Anzahl- und Massenflüsse von Aerosolpartikeln über einer Stadt, erfasst mit hoher Größenauflösung

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The scope of this proposal is to quantify aerosol particle number and mass fluxes over an urban canopy. We plan to address a scientific field that is still widely open. Recent development of instrumental techniques now offers the chance to study these fluxes directly, employing the eddy covariance method. Urbanized areas are both sources and sinks for particles. The source characteristic applies mainly to the particle number, which is a relevant parameter for future toxicological considerations concerning nano-sized aerosol particles. The sink characteristic rather applies to the mass transport, which is important for present studies (and present legislation), for the study of source apportionment of PM2.5 and PM10, and for implementation of particle transport to mesoscale transport models. Presently, there is little knowledge about the exchange processes over the cities and their temporal and spatial characteristics. This study aims to produce a large data basis to produce understanding of these fluxes as function of atmospheric conditions (i.e., stability), land use (emission factors), time of day, week, and year, and, mostly important, of aerosol size. Only through a detailed size segregation of the fluxes we can develop understanding of the aerosol dynamical processes contributing to the fluxes. One of the important issues to be studied is the role of nucleation processes during atmospheric number and mass transport of particles.