Trends evolution of ozone between 1980 and 2000 midlatitudes over the Southern Hemisphere: Decadal differences in trends

FABIO E. MALANCA; PABLO O. CANZIANI; GUSTAVO A. ARGÜELLO

JOURNAL OF GEOPHYSICAL RESEARCH

AGU

Año: 2005 vol. 110 p. 1 - 1

0148-0227

he variability of atmospheric midlatitudinal ozone between 1980 and 2000 over the Southern Hemisphere is discussed. The distribution of ozone and ozone change during the seasonal cycle is dicussed using Total Ozone Mapping Spectrometer Nimbus and Earth Probe data binned at 72 (30ºlongitude by 5º latitude) bins, between 60º and 30ºS. Rather than using a standard trend approach, the annual mean time series for each bin were fitted with a cubic polynomial. The results show that in the zonal mean sense there is a sizable, latitude-dependent slowdown of the ozone loss form the early 1990s onward, but when individual bins are considered, significant longitudinal patterns of ozone change appear, with both positive (enhancement) and negative (depletion) changes in total ozone. Thus regional evolution remains important as an indicator both of chemical depletion evolution and the relation with climate. Such longitudinal behavior is limited in the subtropics and grows toward the subpolar edge of