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June 18, 2021 - 10:00 am
End
June 18, 2021 - 11:00 am
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School of Meteorology (Defense)School of Meteorology MS Thesis Defense
Modeling CCN effects on Electrification within High and Low Precipitation Supercells
Jessica Blair
Friday, June 18th
10:00am
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Cloud condensation nuclei (CCN) are known to affect both the electrical and the dynamic evolution of storms, but the effects on storm electrification in different storm modes has not been thoroughly examined. We will detail the impacts of CCN in simulations of the high-precipitation Geary, Oklahoma supercell storm from the Thunderstorm Electrification and Lightning Experiment (TELEX) on 29-30 May 2004, as well as in the simulations of the lower-precipitation Kimball, Nebraska supercell storm from the Stratosphere-Troposphere Experiment: Radiation, Aerosols, and Ozone-A (STERAO-A) on 10 July 1996. The simulations were run and analyzed using five different CCN concentrations (100, 300, 500, 1000, and 2000 cm-3) in the Collaborative Model for Multi-scale Atmospheric Simulation (COMMAS), a three-dimensional cloud model with a bulk electrification scheme and were run using a three-moment microphysics scheme with six hydrometeor types, utilizing both inductive and non-inductive charging for electrification. The simulations provide details on storm dynamics, kinematics, and electrification that cannot be observed directly with a controlled change in a single variable, the CCN. The CCN concentration of each model run significantly affected the storm dynamics, kinematics, and electrification in both storms. There were differences in storm polarity, the location, and timing of electrification across the different CCN concentrations.
Similar patterns were observed in both case studies. In both case studies, very low CCN concentrations were found to have opposite polarity than that of higher CCN concentrations. The overall evolution of the storm also differed with CCN concentration including the spatial extent (horizontal and vertical), lifetime of the storm, as well as the evolution of warm and cold rain processes. These variables were analyzed and compared for both the TELEX and STERAO-A case studies. Upon analysis, differences due to CCN concentration were present regardless of amount of precipitation within the storm. Further sensitivity studies were conducted using various non-inductive charging and microphysics schemes. Results from the simulations of both case study were compared to observations collected during the TELEX and STERAO-A field campaigns.
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Meeting ID: 959 0547 3215
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