Ocean

                                                                                                                                                           (home)

Todd Ringler
Los Alamos National Laboratory, Theoretical Division, Fluid Dynamics Group
MS B216, Los Alamos, New Mexico 87545
(505) 667-7744 ringler@lanl.gov http://public.lanl.gov/ringler

Education
• Doctor of Philosophy in Atmospheric Science, Cornell University, May 1996.
• Master of Science in Aerospace Engineering, Cornell University, May 1992.
• Bachelor of Science in Aerospace Engineering, Summa Cum Laude West Virginia University, May 1990.

Research Interests
 • using coupled climate models to characterize regional climate change impacts
 • modeling and understanding the global coupled climate system
 • developing numerical methods for improving climate system simulations
 • understanding the intersection of science and policy

Professional Experience
   • 2006- : Technical Staff Member, Theoretical Division, Fluid Dynamics Group, Los Alamos National Laboratory, Los Alamos, New Mexico,
         Research: ocean modeling, regional climate change prediction, numerical methods.
   • 1996-2005: Research Scientist III, Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado,
         Research: climate dynamics, atmosphere-land-ocean interactions, numerical methods.
   • 1992-1992: NASA Global Climate Change Fellow, Atmospheric Sciences Program, Cornell University, Ithaca, NY
          Research: Impact of mountain ranges on climate
   • 1990-1992: Graduate Research Assistant, Aerospace Engineering, West Virginia University, Morgantown, West Virginia
   • 1989-1990: NSF sponsored Undergraduate Researcher, West Virginia University

 Positions
   • Editor, Monthly Weather Review
   • Member of External Advisory Committee, Cornell University, Department of Earth and Atmospheric Science 
   • Member of New Mexico's NSF EPSCoR Management Team 
   • Associate Editor, Monthly Weather Review, 2006-2007

Policy Experience
 • 2005: Bighorn Center for Public Policy Fellow, Resource Sustainability Program,
          Developed policy and legislation related to sustainability and the environment.
 • 2003- : Collaborating with TNC Climate Change Initiative,
          How can we use climate change simulations to inform TNC decision-making process?
 • 2005: Colorado Institute for Leadership Training,
         What is the interplay between science and policy?

Teaching Experience
   • 2004-2005: Developed and taught "The Science of Climate Change", a Freshman Seminar Course at Colorado State University
   • 1996-2002: Instructor for Colorado State University Outdoor Adventure Program.
         Taught courses ranging from Ice Climbing, Mountaineering, to Advanced Rock Climbing.
   • 1992-1996: Senior Instructor for Cornell Outdoor Education Program.
         Taught courses ranging from Natural History to Outdoor Leadership.

Selected Refereed Publications
• Ringler, T., L. Ju and M. Gunzburger, 2008, A multiresolution method for climate system modeling: application of spherical centroidal Voronoi tessellations, Ocean Dynamics: DOI 10.1007/s10236-008-0157-2

• Zupanski, M, S.J. Fletcher, I.M. Navon, B. Uzunoglu, R. Heikes, D. Randall, T.D. Ringler, and D. Daescu, 2006, Initiation of ensemble data assimilation, Tellus, 58, 159-170.

• Lipscomb, W.H. and T. D. Ringler, 2005: An Incremental Remapping Transport Scheme on a Spherical Geodesic Grid, Monthly Weather Review, 133, 2335-2350.

• Bonaventura, L. and T. D. Ringler, 2005: Analysis of Discrete Shallow-Water Models on Geodesic Delaunay Grids with C-Type Staggering. Monthly Weather Review, 133, 2351 2373.

• Randall, D.A., T.D. Ringler, R. Heikes, P. Jones, and J. Baumgardner, 2002: Climate Modeling with Spherical Geodesic Grids, Computing in Science and Engineering, 4, 32-41.

• Ringler, T.D., and D.A. Randall, 2002: A potential enstrophy and energy conserving numerical scheme for solution of the shallow-water equations on a geodesic grid, Monthly Weather Review, 130, 1397-1410.

• Ringler, T.D., and D.A. Randall, 2002: The ZM-grid: An alternative to the Z-grid, Monthly Weather Review,130, 1411-1422.

• Ringler, T.D., R. Heikes, and D.A. Randall, 2000: Modeling the atmospheric general circulation using a spherical geodesic grid: A new class of dynamical cores, Monthly Weather Review, 128, 2471-2489.

• Ringler, T.D., and K.H. Cook, 1999: Understanding the seasonality of orographically-forced stationary waves: Interaction between mechanical and thermal forcing. Journal of Atmospheric Sciences, 56, 1154- 1171.

• Ringler, T.D., and K.H. Cook, 1997: Importance of nonlinearity in orographically-forced stationary waves. Journal of Atmospheric Sciences, 54, 2612-2629.

• Lenters, J.D., K.H. Cook, and T.D. Ringler, 1995: Comments on On the influence of the Andes on the general circulation of the Southern Hemisphere. Journal of Climate, 8, 2113 2115.

• Ringler, T.D., and K.H. Cook, 1995: Orographically-induced stationary waves: Dependence on latitude. Journal of Atmospheric Sciences, 52, 2548-2560.

Book Chapters
• Randall, D.A., T.D. Ringler, and R. Heikes, 2000: Global atmospheric modeling using a geodesic grid and an isentropic vertical coordinate. In: D.A. Randall (Ed.), General Circulation Model Development, International Geophysics Series, vol. 90, Academic Press, New York, 509-536.
• Ringler, T.D., R. Heikes, and D.A. Randall, 1998: Solving the primitive equations on a spherical geodesic grid: A technical report to a new class of dynamical cores. Atmospheric Science Paper No. 665. Colorado State University. 62 pp.

