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Comparison of model and ground observations finds snowpack and blowing snow both contribute to Arctic tropospheric reactive bromine

Abstract : Reactive halogens play a prominent role in the atmospheric chemistry of the Arctic during springtime. Field measurements and models studies suggest that halogens are emitted to the atmosphere from snowpack and reactions on wind-blown snow. The relative importance of snowpack and blowing snow sources is still debated, both at local scales and regionally throughout the Arctic. To understand implications of these halogen sources on a pan-Arctic scale, we simulate Arctic reactive bromine chemistry in the atmospheric chemical transport model GEOS-Chem. Two mechanisms are included: 1) a blowing snow sea salt aerosol formation mechanism and 2) a snowpack mechanism assuming uniform molecular bromine production from all snow surfaces. We compare simulations including neither mechanism, each mechanism individually, and both mechanisms to examine conditions where one process may dominate or the mechanisms may interact. We compare the models using these mechanisms to observations of bromine monoxide (BrO) derived from multiple-axis differential optical absorption spectroscopy (MAX-DOAS) instruments on O-Buoy platforms on the sea ice and at a coastal site in Utqiaġvik, Alaska during spring 2015. Model estimations of hourly and monthly average BrO are improved by assuming a constant yield of 0.1% molecular bromine from all snowpack surfaces on ozone deposition. The blowing snow mechanism increases BrO by providing more surface area for reactive
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https://hal-insu.archives-ouvertes.fr/insu-03578658
Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Thursday, February 17, 2022 - 2:04:19 PM
Last modification on : Saturday, February 19, 2022 - 3:31:34 AM
Long-term archiving on: : Wednesday, May 18, 2022 - 6:51:26 PM

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William Swanson, Chris Holmes, William Simpson, Kaitlyn Confer, Louis Marelle, et al.. Comparison of model and ground observations finds snowpack and blowing snow both contribute to Arctic tropospheric reactive bromine. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2022, pp.(Discussions). ⟨10.5194/acp-2022-44⟩. ⟨insu-03578658⟩

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