TRANSPORT CHARACTERISTICS IN THE TROPOSPHERE AND LOWER STRATOSPHERE OF THE SOUTHERN HEMISPHERE

Trajectory analyses of air parcels for the Southern Hemisphere spring are performed with observed data during the period from September to December of 1982. It is found that the diffusivity at 60°S and poleward in the lower stractosphere is low during early spring. The diffusion in December is nearly homogeneous and turbulent in the lower stratosphere. Net advective motion is estimated following H. KIDA (J. Meteorol. Soc. Jpn., 61,171,1983). In September at 50-100mb, the net advective motion is upward in the polar region and downward at 50-60°S. This meridional cell is quite similar to the one proposed by K. K. TUNG et al. (Nature, 322,311,1986) in both shape and magnitude. A sudden increase of ozone was observed at Syowa Station (69°S) on October 28,1982. It is inferred from the backward trajectory analysis that this sudden ozone increase was primarily caused by a strong downward motion