Description: Das Projekt "Investigation of Secondary Organic Aerosol Formation in the PSI Smog Chamber" wird vom Umweltbundesamt gefördert und von Paul Scherrer Institut, Labor für Atmosphärenchemie durchgeführt. Ambient aerosol particles have a variety of important impacts, including adverse health effects, visibility reduction and their influence on climate. Carbonaceous particles comprise a large fraction of the atmospheric aerosol, however, their concentrations as well as formation and transformation mechanisms are still very little understood. A major question relates to their primary versus secondary sources, i.e. which fraction is emitted directly in particulate form into the atmosphere, and which fraction is formed in the atmosphere by oxidation reactions. Another important question concerns their biogenic versus anthropogenic origin, especially for the secondary organic aerosol (SOA). In order to address these questions, the formation and transformation mechanisms of SOA, both from anthropogenic and biogenic sources, will be investigated in the PSI smog chamber. The chamber is equipped with a variety of state of the art gas and aerosol instrumentation, allowing for experiments in unprecedented completeness. This project is part of a large ongoing collaborative effort, which has the following objectives: To better understand the mechanisms of gas phase degradation, especially for non-traditional SOA precursors (sesquiterpenes, semivolatile organics from diesel and wood combustion) and for non-traditional reactants (NO3 etc.). To quantify aerosol yields from these non-traditional SOA precursors and their contribution to the overall SOA concentration. To discriminate SOA into its anthropogenic and biogenic contributions, including the elucidation of a potential anthropogenic impact on biogenic SOA. To assess the importance of the various oligomer formation mechanisms. To assess the fate of SOA through further aging processes. To explore ways to assess the health effects of secondary organic aerosol Within the core project, the topics to be investigated include gas phase degradation and SOA formation from non-traditional SOA precursors, aging of aerosol with potential volatilization of SOA, and discrimination of anthropogenic and biogenic SOA. The project is embedded in a number of national and international networks and activities, showing that the PSI smog chamber has been established as a well perceived user facility. This will result in a significant enhancement of its own research potential. A better understanding of SOA formation and transformation processes will have a substantial impact towards a better understanding both in air quality and climate. Concerning air quality, this will help in designing optimal mitigation strategies. Especially the question of anthropogenic versus biogenic SOA is of prime importance here. Concerning climate, this will help in reducing the uncertainties associated with aerosol processes, which has been identified by the Intergovernmental Panel on Climate Change (IPCC) as a key element in improving climate change assessment.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Dieselkraftstoff ? Gesundheitsgefährdung ? Nitrat ? Gesundheitliche Auswirkungen ? Atmosphärisches Aerosol ? Brunnen ? Chemische Analyse ? Aerosol ? Verdunstung ? Wirkung ? Gasförmiger Stoff ? Vorläufersubstanz ? Bildung ? Bewertung ? Bohrkern ? Holzfeuerung ? Luftqualität ? Oxidation ? Stand der Technik ? Substratabbau ? Wirkung ? Abbau ? Anthropogener Einfluss ? Arbeit ? Atmosphäre ? Atmosphärenchemie ? Forschung ? Gesundheit ? Klima ? Klimawandel ? Klimabeeinflussung ? Partikel ? Planung ? Anlage ? Staat ? Strategische Aspekte ? ERGEBNIS ? FORMBLAETTER ? LAENDER ? ANWENDER ? BEITRAG ? MECHANISMEN ? NATIONAL ? BEWERTEN ? POTENZIAL ? PROJEKT ? TEIL ? VERARBEITEN ? VERBLEIB ? VERRINGERUNG ? VERWANDT ? Verflüchtigung ? WAND ? WICHTIG ? ZWISCHENSTAATLICH ? FRAGE ? Aerosolentstehung ? EXPERIMENT ? FRAKTION ? Alterung ? Geisteswissenschaften ? HILF ? INITIATIVE ? Isolierung ? Erlass [Recht] ? Konzentrat ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2008-04-01 - 2011-03-31
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