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Please join us March 14, 2 p.m. - 3:30 p.m. in the NCAR Mesa Lab Main Seminar Room for presentations from three of the Accelerated Scientific Discovery (ASD) projects that have been among the first to put CISL's new 1.5-petaflops Yellowstone system through its paces.Each of the speakers will discuss the team's experiences in using Yellowstone, where the system performed well (or not), and when available, some early results from their runs. The presentation will be webcast (URL tbd) for those unable to attend in person.The following speakers will present during the session: Gabriele Pfister, ACD -- Prediction of North American air qualityHigh-resolution simulations with the nested regional climate model with chemistry (NRCM-Chem) are being performed to study possible changes in weather and air quality over North America between present-day and two future time periods: 2020-2030 and 2045-2055. The performed simulations are targeting insights into expected future changes related to air quality and will also be used for dynamical downscaling (of meteorology and air quality) of global climate simulations performed at NCAR in support of the 2013 IPCC AR5. The project is using NRCM-Chem over the conterminous U.S. at a resolution of 12 x 12 km2 with inclusion of atmospheric chemistry to examine impacts on air quality and other regional climate processes.Justin Small, CGD -- Meso- to planetary-scale processes in a global ultra-high-resolution climate modelIn this project, the main computational objective is to perform and assess high-resolution Community Earth System Model (CESM) simulations in order (1) to investigate the climate response to the coupling of ocean and atmosphere mesoscale features, (2) to assess the ability of a high-resolution and frequently coupled (two-hour) ocean and atmosphere simulation to represent near-inertial waves in the ocean, and (3) to investigate the role of small-scale ice features such as polynyas in the climate system.David Richter, MMM -- Turbulence modification in the spray-laden atmospheric marine boundary layerThis project is focused on the effect that sea spray, suspended by turbulence in the high-wind marine atmospheric boundary layer, has on both the turbulence itself as well as the transfer of momentum and heat to the ocean surface. To study this problem, a fundamental approach is taken where direct numerical simulation (DNS) coupled with Lagrangian particle-tracking is employed to focus generally on how a dispersed phase (such as sea spray) modifies turbulence. Systematic runs of turbulent Couette flow at multiple Reynolds numbers, each with various particle sizes, time scales, and concentrations, are being performed to identify the critical mechanisms of turbulence modification, as well as to determine the extent to which suspended particles can affect transport of heat and momentum.