HR: 11:00h
AN: A42A-03    [Abstracts]
TI: Sensitivity Of Cloud Microphysical Processes On Hurricane Intensity
AU: * pattnaik, s
EM: spt@met.fsu.edu
AF: Department Of Meteorology Florida State University, Love Building, Tallahassee, FL 32306 United States
AU: Krishnamurti, T N
EM: tnk@io.met.fsu.edu
AF: Department Of Meteorology Florida State University, Love Building, Tallahassee, FL 32306 United States
AB: We have been carrying out sensitivity studies on hurricane intensity to cloud microphysical parameters. These are model studies that make use of the fifth generation non-hydrostatic Pennsylvania-National Center Atmospheric Research (PSU-NCAR) high-resolution cloud resolving mesoscale model (MM5) in a multiple nested manner, having the inner most domain with 3km horizontal resolution and with fully explicit representation of moist process. This study elucidates the role of various production and conversion terms (viz. melting, evaporation, condensation, accretion) of hydrometeors (i.e. graupel, snow and ice) in the microphysical parameterization scheme in determining the intensity changes of the hurricane. We examine the impact of over production of these frozen hydrometeors, which lead to water loading problem and also explore sensitivity of other source of uncertainties (e.g. intercept parameter, slope parameter, fall speed) of hydrometeors, which are ultimately influencing (directly or indirectly) on the precipitation and intensification forecast of Hurricanes. The high resolution global model data sets are being used for the creation of initial and boundary conditions for the model's coarsest domain, subsequently finer inner domains are constructed using the initial and boundary conditions from their respective domains. The findings of this study provide us useful information on the deficiencies of the empirical formulations of microphysical parameterization schemes for hurricane simulations.
DE: 3329 Mesoscale meteorology
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly