THE ESTIMATION OF THE LONG-RANGE TRANSPORT OF AIR POLLUTANTS IN CHINA——PART I: TRAJECTORY ANALYSIS

The trajectories of air parcels through the ten big cities of China(Beijing,Xi'an,etc.)have been computed by using the data of wind fields at 1500 m elevation.The data based on these trajectories and end points of trajectories have been used to calculate the long-range transport of pollutants emitted from these cities and to estimate the geographic position of distant sources affecting these cities.An advantage of the statistical trajectory model is eXpected that the error of the individual trajectories tends to be averaged out in the long run.