Publications


Journal Articles
  • (Under Review) Steppeler, J., J. Li, F. Fang, J. Zhu, and P. A. Ullrich (2018) "o3o3, a Variant of Spectral Elements with a Regular Collocation Grid" Submitted to Mon. Weather Rev.
  • (Under Review) Rhoades, A.M., A.D. Jones, and P.A. Ullrich (2018) "The changing character of mountains as natural reservoirs" Submitted to Geophys. Res. Lett.
  • (Early Release) Ullrich, P.A., Z. Xu, A.M Rhoades, M.D. Dettinger, J.F. Mount, A.D. Jones, and P. Vahmani (2018) "alifornia's Drought of the Future: A Midcentury Recreation of the Exceptional Conditions of 2012‐2017" Earth's Future, doi: 10.1029/2018EF001007.

  • (Under Review) Zarzycki, C.M., C. Jablonowski, J. Kent, P.H. Lauritzen, R. Nair, K.A. Reed, P.A. Ullrich, D.M. Hall, D. Dazlich, R. Heikes, C. Konor, D. Randall, X. Chen, L. Harris, M. Giorgetta, D. Reinert, C. Kuehnlein, R. Walko, V. Lee, A. Qaddouri, M. Tanguay, H. Miura, T. Ohno, R. Yoshida, J. Klemp, S.-H. Park, W. Skamarock (2018) "DCMIP2016: The splitting supercell test case" Geosci. Model. Dev., doi: 10.5194/gmd-2018-156.
  • (Under Revision) Guerra, J.E., P.A. Ullrich, and J. Bachmeister (2018) "An assessment of the Lindzen/McFarlane orographic gravity wave drag parameterization at non-hydrostatic scales" Submitted to J. Adv. Model. Earth Sys.
  • (Early Release) Herrington, A.R., P.H. Lauritzen, M.A. Taylor, S. Goldhaber, B.E. Eaton, K.A. Reed, and P.A. Ullrich (2018) "Physics-dynamics coupling with element-based high-order Galerkin methods: Quasi equal-area physics grid" Mon. Weather Rev., doi: 10.1175/MWR-D-18-0136.1.
  • (Under Review) Pinheiro, M.C., P.A. Ullrich, and R. Grotjahn (2018) "Atmospheric blocking and intercomparison of objective detection methods: Flow field characteristics" Submitted to Climate Dynamics
  • (DOI) Ullrich, P.A., D.R. Reynolds, J.E. Guerra, and M.A. Taylor (2018) "Impacts and importance of diffusion on the spectral element method: A linear analysis" J. Computat. Phys., Volume 375, pp. 427-446, doi: 10.1016/j.jcp.2018.06.035.
  • (Early Release) Millstein, D., J. Solomon-Culp, M. Wang, P.A. Ullrich, and C. Collier (2018) "Wind energy variability and links to regional and synoptic scale weather" Clim. Dyn., doi: 10.1007/s00382-018-4421-y.
  • (DOI) Lauritzen, P.H., R.D. Nair, A.R. Herrington, P. Callaghan, S. Goldhaber, J.M. Dennis, J.T. Bacmeister, B.E. Eaton, C.M. Zarzycki, Mark A. Taylor, P.A. Ullrich, T. Dubos, A. Gettelman, R.B. Neale, B. Dobbins, K.A. Reed, C. Hannay, B. Medeiros, J.J. Benedict, and J.J. Tribbia (2018) "NCAR CESM2.0 release of CAM-SE: A reformulation of the spectral-element dynamical core in dry-mass vertical coordinates with comprehensive treatment of condensates and energy" J. Adv. Model. Earth Sys., Volume 10 (7), pp. 1537-1570, doi: 10.1029/2017MS001257.
  • (DOI) Rhoades, A.M., A.D. Jones, and P.A. Ullrich (2018) "Assessing mountains as natural reservoirs with a multi-metric framework" Earth's Future, Volume 6 (9), pp. 1221-1241, doi: 10.1002/2017EF000789.
  • (DOI) Shields, C., J. Rutz, R. Leung, M. Ralph, M. Wehner, B. Kawzenuk, J. Lora, E. McClenny, T. Osborne, A. Payne, P.A. Ullrich, A. Gershunov, N. Goldenson, B. Guan, Y. Qian, A. Ramos, C. Sarangi, S. Sellars, I. Gorodetskaya, K. Kashinath, V. Kurliin, K. Mahoney, G. Muszynski, R. Pierce, A. Sabramanian, R. Tome, D. Waliser, D. Walton, G. Wick, A. Wilson, D. Lavers, Prabhat, A. Collow, H. Krishnan, G. Magnusdottir, and P. Nguyen (2018) "Atmospheric River Tracking Method Intercomparison Project (ARTMIP): Project goals and experimental design" Geosci. Model Dev., Volume 11, pp. 2455-2474, doi: 10.5194/gmd-11-2455-2018.
  • (DOI) Gardner, D.J., J.E. Guerra, F.P. Hamon, D.R. Reynolds, P.A. Ullrich, and C.S. Woodward (2018) "Implicit-Explicit (IMEX) Runge-Kutta Methods for non-hydrostatic atmospheric models" Geosci. Model Dev., Volume 11, pp. 1497-1515, doi: 10.5194/gmd-2017-285.

  • (DOI) Wang, M., P.A. Ullrich, D. Millstein (2018) "The future of wind energy in California: Future projections with the Variable-Resolution CESM" Renewable Energy, Volume 127, pp. 242-257, doi: 10.1016/j.renene.2018.04.031.
  • (DOI) Xu, Z., A.M. Rhoades, H. Johansen, P.A. Ullrich and W. Collins (2018) "An intercomparison of GCM and RCM dynamical downscaling for characterizing the hydroclimatology of California and Nevada" J. Hydrometeor., Volume 19, Number 9, pp. 1485-1506, doi: 10.1175/JHM-D-17-0181.1.
