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Advanced Earth System Models: Simulating Climate Dynamics and Processes

This document discusses the development of advanced electronic computing systems for climate modeling at the University of Copenhagen. Professor Eigil Kaas explores the capabilities of the Cray XT5 supercomputer in conducting 3D dynamic Earth system models. These models simulate essential processes such as the ocean and land-surface carbon cycle, interactive aerosol and gas-phase chemistry, and the dynamics of ice sheets and biology. Key equations, including thermodynamics and Navier-Stokes, are utilized to understand atmospheric phenomena and validate climate models against observed data.

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Advanced Earth System Models: Simulating Climate Dynamics and Processes

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  1. Climate and Earth Systems Models using Scientific Computing Eigil Kaas Professor in Meteorology and Climate Dynamics Niels Bohr Institute University of Copenhagen.

  2. The Development of Electronic Computers In front of the ENIAC, April 4, 1950: H.Wexler, J. von Neumann, M. H. Frankel, J. Namias, J. C. Freeman, R. Fjortoft, F. W. Reichelderfer, and J. G. Charney.

  3. The new DMI-computer: Cray XT5 (in a bigger configuration).

  4. 3-dimensional dynamic Earth system models • Applications: • Simulating basic processes and changes in the entire Earth system. • Ocean and land-surface carbon cycle • Interactive aerosol module • Interactive chemistry (mostly gas phase) • Ice sheets • Biology • …

  5. The first equation of thermodynamics Continuity equation for dry air Governing dynamical equations for the atmosphere Navier-Stokes equation (Unit mass version of “Newton's second law) expressed in the accelerated coordinate system of the Earth Continuity equation for various tracers including water vapour Equation of state for ideal gases (i.e. no particle density included in ρ).

  6. Hybrid sigma theta

  7. Example of validation of atmospherec models: Precipitation

  8. SST Errors: ECHAM5/MPI-OM Systematic errors in sea surface temperature (SST)

  9. Hadley Centre simulations with HADGEM1 in ENSEMBLES Observed (black line) anthropogenic + natural forcings (red lines), anthropogenic forcings only (blue lines), anthroponegic (- effects of black carbon) + natural forcings (green line).

  10. Circulation changes II topography control MOD SSTs CLIMAP SSTs MOD+topo CLIMAP+topo

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