Relationship of the Antarctic Ozone Hole with India and Other Regions in the Northern and Southern Hemispheres as determined from Dobson Data

Abstract

A study of the monthly values of total ozone in the Indian region indicated long-term trends generally less than 5% in 13 years (1977-1989) and solar cycle effects also less 5% (solar maximum to solar minimum). The quasibiennial oscillation (QBO) was at times as large as 10%. Simultaneously, with the Antarctic ozone depletion of -45% in October 1987, the Indian region showed 10-15% depletions in November and December 1987. Depletions were observed at other latitudes and longitudes also. However, the percentage depletions in low latitudes seem to be smaller than those at middle latitudes in both Southern and Northern Hemispheres. The changes observed in the Northern Hemisphere at high latitudes are most probably not related to the Antarctic ozone depletion but are, instead, caused by winter planetary waves. However, low latitudes, even in the Northern Hemisphere may have some effect of the Antarctic ozone hole.