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Why Do Antarctic Ozone Recovery Trends Vary?
Susan E Strahan1,2, Anne R Douglass1, Megan R Damon1,3
1Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA.
Journal of Geophysical Research. Atmospheres : JGR
|February 20, 2020
Summary
Scientists identified a metric to track Antarctic ozone recovery, showing ozone-depleting substance (ODS) decline is linked to ozone layer healing. This metric accurately captures the expected trend in ozone levels over four decades.
Area of Science:
- Atmospheric Chemistry and Physics
- Climate Science
- Ozone Layer Research
Background:
- The Antarctic ozone layer depletion is primarily driven by ozone-depleting substances (ODSs).
- Accurate metrics are needed to quantify ozone recovery attributed to the reduction of ODSs.
Purpose of the Study:
- To identify a reliable metric for tracking Antarctic ozone trends linked to declining ozone-depleting substances (ODSs).
- To assess the sensitivity of ozone recovery to the timing of measurements within the Antarctic vortex.
Main Methods:
- Utilized satellite ozone records and Global Modeling Initiative chemistry transport model (GMI CTM) simulations.
- Integrated Modern Era Retrospective for Research and Analysis 2 (MERRA-2) meteorology for model validation.
- Compared model simulations with varying ODS levels against fixed ODS levels to isolate recovery trends.
Main Results:
- The GMI CTM Baseline simulation accurately reproduced observed Antarctic September ozone variations over four decades.
- Vortex-averaged column ozone showed highest sensitivity to ODS changes between September 1st and 20th.
- Ozone recovery was most pronounced inside the vortex near its edge; certain metrics like the O3 mass deficit showed bias.
Conclusions:
- A specific metric, sensitive to ODS decline, accurately reflects Antarctic ozone recovery trends.
- Measurement timing is crucial, with early September data providing a clearer signal of ODS-driven recovery.
- Area weighting and adjusted Dobson unit thresholds improve the accuracy of ozone mass deficit metrics for trend analysis.
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