Convective Meteorology (Mesoscale Dynamics)

Seamless global-to-regional convection-resolving simulations of severe storms and hurricanes

Dr. Lucas Harris

NOAA/Geophysical Fluid Dynamics Laboratory

12 April 2016, 1:30 PM

National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

With greater computer power, increasingly high-resolution global weather and climate models are being developed and used. The most recent generation of models are beginning to approach scales in which nonhydrostatic effects can no longer be neglected. Further, even with enhanced computing power, uniformly-high resolution global models are not always feasible, requiring the use of either limited-area models or refined-grid global models.

The GFDL cubed-sphere finite-volume dynamical core, FV3, is an atmosphere dynamical core capable for simulation on all scales, from low-resolution climate modeling to convection-resolving short-term weather prediction, and has been able to couple to a very broad array of physics packages and earth-system components. FV3 is capable of both hydrostatic and nonhydrostatic dynamics, and is also capable of local grid refinement using grid stretching and grid nesting. In both idealized tests and as part of the GFDL High-Resolution Atmosphere Model (HiRAM) there are clear benefits to the enhanced resolution from grid refinement, especially in orographic precipitation, hurricane intensity, the diurnal cycle of warm-season precipitation, and in the simulation of severe thunderstorms.

Convective Meteorology (Mesoscale Dynamics) Seminar Series website