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A senior at Penn State majoring in meteorology, Nick Geyer spent his summer at CMMAP visualizing and animating data created by the Vector Vorticity Cloud Model (VVCM) used to simulate the winter 2006 sixteen day Tropical Warm Pool - International Cloud Experiment (TWP-ICE) data collected by the Atmospheric Radiation Measurement Program (ARM) and Australian Bureau of Meteorology in Darwin, Austrailia. Nick's summer advisor was Professor David Randall and he received guidance from researchers Celal Konor and Tom Cram.

The VVCM is a non-hydrostaic, anelastic cloud resolving model based on the vector vorticity equation which allows the model to directly derive velocities from vorticity and simplify the problem of boundary conditions at the surface of complex terrains. Nick used Fortran 90 programs and IDL to analyze and visualize the output data. The three dimensional visualization of cloud data represented cloud water mass mixing ratio from .4 to 1.4 g/kg and accurately described the relative sizes, advective properties, and growth of convective clouds over the experiment's domain. To reaffirm their three dimensional output, X-Y graphs of cloud water mass mixing ratios, vertical velocities, and cloud top temperatures represented moist thermal plumes and cloud tops. From these graphs and analyses, Nick found that the VVCM is behaving correctly as a cloud resolving model in the case of the TWP-ICE experiment. As a followup, Nick suggested further work should continue to enhance the VVCM's structure and output by testing the ARM 1997 land experiment over Oklahoma.

Nick's research interests include atmospheric dynamics, climate dynamics, air quality, and dispersion. Outside of research and school, he has a lot of hobbies including camping, hiking, soccer, football, swimming, cooking, drawing, music, the Boy Scouts of America, Theta Chi Fraternity, and Chi Epsilon Pi.

Nick's research poster may be found here, Simulation of the TWP-ICE Case with the Vector Vorticity Cloud Model, 2MB PDF.

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