Relationship Between the Eastern Tibetan Plateau Rainfall and Subtropical High Shift in Summer

Based on the routine rainfall data on the Tibetan Plateau and NCEP/NCAR reanalysis data, the relationship between the eastern Tibetan Plateau rainfall and the southward/northward shift of West Pacific ubtropical high in summer of 1993/1994 is studied. The results show that: the West Pacific subtropil high is abnormally located to more southern latitude and the high ridge is mainly the quasi-biweekly uthward/northward oscillation in its processes of northward shift from May to August in 1993; but it is abormally located to more northern latitude and the high ridge is obviously 30-60-day southward/northward cillation in its processes of northward shift from May to August in 1994. At the same time, it is found hat the changes of the eastern Tibetan Plateau rainfall active/break have the similar characteristics of the high ridge southward/northward oscillation. Therefore, the southward/northward shift of the West Pacific ubtropical high in summer may be related to the changes of eastern Tibetan Plateau rainfall active/break.