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- W2099956768 abstract "The vertical variation of particle number distributions (PNDs) and concentrations in a street canyon is the result of the competing influences of meteorology, traffic and transformation processes overall and for various particle size ranges. A recently developed instrument, the ‘fast-response differential mobility spectrometer DMS500’, measured PNDs in the 5–2738 nm range, pseudo-simultaneously, at four different heights (z/H=0.09, 0.19, 0.40 and 0.64) on the leeward side of an 11.6-m-deep street canyon which had a height-to-width ratio of near unity. Measurements were made in Cambridge, UK, between 20 and 21 March 2007. The PNDs were bimodal with the same shape at each height, and with similar values of both the peak and geometric mean particle diameters in each mode. This suggested that transformation processes were not important. Coagulation and condensation time scales were comparable and large, and these processes should have had a negligible effect on the PNDs. The particle number concentrations (PNCs) changed significantly with height from a maximum at z/H=0.19 and decreasing towards both the lowest (z/H=0.09) and highest (z/H=0.64) sampling points. The decrease in PNCs with height in the upper part of the canyon was attributed to the removal of particles as a result of mass exchange between street canyon and the wind above while the reduction in the PNC towards street level was thought to be due to dilution and dry deposition. Over 99% of the PNCs were found in 10–300 nm range whereas the particle mass concentrations were almost equally distributed between the 10–1000 nm and 1000–2738 nm size range at each height. The PNCs in the 10–30 nm and the 30–300 nm size range were linearly correlated with the traffic volume but poorly correlated with the rooftop wind speed." @default.
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- W2099956768 date "2008-06-01" @default.
- W2099956768 modified "2023-10-03" @default.
- W2099956768 title "Pseudo-simultaneous measurements for the vertical variation of coarse, fine and ultrafine particles in an urban street canyon" @default.
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- W2099956768 doi "https://doi.org/10.1016/j.atmosenv.2008.01.010" @default.
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