Total ozone mass calculation to assess the global ozone behavior

José Luis Pinedo Vega, Carlos Ríos Martínez, Mario Molina Almaraz, J. Ignacio Dávila Rangel, Fernando Mireles García

Abstract

This work presents an assessment of the global and hemispheric total ozone mass and its interannual variations, using the total number of daily satellite measurements from the Total Ozone Mapping Spectrometer (TOMS) version 8 and Ozone Monitoring Instrument (OMI) level 3. The mean total ozone mass was 3.1283 ± 0.1337 × 1012 kg from November 1978 to November 1979, and 2.9979 ± 0.0917 × 1012 kg from November 2004 to November 2005. The difference (1.3033 ± 0.3221 × 1011 kg) represents a 4.2 ± 0.3% decrease in 26 yrs (1.615 ± 0.113% per decade), around 3% corresponding to the Northern Hemisphere and 5% corresponding to the Southern Hemisphere; 1.2 and 2.0% per decade, respectively. Differences in total ozone mass trends between Northern and Southern hemispheres indicate a change in geographic ozone distribution in the Southern Hemisphere. A linear fit between November 1978 and November 1991 shows a global ozone decrease of 4.72 × 109 kg per year, representing a loss of 1.5% per decade. Additionally, we found a net interannual variation of 16% of the total quantity existing during the equinoxes, when the maximum annual total ozone mass is reached.

Keywords

Global and hemispherical ozone trends; total ozone mass; interannual variation; TOMS data; OMI data

Full Text:

PDF