Description: Das Projekt "Field and laboratory studies of the chemical composition and mixing state of black carbon particles and their ability to act as cloud condensation and ice nuclei" wird vom Umweltbundesamt gefördert und von Eidgenössische Technische Hochschule Zürich, Institut für Atmosphäre und Klima durchgeführt. Summary and background: Black carbon (BC) aerosols influence the Earth's radiative budget directly by absorbing incoming solar radiation and indirectly by acting as cloud condensation nuclei (CCN) and ice nuclei (IN), and thereby changing microphysical and radiative properties of the clouds. The influence of BC on warm, mixed-phase and cold cloud indirect effects is highly uncertain due to an insufficient characterization of BC-sources, insufficient information on the physico-chemical properties of ambient BC particles, and an inadequate understanding and hence description of the aerosol-cloud interactions and microphysical processes applied in climate models. We propose to perform field and laboratory studies of the chemical composition and mixing state of BC particles and their ability to act as cloud condensation and ice nuclei. The results will help to understand the dependence of water and ice nucleating behavior of BC particles on their chemical composition and mixing state, and to identify distinct BC sources. Aims and relevance: The understanding and investigation of climate change and related atmospheric processes is a highly topical research field and subject of academic and public interest. The recent 2007 report of the IPCC (Intergovernmental Panel of Climate Change) stressed the need to improve our understanding of the aerosol radiative forcing component for constraining it's climate impact more accurately. The lack of understanding of the aerosol effects on climate is mainly due to the lack of knowledge of aerosol-cloud interactions. Herein, the proposed laboratory and field experiments will provide new data to improve aerosol-cloud interactions in climate and process-related models and to reduce the uncertainties of the anthropogenic influence on climate via the direct and indirect effect aerosol effects. Moreover, the new measurement approach we propose herein for source apportionment of BC particles, i.e. identify and quantify distinct BC sources, is of interest for local climate change estimates and questions related to air pollution and public health. This is due to the fact that our field measurements focus on particles emitted locally (in Switzerland) and transported on a regional scale. However, the role of BC emissions from residential heating is far more important in other region of the world.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Wolkenbildung ? Wolke ? Bewölkung ? Lack ? Zürich ? Black Carbon ? Atmosphärisches Aerosol ? Rohwasser ? Solarstrahlung ? Zellkern ? Schweiz ? Aerosol ? Chemische Zusammensetzung ? Eis ? Massenspektrometrie ? Partikelemission ? Luftverschmutzung ? Daten ? Feldstudie ? Gewässerzustand ? Klimamodell ? Kondensation ? Marktforschung ? Mesoklima ? Quantitative Analyse ? Schadstoffausbreitung ? Studie ? Allgemeine Gesundheit ? Wirkungsanalyse ? Messung ? Klimabericht ? Kondensationskern ? Heizung ? Klimawandel ? Klimabeeinflussung ? Ausbreitungsvorgang ? Klimawirkung ? Laboruntersuchung ? Atmosphärischer Prozess ? Öffentliches Interesse ? Partikel ? Anthropogener Einfluss ? Freilandversuch ? Strahlungsantrieb ? Atmosphäre ? Eisnukleation ? cloud condensation ? Bestimmung der Schadstoffquelle ? ice nuclei ? Wechselwirkung ? Wolkenkondensationskeim ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2010-11-01 - 2013-10-31
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