Articles | Volume 16, issue 19
Atmos. Chem. Phys., 16, 12531–12550, 2016
https://doi.org/10.5194/acp-16-12531-2016
Atmos. Chem. Phys., 16, 12531–12550, 2016
https://doi.org/10.5194/acp-16-12531-2016
Research article
07 Oct 2016
Research article | 07 Oct 2016

Air–snow exchange of nitrate: a modelling approach to investigate physicochemical processes in surface snow at Dome C, Antarctica

Josué Bock et al.

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We develop a physically based parameterisation of the co-condensation process. Our model includes solid-state diffusion within a snow grain. It reproduces with good agreement the nitrate measurement in surface snow. Winter and summer concentrations are driven respectively by thermodynamic equilibrium and co-condensation. Adsorbed nitrate likely accounts for a minor part. This work shows that co-condensation is required to explain the chemical composition of snow undergoing temperature gradient.
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