### Friday, July 17

## MS71

Running Large-Scale Environmental Models on High-Speed Computers

2:00 PM-4:00 PM

*Room: Sidney Smith 1073*

The atmosphere is the main medium, and perhaps the only medium, in which pollutants can quickly be transported over long distances. A very substantial part of the pollution of the environment is due to transport of pollutants in the atmosphere and/or chemical transformations (including here photochemical reactions) under the transport. High pollution levels are dangerous for many ecosystems and may lead to damages of the health of the population in large regions. Therefore they should be studied carefully by large mathematical models in which all relevant physical and chemical processes are adequately described. However, such a mathematical model leads to huge computational problems. There are two ways to overcome the difficulties. The first way is to make some simplifying, but non-physical, assumptions in order to reduce the size of the models, but one cannot, in general, guarantee the reliability of the results. The second way is to keep an adequate description of the physics and the chemistry, but try to solve the problem by selecting fast numerical methods and by adapting the models to run efficiently on the available computer architectures. The speakers in this minisymposium will discuss the second way. They will present numerical methods that can efficiently be used on parallel architectures.

**Organizer: Zahari Zlatev**

*National Environmental Research Institute, Roskilde, Denmark*
**2:00 Parallel Numerical Solution of Partial Differential Equations with Mixed Derivatives**
*Nikolaos M. Missirlis* and L. A. Boukas, University of Athens, Greece
**2:30 Parallel Computation of Air Pollution Models**
- Claus Bendtsen, Technical University of Denmark, Lyngby, Denmark
**3:00 Parallel Numerical Simulation of Air Pollution in Southern Italy**
- Guido Barone, University of Naples "Federico II," Italy;
*Pasqua D'Ambra*, Center for Research on Parallel Computing and Supercomputers of the National Research Council (CPS-CNR), Naples, Italy; Daniela di Serafino, Second University of Naples and CPS-CNR, Italy; Giulio Giunta, Naval University of Naples and CPS-CNR, Italy; Almerico Murli, University of Naples - "Federico II" and CPS-CNR, Italy; and Angelo Riccio, University of Naples - "Federico II", Italy
**3:30 Long Term Ozone Simulation and HPCN**
- Joke Blom, Center for Mathematics and Computer Science (CWI), Amsterdam, The Netherlands

LMH Created: 3/19/98; MMD Updated: 7/2/98