You are here:
INITIAL APPL;ICATION OF THE ADAPTIVE GRID AIR POLLUTION MODEL
Citation:
Odman, M. T., M. N. Khan, R K. Srivastava*, AND D. S. McRae. INITIAL APPL;ICATION OF THE ADAPTIVE GRID AIR POLLUTION MODEL. Presented at 25th NATO/CCMS Int. Tech. Conf., Air Pollution Modeling and Its Application, Louvain-la-Neuve, Belgium, 10/15-19/2001.
Description:
The paper discusses an adaptive-grid algorithm used in air pollution models. The algorithm reduces errors related to insufficient grid resolution by automatically refining the grid scales in regions of high interest. Meanwhile the grid scales are coarsened in other parts of the domain that are of lesser interest. This ensures a near-optimal use of available computational resources at all times during the simulation. The movement of the grid is controlled by a weight function formed as a linear combination of errors in various pollutant species. The user defines which species should be included in the weight-function calculation. After a brief description of the adaptive-grid model, the paper discusses its performance in an initial application to an ozone episode that occurred in the Tennessee Valley during July 1995. A mesoscale model at 4-km resolution over the region provided the meteorological inputs. The estimated ozone levels are compared to the observations from the Aerometric Information Retrieval System (AIRS) network for verification of the model. The same episode was also simulated by a fixed-grid model whose results and run-time statistics are compared to the adaptive-grid model for an initial evaluation of accuracy and efficiency. Finally, the paper outlines how the model can ber improved.