Description: Das Projekt "EUROTRAC II: Der Lebenszyklus troposphaerischer Aerosole" wird vom Umweltbundesamt gefördert und von Paul Scherrer Institut durchgeführt. Short description: The life cycle of the tropospheric aerosol is investigated by addressing three different topics: the chemical mass balance of the tropospheric aerosol needed to perform a source apportionment; - the impact of heterogeneous processes on the surface chemistry of the aerosol and the gas phase chemistry of the troposphere; - and the major removal processes of aerosol particles from the atmosphere. The project will help in improving the quantitative understanding of these processes and thus assist in alleviating the environmental problems related to aerosols. Project aims: By changing the surface properties of the aerosol particles, heterogeneous processes are assumed to increase the capabilities of these particles of act as cloud condensation nuclei (CCN) and ice forming nuclei (IN) during cloud formation. However, a great uncertainty still exists which aerosol particles actually serve as CCN and IN and, on the other hand, to which extent cloud processing further alters the chemical properties of the involved particles. Since clouds are important for the transport, transformation and deposition of acidifying species and have also been shown to affect the regional budget of photo-oxidants in the atmosphere, we therefore propose to investigate the chemical properties of CCN and IN in cold clouds during field experiments which will be conducted at the high-alpine research station Jungfraujoch (3450 m asl). Techniques will be improved to collect individual ice crystals and cloud droplets and to chemically analyze the scavenged trace species in both.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Wolkenbildung ? Bewölkung ? Photooxidantien ? Zellkern ? Aerosol ? Eis ? Luftverschmutzung ? Gasförmiger Stoff ? Chemikalien ? Kondensation ? Stoffbilanz ? Troposphäre ? Deposition ? Chemische Stoffeigenschaft ? Atmosphäre ? Atmosphärenchemie ? Freilandversuch ? Kondensationskern ? Lebenszyklus ? Stofftransport ? chemical mass balance ? impact of heterogeneous processes ? removal processes of aerosol particles f ? tropospheric aerosol ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1997-07-01 - 2000-09-30
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