92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Tuesday, 24 January 2012: 5:00 PM
An Intercomparison of Model Simulations and VPR Estimates of the Vertical Structure of a Mesoscale Convective System During MC3E
Room 256 (New Orleans Convention Center )
Anna M. Wilson, Duke Univ., Durham, NC; and A. P. Barros and C. R. Williams

Dynamic drop size distribution (DSD) simulations were conducted on a mesoscale convective system (MCS) that occurred during the Midlatitude Continental Convective Cloud Experiment (MC3E) 2011 ground validation campaign. Simulations were run using a 3D microphysical model that solves the stochastic advection-coalescence-breakup equation in an atmospheric column. Data were retrieved from disdrometers and profilers at the Central Facility in Oklahoma. The profilers were used to obtain DSD boundary conditions at the top of the rainshaft. The model was used to characterize the 3D structure and evolution of the DSD in the rainshaft. Rain rates, reflectivities, and liquid water content were derived with the model at each height level, with a vertical spatial resolution of 10 meters and a temporal resolution of 1 second. Results will be presented comparing the model results with those from vertically pointing radars (VPR) and ground based observations (2D video disdrometers and Parsivel disdrometers). The model's success in simulating the MC3E convective case will be compared with that from a previous study for a stratiform rainfall event during TWP-ICE (Prat et al. 2008), so that its performance in different precipitation regimes can be assessed. Ongoing work in expanding the model's ability to represent all relevant physical processes will also be discussed (i.e. ice and aerosols).

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