Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires

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dc.contributor.authorStrahan, Susan
dc.contributor.authorSmale, Dan
dc.contributor.authorSolomon, Susan
dc.contributor.authorTaha, Ghassan
dc.contributor.authorDamon, Megan R.
dc.contributor.authorSteenrod, Stephen D.
dc.contributor.authorJones, Nicholas
dc.contributor.authorLiley, Ben
dc.contributor.authorQuerel, Richard
dc.contributor.authorRobinson, John
dc.date.accessioned2022-08-02T21:11:55Z
dc.date.available2022-08-02T21:11:55Z
dc.date.issued2022-07-18
dc.description.abstractThe inorganic chlorine (Cly) and odd nitrogen (NOy) chemical families influence stratospheric O3. In January 2020 Australian wildfires injected record-breaking amounts of smoke into the southern stratosphere. Within 1–2 months ground-based and satellite observations showed Cly and NOy were repartitioned. By May, lower stratospheric HCl columns declined by ∼30% and ClONO2 columns increased by 40%–50%. The Cly perturbations began and ended near the equinoxes, increased poleward, and peaked at the winter solstice. NO2 decreased from February to April, consistent with sulfate aerosol reactions, but returned to typical values by June - months before the Cly recovery. Transport tracers show that dynamics not chemistry explains most of the observed O3 decrease after April, with no significant transport earlier. Simulations assuming wildfire smoke behaves identically to sulfate aerosols couldn't reproduce observed Cly changes, suggesting they have different composition and chemistry. This undermines our ability to predict ozone in a changing climate.en_US
dc.description.sponsorshipWe thank the ACE Science Team for use of their data products. SES thanks the NASA ACMA and NASA MAP programs for research and model support. SES acknowledges support from NASA Grant 80NSSC19K1005. Measurements at Lauder and Arrival Heights are core-funded by NIWA through New Zealand's Ministry of Business, Innovation and Employment Strategic Science Investment Fund. SS gratefully acknowledges support from NSF-1848863 and 1906719. GT acknowledges support from NASA Grant 80NSSC18K0847. NJ wishes to acknowledge funding from the Australian Research Council that has supported the FTIR program at the University of Wollongong, and recognize colleagues at the Centre for Atmospheric Chemistry for their past and ongoing contributions. BL thanks his collaborators Osamu Uchino (NIES), Isamu Morino (NIES), Tetsu Sakai (MRI), and Tomohiro Nagai (MRI).en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL098290en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ydyx-ci63
dc.identifier.citationStrahan, S. E., Smale, D., Solomon, S., Taha, G., Damon, M. R., Steenrod, S. D., et al. (2022). Unexpected repartitioning of stratospheric inorganic chlorine after the 2020 Australian wildfires. Geophysical Research Letters, 49, e2022GL098290. https://doi.org/10.1029/2022GL098290en_US
dc.identifier.urihttps://doi.org/10.1029/2022GL098290
dc.identifier.urihttp://hdl.handle.net/11603/25277
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rights©2018. American Geophysical Union. All Rights Reserveden_US
dc.rightsAccess to this item will begin on 01/18/2023
dc.titleUnexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfiresen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7511-4577en_US

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