Charlotte Wainwright
School of Meteorology
The University of Oklahoma, Norman, OK
15 October 2009, 10:00 AM
National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK
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In order to model convective storms effectively, accurate microphysics are vital. The trade-off between microphysical scheme complexity and computational cost is widely recognized. To overcome the increased computational cost of multi-moment microphysics schemes, we seek ways to increase the accuracy of the single-moment scheme.
In this study a diagnostic relation between rain droplet size distribution (DSD) parameters and the third moment of the DSD is derived from model output and implemented in the Milbrandt and Yau (2005) single-moment microphysics in the ARPS model. Simulations of the 3 May 1999 tornadic supercell case are performed using the diagnostic relation with single-moment microphysics, and the results are compared to simulations using the original single- and double-moment microphysics schemes.
Diagnostic relations are also formed for other frozen hydrometeor categories and the results of simulations performed using these relations will be discussed.
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