FEATURES OF OZONE DISTRIBUTION OBTAINED FROM NIMBUS-7 TOMS DATA AROUND TYPHOONS

The pattern of total ozone distribution around typhoons is studied in reference with NIMBUS-7 TOMS data and typhoon trek charts made by Japan Meteorological Agency. Out of 174 samples of typhoons in the area bounded by 10N/45N and 105E/160E latitude and longitude lines during the period 1980 through 1989, characterisitic patterns are recognized in 62 samples. The pattern is roughly classified into two types, i. e. the one with higher concentration in a central part while the other with higher concentration in the shape of spiral bands converging into the center. It is found that the latter appears when a typhoon is coupled with a trough of a large scale pressure system in the westerly zone. It is also found that the duration of the specific pattern of ozone distribution is comparatively short.