14.3 WRF-Chem Simulations of Lightning-NOx Production and Trace Gas Transport in Oklahoma and Colorado Thunderstorms Observed during DC3

Wednesday, 25 January 2017: 4:30 PM
4C-3 (Washington State Convention Center )
Kristin A. Cummings, University of Maryland, College Park, MD; and K. E. Pickering, M. C. Barth, M. M. Bela, Y. Li, D. J. Allen, E. Bruning, V. C. Chmielewski, D. R. MacGorman, S. A. Rutledge, B. Basarab, B. R. Fuchs, T. Davis, A. Weinheimer, I. Pollack, T. B. Ryerson, F. Flocke, T. Campos, G. S. Diskin, L. Carey, R. M. Mecikalski, C. Ziegler, E. R. Mansell, M. Biggerstaff, D. P. Betten, E. DiGangi, R. Doherty, and D. Finney

The focus of this analysis is on the production of nitrogen oxides by lightning (LNOx), and on the transport and distribution of other trace gases for two thunderstorms observed during the Deep Convective Clouds and Chemistry (DC3) field campaign in May-June 2012. The Weather Research and Forecasting Chemistry (WRF-Chem) model is used to perform cloud-resolved simulations for the May 29-30 Oklahoma severe convection, which contained one supercell, and the June 6-7 Colorado squall line. Aircraft and ground-based observations (e.g., trace gases, lightning and radar) collected during DC3 are used in comparisons against the model-simulated lightning flashes generated by the flash rate parameterization schemes (FRPSs) incorporated into the model, as well as the model-simulated LNOx predicted in the anvil outflow. Newly-developed FRPSs based on DC3 radar observations and Lightning Mapping Array data are implemented in the model, along with previously developed schemes from the literature. The results of these analyses will also be compared between storms to investigate which FRPSs were most appropriate for the two types of convection and to examine the variation in the LNOx production per flash, trace gas transport, and ozone production in storm outflow. The simulated LNOx results from WRF-Chem will also be compared against other previously studied mid-latitude thunderstorms.
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