Ozone Hole Meteorology: 2011 Temperature
The depth and area of the Antarctic ozone hole are governed by the temperature of the stratosphere and the amount of sunlight reaching the south polar region. Temperatures that are cold enough can form polar stratospheric clouds (PSCs). PSCs are an important component in the destruction of ozone molecules. PSCs can be formed when temperatures fall below a given threshold for each type of PSC. The formation temperature is dependent on concentrations of nitric acid and water vapor, and the potential temperature of the air. PSCs can be formed from sulfate aerosols, nitric acid trihydrate (NAT), or ice.
Comparison to all years
The following figures show the daily progression through the ozone hole season, comparing the current year to the climatology of all other years.
-- click on a link for a PDF figure --