Die u:cris Detailansicht:
Long-term quantitative field study of New Particle Formation (NPF) events as a source of Cloud Condensation Nuclei (CCN) in the urban background of Vienna
- Autor(en)
- Carmen Dameto de España, A. Wonaschuetz, G. Steiner, B. Rosati, A. Demattio, H. Schuh, R. Hitzenberger
- Abstrakt
Many studies have indicated New Particle Formation (NPF) events as an
important source of CCN in the atmosphere. However, most of these
studies are based on indirect determination of CCN concentrations or
were of rather short duration. In this study, we present long-term
measurements of CCN concentrations and particle number size
distributions performed in the urban background of Vienna, Austria,
spanning a period of two years. NPF events occurred on 70 of the 539
measurement days. For 38 of these events, concurrent CCN concentrations
(measured at 0.5% supersaturation) are available. Direct comparisons of
absolute CCN concentrations before and after an event, however, are
inconclusive as other influences can lead to changes in CCN
concentrations. In this study, we developed criteria to take local
emissions of ultrafine particles, atmospheric mixing conditions and
changes in air mass into account. A new normalization procedure
(CCN/PM2.5) is introduced to account for dilution and concentration
effects due to changes in boundary layer height. Other possible
influences, such as weather conditions and traffic emissions were
accounted for by tracking wind direction and velocity, as well as black
carbon (BC) mass concentrations. On 15 event days, all criteria to
exclude other influences were met. On 14 days, NPF was found to be a
source of CCN (at 0.5% supersaturation), with concentration increases by
up to 143%.
- Organisation(en)
- Aerosolphysik und Umweltphysik
- Externe Organisation(en)
- Leopold-Franzens-Universität Innsbruck, Universität Wien
- Journal
- Atmospheric Environment
- Band
- 164
- Seiten
- 289-298
- Anzahl der Seiten
- 10
- ISSN
- 1352-2310
- DOI
- https://doi.org/10.1016/j.atmosenv.2017.06.001
- Publikationsdatum
- 09-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103037 Umweltphysik, 103039 Aerosolphysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Allgemeine Umweltwissenschaft, Atmospheric Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/e29293c9-2909-4d2d-83ac-555654f62c31