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| Titel |
Ultrafine particle formation in the inland sea breeze airflow in Southwest Europe |
| VerfasserIn |
R. Fernández-Camacho, S. Rodríguez, J. Rosa, A. M. Sánchez de la Campa, M. Viana, A. Alastuey, X. Querol |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 19 ; Nr. 10, no. 19 (2010-10-11), S.9615-9630 |
| Datensatznummer |
250008822
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| Publikation (Nr.) |
 copernicus.org/acp-10-9615-2010.pdf |
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| Zusammenfassung |
| Studies on ultrafine particles (diameter < 100nm) and air quality have
mostly focused on vehicle exhaust emissions and on new particle formation in
"clean" ambient air. Here we present a study focused on the processes
contributing to ultrafine particle concentrations in a city (Huelva, SW
Spain) placed close to a coastal area where significant anthropogenic
emissions of aerosol precursors occur. The overall data analysis shows that
two processes predominantly contribute to the number of particles coarser
than 2.5 nm: vehicle exhaust emissions and new particle formation due to
photo-chemical activity. As typically occurs in urban areas, vehicle exhaust
emissions result in high concentrations of black carbon (BC) and particles
coarser than 2.5 nm (N) during the morning rush hours. The highest N
concentrations were recorded during the 11:00–17:00 h period, under the sea
breeze regime, when low BC concentrations were registered and photochemical
activity resulted in high O3 levels and in new particle formation in the
aerosol precursors' rich inland airflow. In this period, it is estimated that
about 80% of the number of particles are linked to sulfur dioxide
emissions. The contributions to N of "carbonaceous material and those
compounds nucleating/condensing immediately after emission" and of the
"new particle formation processes in air masses rich gaseous precursors
(e.g. SO2)" were estimated by means of a relatively novel method based
on simultaneous measurements of BC and N. A comparison with two recent
studies suggests that the daily cycles of "new particle formation" during
the inland sea breeze is blowing period seem to be a feature of ultrafine
particles in coastal areas of South-west Europe. |
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