Articles | Volume 16, issue 19
https://doi.org/10.5194/acp-16-12531-2016
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, Joël Savarino, and Ghislain Picard

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Cited articles

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Arora, O. P., Cziczo, D. J., Morgan, A. M., Abbatt, J. P. D., and Niedziela, R. F.: Uptake of nitric acid by sub-micron-sized ice particles, Geophys. Res. Lett., 26, 3621–3624, https://doi.org/10.1029/1999GL010881, 1999.
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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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