  • (DOI) Ullrich, P.A., C. Jablonowski, J. Kent, P.H. Lauritzen, R. Nair, K.A. Reed, C.M. Zarzycki, D.M. Hall, D. Dazlich, R. Heikes, C. Konor, D. Randall, T. Dubos, Y. Meurdesoif, X. Chen, L. Harris, C. Kuehnlein, V. Lee, A. Qaddouri, C. Girard, M. Giorgetta, D. Reinert, J. Klemp, S.-H. Park, W. Skamarock, H. Miura, T. Ohno, R. Yoshida, R. Walko, A. Reinecke and K. Viner (2017) "DCMIP2016: A Review of Non-hydrostatic dynamical core design and intercomparison of participating models" Geosci. Model. Dev., Volume 10, pp. 4477-4509, doi: 10.5194/gmd-10-4477-2017. [EGU Highlight Paper]
  • (DOI) Wu, C., X. Liu, Z. Lin, A.M. Rhoades, P.A. Ullrich, C.M. Zarzycki, Z. Lu and S.R. Rahimi-Esfarjani (2017) "Exploring a Variable‐Resolution Approach for Simulating Regional Climate in the Rocky Mountain Region Using the VR‐CESM" J. Geophys. Res. Atmospheres, Volume 122, Issue 20, pp. 10,939-10,965, doi: 10.1002/2017JD027008.
  • (DOI) Wang, M. and P.A. Ullrich (2018) "Marine air penetration in California's Central Valley: Meteorological drivers and the impact of climate change" J. Appl. Meteor. Clim., Volume 57, pp. 137-154, doi: 10.1175/JAMC-D-17-0089.1.
  • (DOI) Rhoades, A.M., P.A. Ullrich, C.M. Zarzycki, H.Johansen, S.A. Margulis, H. Morrison, Z. Xu and W. Collins (2017) "Sensitivity of mountain hydroclimate simulations in variable-resolution CESM to microphysics and horizontal resolution" J. Adv. Model Earth Sys.
  • (DOI) Zarzycki, C.M. and P.A. Ullrich (2017) "Assessing sensitivities in algorithmic detection of tropical cyclones in climate data" Geophys. Res. Lett., Volume 44, Issue 2, pp. 1141-1149, doi: 10.1002/2016GL071606.
  • (DOI) Huang, X. and P.A. Ullrich (2017) "The changing character of twenty-first century precipitation over the western United States in the variable-resolution CESM" J. Clim., Volume 30, Number 18, pp. 7555–7575, doi: 10.1175/JCLI-D-16-0673.1.
  • (DOI) Rhoades, A.M., P.A. Ullrich and C.M. Zarzycki (2017) "Projecting 21st century snowpack trends in western USA mountains using variable-resolution CESM" Clim. Dyn., Volume 50, Issue 1–2, pp. 261–288, doi: 10.1007/s00382-017-3606-0.
  • (DOI) Ullrich, P.A. and C.M. Zarzycki (2017) "TempestExtremes v1.0: A framework for scale-insensitive pointwise feature tracking on unstructured grids" Geosci. Model. Dev., Volume 10, pp. 1069-1090, doi: 10.5194/gmd-10-1069-2017.

  • (DOI) Lauritzen, P.H., M.A. Taylor, J. Overfelt, P.A. Ullrich, R.D. Nair, S. Goldhaber and R. Kelly (2017) "CAM-SE-CSLAM: Consistent coupling of a conservative semi-Lagrangian finite-volume method with spectral-element dynamics" Mon. Weather Rev., Volume 145, Number 3, pp. 833-855, doi: 10.1175/MWR-D-16-0258.1.
  • (DOI) Ferguson, J., C. Jablonowski, H. Johansen, P. McCorquodale, P.A. Ullrich and P. Colella (2016) "Analyzing the Adaptive Mesh Refinement (AMR) characteristics of a high-order cubed-sphere shallow water model" Mon. Weather Rev., Volume 144, Number 12, pp. 4641-4666, doi: 10.1175/MWR-D-16-0197.1.
  • (DOI) O'Brien, T.A., K. Kashinath, W. Collins, O. Rübel, S. Byna, J. Gu , H. Krishnan, P.A. Ullrich (2016) "Resolution dependence of precipitation statistical fidelity in hindcast simulations" J. Adv. Earth System Model., Volume 8, Issue 2, pp. 976-990, doi: 10.1002/2016MS000671.
  • (DOI) Huang, X. and P.A. Ullrich (2016) "Irrigation impacts on California's climate with the variable-resolution CESM" J. Adv. Earth System Model., Volume 8, Issue 3, pp. 1151-1163, doi: 10.1002/2016MS000656.
  • (DOI) Hotta, D., K. Eugenia and P.A. Ullrich (2016) "A semi-implicit modification to Lorenz N-cycle scheme and its application for integration of meteorological equations" Mon. Weather Rev. Volume 144, Number 6, pp. 2215-2233, doi: 10.1175/MWR-D-15-0330.1.
  • (DOI) Guerra, J.E. and P.A. Ullrich (2016) "A high-order staggered finite-element vertical discretization for non-hydrostatic atmospheric models" Geosci. Model. Dev. Volume 9, pp. 2007-2029, doi:10.5194/gmd-9-2007-2016.
  • (Link | DOI) Huang, X., A.M. Rhoades, P.A. Ullrich and C.M. Zarzycki (2016) "An evaluation of the variable resolution-CESM for modeling California’s climate" J. Adv. Earth System Model. Volume 8, Issue 1, pp. 345-369, doi: 10.1002/2015MS000559.
  • (Link | DOI) Ullrich, P.A., D. Devendran and H. Johansen (2016) "Arbitrary-order conservative and consistent remapping and a theory of linear maps, Part 2" Mon. Weather Rev. Volume 144, Issue 4, pp. 1529-1549, doi: 10.1175/MWR-D-15-0301.1.
