English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The springtime depletion of tropospheric ozone in the Arctic is known to becaused by active halogen photochemistry resulting from halogen atomprecursors emitted from snow, ice, or aerosol surfaces. The role of brominein driving ozone depletion events (ODEs) has been generally accepted, butmuch less is known about the role of chlorine radicals in ozone depletionchemistry. While the potential impact of iodine in the High Arctic is moreuncertain, there have been indications of active iodine chemistry throughobserved enhancements in filterable iodide, probable detection oftropospheric IO, and recently, observation of snowpack photochemicalproduction of I2. Despite decades of research, significant uncertaintyremains regarding the chemical mechanisms associated with thebromine-catalyzed depletion of ozone, as well as the complex interactionsthat occur in the polar boundary layer due to halogen chemistry. Toinvestigate this, we developed a zero-dimensional photochemical model,constrained with measurements from the 2009 OASIS field campaign in Barrow,Alaska. We simulated a 7-day period during late March that included a fullozone depletion event lasting 3 days and subsequent ozone recovery to studythe interactions of halogen radicals under these different conditions. Inaddition, the effects of iodine added to our Base Model were investigated.While bromine atoms were primarily responsible for ODEs, chlorine and iodinewere found to enhance the depletion rates and iodine was found to be moreefficient per atom at depleting ozone than Br. The interaction betweenchlorine and bromine is complex, as the presence of chlorine can increase therecycling and production of Br atoms, while also increasing reactive brominesinks under certain conditions. Chlorine chemistry was also found to havesignificant impacts on both HO2 and RO2, with organic compoundsserving as the primary reaction partner for Cl atoms. The results of thiswork highlight the need for future studies on the production mechanisms ofBr2 and Cl2, as well as on the potential impact of iodine in theHigh Arctic

Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska