Trends in Atmospheric Ozone 1957-2015

Abstract

A general linear model with dummy coded time intervals is proposed for the detection of short term seasonal variations and deseasonalized long term trends in atmospheric total column ozone from 1957 to 2015. Data from ground stations located in the northern mid-latitudes, the tropics, and Antarctica show seasonal cycles and long term declining trends in total ozone that differ according to latitude. The long term decline is weakest in the tropics and strongest in Antarctica. Some evidence of stabilization and recovery of ozone levels is found.

Keywords: ozone, ozone depletion, dobson spectrophotometer, ozone ground stations, total column ozone, genera linear model, dummy coding, trend analysis, deseasonalized trends, antarctic ozone hole, hydrofluorocarbons, greenhouse gases, climate change, stratosphere, troposphere, atmospheric chemistry