  • (Link | DOI) Rhoades, A.M., X. Huang, P.A. Ullrich and C.M. Zarzycki (2016) "Characterizing Sierra Nevada snowpack using variable-resolution CESM" J. Appl. Meteor. Clim. Volume 55, Number 1, pp. 173-196, doi: 10.1175/JAMC-D-15-0156.1.
  • (DOI) Hall, D.M., P.A. Ullrich, K.A. Reed, C. Jablonowski, R.D. Nair and H.M. Tufo (2016) "Dynamical Core Model Intercomparison Project (DCMIP) tracer transport test results for CAM‐SE" Quart. J. Royal Meteor. Soc., Volume 142, Issue 697, pp. 1672–1684, doi: 10.1002/qj.2761.

  • (DOI) McCorquodale, P., P.A. Ullrich, H. Johansen and P. Colella. (2015) "An adaptive multiblock high-order finite-volume method for solving the shallow-water equations on the sphere" Comm. Appl. Math. Comp. Sci. 10-2, pp. 121-162, doi: 10.2140/camcos.2015.10.121.
  • (Link | DOI) Ullrich, P.A., K.A. Reed and C. Jablonowski (2015) "Analytical initial conditions and an analysis of baroclinic instability waves in f- and beta-plane 3D channel models." Quart. J. Roy. Meteor. Soc. Volume 141, Issue 693, pp. 2972–2988, doi: 10.1002/qj.2583.
  • (Link | DOI) Ullrich, P.A. and M.A. Taylor (2015) "Arbitrary-order conservative and consistent remapping and a theory of linear maps, part 1" Mon. Weather Rev., Volume 143, pp. 2419–2440, doi: 10.1175/MWR-D-14-00343.1.
  • (Link | DOI) Ullrich, P.A. and J.E. Guerra (2015) "Exploring the effects of a high-order vertical coordinate in a non-hydrostatic global model." Procedia Comput. Sci., Volume 51, pp. 2076-2085, doi: 10.1016/j.procs.2015.05.475.
  • (DOI) Ullrich, P.A. (2014) "A global finite-element shallow-water model supporting continuous and discontinuous elements" Geosci. Model Dev., Volume 7, pp. 5141-5182, doi: 10.5194/gmd-7-3017-2014.
  • (DOI) Guba, O., M.A. Taylor, P.A. Ullrich, J.R. Overfelt and M.N. Levy (2014) "The spectral element method on variable resolution grids: Evaluating grid sensitivity and resolution-aware numerical viscosity" Geosci. Model Dev., Volume 7, pp. 2803-2816, doi: 10.5194/gmd-7-2803-2014.
  • (Link | DOI) Zarzycki, C.M., M. Levy, C. Jablonowski, J.R. Overfelt, M.A. Taylor and P.A. Ullrich (2014) "Aquaplanet experiments using CAM's variable resolution dynamical core" J. Climate, Volume 27, pp. 5481-5503, doi:10.1175/JCLI-D-14-00004.1.
  • (Link | DOI) Ullrich, P.A., P.H. Lauritzen and C. Jablonowski (2014) "A high-order fully explicit flux-form semi-Lagrangian shallow-water model." Int. J. Numer. Meth. Fluids., Volume 75, Issue 2, pp. 103-133, DOI: 10.1002/fld.3887.
  • (DOI) Lauritzen, P. H., P.A. Ullrich, C. Jablonowski, P.A. Bosler, D. Calhoun, A.J. Conley, T. Enomoto, L. Dong, S. Dubey, O. Guba, A.B. Hansen, E. Kaas, J. Kent, J.-F. Lamarque, M.J. Prather, D. Reinert, V.V. Shashkin, W.C. Skamarock, B. Sørensen, M.A. Taylor and M.A. Tolstykh (2014): "A standard test case suite for two-dimensional linear transport on the sphere: results from a collection of state-of-the-art schemes." Geosci. Model Dev., Volume 7, pp. 105-145, doi:10.5194/gmd-7-105-2014.
  • (Link | DOI) Ullrich, P.A., T. Melvin, C. Jablonowski and A. Staniforth (2014) "A proposed baroclinic wave test case for deep- and shallow-atmosphere dynamical cores." Quart. J. Royal Meteor. Soc., Volume 140, Issue 682, pp. 1590-1602, doi: 10.1002/qj.2241.

  • (Link | DOI) Kent, J., P.A. Ullrich and C. Jablonowski (2014) "Dynamical Core Model Intercomparison Project: Tracer transport test cases" Quart. J. Roy. Meteor. Soc. Volume 140, Issue 681, pp. 1279–1293, doi: 10.1002/qj.2208.
  • (Link | DOI) Ullrich, P.A. (2014) "Understanding the treatment of waves in atmospheric models, Part I: The shortest resolved waves of the 1D linearized shallow water equations" Quart. J. Roy. Meteor. Soc., Volume 140, Issue 682, pp. 1426–1440, doi: 10.1002/qj.2226.
  • (Link | DOI) Ullrich, P.A. and M.R. Norman (2014) "The Flux-Form Semi-Lagrangian Spectral Element (FF-SLSE) method for tracer transport" Quart. J. Roy. Meteor. Soc., Volume 140, Issue 680, pp. 1069-1085, doi:10.1002/qj.2184.
  • (Link | DOI) Ullrich, P.A., P.H. Lauritzen and C. Jablonowski (2013) "Some considerations for high-order `incremental remap'-based transport schemes: edges, reconstructions and area integration." Int. J. Num. Methods Fluids, Volume 71, Issue 9, pp. 1131–1151, doi:10.1002/fld.3703.
  • (Link | DOI) Ullrich, P.A. and C. Jablonowski (2012) "MCore: A nonhydrostatic atmospheric dynamical core utilizing high-order finite-volume methods." J. Comp. Phys., Volume 231, Issue 15, pp. 5078–5108, doi: 10.1016/j.jcp.2012.04.024.
