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    Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires

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    Geophysical Research Letters - 2022 - Strahan - Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the.pdf (636.4Kb)
    Links to Files
    https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL098290
    Permanent Link
    https://doi.org/10.1029/2022GL098290
    http://hdl.handle.net/11603/25277
    Collections
    • UMBC Faculty Collection
    • UMBC GESTAR II
    Metadata
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    Author/Creator
    Strahan, Susan
    Smale, Dan
    Solomon, Susan
    Taha, Ghassan
    Damon, Megan R.
    Steenrod, Stephen D.
    Jones, Nicholas
    Liley, Ben
    Querel, Richard
    Robinson, John
    Author/Creator ORCID
    https://orcid.org/0000-0002-7511-4577
    Date
    2022-07-18
    Type of Work
    9 pages
    Text
    journal articles
    Citation of Original Publication
    Strahan, 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/10.1029/2022GL098290
    Rights
    ©2018. American Geophysical Union. All Rights Reserved
    Access to this item will begin on 01/18/2023
    Abstract
    The 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.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3021


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.