Selected Presentations
• Ringler, T.D., 2006: Complex Systems: Energy, Climate, Environment, and Risk Assessment, LANL Grand Challenges Workshop, Los Alamos, November 1, 2006.
• Ringler, T.D., 2006: Grids for Climate System Modeling, TSC Workshop on Meshing Challenges for LANL Simulations, Los Alamos, New Mexico, October 30, 2006.
• Ringler, T.D., 2006: Risk Analysis and Climate Change, Presented to the PARADIGM Decisions Applications Group, Los Alamos, New Mexico, October 10, 2006.
• Ringler, T.D., 2006: New numerical methods in ocean general circulation modeling: Voronoi tessellations and floating vertical coordinates, Monterey, California, June 26, 2006.
• Ringler, T.D., 2005: Challenges in Coupled Climate Model Development, Presented to the Coupled Ocean Sea-Ice Modeling Group, Los Alamos, New Mexico, May 16, 2005.
• Ringler, T.D., 2005: Challenges in Coupled Climate Model Development, Presented to the Coupled Ocean Sea-Ice Modeling Group, Los Alamos, New Mexico, May 16, 2005.
• Ringler, T.D., D. Randall, and J. Baumgardner, 2003: A Global Ocean Model based on Icosahedral- Hexagonal Grids with a Hybrid Vertical Coordinate, Presented at the American Geophysical Union Conference, San Fransico, December 11, 2003.
• Ringler, T.D., 2003: Comparing Truncation Error to PDE Solution Error on Spherical Voronoi Tessellations. Presented at the Workshop on Current Development of Shallow-Water Models on the Sphere, March 10, 2003, Munich, Germany.
• Ringler, T.D., 2003: An Integrated Approach to Coupled Climate Modeling based on Geodesic Grids and Quasi-Lagrangian Vertical Coordinates. Invited Presentation at the Max Planck Institute for Meteorology, February 27, 2003, Hamburg, Germany.
• Ringler, T.D., 2002: Geodesic grids for ocean modeling. Presented at the MIT Ocean Modeling Meeting, August 21-23, 2002, Cambridge, Massachusetts. Ringler, T.D., M. Branson, and D.A. Randall, 2002: Impact of an energy conserving scheme in the CSU AGCM. Presented at the 2002 PDEs on the Sphere Workshop, August 12-15, 2002, Toronto, Canada.
• Ringler, T.D. and D.A. Randall, 2002: Development of an energy conserving numerical scheme suitable for geodesic grids. Presented at the CCSR Workshop for the Next Generation Climate Models, March 4-8, 2002, Awaji-Yumebutai, Japan.
• Ringler, T.D., D.A. Randall, J. Baumgardner, and B. Semtner, 2002: Our strategy for designing a geodesic grid ocean GCM with a hybrid vertical coordinate. Presented at the Layered Ocean Modeling Workshop, February 6-8, 2002, Miami, Florida.
• Ringler, T.D. and D.A. Randall, 2002: An integrated approach to coupled climate modeling based on geodesic grids and quasi-Lagrangian vertical coordinates. Presented at the 13th Symposium on Global Change and Climate Variations, January 14, 2002, Orlando Florida.
• Ringler, T.D. and D.A. Randall, 2002: Interactions of monsoons and anticyclones. Presented at the 13th Symposium on Global Change and Climate Variations, January 14, 2002, Orlando Florida.
• Ringler, T.D. and D.A. Randall, 2001: Geodesic Grids and Data Analysis. Presented at the Earth Observing System Working Group Meeting, November 1, 2001, San Antonio, Texas
• Ringler, T.D. and D.A. Randall, 2001: Energy, geostrophic adjustment, and a momentum analog to the Z-grid. Presented at 7th Workshop on the Solution of Partial Differential Equations on the Sphere, May 16-18, 2001, Montreal, Canada.
• Ringler, T.D., R. Heikes, and D.A. Randall, 1999: Modeling the Atmospheric General Circulation Using a Spherical Geodesic Grid. Presented at 8th Workshop on the Solution of Partial Differential Equations on the Sphere, November 30 - December 3, 1999, San Francisco, California.
• Ringler, T.D., R. Heikes, and D.A. Randall, 1999: Modeling the Atmospheric General Circulation Using a Spherical Geodesic Grid: A New Class of Dynamical Cores. Invited Presentation, NCAR CGD Seminar Series. May 6, 1999, Boulder, Colorado.
• Dazlich, D.A., T.D. Ringler, and D.A. Randall, 1998: High resolution surface flux calculations with the Colorado State University general circulation model. Presented at the 9th Conference on Interaction of the Sea and Atmosphere, January 11-16, 1998, Phoenix, Arizona.
• Ringler, T.D. and K.H. Cook, 1997: Nonlinearly-forced stationary waves by orography: Interaction between mechanical and thermal forcing. Presented at the 11th Conference on Atmospheric and Oceanic Fluid Dynamics, June 23-27, 1997, Tacoma, Washington.
• Ringler, T.D. and K.H. Cook, 1995: Nonlinear forcing of stationary waves. Presented at the 10th Conference on Atmospheric and Oceanic Waves and Stability, June 5-9, 1995, Big Sky, Montana.