  • (Link | DOI) Ullrich, P.A. and C. Jablonowski (2011) "Operator-split Runge-Kutta-Rosenbrock methods for nonhydrostatic atmospheric models", Mon. Wea. Rev., Volume 140, Number 4, pp. 1257-1284, doi: 10.1175/MWR-D-10-05073.1.
  • (Link | DOI) Ullrich, P.A. and C. Jablonowski (2011) "An analysis of 1D finite-volume methods for geophysical problems on refined grids", J. Comp. Phys., Volume 230, Issue 3, pp. 706-725, doi: 10.1016/j.jcp.2010.10.014.
  • (Link | DOI) Ullrich, P.A., C. Jablonowski and B. van Leer (2010) "High-order finite-volume models for the shallow-water equations on the sphere", J. Comp. Phys., Vol. 229, Issue 17, pp. 6104-6134, doi: 10.1016/j.jcp.2010.04.044.
  • (Link | DOI) Lauritzen, P.H., R.D. Nair and P.A. Ullrich (2010) "A conservative semi-Lagrangian multi-tracer transport scheme (CSLAM) on the cubed-sphere grid", J. Comp. Phys. Vol. 229, Issue 5, pp. 1401--1424, doi: 10.1016/j.jcp.2009.10.036.
  • (Link | DOI) Ullrich, P.A., P.H. Lauritzen and C. Jablonowski (2009) "Geometrically Exact Conservative Remapping (GECoRe): Regular latitude-longitude and cubed-sphere grids", Mon. Wea. Rev. Vol. 137, No. 6, pp. 1721--1741.
Conference Papers and Published Abstracts
  • (Link) Ullrich, P.A., G. Jost, B.A. Lelbach and H. Johansen (2016) "Exascale-Ready Programming Models for Climate" Paper for Advancing X-cutting Ideas for Computational Climate Science.
  • (Link) Ullrich, P.A. (2015) "Recent Advances in the Development of Next-Generation Global Modeling Systems" Extended abstract for Comparative Climates of Terrestrial Planets II, NASA Ames, Moffett Field, California.
  • (Link) Ullrich, P.A. and J.E. Guerra (2015) "Exploring the Effects of a High-Order Vertical Coordinate in a Non-Hydrostatic Global Model." Conference paper presented at the International Conference on Computational Science: Numerical and Computational Developments to Advance Multiscale Earth System Models (MSESM), Reykjavik, Iceland, June 1-3, 2015.
Book Chapters
  • (Link) Lauritzen, P.H., P.A. Ullrich and R.D. Nair (2011) "Atmospheric transport schemes: Desirable properties and a semi-Lagrangian view on finite-volume discretizations." Chapter in the Springer book 'Numerical Techniques for Global Atmospheric Models.'
Limited Distribution
  • (Link) Ng, E.G., K. Evans, P. Caldwell, F.M. Hoffman, C. Jackson, K. Kleese Van Dam, R. Leung, D. Martin, G. Ostrouchov, R. Tuminaro, P.A. Ullrich, S.M. Wild, and S. Williams (2017) "Advancing Cross-Cutting Ideas for Computational Climate Science: Workshop Report", Eds. E.G. Ng and K. Evans.
  • (Link) Ullrich, P.A. and C.M. Zarzycki (2016) "Variable and adaptive resolution climate modeling with applications in subseasonal to seasonal extreme weather prediction." In: S2S Predictability of Extreme Weather, US CLIVAR Variations Newsletter Vol. 14, No. 4, Fall 2016, Eds. K. Pegion and S. Wang.
Contributions
  • (Link) Hanak, E., J. Mount, J. Lund, et al. (2016) "Climate Change and Water." In: California's Water, published by the Public Policy Institute of California Water Policy Center.
Theses
  • (Link) Ullrich, P.A. (2011) Atmospheric Modeling with High-Order Finite-Volume Methods, (PhD Thesis) University of Michigan.
  • (Link) Ullrich, P.A. (2007) Exact and Perturbed Friedmann-Lemaitre Cosmologies, (Master's Thesis) University of Waterloo.
Posters
  • (Link) Ullrich, P.A., J.E. Guerra, M. Pinheiro and J. Fong (2015) "Tempest: Tools for Addressing the Needs of Next-Generation Climate Models"
  • (Link) Ullrich, P.A., C. Jablonowski, J. Kent, K.A. Reed, M.A. Taylor, P.H. Lauritzen and R. Nair (2012) "Towards a Unified Test Case Suite for Global Atmospheric Models."
  • (Link) Ullrich, P.A. and C. Jablonowski (2011) "MCore: A High-Order Finite-Volume Dynamical Core"
  • (Link) Ullrich, P.A. and C. Jablonowski (2010) "High-order finite-volume methods for geophysical flow problems"
  • (Link) Ullrich, P.A., P.H. Lauritzen, C. Jablonowski (2008) "GECoRe: A Geometrically Exact Remapping Scheme on the Sphere"
  • (Link) Ullrich, P.A. (2008) "Parallel Load Balancing on a Cubed Sphere Grid"
Presentations
  • Ullrich, P.A. (2018) "California’s Drought of the Future (2042-2047)" Invited presentation at the Chinese Academy of Sciences Institute for Atmospheric Physics. August 1, 2018.
  • Ullrich, P.A. (2018) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Presentation to California Water Security Collaborative, Sacramento, California. May 25, 2018.
  • Ullrich, P.A. (2018) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Poster presentation to Community Earth System Model Annual Workshop, Boulder, Colorado. June 18-20, 2018.
  • Ullrich, P.A. (2018) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Invited presentation to Lawrence Livermore National Laboratory, Livermore, California. May 9, 2018.
  • Ullrich, P.A. (2018) "California’s Drought of the Future" Invited presentation at the Public Policy Institute of California "Dry Run for a Dry Future" meeting, San Francisco, California. April 27, 2018.
  • Ullrich, P.A. (2018) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Invited remote presentation to the United States Global Change Research Program (USGCRP). February 1, 2018.
