Is the Ozone Layer on the Mend? Highlights from the most recent WMO/UNEP Ozone Assessment

• Localización: Boletín - Organización Meteorológica Mundial, ISSN 1014-9627, Vol. 64, Nº. 1, 2015 (Ejemplar dedicado a: Climate knowledge for climate action), págs. 52-55
• Idioma: inglés
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• Resumen

  • The 2014 Ozone Assessment provides the latest update of the current state of the ozone layer and makes predictions on when the ozone layer will return to 1980 values. In the northern middle latitudes (35-60°N), total ozone is now about 3.5% less than it was in the period from 1964-1980. At southern middle latitudes (35-60°S), it is about 6% less. The larger depletion in the Southern Hemisphere is linked to the Antarctic ozone hole. Following the decline in total ozone during the 1980s and 1990s, the situation has stabilized since 2000. Hidden under the inter-annual variability, there are indications of a small increase in recent years, but it is not statistically significant. At around 40km altitude there are signs of a more clear recent increase in ozone, but the statistical significance of this increase is subject to further studies in the science community.