Dr. Delgado and Ms. Bucci presented a seminar on “A 2 km Basin Scale Nature Run for a Hurricane Regional OSSE System“.
A realistic Nature Run is the foundation to a useful Observing System Simulation Experiment (OSSE) framework. A high-resolution, Basin Scale Nature Run (BSNR) using the Non-hydrostatic Multiscale Model on the B grid (NMM-B) is presented. The BSNR provides the foundation for a hurricane OSSE system. NASA’s global, 7 km GEOS-5 Nature Run (G5NR) provided the initial and boundary conditions. The BSNR used a 2 km horizontal resolution covering the entire North Atlantic basin and 61 vertical levels. Previous regional nature runs relied on nesting and hence had a relatively small area with data at high resolution. The BSNR uses a fixed large grid, which allows for simulation of high-resolution data throughout the domain. Model outputs of the entire domain are available at 30 minute intervals. Another advantage of using a large, uniformly high resolution domain with the G5NR as the background is that it allows multiple tropical cyclones (TCs) to be investigated. A hurricane originating in the southern Gulf of Mexico and making landfall along the Alabama/Florida Gulf coast is studied. The TC structure and environment are evaluated and presented.
A recording of the presentation is available on the anonymous ftp site: ftp://ftp.aoml.noaa.gov/pub/hrd/blog/seminars/2017/Delgado%26Bucci_HRD_Seminar_20170818.mp4