Effects of TCs on Summertime Subtropical ISOs and Higher-frequency Wave Patterns over the East Asian Monsoon Region

The global JRA re-analysis data and a TC-removed technique was applied to study the impact of TCs on the ISO propagating over the western North Pacific (WNP). The TC-removed data exhibited a westward shift from the area between Taiwan and Japan to the northern South China Sea. The monsoon trough weakened accordingly after TCs were removed. Furthermore, the interaction between the ISO and higher-frequency wave patterns also exhibited weaker patterns after TC removal. However, the activity over the South China Sea remained considerable intensity because fewer TCs formed and propagated to this area. Thus the ISO and higher-frequency wave patterns retained considerable intensity over the South China Sea.