  • Ullrich, P.A. (2017) "Attributing Climate Change:  The Fingerprints of Human Activity on Weather Extremes" Invited presentation to the Sierra Club Yolano Group, Davis, California. December 14, 2017.
  • Ullrich, P.A. and M. Wang (2017) "Wind in California: Marine Air Intrusion and Wind Power Generation" Remote presentation at the Regional and Global Climate Modeling Extremes group. November 9th, 2017.
  • Ullrich, P.A. (2017) "Extreme Weather Attribution" Invited presentation to the Yolo County Climate Compact, Davis, California. October 13, 2017.
  • Ullrich, P.A. and M. Wang (2017) "Advances in variable resolution climate and weather modeling" Presentation at the Meteorology and Climate - Modeling for Air Quality Conference, Davis, California. September 13, 2017.
  • Ullrich, P.A. et al. (2017) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Poster presentation at the 22nd Annual CESM workshop (CVCWG), Boulder, Colorado. June 19-22, 2017.
  • Rhoades, A., Ullrich, P.A., Johansen, H., Xu, Z., Zarzycki, C.M., and W.D. Collins (2017) "A Variable-Resolution CESM Case Study of the Comparative Importance of Model Resolution and Microphysics in a Mountainous Region" Presentation at the 22nd Annual CESM Workshop, Boulder, Colorado. June 19-22.
  • M. Wang, Ullrich, P.A., Millstein, D., and Collier, C. (2017) "The future of wind energy in California: Future projections in Variable-Resolution CESM" Presentation at the 22nd Annual CESM workshop (CVCWG), Boulder, Colorado. June 20, 2017.
  • Rhoades, A., Ullrich, P.A., Johansen, H., Xu, Z., Zarzycki, C.M., and W.D. Collins (2017) "Understanding western USA mountain hydroclimatology under present and future conditions using a next-generation variable-resolution global climate model" 2nd place poster presentation at the 2017 The Sierra Fund "Reclaiming the Sierra" Conference, Sacramento, California. May 8-9, 2017.
  • Ullrich, P.A. et al. (2017) "Hyperion: Understanding Hydroclimate Data with Use-Inspired Metrics" Invited presentation to the Water Utility Climate Alliance. April 24, 2017.
  • Ullrich, P.A. (2017) "Tempest:  Software Tools for Addressing the Needs of Next-Generation Climate Science" Invited presentation at Stanford University, Stanford, California. January 27, 2017.
  • Ullrich, P.A., C.M. Zarzycki, M. Wang and A. Rhoades (2016) "Climate model applications at the scale of NWP" Invited presentation at AGU Fall Meeting (IN13D-08), San Francisco, California. December 15, 2016.

  • M. Wang, Ullrich, P.A. (2016) "Marine Air Penetration: The Effect of Synoptic-scale Change on Regional Climate" Poster presentation at AGU Fall Meeting (A13E-0314), San Francisco, California. December 12, 2016.
  • Ullrich, P.A., C.M. Zarzycki, and R. Grotjahn (2016) "TempestExtremes: Automated Detection and Characterization of Extreme Weather" Presentation at AGU Fall Meeting (A44F-01), San Francisco, California. December 12, 2016.
  • Rhoades, A., Ullrich, P.A., Johansen, H., Xu, Z., Zarzycki, C.M., and W.D. Collins (2016) "Understanding California Mountain Wintertime Hydroclimate Trends using an Ensemble of High-Resolution Variable-Resolution CESM Simulations" Poster presentation at the AGU Fall Meeting (A21F-0132), San Francisco, California. December 12-16, 2016.
  • Ullrich, P.A. and C.M. Zarzycki (2016) "Variable and adaptive resolution climate modeling with applications in subseasonal to seasonal extreme weather prediction" Invited CLIVAR Variations Webinar. December 8, 2016.
  • Rhoades, A., Ullrich, P.A., Johansen, H., Xu, Z., Zarzycki, C.M., and W.D. Collins (2016) "Understanding western USA mountain hydroclimatology under present and future conditions using a next-generation variable-resolution global climate model" Poster presentation at the 2016 Mountain Climate (MtnClim) Conference, Leavenworth, Washington. October 17-21, 2016.
  • Ullrich, P.A. and J.E. Guerra (2016) "Tempest: A Framework for Experimental Numerical Methods" Presentation at SIAM Mathematics of Planet Earth, Philadelphia, Pennsylvania, October 2, 2016.
  • Ullrich, P.A., B. Lelbach, H. Johansen, P. Jones (2016) "New Programming Models for Climate: Bringing Climate Models to the Exascale" Invited presentation at Advancing X-cutting Ideas for Computational Climate Science (AXICCS), Washington, D.C. September 12, 2016.
  • Ullrich, P.A. (2016) "TempestExtremes: Indicators of change in the characteristics of extreme weather" Invited presentation at NASA Ames, Moffett Field, California. May 17, 2016.
  • Ullrich, P.A. (2016) "TempestExtremes: Indicators of change in the characteristics of extreme weather" Invited presentation at NASA Ames, Moffett Field, California. May 17, 2016.
  • Guerra, J.E. and P.A. Ullrich (2016) "Efficient Computation of Atmospheric Flows with Tempest: Validation of Next-Generation Climate and Weather Prediction Algorithms at Non-Hydrostatic Scales" Presentation at the European Geophyscial Union, Vienna, Austria. Abstract EGU2016-9160. April 19, 2016.

  • Rhoades, A., C. Zarzycki and P.A. Ullrich (2016) "Understanding hydroclimatic changes in western USA mountain ranges using the variable-resolution CESM (VR-CESM) multiscale method" Presentation at the Atmospheric Model Working Group Meeting, National Center for Atmospheric Research, Boulder, Colorado. February 9, 2016.
  • Ullrich, P.A. (2016) "Drought in California: A Climatological Look at Water in a Semi-Arid Landscape" Invited seminar at the California Water Policy Seminar Series on Drought (ECI 298), University of California Davis, Davis, California. January 11, 2016.
