Wednesday, March 24

Numerical Algorithms in Air Quality Modeling

10:00 AM-12:00 PM
Room: Executive Salon 2

Numerical air quality modeling primarily deals with the approximate solution of so-called photochemical dispersion models. These models are used to enhance the understanding of the chemical composition of the atmosphere, in particular with regard to the relation between anthropogenic emissions and the resulting distributions of primary and secondary polluting species. At the heart of such models, lie systems of time-dependent, three-space dimensional PDEs describing advective transport, turbulent diffusive transport, many (photo)chemical reactions, emissions and depositions. Models are extremely CPU intensive. Each single species introduces a PDE and modern models easily contain 100 species or more. Numerical issues involve advection schemes, stiff ODE solvers, operator splitting, adaptive grids and of course high-performance computing and parallelism. The speakers in this session will present recent research results, focusing on algorithmic issues.

Organizer: Jan Verwer
Center for Mathematics and Computer Science (CWI), Amsterdam, The Netherlands

10:00-10:25 Numerical Time Integration for Air Pollution Models
Jan Verwer, Organizer
10:30-10:55 Operator Splitting in the Stiff Case
Bruno Sportisse, CERMICS, Ecole Nationale des Ponts et Chaussées, Marne la Vallee, France
11:00-11:25 Long Term Ozone Simulation
Joke Blom, Center for Mathematics and Computer Science (CWI), Amsterdam, The Netherlands; and Jan G. Verwer, Organizer
11:30-11:55 Source Splitting Versus Operator Splitting in Air Chemistry Models
Oswald Knoth and Ralf Wolke, Institute for Troposperic Research, Leipzig, Germany

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MMD, 11/19/98