HR: 1340h
AN: A43C-0102    [Abstracts]
TI: The Use of Conducting Spheres Electrical Forces in Electroscavenging Simulation
AU: * Plemmons, A
EM: am5212@comcast.net
AF: University of Texas at Dallas, FO22, Box830688, Richardson, TX 75083-0688 United States
AU: Tinsley, B A
EM: Tinsley@UTDallas.edu
AF: University of Texas at Dallas, FO22, Box830688, Richardson, TX 75083-0688 United States
AB: Numerical computations have been carried out to determine the efficiency with which electrically charged cloud droplets, of radii 10 microns, 7 microns, and 5 microns, collide with electrically charged particles of radii ranging from 1 micron up to the droplet radius, at 100 percent relative humidity, temperature of -17C, and pressure of 540mb, under the influence of gravity and inertia. Comparisons are made between the results of a comprehensive version of Davis (1964) conducting spheres method with the less accurate image charge method results of Tinsley et al. (2000, 2001), where differences are most significant. These differences are seen in the region of small droplet to particle size ratios, large charge ratios and small normalized radial distances. Results show that the conducting spheres method in these regions gives a significantly stronger attractive force than the image charge method. For the atmosphere this implies larger electrically-induced scavenging rates for ice forming nuclei and the larger sized CCN, and thus larger contact ice nucleation rates and indirect aerosol effects. References: Davis, M. H., Quart. J. Mech. Appl. Math., 17, 499-511, 1964. Tinsley et al., J. Atmos. Sci., 57, 2118-2134, 2000. Tinsley et al., Atmospheric Research, 59-60, 115-135, 2001.
DE: 0320 Cloud physics and chemistry
DE: 1650 Solar variability (7537)
DE: 2104 Cosmic rays
DE: 3304 Atmospheric electricity
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005