  • Ullrich, P.A., J.E. Guerra, M. Pinheiro and J. Fong (2015) "Tempest: Tools for Addressing the Needs of Next-Generation Climate Models" Poster presentation at the American Geophysical Union, San Francisco, California. Abstract NG23A-1778. December 14-18, 2015.
  • Rhoades, A., X. Huang, C. Zarzycki and P.A. Ullrich (2015) "Projecting 21st Century Snowpack Trends in the Western United States using Variable-Resolution CESM" Presentation at the American Geophysical Union, San Francisco, California. Abstract A53G-07. December 14-18, 2015.
  • Guerra, J.E. and P.A. Ullrich (2015) "Efficient Computation of Atmospheric Flows with Tempest: Development of Next-Generation Climate and Weather Prediction Algorithms at Non-Hydrostatic Scales" Poster presentation at the American Geophysical Union, San Francisco, California. Abstract NG23A-1779. December 14-18, 2015.
  • Huang, X., A. Rhoades, P.A. Ullrich and C. Zarzycki (2015) "High-resolution regional climate model evaluation using variable-resolution CESM over California" Poster presentation at the American Geophysical Union, San Francisco, California. Abstract A51J-0198. December 14-18, 2015.
  • Rhoades, A., C.M. Zarzycki and P.A. Ullrich (2015) "Understanding 21st Century Hydroclimatic Trends in Western USA Mountain Ranges using Variable-Resolution CESM" Presentation at the Lawrence Berkeley National Laboratory Climate Brown Bag, Berkeley, California. December 7, 2015.
  • Ullrich, P.A. (2015) "Working with Finite Elements: Addressing a Paradigm Shift in Geosciences Modeling" Invited talk at the Naval Research Laboratory, Monterey, California. December 3, 2015.
  • Ullrich, P.A. (2015) "Tempest: Tools for Addressing the Needs of Next-Generation Climate Models" Presentation at the Workshop on Partial Differential Equations on the Sphere, Seoul, South Korea. October 19 - 22, 2015.
  • Ullrich, P.A. (2015) "Reaching High Spatial Resolutions with Regionally Refined Global Climate Models" Presentation at the Meteorology And Climate - Modeling for Air Quality Conference, Sacramento, California. September 16 - 18, 2015.
  • Ullrich, P.A. (2015) "Recent Advances in the Development of Next-Generation Global Modeling Systems" Invited presentation at Comparative Climates of Terrestrial Planets II, NASA Ames, Moffett Field, California. September 8 - 11, 2015.

  • Rhoades, A., X. Huang, P.A. Ullrich and C. Zarzycki (2015) "Projecting 21st Century Sierra Nevada Snowpack Using a Next-Generation Variable Resolution Model" Poster presentation at the California Climate Change Symposium 2015, Sacramento, California. August 24 - 25, 2015.
  • Ullrich, P.A. (2015) "Towards Robust Multi-Scale Global Atmospheric Models" Presentation at SIAM Geosciences 2015, Palo Alto, California. June 29 - July 2, 2015.
  • Ullrich, P.A. and J.E. Guerra (2015) "Exploring the Effects of a High-Order Vertical Coordinate in a Non-Hydrostatic Global Model" Conference paper presented at the International Conference on Computational Science: Numerical and Computational Developments to Advance Multiscale Earth System Models (MSESM), Reykjavik, Iceland, June 1-3, 2015.
  • Guerra, J.E. and P.A. Ullrich (2015) "Arbitrary-Order Staggered Finite-Element Methods for Geophysical Flows" Presentation at SIAM Computer Science and Engineering (CS&E) 2015, Salt Lake City, Utah. March 18, 2015.
  • Ullrich, P.A. and J.E. Guerra (2015) "Tempest: Efficient Computation of Atmospheric Flows Using High-Order Local Discretization Methods" Presentation at SIAM Computer Science and Engineering (CS&E) 2015, Salt Lake City, Utah. March 18, 2015.
  • Ullrich, P.A., A. Rhoades, X. Huang and C. Zarzycki (2015) "An Assessment of Variable-Resolution Climate Modeling in CAM" Presentation at the Community Earth System Model Atmospheric Model Working Group Meeting 2015, National Center for Atmospheric Research, Boulder, Colorado. February 19, 2014.
  • Rhoades, A., P. Ullrich, C. Zarzycki, M. Levy, M. Taylor (2014) "Variable-Resolution Ensemble Climatology Modeling of Sierra Nevada Snowpack within the Community Earth System Model (CESM)" Presentation at the American Geophysical Union Fall Meeting 2014, San Francisco, California. December 19, 2014.
  • Guerra, J.E. and P.A. Ullrich (2014) "Tempest: Mesoscale test case suite results and the effect of order-of-accuracy on pressure gradient force errors" Poster presentation at the American Geophysical Union Fall Meeting 2014, San Francisco, California. December 16, 2014.
  • Ullrich, P.A. and J.E. Guerra (2014) "Tempest – Efficient Computation of Atmospheric Flows Using High-Order Local Discretization Methods" Poster presentation at the American Geophysical Union Fall Meeting 2014, San Francisco, California. December 16, 2014.
  • Ferguson, J., C. Jablonowski, H. Johansen, R. English, P. McCorquodale, P. Colella, J. Benedict, W. Collins, J. Johnson and P. Ullrich (2014) "Assessing Grid Refinement Strategies in the Chombo Adaptive Mesh Refinement Model" Presentation at the American Geophysical Union Fall Meeting 2014, San Francisco, California. December 15, 2014.

  • Ullrich, P.A., J.E. Guerra, A. Rhoades, X. Huang and C.M. Zarzycki (2014) "Towards Robust Multi-Scale Global Atmospheric Models" Invited presentation at the University of Kansas, Lawrence, Kansas. December 1, 2014.
