Scientific Assessment of Ozone Depletion: 2018 - Executive Summary

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dc.contributor.organizationScience Division
dc.date.accessioned2018-11-22T08:27:50Z
dc.date.available2018-11-22T08:27:50Z
dc.date.issued2018
dc.descriptionThis document summarizes the 2018 scientific assessment of ozone layer status and policy-relevant findings under the Montreal Protocol. It reports continued declines in controlled ozone-depleting substances and early recovery signals: the Antarctic ozone hole remains annual but shows signs of shrinking, upper-stratospheric ozone has increased by about 1–3% per decade since 2000, and near-global total column ozone shows no significant trend over 1997–2016, staying roughly 2% below 1964–1980 averages. An unexpected post-2012 rise in CFC-11 emissions is identified, and previously unrecognized sources of carbon tetrachloride are better quantified. The Kigali Amendment’s phasedown is projected to reduce HFC-related warming from roughly 0.3–0.5°C to less than 0.1°C by 2100. Models project ozone returning to 1980 levels in the Northern Hemisphere mid-latitudes in the 2030s, Southern Hemisphere mid-latitudes around mid-century, and Antarctic spring in the 2060s.en
dc.formatpdf
dc.identifier.urihttps://wedocs.unep.org/handle/20.500.11822/26858
dc.languageEnglish
dc.page.number68 pages
dc.rights.accessLevelPublic
dc.subjectozone-depleting substance
dc.subjecthydrofluorocarbon
dc.subjectstratosphere
dc.subjectozone layer
dc.subjectclimate
dc.subjectOzone
dc.subject.sdgSDG 13 - Climate Action
dc.subject.themeclimate
dc.titleScientific Assessment of Ozone Depletion: 2018 - Executive Summaryen
dc.typePolicy brief
wd.identifier.sdgiohttp://purl.unep.org/sdg/SDGIO_00000047

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