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Communication incl. Poster: BibTeX citation key:  Penide
Penide, G., Giraud, V., Bouniol, D., Dubuisson, P., Duroure, C. & Protat, A. 2009. The 7 to 9 September 2006 AMMA anvil-cirrus cloud case study: Numerical Simulation of the Dynamics, Cloud Microphysics, and Synthetic observations. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-04 19:16:56
Categories: Atmospheric processes, Water cycle
Keywords: Atmospheric Boundary Layer, Clouds - Convection, Modelling
Creators: Bouniol, Dubuisson, Duroure, Giraud, Penide, Protat
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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We present a numerical simulation of a Mesoscale Convective System (MCS) observed during the AMMA (African Monsoon Multidisciplinary Analyses) experiment with the BRAMS model (Brazilian Regional Atmospheric Modelling System). The aim is to document the life cycle of MCS structures and to identify key cloud microphysical processes and their signatures with the use of synthetic observations. Synthetic observations from 95 GHz cloud Radar (equivalent reflectivity factor and doppler velocity), and IR Radiometer (brightness temperatures in 3 channels within the thermal window) are calculated from the output fields of the model. Calculations of the observables are achieved considering different viewing geometries: ground, aircraft or space. The comparisons of synthetic observations with on site measurements are used to evaluate the model at different scales. Good agreements with direct comparisons are found. Microphysical signatures on remote sensing observations are also studied using joint histograms. Analysis of both radar reflectivity and doppler velocity frequency distributions show that the model is too much favouring ice/liquid interactions (riming processes) and not enough ice/ice interactions (aggregation processes) even in the anvil part of the MCS. Nevertheless, the variability of the particle size distributions diagnosed in the anvil part from the 7 hydrometeor species simulated is in good agreement with the particle size distributions observed from aircraft in-situ measurements.
Added by: roussot