  • Ullrich, P.A., A. Rhoades, X. Huang and C.M. Zarzycki (2014) "Bringing Global Climate Models to the Regional Scale" Invited presentation at the University of California Irvine, Irvine, California. November 12, 2014.
  • Ullrich, P.A. and J.E. Guerra (2014) "Seeking Robust Solutions to the Pressing Problems in Global Atmospheric Modeling" Invited presentation at the University of Washington, Seattle, Washington. September 25, 2014.
  • Guerra, J.E. nad P.A. Ullrich (2014) "HARDCore: Efficient Computation of Atmospheric Flows with Arbitrary Order Local Discretization Methods" Presentation at SIAM 2014, Chicago, Illinois. July 7, 2014.
  • Ullrich, P.A. and J.E. Guerra (2014) "Efficient Computation of Atmospheric Flows using High-Order Local Discretization Methods" Presentation at ICOSAHOM 2014, Salt Lake City, Utah. June 25, 2014.
  • Ullrich, P.A. and J.E. Guerra (2014) "Arbitrary-Order Hybrid Finite-Element Methods for Geophysical Flows" Presentation at Partial Differential Equations on the Sphere 2014, Boulder, Colorado. April 10, 2014.
  • Ullrich, P.A. (2014) "Towards Robust Multi-Scale Atmospheric Models" Invited presentation at the UC Davis Graduate Group in Applied Mathematics Symposium, Davis, California. January 25, 2014.
  • Rhoades, A., P.A. Ullrich and C.M. Zarzycki (2013) "Variable Resolution Modeling of California Snowpack within the Community Earth System Model (CESM)" Presentation at the American Geophysical Union Fall Meeting 2013, San Francisco, California. December 12, 2013.
  • Rhoades, A., P.A. Ullrich, C.M. Zarzycki, M. Levy and M.A. Taylor (2013) "Variable Resolution Modeling of Sierra Nevada Snowpack" Poster presentation at the American Geophysical Union Fall Meeting 2013, San Francisco, California. December 11, 2013.
  • Ullrich, P.A. and J. Guerra (2013) "Arbitrary-Order Hybrid Finite-Element Methods for Geophysical Flows" Presentation at the American Geophysical Union Fall Meeting 2013, San Francisco, California. December 11, 2013.

  • Ullrich, P.A. (2013) "Towards Robust Multi-Scale Atmospheric Models" Invited presentation at the High-Performance Computational Science with Structured Meshes and Particles (HPCS-SMP), Lawrence Berkeley National Laboratory, Berkeley, California. October 14, 2013.
  • Ullrich, P.A. (2013) "Recent Advances in Climate Modeling on the Regional and Global Scale" Invited presentation at the California Air Resources Board, Sacramento, California. September 27, 2013.
  • Ullrich, P.A. (2013) "Towards the Next Generation of Numerical Methods for Geophysical Simulation" Invited presentation at the Naval Postgraduate School, Monterey, California. August 29, 2013.
  • Ullrich, P.A. (2013) "Towards the Next Generation of Numerical Methods for Geophysical Simulation" Invited presentation at the Korean Institute for Atmospheric Prediction Systems, Seoul, South Korea. August 21, 2013.
  • Ullrich, P.A. (2013) "High-Order Geometrically Exact Conservative Remapping" Invited presentation at the Korean Institute for Atmospheric Prediction Systems, Seoul, South Korea. August 20, 2013.
  • Ullrich, P.A. (2013) "A Better Understanding of the Earth System Through Advances in CFD" Invited presentation at Four Decades of CFD: Looking Back and Moving Forward, San Diego, California. June 22-23, 2013.
  • Ullrich, P.A and A. Rhoades. (2013) "Variable Resolution Modeling of California Snowpack within the Community Earth System Model (CESM)" and "SQuadGen: A New Tool for Generation of Variable Resolution Quadrilateral Meshes." Poster presentation at the 2013 CESM Workshop, Breckenridge, Colorado. June 17-20, 2013.
  • Ullrich, P.A. (2013) "Recent Advances in the Simulation of Global Atmospheric Dynamics." Invited presentation at Lawrence Berkeley National Laboratory, Berkeley, California. April 29, 2013.
  • Ullrich, P.A. (2013) "Conservative Semi-Lagrangian Methods on the Cubed-Sphere." Presentation at the Society for Industrial and Applied Mathematics (SIAM) Computer Science and Engineering Meeting, Boston, Massachusetts. February 27, 2013.
  • Ullrich, P.A. (2013) "Understanding the treatment of waves in atmospheric models: The shortest resolved waves of the linear wave equation." Invited presentation at the University of California Berkeley, Berkeley, California. February 20, 2013.

  • Ullrich, P.A., C. Jablonowski, J. Kent, K.A. Reed, M.A. Taylor, P.H. Lauritzen and R. Nair (2012) "Towards a Unified Test Case Suite for Global Atmospheric Models." Poster presentation at the 2012 Fall Meeting, American Geophysical Union, San Francisco, CA, December 3-7, 2012.
  • Ullrich, P. A. (2012) "Recent Advances in Climate Modeling on the Regional and Global Scale." Presentation at the California Air Resources Board, Sacramento, California. October 3, 2012.
  • Ullrich, P. A. (2012) "MCore: New Approaches to Numerical Modeling of the Atmosphere." Presentation at the 2012 PDEs on the Sphere Meeting, Cambridge, U.K. September 27, 2012.
  • Ullrich, P. A. (2012) "New Approaches to Numerical Modeling of the Regional-Global Climate." Invited presentation at the University of Michgian AIM Seminar, Ann Arbor, Michigan. March 23, 2012.
  • Ullrich, P. A. (2012) "New Approaches to Numerical Modeling of Regional-Global Climate." Invited presentation at the University of Illinois, Champaign, Illinois. March 7, 2012.
  • Ullrich, P. A. (2012) "New Approaches to Numerical Modeling of the Atmosphere." Invited presentation at the University of California Los Angeles, Los Angeles, California. February 15, 2012.
