Środowiskowe Seminarium Fizyki Atmosfery

Since 1975, there have been at least eight instruments* made by different researchers aimed at measuring particular aspects of cloud particles. Each effort used holography to take advantage of holography's large localized sample volume for purposes including measuring inter-particle distances (particle clustering), increasing the sample volume rate, and viewing aspects of the internal structure of ice particles. Each study has also recognized the difficulty in processing or analyzing the holograms which is why holography has not been widely used as a measurement tool. However, because holography can measure the local environment around a cloud particle, it has unique advantages in measuring local particle size distributions, small-scale particle clustering, and in a laboratory setting, small-scale particle relative motions. Shown will be some of the presenter's and others' results drawn from holographic measurements. Also presented will be an outline of an experiment being built to simultaneously measure ice crystal fall velocities, mass, and cross-section using holography. * Trolinger 1975, Kozikowska et al. 1984, Brown 1989, Borrmann 1993, Lawson et al. 1995, Fugal et al. 2004, Raupach et al. 2006, Amsler et al. 2009.Bio: Jacob Fugal received his Ph.D. in Physics in 2007 at Michigan Tech with Raymond Shaw as his Ph.D. advisor, building and analyzing data from an airborne holographic instrument to measure cloud particles. Starting in 2008, he worked as a postdoc at NCAR's (National Center for Atmospheric Research) Advanced Study Program in Boulder, Colorado, USA and since 2010 works as a postdoc at the Max Planck Institute for Chemistry in Mainz, Germany further working with holography as a measurement tool for cloud particles in laboratory and in-situ (airborne) settings.