HR: 1330h
AN: A13A-15    [Abstracts]
TI: Impacts from Aerosol and Ice Particle Multiplication on Deep Convection Simulated by a Cloud-Resolving Model with a Double-Moment Bulk Microphysics Scheme and Fully Interactive Radiation
AU: * Phillips, V T
EM: vaughan.phillips@noaa.gov
AF: Atmospheric and Oceanic Sciences (AOS) program, Princeton University, Geophysical Fluid Dynamics Laboratory (GFDL),, Princeton, NJ 08540 United States
AU: Donner, L J
EM: Leo.j.Donner@noaa.gov
AF: Geophysical Fluid Dynamics Laboratory (GFDL), NOAA/OAR, Princeton Forrestal Campus Rte 1, Princeton, NJ 08540 United States
AB: The size of cloud particles, in both the liquid and ice phases, determines the effect of clouds on the radiation budget of the atmosphere. A novel approach is presented for predicting the number of particles, as well as their mass, for cloud-ice and cloud-liquid. This allows the average particle size to be predicted. There is an interactive aerosol component for ice nuclei and cloud condensation nuclei in the model. For cloud-ice, primary ice nucleation, Hallett-Mossop (H-M) ice particle multiplication and homogeneous freezing of aerosols and droplets provide the source of ice-number in this 'double-moment' bulk microphysics scheme. For cloud-liquid, primary and secondary droplet nucleation is represented, by predicting the supersaturation. A power-law activity spectrum for the aerosol is assumed. Sensitivity tests with respect to the environmental concentration of ice nuclei and cloud condensation nuclei, and to the inclusion of ice particle multiplication, are performed. The corresponding impacts on radiative, dynamical and microphysical cloud statistics are described.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly