Email: gbryan@ucar.edu
Phone: 303-497-8989
Postal Address: P.O. Box 3000, Boulder, CO, 80307-3000
Shipping Address: 3090 Center Green Drive, Boulder, CO, 80301
Professional Interests
George Bryan's main research interests are cloud dynamics and numerical model development. Recently, he has studied the intensity of squall lines, the surface-based cold pools (i.e., gravity currents) in mesoscale convective systems, the triggering and spacing of orographic rainbands, the resolution dependence of convective processes in numerical models, and the maximum intensity of tropical cyclones.
Recent Work
Recent Peer-Reviewed Journal Articles:
- Stern, D. P., J. D. Kepert, G. H. Bryan, and J.D. Doyle, 2020: Understanding atypical mid-Level wind speed maxima in hurricane eyewalls. J. Atmos. Sci., in press, doi:10.1175/JAS-D-19-0191.1
- Cione, J. J., G. H. Bryan, R. Dobosy, J. A. Zhang, G. de Boer, A. Aksoy, J. B. Wadler, E. A. Kalina, B. A. Dahl, K. Ryan, J. Neuhaus, E. Dumas, F. D. Marks, A. M. Farber, T. Hock, and X. Chen, 2019: Eye of the Storm: Observing Hurricanes with a Small Unmanned Aircraft System. Bull. Amer. Meteor. Soc., in press, doi:10.1175/BAMS-D-19-0169.1.
- Shi, X., R.M. Enriquez, R.L. Street, G.H. Bryan, and F.K. Chow, 2019: An Implicit Algebraic Turbulence Closure Scheme for Atmospheric Boundary Layer Simulation. J. Atmos. Sci., in press, doi:10.1175/JAS-D-18-0375.1.
- Hutson, A., C. Weiss, and G. Bryan, 2019: Using the Translation Speed and Vertical Structure of Gust Fronts to Infer Buoyancy Deficits within Thunderstorm Outflow. Mon. Wea. Rev., in press, 10.1175/MWR-D-18-0439.1.
- Peng, K., R. Rotunno, G.H. Bryan, and J. Fang, 2019: Evolution of an Axisymmetric Tropical Cyclone before Reaching Slantwise Moist Neutrality. J. Atmos. Sci., 76, 1865-1884, doi:10.1175/JAS-D-18-0264.1.
- Shi, X., F. K. Chow, R. L. Street, and G. H. Bryan, 2019: Key elements of turbulence closures for simulating deep convection at kilometer‐scale resolution. Journal of Advances in Modeling Earth Systems, 11, doi:10.1029/2018MS001446.
- Stern, D.P. and G.H. Bryan, 2018: Using simulated dropsondes to understand extreme updrafts and wind speeds in tropical cyclones. Mon. Wea. Rev., 146, 3901–3925, doi:10.1175/MWR-D-18-0041.1.
- Peng, K., R. Rotunno, and G. H. Bryan, 2018: Evaluation of a time-dependent model for the intensification of tropical cyclones. J. Atmos. Sci., in press, doi:10.1175/JAS-D-17-0382.1.
- Shi, X., F. K. Chow, R. L. Street, and G. H. Bryan, 2018: An evaluation of LES turbulence models for scalar mixing in the stratocumulus-capped boundary layer. J. Atmos. Sci., in press, doi:10.1175/JAS-D-17-0392.1.
- Rotunno, R., and G. H. Bryan, 2018: Numerical simulations of two-layer flow past topography. Part I. The lee-side hydraulic jump. J. Atmos. Sci., in press, doi:10.1175/JAS-D-17-0306.1.
- Shi, X., H. L. Hagen, F. K. Chow, G. H. Bryan, and R. L. Street, 2018: Large-eddy simulation of the stratocumulus-capped boundary layer with explicit filtering and reconstruction turbulence modeling. J. Atmos. Sci., 75, 611-637, doi:10.1175/JAS-D-17-0162.1.
- Diao, M., G. H. Bryan, H. Morrison, and J. B. Jensen, 2017: Ice nucleation parameterization and relative humidity distribution in idealized squall line simulations. J. Atmos. Sci., 74, 2761-2787, doi:10.1175/JAS-D-16-0356.1.
- Worsnop, R. P., J. K. Lunquist, G. H. Bryan, R. Damiani, and W. Musial, 2017: Gusts and shear within hurricane eyewalls can exceed offshore wind-turbine design standards. Geophys. Res. Lett., 44, 6413-6420, doi:10.1002/2017GL073537.
- Worsnop, R. P., G. H. Bryan, J. K. Lunquist, and J. A. Zhang, 2017: Using large-eddy simulations to define spectral and coherence characteristics of the hurricane boundary layer for wind-energy applications. Bound.-Layer Meteor., in press, doi:10.1007/s10546-017-0266-x.
- Miyamoto, Y., G. H. Bryan, and R. Rotunno, 2017: An analytical model of maximum potential intensity for tropical cyclones incorporating the effect of ocean mixing. Geophys. Res. Lett., 44, 5826-5835, doi:10.1002/2017GL073670.
- Rotunno, R., P. M. Markowski, and G. H. Bryan, 2017: `Near-ground' vertical vorticity in supercell thunderstorm models. J. Atmos. Sci., 74, 1757-1766, doi:10.1175/JAS-D-16-0288.1.
- Nolan, D. S., N. A. Dahl, G. H. Bryan, and R. Rotunno, 2017: Tornado vortex structure, intensity, and surface wind gusts in large-eddy simulations with fully developed turbulence. J. Atmos. Sci., 74, 1573-1597, doi:10.1175/JAS-D-16-0258.1.
- Bryan, G. H., N. A. Dahl, D. S. Nolan, and R. Rotunno, 2017: An eddy injection method for large-eddy simulations of tornado-like vortices. Mon. Wea. Rev., 145, 1937-1961, doi:10.1175/MWR-D-16-0339.1.
- Dahl, N. A., D. S. Nolan, G. H. Bryan, and R. Rotunno, 2017: Using high-resolution simulations to quantify underestimates of tornado intensity from in situ observations. Mon. Wea. Rev., 145, 1963-1982, doi:doi:10.1175/MWR-D-16-0346.1.
- Bryan, G. H., R. P. Worsnop, J. K. Lundquist, and J. A. Zhang, 2017: A simple method for simulating wind profiles in the boundary layer of tropical cyclones. Bound.-Layer Meteor., 162, 475-502, doi:10.1007/s10546-016-0207-0.
Recent Presentations:
- Two approaches for studying cold pools in shear (pdf file): 2016 Conference on Severe Local Storms, Portland, OR: November 2016
- An eddy injection method for large-eddy simulations of tornado-like vortices (pdf file): 2016 Conference on Severe Local Storms, Portland, OR: November 2016
- Dissipative heating in the WRF model (pdf file): 2015 WRF Users Workshop, Boulder, CO: June 2015
- A simple method for simulating tropical-cyclone boundary layers (pdf file): 2015 AGU Fall Meeting, San Francisco, CA: 18 December 2015
- What is RKW Theory? (pdf file): 26th Conference on Severe Local Storms, Nashville, TN: 5 November 2012
- A primer on cloud-resolving modeling (pdf file): ASP Seminar, NCAR: 30 November 2011
- Effects of uncertainties in numerical models of hurricanes (pdf file): Seminar, Florida State University, Meteorology Program: 10 November 2011
- Reconciling observations and numerical simulations of a mesoscale convective system (pdf file): Seminar, University of Reading, Department of Meteorology: 10 October 2011
- The effects of small-scale turbulence on maximum hurricane intensity (pdf file): Presentation at 2009 Mesoscale Processes Conference, Salt Lake City, UT: 19 August 2009
- A conceptual framework for the resolution dependence of updraft properties in cloud system resolving models (pdf file): Invited Presentation at 2008 AGU Fall Meeting, San Francisco, CA: 18 December 2008
- Persistent low-level mesocyclones in simulated supercell thunderstorms (pdf file, 2 MB): Poster Presentation with Leigh Orf (Central Michigan University), 24th Conference on Severe Local Storms, Savannah, GA: 29 October 2008
- Energy conservation in compressible nonhydrostatic solvers (pdf file): Global Atmospheric Core Workshop, Boulder, CO: 23 September 2008
- The maximum intensity of hurricanes in axisymmetric numerical models (pdf file): 28th Conference on Hurricanes and Tropical Meteorology, Orlando, FL: 2 May 2008
Recent Conference Papers:
- Kalina, E. A., K. Friedrich, H. Morrison, and G. H. Bryan, 2014: Aerosol effects on simulated supercell thunderstorms in environments with different relative humidity and vertical wind shear. Preprints, 14th Conference on Cloud Physics, Amer. Meteor. Soc., Boston, MA, 292.
- Nowotarski, C. J., P. M. Markowski, Y. P. Richardson, and G. H. Bryan, 2012: The influence of horizontal convective rolls on the morphology of low-level rotation in idealized simulations of supercell thunderstorms. Preprints, 26th Conference on Severe Local Storms, Amer. Meteor. Soc., Nashville, TN, 11B.4.
- G. H. Bryan, 2012: What is RKW Theory?. Preprints, 26th Conference on Severe Local Storms, Amer. Meteor. Soc., Nashville, TN, 4B.6.
- Nowotarski, C. J., P. M. Markowski, Y. P. Richardson, and G. H. Bryan, 2010: Simulating supercell thunderstorms in a horizontally heterogeneous convective boundary layer. Preprints, 25th Conference on Severe Local Storms, Amer. Meteor. Soc., Denver, CO, 13A.3.
- Bryan, G. H., R. Rotunno, and Y. Chen, 2010: The effects of turbulence on hurricane intensity. Preprints, 29th Conference on Hurricanes and Tropical Meteorology, Amer. Meteor. Soc., Tucson, AZ, 8C.7.
- Bryan, G. H., and R. Rotunno, 2009: The effects of small-scale turbulence on maximum hurricane intensity. Preprints, 13th Conference on Mesoscale Processes, Salt Lake City, UT, Amer. Meteor. Soc., 14.2.
- Bryan, G. H., 2008: Evaluation of the theoretical speed and depth of gravity currents using three-dimensional numerical simulations. Preprints, 24th Conference on Severe Local Storms, Savannah, GA, Amer. Meteor. Soc., 10.1.
- Morrison, H., G. Bryan, and G. Thompson, 2008: Impact of cloud microphysics on the development of trailing stratiform precipitation in squall lines. Preprints, 15th International Conference on Clouds and Precipitation, Cancun, Mexico, IAMAS, P3.21.
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