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Identification and characterisation of local aerosol sources using high temporal resolution measurements
- Source :
- Journal of environmental management 12 (2010): 1709–1721. doi:10.1039/c000642d, info:cnr-pdr/source/autori:Contini D.; Donateo A.; Cesari D.; Belosi F.; Francioso S./titolo:Identification and characterisation of local aerosol sources using high temporal resolution measurements/doi:10.1039%2Fc000642d/rivista:Journal of environmental management/anno:2010/pagina_da:1709/pagina_a:1721/intervallo_pagine:1709–1721/volume:12
- Publication Year :
- 2010
- Publisher :
- Academic Press., New York, Regno Unito, 2010.
-
Abstract
- Aerosol and gaseous pollution measurements were carried out at an urban background site in the south of Italy located near an industrial complex. Collection of 24 h samples of PM10 and PM2.5 and successive chemical quantification of metals were performed. Data were compared with measurements taken at a suburban background site, located at 25 km distance. The comparison showed the presence of an industrial contribution with a well defined chemical emission profile, similar, in terms of metals content, to urban emissions. As this made difficult the quantitative characterisation of the contribution of the two sources to atmospheric PM, a statistical method based on the treatment of data arising from high temporal resolution measurements was developed. Data were taken with a micrometeorological station based on an integrating nephelometer (Mie pDR-1200) for optical detection of PM2.5 concentration, with successive evaluation of vertical turbulent fluxes using the eddy-correlation method. Results show that the contribution from the two sources (urban emissions and industrial releases) have a very different behaviour, with the industrial contribution being present at high wind velocity with short concentration peaks (average duration 4 min) associated to strong positive and negative vertical fluxes. The estimated contribution to PM2.5 is 2.3% over long-term averages. The urban emissions are mainly present at low wind velocity, with longer concentration peaks in the morning and late evening hours, generally associated to small positive vertical fluxes. The characterisation of the contribution was performed using deposition velocity V(d) that is on average -3.5 mm s(-1) and has a diurnal pattern, with negligible values during the night and a minimum value of around -9 mm s(-1) late in the afternoon. Results show a correlation between V(d), friction velocity and wind velocity that could be the basis for a parameterisation of V(d) to be used in dispersion codes.
- Subjects :
- Pollution
Meteorology
media_common.quotation_subject
Wind
Management, Monitoring, Policy and Law
Atmospheric sciences
Wind speed
Dispersion (optics)
Shear velocity
Particle Size
media_common
Morning
Aerosols
geography
Air Pollutants
geography.geographical_feature_category
Nephelometer
Atmosphere
Public Health, Environmental and Occupational Health
General Medicine
Aerosol
Environmental science
Particulate Matter
Water well
Environmental Monitoring
Toluene
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Journal of environmental management 12 (2010): 1709–1721. doi:10.1039/c000642d, info:cnr-pdr/source/autori:Contini D.; Donateo A.; Cesari D.; Belosi F.; Francioso S./titolo:Identification and characterisation of local aerosol sources using high temporal resolution measurements/doi:10.1039%2Fc000642d/rivista:Journal of environmental management/anno:2010/pagina_da:1709/pagina_a:1721/intervallo_pagine:1709–1721/volume:12
- Accession number :
- edsair.doi.dedup.....b79dd262c1a41e5e9e92aeeb8cf85f43