Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica
Experimental observations have shown photochemical production in the upper layers of firn. We use a modeling approach for Antarctica in summer, calculating the actinic flux in snowpack, and estimating NOX production from nitrate photolysis. Assuming nitrate photolysis is about as efficient for ice a...
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American Geophysical Union
2002
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Online Access: | http://nora.nerc.ac.uk/id/eprint/17521/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2002GL015823 |
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ftnerc:oai:nora.nerc.ac.uk:17521 2023-05-15T13:45:12+02:00 Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica Wolff, Eric W. Jones, Anna E. Martin, Timothy J. Grenfell, Thomas C. 2002-10 http://nora.nerc.ac.uk/id/eprint/17521/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2002GL015823 unknown American Geophysical Union Wolff, Eric W.; Jones, Anna E. orcid:0000-0002-2040-4841 Martin, Timothy J.; Grenfell, Thomas C. 2002 Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica. Geophysical Research Letters, 29 (20), 1944. 5-1-5-4. https://doi.org/10.1029/2002GL015823 <https://doi.org/10.1029/2002GL015823> Chemistry Publication - Article PeerReviewed 2002 ftnerc https://doi.org/10.1029/2002GL015823 2023-02-04T19:31:09Z Experimental observations have shown photochemical production in the upper layers of firn. We use a modeling approach for Antarctica in summer, calculating the actinic flux in snowpack, and estimating NOX production from nitrate photolysis. Assuming nitrate photolysis is about as efficient for ice as for aqueous solution, and that all nitrate in the ice is available for photolysis, we find good agreement with measured fluxes of NOX from the snow surface at Neumayer Station, Antarctica. We estimate fluxes for other sites, and confirm that they could significantly affect boundary layer chemistry, especially where an atmospheric surface temperature inversion is present. We find that there is considerably more NOX production in the upper snowpack than in the entire tropospheric column above it. Photolysis explains a proportion of the nitrate loss observed from snow at some sites, but other processes (sorption/desorption) are necessary to explain the magnitude and depth profiles observed. Article in Journal/Newspaper Antarc* Antarctica Natural Environment Research Council: NERC Open Research Archive Neumayer Neumayer Station Geophysical Research Letters 29 20 5-1 5-4 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Chemistry |
spellingShingle |
Chemistry Wolff, Eric W. Jones, Anna E. Martin, Timothy J. Grenfell, Thomas C. Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
topic_facet |
Chemistry |
description |
Experimental observations have shown photochemical production in the upper layers of firn. We use a modeling approach for Antarctica in summer, calculating the actinic flux in snowpack, and estimating NOX production from nitrate photolysis. Assuming nitrate photolysis is about as efficient for ice as for aqueous solution, and that all nitrate in the ice is available for photolysis, we find good agreement with measured fluxes of NOX from the snow surface at Neumayer Station, Antarctica. We estimate fluxes for other sites, and confirm that they could significantly affect boundary layer chemistry, especially where an atmospheric surface temperature inversion is present. We find that there is considerably more NOX production in the upper snowpack than in the entire tropospheric column above it. Photolysis explains a proportion of the nitrate loss observed from snow at some sites, but other processes (sorption/desorption) are necessary to explain the magnitude and depth profiles observed. |
format |
Article in Journal/Newspaper |
author |
Wolff, Eric W. Jones, Anna E. Martin, Timothy J. Grenfell, Thomas C. |
author_facet |
Wolff, Eric W. Jones, Anna E. Martin, Timothy J. Grenfell, Thomas C. |
author_sort |
Wolff, Eric W. |
title |
Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
title_short |
Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
title_full |
Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
title_fullStr |
Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
title_full_unstemmed |
Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica |
title_sort |
modelling photochemical nox production and nitrate loss in the upper snowpack of antarctica |
publisher |
American Geophysical Union |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/17521/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2002GL015823 |
geographic |
Neumayer Neumayer Station |
geographic_facet |
Neumayer Neumayer Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Wolff, Eric W.; Jones, Anna E. orcid:0000-0002-2040-4841 Martin, Timothy J.; Grenfell, Thomas C. 2002 Modelling photochemical NOx production and nitrate loss in the upper snowpack of Antarctica. Geophysical Research Letters, 29 (20), 1944. 5-1-5-4. https://doi.org/10.1029/2002GL015823 <https://doi.org/10.1029/2002GL015823> |
op_doi |
https://doi.org/10.1029/2002GL015823 |
container_title |
Geophysical Research Letters |
container_volume |
29 |
container_issue |
20 |
container_start_page |
5-1 |
op_container_end_page |
5-4 |
_version_ |
1766216357999804416 |