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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 7, 1417, doi:10.1029/2002GL016739, 2003

Seasonal persistence of midlatitude total ozone anomalies

Vitali E. Fioletov

Meteorological Service of Canada, Toronto, Ontario, Canada


Theodore G. Shepherd

Department of Physics, University of Toronto, Toronto, Ontario, Canada


Abstract

Temporal autocorrelations of monthly mean total ozone anomalies over the 35–60°S and 35–60°N latitude bands reveal that anomalies established in the wintertime midlatitude ozone buildup persist (with photochemical decay) until the end of the following autumn, and then are rapidly erased once the next winter's buildup begins. The photochemical decay rate is found to be identical between the two hemispheres. High predictability of ozone through late summer exists based on the late-spring values. In the northern hemisphere, extending the 1979–2001 springtime ozone trend to other months through regression based on the seasonal persistence of anomalies captures the seasonality of the ozone trends remarkably well. In the southern hemisphere, the springtime trend only accounts for part of the summertime trends. There is a strong correlation between the ozone anomalies in northern hemisphere spring and those in the subsequent southern hemisphere spring, but not the converse.

Published 15 April 2003.

Index Terms: 0340 Atmospheric Composition and Structure: Middle atmosphere—composition and chemistry; 0341 Atmospheric Composition and Structure: Middle atmosphere—constituent transport and chemistry (3334).

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Citation: Fioletov, V. E., and T. G. Shepherd (2003), Seasonal persistence of midlatitude total ozone anomalies, Geophys. Res. Lett., 30(7), 1417, doi:10.1029/2002GL016739.