HR: 17:50h
AN: A14B-08    [Abstracts]
TI: On the dependence of cloud droplet spectral dispersion on aerosol populations in shallow marine convection
AU: * Ackerman, A S
EM: andrew.ackerman@nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, United States
AB: The so-called Twomey effect is amplified or diminished when increasing droplet concentrations increase or decrease the relative dispersion of cloud droplet size distributions. Results from a number of observational and theoretical studies conflict on whether relative dispersion increases or decreases as droplet concentrations increase. We present results from large-eddy simulations with bin microphysics that target this issue. The simulations are based on case studies of marine stratocumulus and trade cumulus idealized from field projects. Beyond our consideration of environmental factors, we also assess the impact of ignoring the droplet curvature and solute effects on droplet condensational growth, as commonly done in previous studies.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting