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https://doi.org/10.5194/acp-2020-170
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-170
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  22 Apr 2020

22 Apr 2020

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A revised version of this preprint is currently under review for the journal ACP.

Snow heterogeneous reactivity of bromide with ozone lost during snow metamorphism

Jacinta Edebeli1,2, Jürg C. Trachsel3, Sven E. Avak1, Markus Ammann1, Martin Schneebeli3, Anja Eichler1,4, and Thorsten Bartels-Rausch1 Jacinta Edebeli et al.
  • 1Laboratory of Environmental Chemistry, Paul Scherrer Institut, Villigen PSI, Switzerland
  • 2Swiss Federal Institute of Technology, ETH Zurich, Zürich, Switzerland
  • 3WSL-Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland
  • 4Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland

Abstract. Earth's snow cover is very dynamic on diurnal time scales. The changes to the snow structure during this metamorphism have wide ranging impacts such as on avalanche formation and on the capacity of surface snow to exchange trace gases with the atmosphere. Here, we investigate the influence of dry metamorphism, which involves fluxes of water vapor, on the chemical reactivity of bromide in the snow. For this, the heterogeneous reactive loss of ozone at a concentration of 5–6 x 1012 molecules cm-3 is investigated in artificial, shock-frozen snow samples doped with 6.2 μM sodium bromide and with varying metamorphism history. The oxidation of bromide in snow is one reaction initiating polar bromine releases and ozone depletions. We find that the heterogeneous reactivity of bromide is completely absent from the air-ice interface in snow after 12 days of temperature gradient metamorphism and suggest that burial of non-volatile bromide salts occurs when the snow matrix is restructuring during metamorphism. Impacts on polar atmospheric chemistry are discussed.

Jacinta Edebeli et al.

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Jacinta Edebeli et al.

Data sets

Data set on bromide oxidation by ozone in snow during metamorphism 373 from laboratory study. J. Edebeli and T. Bartels-Rausch https://doi.org/10.16904/envidat.138.

Jacinta Edebeli et al.

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Latest update: 11 Aug 2020
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Short summary
Earth’s snow cover is very dynamic and can change its physical properties within hours, as is well known by skiers. Snow is also known as a host for chemical reactions the products of which impact air composition and quality. Here, we present laboratory experiments that show how the dynamics of snow (metamorphism) make snow essential uncreative towards gas-phase ozone with time despite its content of reactive chemicals. Impacts on polar atmospheric chemistry are discussed.
Earth’s snow cover is very dynamic and can change its physical properties within hours, as is...
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