4B.6 Gravity Wave Physics and Dynamics in the FV3-based Atmosphere Models Extended into the Mesosphere

Monday, 4 June 2018: 5:15 PM
Colorado B (Grand Hyatt Denver)
Valery A. Yudin, Colorado Univ., Boulder, CO; and R. A. Akmaev, J. C. Alpert, T. J. Fuller-Rowell, and S. I. Karol

The energy and momentum of mesoscale Gravity Waves (GWs) influence the large-scale circulation, transport and energy balance through the entire atmosphere. Changes in the treatment of the sub-grid GW physics can affect simulations of solar-terrestrial coupling, depletion and recovery of ozone, frequency of sudden stratospheric warmings, and intra-seasonal winter-spring transitions. In the tropics, GWs control appearance and characteristics of equatorial quasi-biennial and semiannual oscillations. Realistic representations of these GW-controlled phenomena by model dynamical cores and sub-grid scale physics can substantially improve global forecasting from 7-10 days to several weeks, and bring realism to the sub-seasonal and climate predictions in the stratosphere, mesosphere, and lower thermosphere. The paper presents the first implementation of the Unified Gravity Wave Physics (UGWP) in the 128-level FV3GFS global atmosphere model extended into the mesosphere along with diagnostics of the mesoscale waves resolved by FV3 dynamical core. We will discuss sensitivity of the monthly FV3GFS forecasts to formulations of GW schemes, including choice of the uncertain parameters, wave sources, and scale-sensitive adjustment of schemes to model resolutions. First steps to develop the scale-aware coupling between GW physics and dynamics for the FV3-based climate and weather models with resolutions spanned from ~100 km to ~6-12 km will be discussed.
- Indicates paper has been withdrawn from meeting
- Indicates an Award Winner