Monitoring atmospheric composition & climate
Ozone Layer & Ultra-Violet Radiation

ozone layer and uvStratospheric ozone, also known as the ozone layer, is a key element of the Earth's atmosphere protecting exposed life forms on Earth from potentially harmful ultra-violet (UV) radiation that is emitted by the Sun. Over the last few decades, emissions of human-made chemicals, such as CFCs, have had a detrimental effect on the amount of ozone in the stratosphere. This is most clearly observed over the Antarctic, where the chemical destruction of ozone is known as the 'ozone hole'. The Montreal Protocol, signed in 1989, has been instrumental in phasing out the production and use of CFCs resulting in a slowed-down depletion of the ozone layer.

MACC-II provides services that maintain and update the historical record of stratospheric ozone using available satellite observations from 1979 until the present with a special focus on the period 2003 - 2012. MACC-II furthermore provides forecasts of stratospheric ozone concentrations up to 8 days ahead, and provides 5-day forecasts of UV radiation taking into account the effect of ozone, clouds, and  aerosol particles.

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User cases

WMO_ozone_bulletin_small.pngThe MACC-II analayses and forecasts are a recurring feature of the Antarctic Ozone Bulletins of the World Meteorological Organization (WMO). The Secretariat of the WMO issues these bulletins containing information on the state of the ozone layer in the Antarctic at roughly two week intervals from August to November. The bulletins are based on data provided by WMO Members which operate ozone monitoring stations in the southern hemisphere and satellites to observe ozone globally. The MACC-II forecasts of the ozone hole are also used by some of the ozone sonde stations to time the release of their balloon sondes, which is especially useful for stations that lie on the edge of th ozone depleted area.