Atmospheric Dynamics Modeling Group




The National Center for Atmospheric Research Advanced Study Program Summer Colloquium on

Numerical Techniques for Global Atmospheric Models

June 1-13, 2008, Boulder, Colorado, U.S.A.

The Primary Organizers are

Peter H. Lauritzen (NCAR), Christiane Jablonowski (University of Michigan), Mark Taylor (Sandia National Laboratories) and Ramachandran D. Nair (NCAR)

Additional support provided by NASA and DOE.

Participating Models

ICON (ICOsahedral Non-hydrostatic General Circulation Model), MPI.

(GEF (Global Eta Framework), University of Maryland).

OLAM (ocean-land-atmosphere model), Duke University.

GEOS (Goddard Earth Observing System), NOAA-GFDL/NASA

BQ_Core (B-grid Quadratic Upstream), GISS, NASA.

MITgcm (Massachusetts Institute of Technology General Circulation Model), MIT.

CSUgcm (Colorado State University General Circulation Model), CSU.

GME, German Weather Service.

CAM (Community Atmosphere Model, version 3.5), NCAR.

HOMME (High Order Method Modeling Environment), NCAR/Sandia.


Presentations

1 Introduction, Peter Hjort Lauritzen, CGD, NCAR.

2 Earth System Curator, Sylvia Murphy, Julien Chastang, Luca Cinquini, NCAR.

3 Use of Supercomputers, Mike Page, CISL, NCAR.

4 Basic Dynamics I, John Thuburn, School of Engineering, Computer Science and Mathematics, University of Exeter, UK.

5 Basic Dynamics II, John Thuburn, School of Engineering, Computer Science and Mathematics, University of Exeter, UK.

6 The Challenges of Massively Parallel Computing, Rich Loft, CISL, NCAR.

7 Idealized Test Cases for Dynamical Core Experiments, Christiane Jablonowski, Department of Atmospheric, Oceanic and Space Sciences, University of Michigan.

8 Horizontal Discretizations, John Thuburn, School of Engineering, Computer Science and Mathematics, University of Exeter, UK.

9 Finite-Volume Methods in Meteorology - a semi-Lagrangian view, Peter Hjort Lauritzen, CGD, NCAR.

10 The use of modeling frameworks to facilitate interoperability, Cecelia DeLuca (ESMF, NCAR), Bill Putman (GSFC, NASA) and David Neckels (ESMF, NCAR).

11 Vertical Discretizations, John Thuburn, School of Engineering, Computer Science and Mathematics, University of Exeter, UK.

12 Adaptive Grids for Atmospheric General Circulation Models, Christiane Jablonowski, Department of Atmospheric, Oceanic and Space Sciences, University of Michigan.

13 Tiling the sphere with quadrilaterals: Cubed-sphere grids and their challenges for numerical methods, Mark Taylor, Sandia National Laboratories.

14 Conservation, John Thuburn, School of Engineering, Computer Science and Mathematics, University of Exeter, UK.

15 Numerical Noise: The Pros and Cons of Filters, Diffusion and Damping Mechanisms, Christiane Jablonowski, Department of Atmospheric, Oceanic and Space Sciences, University of Michigan.

16 A Little Bit More on Waves and Turbulence, Joe Tribbia, CGD, NCAR.

17 Emerging Methods For Conservation Laws, Ram Nair, IMAGe, NCAR.

18 Different Forms of the Governing Equations for Atmospheric Motions, Dale Durran, Department of Atmospheric Sciences, University of Washington.

19 Various forms of F=ma: Building a discrete model of force balance that does what we want it to do, Todd Ringler, Theoretical Division, LANL.

20 Time Differencing: Basic Techniques, Dale Durran, Department of Atmospheric Sciences, Universisty of Washington.

21 Dynamical Cores: Design and the Designer, Richard B. Rood, University of Michigan.

22 Triangles, Squares or Hexagons?, Todd Ringler, Theoretical Division, LANL.

23 Time Differencing: Physically Insignificant Fast Waves, Dale Durran, Department of Atmospheric Sciences, University of Washington.

