P3A.12
Simulated radar characteristics of LBA convective systems: easterly and westerly regimes
Stephen E. Lang, SSAI / NASA GSFC, Greenbelt, MD; and W. K. Tao and R. Cifelli
The 3D Goddard Cumulus Ensemble (GCE) model was used to simulate convection that occurred during the TRMM LBA field experiment in Brazil. Convection in this region can be categorized into two different regimes. Low-level easterly flow results in moderate to high CAPE and a drier environment. Convection is more intense like that seen over continents. Low-level westerly flow results in low CAPE and a moist environment. Convection is weaker and more widespread characteristic of oceanic or monsoon-like systems. The GCE model has been used to study both regimes in order to provide cloud datasets that are representative of both environments in support of TRMM rainfall and heating algorithm development.
Two different cases are analyzed: Jan 26, 1999, an easterly regime case, and Feb 23, 1999, a westerly regime case. The Jan 26 case is an organized squall line, while the Feb 23 case is less organized with only transient lines. Radar signatures, including CFADs, from the two simulated cases are compared to each other and with observations. The microphysical processes simulated in the model are also compared between the two cases.
Poster Session 3A, TRMM/GPM Poster
Friday, 8 August 2003, 1:30 PM-3:30 PM
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