Western North Pacific tropical cyclones and ENSO in NIED CGCM

ABSTRACT

The influence of El Niño/Southern Oscillation (ENSO) on tropical cyclone (TC) activity in the western North Pacific (WNP) is investigated using a high-resolution atmosphere-ocean Coupled General Circulation Model (CGCM) developed by the National Research Institute for Earth Sciencie and Disaster Prevention. The CGCM simulation indicates the model TC activity associating with the ENSO as follows; (1)the frecuency of model TC in the WNP during the ENSO cold phase is slightly higher than during the ENSO warm phase (2)the genesis loction of model TC shifts eastward during the ENSO warm phase, (3)model TC tends to migrate westward during the ENSO warm phase and northward during the ENSO cold phase. These results are intimately related to variations in atmospheric circulaton and SST during the ENSO. Similar influences are also confirmed in the relationship between actual TC activity and actual ENSO. (AU)