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

Bock, Josué; Savarino, Joël; Picard, Ghislain

doi:10.5194/acp-16-12531-2016

Articles | Volume 16, issue 19

https://doi.org/10.5194/acp-16-12531-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-16-12531-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 16, issue 19

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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Oct 2016	104	31	8	143
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Dec 2016	11	3	0	14
Jan 2017	16	7	2	25
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Cumulative views and downloads (calculated since 08 Mar 2016)

Month	HTML	PDF	XML	Total
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Apr 2016	18	9	1	28
May 2016	15	9	0	24
Jun 2016	2	5	1	8
Jul 2016	7	8	0	15
Aug 2016	8	1	2	11
Sep 2016	9	4	0	13
Oct 2016	104	31	8	143
Nov 2016	8	4	5	17
Dec 2016	11	3	0	14
Jan 2017	16	7	2	25
Feb 2017	8	5	1	14
Mar 2017	19	11	2	32
Apr 2017	30	16	0	46
May 2017	28	12	2	42
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Jul 2017	84	8	0	92
Aug 2017	68	17	0	85
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Dec 2025	31	18	1	50
Jan 2026	39	18	13	70
Feb 2026	4	2	1	7

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Short summary

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.