Measurement and modeling of cloud condensation nuclei in continental air [Elektronische Ressource] / Diana Rose

Measurement and modelingof cloud condensation nucleiin continental airDissertationzur Erlangung des Grades"Doktor der Naturwissenschaften"am Fachbereich Physikder Johannes–Gutenberg–Universitätin MainzDiana Rosegeboren inMarkranstädtMainz, 20101. Berichterstatter: Prof. Dr. Stephan Borrmann2. Priv.–Doz. Dr. Ulrich PöschlTag der mündlichen Prüfung: 14. September 2010"A little gale will soon disperse that cloudAnd blow it to the source from whence it came.Thy very beams will dry those vapours up,For every cloud engenders not a storm."William Shakespeare, King Henry VI, Part 3, 1591AbstractAtmospheric aerosol particles serving as cloud condensation nuclei (CCN) are key elements of thehydrological cycle and climate. Knowledge of the spatial and temporal distribution of CCN in theatmosphere is essential to understand and describe the effects of aerosols in meteorological models. Inthis study, CCN properties were measured in polluted and pristine air of different continental regions,and the results were parameterized for efficient prediction of CCN concentrations.The continuous-flow CCN counter used for size-resolved measurements of CCN efficiency spec-tra (activation curves) was calibrated with ammonium sulfate and sodium chloride aerosols for a widerange of water vapor supersaturations (S=0.068% to 1.27%).