A CASE STUDY ON SANDSTORM

The favourable synoptic situation and climate background for a sandstorm process,which occurred in the period 9-16 April 1988,have been studied through analyzing weather maps,meteorological elements,satellite cloud pictures and sandstorm trajectories.The sand dust origin area,the directions and the paths of sand dust transport,and the extent the sand dust reached are also investigated.The results of measurments and analysis indicate that the concentration of sand dust particles is 10 times greater than the normal.It is also shown that the elements in the sand dust are lithophylic and come from natural source through the chemical composition analysis of the sand dust,so that the sand dust has not been polluted by human activities.