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The Antarctic ozone hole during 2017

Citation

Klekociuk, AR and Tully, MB and Krummel, PB and Evtushevsky, O and Kravchenko, V and Henderson, SI and Alexander, SP and Querel, RR and Nichol, S and Smale, D and Milinevsky, GP and Grytsai, A and Fraser, PJ and Xiangdong, Z and Gies, HP and Schofield, R and Shanklin, JD, The Antarctic ozone hole during 2017, Journal of Southern Hemisphere Earth Systems Science pp. 1-30. ISSN 2206-5865 (In Press) [Refereed Article]


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Copyright 2019 The Authors

Official URL: http://www.bom.gov.au/jshess/index.shtml

DOI: doi:10.22499/3.6902.001

Abstract

We review the 2017 Antarctic ozone hole, making use of various meteorological reanalyses, and in-situ, satellite and ground-based measurements of ozone and related trace gases, and ground-based measurements of ultraviolet radiation. The 2017 ozone hole was associated with relatively high ozone concentrations over the Antarctic region compared to other years, and our analysis ranks it in the smallest 25% of observed ozone holes in terms of size. The severity of stratospheric ozone loss was comparable with that which occurred in 2002 (when the stratospheric vortex exhibited an unprecedented major warming) and most years prior to 1989 (which were early in the development of the ozone hole). Disturbances to the polar vortex in August and September that were associated with intervals of anomalous planetary wave activity resulted in significant erosion of the polar vortex and the mitigation of the overall level of ozone depletion. The enhanced wave activity was favoured by below-average westerly winds at high southern latitudes during winter, and the prevailing easterly phase of the Quasi- Biennial Oscillation (QBO). Using proxy information on the chemical makeup of the polar vortex based on analysis of nitrous oxide and the likely influence of the QBO, we suggest that the concentration of inorganic chlorine, which plays a key role in ozone loss, was likely similar to 2014 and 2016, when the ozone hole was larger than in 2017. Overall, we find that the overall severity of Antarctic ozone loss in 2017 was largely dictated by the timing of the disturbances to the polar vortex rather than interannual variability in the level of inorganic chlorine.

Item Details

Item Type:Refereed Article
Keywords:ozone, stratosphere
Research Division:Chemical Sciences
Research Group:Other Chemical Sciences
Research Field:Environmental Chemistry (incl. Atmospheric Chemistry)
Objective Division:Environment
Objective Group:Atmosphere and Weather
Objective Field:Atmospheric Processes and Dynamics
UTAS Author:Klekociuk, AR (Dr Andrew Klekociuk)
UTAS Author:Alexander, SP (Dr Simon Alexander)
ID Code:134273
Year Published:In Press
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2019-08-06
Last Modified:2019-09-16
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