersson, Maria Paz Muñoz, Damien Martin, Iain R White, 2010, original scientific article Abstract: The hydroxyl radical (OH) plays a key role in determining indoor air quality. However, its highly reactive nature and low concentration indoors impede direct analysis. This paper describes the techniques used to indirectly quantify indoor OH, including the development of a new method based on the instantaneous release of chemical tracers into the air. This method was used to detect ambient OH in two indoor seminar rooms following tracer detection by gas chromatography- mass spectrometry (GCMS). The results from these tests add to the small number of experiments that have measured indoor OH which are discussed with regard to future directions within air quality research.
Found in: osebi
Keywords: Ozone, Indoor air pollution, Indoor ozone, chemical tracers
Published: 18.07.2019; Views: 2201; Downloads: 0
 Fulltext (153,74 KB) |
12. Tracer concentration profiles measured in central London as part of the REPARTEE campaignDamien Martin, K Fredrik Petersson, Iain R White, Stephen H Henshaw, Graham Nickless, Amy Lovelock, Janet F Barlow, Tyrone Dunbar, Curtis R Wood, Dudley E. Shallcross, 2011, original scientific article 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.
Found in: osebi
Keywords: advection, concentration (composition), dispersion, tracer, urban atmosphere, vertical mixing, vertical profile
Published: 18.07.2019; Views: 2325; Downloads: 0
Fulltext (1,49 MB) |
