Journal
SCIENCE
Volume 353, Issue 6296, Pages 269-274Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aae0061
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Funding
- NSF Frontiers in Earth System Dynamics grant [OCE-1338814]
- NSF Atmospheric Chemistry grant [AGS-1539972]
- University of Leeds
- NCAR visiting scientist grant
- Natural Environment Research Council [NE/N006038/1]
- NSF
- Office of Science of the U.S. Department of Energy
- Natural Environment Research Council [NE/N006038/1, ncas10003] Funding Source: researchfish
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1539972] Funding Source: National Science Foundation
- NERC [ncas10003, NE/N006038/1] Funding Source: UKRI
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Industrial chlorofluorocarbons that cause ozone depletion have been phased out under the Montreal Protocol. A chemically driven increase in polar ozone (or healing) is expected in response to this historic agreement. Observations and model calculations together indicate that healing of the Antarctic ozone layer has now begun to occur during the month of September. Fingerprints of September healing since 2000 include (i) increases in ozone column amounts, (ii) changes in the vertical profile of ozone concentration, and (iii) decreases in the areal extent of the ozone hole. Along with chemistry, dynamical and temperature changes have contributed to the healing but could represent feedbacks to chemistry. Volcanic eruptions have episodically interfered with healing, particularly during 2015, when a record October ozone hole occurred after the Calbuco eruption.
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