Preliminary analysis on the structure and intensity of concentric double-eye typhoons

The concentric double-eye structure and intensity of typhoons are investigated and discussed by using reconnaissance aircraft data, radar echo photos and satellite images. 76 double-eye typhoons were observed during 1949-1983. The results indicate that the concentric double-eye structure, generally appearing in intense typhoons over the northwestern Pacific Ocean, is closely related to typhoon's intensity. This kind of structure has apparent characteristics in geographical and seasonal distributions. An idealized structure model for the concentric double-eye typhoons is proposed.