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Titolo/Abstract/Parole chiave

Study of aerosol scavenging processes in atmosphere

Di Matteo, Lorenza (2011) Study of aerosol scavenging processes in atmosphere. Tesi di Dottorato , Università degli Studi di Ferrara.

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    Abstract

    The aerosol removal has a fundamental role because aerosol has impact on human health, on visibility and act as a condensation center for cloud droplets and ice crystals, changing cloud properties (indirect e�ects on cli- mate). In this work, di�erent removal processes of aerosol have been studies experimentally (thermophoresis, ice nuclei, cloud condensation nuclei and below-cloud scavenging), with the aim to obtain a global study of these processes. Concerning the study of thermophoresis, experiments were per- formed in microgravity conditions, in order to minimize the impact of grav- ity. Particle trajectories and consequently particle velocities were recon- structed by analyzing the sequence of particle positions. Studies on forma- tion of IN and CCN, realized through two experimental campaigns, permit- ted to improve knowledge about these phenomena. Measurements related to CCN reveal diurnal trend with lower values at about midday and higher ones during the night. Measurements of IN reveal a positive correlation between higher supersaturation with respect to ice and water values and ice nuclei number concentration. Finally, indoor and outdoor measurements of aerosol concentrations were carried out; it was found that the aerosol removal is in uenced by rainfall duration.

    Tipologia del documento:Tesi di Dottorato (Tesi di Dottorato)
    Data:16 Marzo 2011
    Relatore:Porcù, Federico - Piano, Angelo
    Coordinatore ciclo:Frontera, Filippo
    Istituzione:Università degli Studi di Ferrara
    Dottorato:XXIII Anno 2008 > FISICA
    Struttura:Dipartimento > Fisica
    Soggetti:Area 02 - Scienze fisiche > FIS/06 Fisica per il sistema terra e il mezzo circumterrestre
    Parole chiave:aerosol, scavenging
    Depositato il:13 Apr 2012 14:55

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