Physics – Space Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ysc..conf...36g&link_type=abstract
12th Young Scientists' Conference on Astronomy and Space Physics, held in Kyiv, Ukraine, April 19-23, 2005, Eds.: Simon, A.; Gol
Physics
Space Physics
Scientific paper
During last decades the changes of total ozone content (TOC) have been fixed on all Earth's surface. Its general decrease takes place especially in high latitudes of South Hemisphere. Therefore, TOC difference between middle and high latitudes has been increasing. In the Antarctic region large seasonal oscillations of ozone content are observed in the spring. Ozone hole develops starting with August. The long-scales wave processes have a determinant effect on the ozone dynamics. The planetary waves propagate from troposphere into stratosphere in a form of stationary (more exactly, quasi-stationary) and traveling disturbances. In this work the dynamical processes effect on ozone content in Antarctic region is studied. TOMS satellite measurements for August-December during 25 years (1979-2004) are analysed. Quasi-stationary component of planetary waves is considered. In latitude band of 60-70 S, the TOC quasi-stationary zonal distribution has the maximum amplitude in spring. It is characterized by one longitudinal maximum and one minimum. Thus, the domination of stationary wave of zonal wave number 1 takes place. Averaged amplitudes and phases of the zonal numbers 1-3 were determined. The averaged distributions show that a quasi-stationary wave maximum is stable during last 25 years whereas a minimum is moving from west to east. The increased values of TOC are observed at longitudes 150-180 ? (south of Australia) and decreased ones exist in the Atlantic longitudinal sector. Some latitudinal distinctions exist in the considered latitudinal interval. The maximum's and minimum's positions are shifted in the east direction approaching to the pole. For instance, a difference between the positions of quasi-stationary wave maximum at the latitudes 65 S and 70 S is equal about 20 degrees. This extremum behaviour can be explained by superposition of quasi-stationary wave 1 and 2. The change of these two component parameters causes a long-term displacement of quasi-stationary wave minimum.
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