Chlorine activation and enhanced ozone depletion induced by wildfire aerosol

Susan Solomon (), Kane Stone (), Pengfei Yu, D. M. Murphy, Doug Kinnison, A. R. Ravishankara and Peidong Wang
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Susan Solomon: Massachusetts Institute of Technology
Kane Stone: Massachusetts Institute of Technology
Pengfei Yu: Jinan University
D. M. Murphy: NOAA Chemical Sciences Laboratory
Doug Kinnison: National Center for Atmospheric Research
A. R. Ravishankara: Colorado State University
Peidong Wang: Massachusetts Institute of Technology

Nature, 2023, vol. 615, issue 7951, 259-264

Abstract: Abstract Remarkable perturbations in the stratospheric abundances of chlorine species and ozone were observed over Southern Hemisphere mid-latitudes following the 2020 Australian wildfires1,2. These changes in atmospheric chemical composition suggest that wildfire aerosols affect stratospheric chlorine and ozone depletion chemistry. Here we propose that wildfire aerosol containing a mixture of oxidized organics and sulfate3–7 increases hydrochloric acid solubility8–11 and associated heterogeneous reaction rates, activating reactive chlorine species and enhancing ozone loss rates at relatively warm stratospheric temperatures. We test our hypothesis by comparing atmospheric observations to model simulations that include the proposed mechanism. Modelled changes in 2020 hydrochloric acid, chlorine nitrate and hypochlorous acid abundances are in good agreement with observations1,2. Our results indicate that wildfire aerosol chemistry, although not accounting for the record duration of the 2020 Antarctic ozone hole, does yield an increase in its area and a 3–5% depletion of southern mid-latitude total column ozone. These findings increase concern2,12,13 that more frequent and intense wildfires could delay ozone recovery in a warming world.

Date: 2023
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DOI: 10.1038/s41586-022-05683-0

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