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Introduction

Chemical transport model is a powerful tool for studying the mechanisms of 3-D distributions of chemical species in the atmosphere. Several three-dimensional chemical transport models have been developed, and the developments are being continued for better understanding of global distributions and variations of many kinds of chemical constituents as well as the ozone depletion in the Antarctic and in the Arctic (e.g. Brassuer et al., 1997; Lefevre et al., 1998; Chipperfield, 1999). In order to develop a fully coupled, chemical-radiative-dynamical interactive model for prediction of future ozone layer, chemistry-radiation-coupled scheme must be incorporated into a GCM. The final goal of our study is to develop a 3-D chemical model that can be used both as a Chemical Transport Model constrained by meteorological data, and as a chemical-radiative-dynamical fully interactive GCM. Such model will enable us to check the chemical scheme and the advection scheme of the model by comparisons with observations. At the same time, a reliable prediction of future ozone in the chemical-radiative-dynamical interactive model will be possible. In this paper, development of a new CTM is described, then the calculated distributions and variations of several chemical species in 1997, when ILAS O₃, N₂O, and HNO₃ data were available, are shown and compared with the observations.