THE UPPER AIR COLD TROUGH OVER CHINA DURING HIGH INDEX CIRCULATION OVER FAR EAST

During High-Index Circulation over Far East,A series of cold trough in the upper troughs may pass over Tibet plateau from the west and move to Eastern China.But in the lower troposphere these troughs are very obscured over the plateau.In this paper the structure and characteristics of these troughs are discussed,and a spnvptic example of Feb.10-12 1956 is given.