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Journal Article: BibTeX citation key:  Guy2013
Guy, N., Zeng, X., Rutledge, S. A. & Tao, W.-K. (2013) Comparing the convective structure and microphysics of two Sahelian mesoscale convective systems: Radar observations and CRM simulations. IN Monthly Weather Review, 141. 582–601.
Added by: Nick Guy 2013-05-06 16:32:01
 B  
Categories: Weather to Climatic modelling and forecasting
Keywords: AMMA, Clouds - Convection, Modelling, Precipitation, Sahel, Western Africa
Creators: Guy, Rutledge, Tao, Zeng
Collection: Monthly Weather Review

Peer reviewed
Number of views:  775
Popularity index:  41.01%

 
Abstract
Two mesoscale convective systems (MCSs) observed during the African Monsoon Multidisciplinary Analyses (AMMA) experiment are simulated using the three-dimensional (3D) Goddard Cumulus Ensemble model. This study was undertaken to determine the performance of the cloud-resolving model in representing distinct convective and microphysical differences between the two MCSs over a tropical continental location. Simulations are performed using 1-km horizontal grid spacing, a lower limit on current embedded cloud- resolving models within a global multiscale modeling framework. Simulated system convective structure and microphysics are compared to radar observations using contoured frequency-by-altitude diagrams (CFADs), calculated ice and water mass, and identified hydrometeor variables. Vertical distributions of ice hydrome- teors indicate underestimation at the mid- and upper levels, partially due to the inability of the model to produce adequate system heights. The abundance of high-reflectivity values below and near the melting level in the simulation led to a broadening of the CFAD distributions. Observed vertical reflectivity profiles show that high reflectivity is present at greater heights than the simulations produced, thought to be a result of using a single-moment microphysics scheme. Relative trends in the population of simulated hydrometeors are in agreement with observations, though a secondary convective burst is not well represented. Despite these biases, the radar-observed differences between the two cases are noticeable in the simulations as well, sug- gesting that the model has some skill in capturing observed differences between the two MCSs.
Added by: Nick Guy