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1. Introduction

Tropospheric ozone is not only a principal green house effect gas, but also the most important chemical s. Understanding of present global distribution and budget of tropospheric ozone is very important for future prediction of atmospheric environment and climate. Stratospheric ozone is one of possible source of tropospheric ozone. Contribution of stratospheric ozone to the global budget of tropospheric ozone is, however, still uncertain. In this study, stratospheric effect on the distribution and budget of tropospheric ozone is analyzed using a 3D chemical model.