24 Kinetic Energy Spectra and Model Filters, Bill Skamarock, MMM, NCAR.

25 Introduction to Voronoi Diagrams and Delaunay Triangulations, Todd Ringler, Theoretical Division, LANL.

26 Transport and a Goldilocks Search, Todd Ringler, Theoretical Division, LANL.

27 Spectral Transform Method: Eulerian and Semi-Lagrangian, David Williamson, CGD, NCAR.

28 Geodesic Grids and Hybrid Vertical Coordinates, David A. Randall, Department of Atmospheric Science, CSU.

29 Postdoctoral Fellowship Opportunities at the UCAR and NCAR in Boulder Colorado, Maura Hagan, ASP, NCAR.


Earth System Curator

Support was provided by the Earth System Curator (ESC) project working together with the Earth System Grid (ESG). This team provided long term archive of the 1.1 TB of data and collected metadata on each model component and simulation. Together, the metadata and data will significantly enhance the post colloquium component intercomparison. The long term goal of the ESC project is to facilitate the use of model metadata into scientific workflows and model intercomparison projects.

View metadata and idealized test case data for the models that participated in the colloquium: ESG-CET.


Test Case Document

Idealized test cases for the dynamical cores of Atmospheric General Circulation Models: A proposal for the NCAR ASP 2008 summer colloquium (download/view)


High-resolution reference solutions for the baroclinic wave test

These solutions and the uncertainty of the reference solutions are used in the publication:

Jablonowski, C. and D. L. Williamson (2006): A Baroclinic Instability Test Case for Atmospheric Model Dynamical Cores, Quart. J. Roy. Met. Soc., Vol. 132, October 2006 Part C, No. 621C, 2943-2975

Download the uncertainty of the reference solutions:

l1, l2 and linf uncertainties for the surface pressure field

Download the netcdf files for the surface pressure field (daily snapshots for 30 days):

CAM EUL dynamical core at the spectral resolution T170 (with Gaussian weights)

CAM EUL dynamical core at the spectral resolution T340 (with Gaussian weights)

CAM SLD dynamical core at the spectral resolution T170 (with Gaussian weights)

CAM SLD dynamical core at the spectral resolution T340 (with Gaussian weights)

CAM FV dynamical core at the lat x lon resolution 361x576

CAM FV dynamical core at the lat x lon resolution 721x1152

GME dynamical core at the resolution ni128, interpolated to a 361x576 grid

GME dynamical core at the resolution ni256, interpolated to a 721x1152 grid


Posters and Publications

Poster presented at the 13th Annual CCSM Workshop, The Village at Breckenridge, Breckenridge, CO, 17-19 June, 2008.

Poster presented at the American Geophysical Union Fall Meeting, San Francisco, CA, 15-19 December, 2008.

Jablonowski, C., P. H. Lauritzen, R. D. Nair and M. Taylor (2008),"Idealized test cases for the dynamical cores of Atmospheric General Circulation Models: A proposal for the NCAR ASP 2008 summer colloquium", Technical Report (download the manuscript in pdf format 8.5MB)

Lauritzen, P. H., C. Jablonowski, M. A. Taylor and R. D. Nair (Eds.) (2011), Numerical Techniques for Global Atmospheric Models, Lecture Notes in Computational Science and Engineering, Springer, Vol. 80, 556 pp.

Lauritzen, P. H, C. Jablonowski, M. A. Taylor and R. D. Nair (2010), Rotated versions of the Jablonowski steady-state and baroclinic wave test cases: A dynamical core intercomparison, J. Adv. Model. Earth Syst., Vol. 2, Art. #15, 34 pp., Article Spotlight December 2009, available online (6.7 MB)


Photos

Group photo, Organizers

Latest update: July 24th, 2014