Using Trajectory Methods and Dispersion Models to Discern the Variation of Sulfur Dioxide Air Concentrations in China

 

Peng Yan and Roland R. Draxler

 

Unpublished manuscript, November 12, 1996

 

Abstract - Back trajectory analyses were used to determine the source regions for measured SO2 concentrations at Waliguan, Lin'an, and Longfengshan, P.R. China.  In general the trajectory methods were able to distinguish the large scale flow but proved ineffective in resolving some of the smaller variations within particular clusters.  Additional meteorological information along the trajectory is required.  A Lagrangian transport, dispersion, and deposition model in conjunction with a gridded emission inventory of SO2 was able to reproduce the magnitude and fluctuations at all the sites except Longfengshan, where near zero measured concentrations were attributed to local effects.  The good performance of a dispersion model where concentrations are the linear sum of contributions from each emission area suggests that this would be the most effective and accurate method for source attribution studies.

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