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Quantifying spatiotemporal variability of fine particles in an urban environment using combined fixed and mobile measurements
Abstract Spatiotemporal variability of fine particle concentrations in Indianapolis, Indiana is quantified using a combination of high temporal resolution measurements at four fixed sites and mobile measurements with instruments attached to bicycles during transects of the city. Average urban PM2.5 concentrations are an average of ∼3.9–5.1 μg m−3 above the regional background. The influence of atmospheric conditions on ambient PM2.5 concentrations is evident with the greatest temporal variability occurring at periods of one day and 5–10 days corresponding to diurnal and synoptic meteorological processes, and lower mean wind speeds are associated with episodes of high PM2.5 concentrations. An anthropogenic signal is also evident. Higher PM2.5 concentrations coincide with morning rush hour, the frequencies of PM2.5 variability co-occur with those for carbon monoxide, and higher extreme concentrations were observed mid-week compared to weekends. On shorter time scales (−3 of the stationary measurements (once the temporal variability is removed). Localized extreme values of PM2.5 concentrations ranged in the spatial dimension from a few hundred meters up to 2 km, and contributed an average of 4.4 μg m−3 to ambient concentrations.
Highlights PM2.5 measured in Indianapolis indicates a strong signature from mobile emissions. Intra-urban PM2.5 variability is the same magnitude as between urban-rural differences. Spatial variability is greater than temporal variability on short time scales. ∼1/3 of hours with high concentrations at one site were not observed at other sites.
Quantifying spatiotemporal variability of fine particles in an urban environment using combined fixed and mobile measurements
Abstract Spatiotemporal variability of fine particle concentrations in Indianapolis, Indiana is quantified using a combination of high temporal resolution measurements at four fixed sites and mobile measurements with instruments attached to bicycles during transects of the city. Average urban PM2.5 concentrations are an average of ∼3.9–5.1 μg m−3 above the regional background. The influence of atmospheric conditions on ambient PM2.5 concentrations is evident with the greatest temporal variability occurring at periods of one day and 5–10 days corresponding to diurnal and synoptic meteorological processes, and lower mean wind speeds are associated with episodes of high PM2.5 concentrations. An anthropogenic signal is also evident. Higher PM2.5 concentrations coincide with morning rush hour, the frequencies of PM2.5 variability co-occur with those for carbon monoxide, and higher extreme concentrations were observed mid-week compared to weekends. On shorter time scales (−3 of the stationary measurements (once the temporal variability is removed). Localized extreme values of PM2.5 concentrations ranged in the spatial dimension from a few hundred meters up to 2 km, and contributed an average of 4.4 μg m−3 to ambient concentrations.
Highlights PM2.5 measured in Indianapolis indicates a strong signature from mobile emissions. Intra-urban PM2.5 variability is the same magnitude as between urban-rural differences. Spatial variability is greater than temporal variability on short time scales. ∼1/3 of hours with high concentrations at one site were not observed at other sites.
Quantifying spatiotemporal variability of fine particles in an urban environment using combined fixed and mobile measurements
Sullivan, R.C. (author) / Pryor, S.C. (author)
Atmospheric Environment ; 89 ; 664-671
2014-03-04
8 pages
Article (Journal)
Electronic Resource
English
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