  • Ullrich, P. A. (2012) "New Approaches to Numerical Modeling of the Atmosphere." Invited presentation at the University of California Davis, Davis, California. January 17, 2012.
  • Ullrich, P. A. (2012) "New Approaches to Numerical Modeling of the Atmosphere." Invited presentation at the Lawrence Berkeley National Laboratory, Berkeley, California. January 13, 2012.
  • Ullrich, P. A. and C. Jablonowski (2011) "MCore: Advances in high-order modeling of the global atmosphere." Presentation at American Geophysical Union Fall Meeting 2011, San Francisco, CA, USA, December 5-9, 2011.
  • Ullrich, P. A. (2011) "New Approaches to Numerical Modeling of the Atmosphere." Invited presentation at the University of Waterloo, Waterloo, Ontario, Canada. November 25, 2011.

  • Jablonowski, C., P. A. Ullrich and K. A. Reed (2011) "High-Order Methods and Nonhydrostatic Designs on Quasi-Uniform and Variable-Resolution Grids: Tackling the Numerical Challenges for Future-Generation GCMs." Invited presentation at the Global-to-Regional Climate Simulation Workshop, Santa Fe, NM, USA, August 3-5, 2011.
  • Jablonowski, C. and P. A. Ullrich (2011) "A High-Order Finite-Volume Scheme for the Dynamical Core of Weather and Climate Models." Invited presentation at the Scientic Discovery through Advanced Computing Program (SciDAC) Conference, Denver, CO, USA, July 10-14, 2011.
  • Ullrich, P.A. and Jablonowski, C. (2011) "MCore: A High-Order Finite-Volume Dynamical Core." Presentation at the 16th Annual CESM Workshop, Breckenridge, CO, USA, June 20-23, 2011.
  • Ullrich, P.A. (2011) "High-Order Finite-Volume Methods for Atmospheric Transport." Presentation at the Workshop on Transport Schemes on the Sphere, Boulder, CO, USA, March 31, 2011.
  • Ullrich, P.A. (2011) "Towards the Next Generation of Climate Models." Presentation at the SIAM Conference of the Geosciences, Long Beach, CA, USA, March 24, 2011.
  • Jablonowski, C. and Ullrich, P.A. (2011) "A High-Order Finite-Volume Technique for Nonhydrostatic Dynamic Cores on (Adaptive) Cubed-Sphere Grids." Presentation at the NCAS meeting, Boulder, CO, USA, March 7-9 2011.
  • Ullrich, P.A. (2011) "Towards the Next Generation of Climate Models." Presentation at the University of Michigan Seminar Series, Ann Arbor, MI, USA, January 10, 2011.
  • Ullrich, P.A. (2010) "High-order finite-volume methods for geophysical flow problems" Presentation at American Geophysical Union Fall Meeting 2010, San Francisco, CA, USA, December 13-17, 2010.
  • Ullrich, P.A. (2010) "High-order finite-volume schemes for simulating atmospheric flows" Poster presentation at the Engineering Graduate Symposium, Ann Arbor, MI, USA, November 12, 2010.
  • Ullrich, P.A. (2010) "A look at high-order finite-volume schemes for simulating atmospheric flows" Presentation at the Workshop on Solutions to Partial Differential Equations on the Sphere, Potsdam, Germany, August 22-27, 2010.

  • Ullrich, P.A. (2010) "High-order finite-volume methods for geophysical flow problems" Poster presentation at the NSF Institute for Pure and Applied Mathematics (IPAM), Workshop II: Numerical Hierarchies for Climate Modeling, Los Angeles, CA, USA, April 16, 2010.
  • Jablonowski, C.J. and Ullrich, P.A. (2010) "An Analysis of Finite-Volume schemes: High-order Methods and Grid Reflections on Adaptive Grids" Invited presentation at the NSF Institute for Pure and Applied Mathematics (IPAM), Workshop II: Numerical Hierarchies for Climate Modeling, Los Angeles, CA, USA, April 16, 2010.
  • Ullrich, P.A. (2010) "High-order finite-volume methods for geophysical flow problems" Poster presentation at the Michigan Geophysical Union, Ann Arbor, MI, USA, March 26, 2010.
  • Ullrich, P.A. (2009) "Riemann-Solver Based Shallow-Water FV Models on the Sphere" Poster presentation at the Engineering Graduate Symposium, Ann Arbor, MI, USA, November 13, 2009.
  • Ullrich, P.A. (2009) "Riemann-Solver Based Shallow-Water FV Models on the Sphere" Invited Talk at Field's Workshop on Dynamics in Environmental and Geophysical Flows, Waterloo, Ontario, Canada, July 27-29, 2009.
  • Ullrich, P.A. (2009) "GECoRe: A Geometrically Exact Remapping Scheme on the Sphere" Presentation at the Workshop on Solutions to Partial Differential Equations on the Sphere, Santa Fe, USA, April 27-30, 2009.
  • Ullrich, P.A. (2009) "GECoRe: A Geometrically Exact Remapping Scheme on the Sphere" Poster presentation at the Michigan Geophysical Union 2009, Ann Arbor, MI, USA, March 20, 2009.
  • Ullrich, P.A., P.H. Lauritzen, C. Jablonowski (2008) "GECoRe: A Geometrically Exact Remapping Scheme on the Sphere" Poster presentation at the American Geophysical Union Fall Meeting 2008, San Francisco, CA, USA, December 15-19, 2008.
  • Ullrich, P.A. (2008) "GECoRe: A Geometrically Exact Remapping Scheme on the Sphere" Poster presentation at the Engineering Graduate Symposium, Ann Arbor, MI, USA, November 7, 2008.
  • Ullrich, P.A. (2008) "Parallel Load Balancing on a Cubed Sphere Grid" Poster presentation at the Michigan Geophysical Union 2008, Ann Arbor, MI, USA, March 16, 2008.