Effective Temperature of Atmospheric Ozone

The temperature of atmospheric ozone influences the amount of UV radiation reaching the surface. The absorption of radiation by ozone in the UV is temperature dependent and generally increases with temperature. The effective temperature of atmospheric ozone (i.e., average temperature of column ozone weighted by ozone concentration) can vary by up to 20°C depending on latitude and season. Over this temperature range, ozone absorption can change by up to 10% at some wavelengths.

It is possible to measure the effective temperature of ozone since the spectrum of the temperature dependence has features that can be used as a dependent vector in a DOAS analysis. The methods used to measure effective ozone temperatures and the multiyear records of the effective ozone temperatures at Toronto are reported by Kerr (2002) and Kerr and Davis (2007).

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