Advancing tropical cyclone models through explicit representation of boundary layer roll vortices
Abstract
Observational, numerical, and theoretical studies have conclusively demonstrated that roll vortices are prevalent in tropical cyclone boundary layers (TCBL). The lack of roll-induced fluxes in existing TCBL parameterizations has potentially major implications for simulating or forecasting tropical cyclone (TC) intensity. The rollinduced fluxes are inherently nonlocal and non-gradient and hence cannot be captured by standard turbulence parameterizations. Thus, if the effects of TCBL roll vortices are to be included in TC models, new parameterizations of their effects are needed. Here we propose a 2-year program of research to advance the understanding and parameterization of the atmospheric boundary layer in tropical cyclone conditions as a route toward skillful prediction of tropical cyclone intensity and structure. The primary overall objectives of this proposal are to ¥ Implement a physically-based and computational-efficient parameterization of roll vortices into the U.S. NavyÕs operational COAMPS-TC prediction system; ¥ Advance the fundamental understanding of the role of roll vortices in affecting the structure and intensity of tropical cyclones. The fundamental hypothesis that guides this proposal is that rolls can significantly affect the TC intensity and structure by enhancing the vertical transports of momentum, heat and moisture in the boundary layer; and the proposed method of explicit simulations of rolls in the TCBL can be successfully applied to represent their effects in TC models. This work will be conducted in close collaboration with NRL scientists building directly upon the successes of the previous work of the URI team to improve and operationally implement tropical cyclone model upgrades for the Fleet Numerical Meteorology and Oceanography Center.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 10, 2016
- Source ID
- N000141612065
Entities
People
- Isaac Ginis
Organizations
- Office of Naval Research
- United States Navy
- University of Rhode Island