Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles?
NO x measurements were conducted at the Halley Research Station, coastal Antarctica, during the austral summer period 1 January–10 February 2005. A clear NO x diurnal cycle was observed with minimum concentrations close to instrumental detection limit (5 pptv) measured between 04:00–05:00 GMT. NO x...
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ftdoajarticles:oai:doaj.org/article:9010588279cc44a6aae9d736a35ad09f 2023-05-15T13:37:54+02:00 Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? H. K. Roscoe E. W. Wolff A. Saiz-Lopez J. D. Lee A. E. Jones P. S. Anderson R. A. Salmon M. J. Evans W. J. Bloss S. J.-B. Bauguitte J. M. C. Plane 2012-01-01T00:00:00Z https://doi.org/10.5194/acp-12-989-2012 https://doaj.org/article/9010588279cc44a6aae9d736a35ad09f EN eng Copernicus Publications http://www.atmos-chem-phys.net/12/989/2012/acp-12-989-2012.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-12-989-2012 1680-7316 1680-7324 https://doaj.org/article/9010588279cc44a6aae9d736a35ad09f Atmospheric Chemistry and Physics, Vol 12, Iss 2, Pp 989-1002 (2012) Physics QC1-999 Chemistry QD1-999 article 2012 ftdoajarticles https://doi.org/10.5194/acp-12-989-2012 2023-01-08T01:36:43Z NO x measurements were conducted at the Halley Research Station, coastal Antarctica, during the austral summer period 1 January–10 February 2005. A clear NO x diurnal cycle was observed with minimum concentrations close to instrumental detection limit (5 pptv) measured between 04:00–05:00 GMT. NO x concentrations peaked (24 pptv) between 19:00–20:00 GMT, approximately 5 h after local solar noon. An optimised box model of NO x concentrations based on production from in-snow nitrate photolysis and chemical loss derives a mean noon emission rate of 3.48 × 10 8 molec cm −2 s −1 , assuming a 100 m boundary layer mixing height, and a relatively short NO x lifetime of ~6.4 h. This emission rate compares to directly measured values ranging from 2.1 to 12.6 × 10 8 molec cm −2 s −1 made on 3 days at the end of the study period. Calculations of the maximum rate of NO 2 loss via a variety of conventional HO x and halogen oxidation processes show that the lifetime of NO x is predominantly controlled by halogen processing, namely BrNO 3 and INO 3 gas-phase formation and their subsequent heterogeneous uptake. Furthermore the presence of halogen oxides is shown to significantly perturb NO x concentrations by decreasing the NO/NO 2 ratio. We conclude that in coastal Antarctica, the potential ozone production efficiency of NO x emitted from the snowpack is mitigated by the more rapid NO x loss due to halogen nitrate hydrolysis. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Austral Halley Research Station ENVELOPE(-26.209,-26.209,-75.605,-75.605) Atmospheric Chemistry and Physics 12 2 989 1002 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 H. K. Roscoe E. W. Wolff A. Saiz-Lopez J. D. Lee A. E. Jones P. S. Anderson R. A. Salmon M. J. Evans W. J. Bloss S. J.-B. Bauguitte J. M. C. Plane Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
NO x measurements were conducted at the Halley Research Station, coastal Antarctica, during the austral summer period 1 January–10 February 2005. A clear NO x diurnal cycle was observed with minimum concentrations close to instrumental detection limit (5 pptv) measured between 04:00–05:00 GMT. NO x concentrations peaked (24 pptv) between 19:00–20:00 GMT, approximately 5 h after local solar noon. An optimised box model of NO x concentrations based on production from in-snow nitrate photolysis and chemical loss derives a mean noon emission rate of 3.48 × 10 8 molec cm −2 s −1 , assuming a 100 m boundary layer mixing height, and a relatively short NO x lifetime of ~6.4 h. This emission rate compares to directly measured values ranging from 2.1 to 12.6 × 10 8 molec cm −2 s −1 made on 3 days at the end of the study period. Calculations of the maximum rate of NO 2 loss via a variety of conventional HO x and halogen oxidation processes show that the lifetime of NO x is predominantly controlled by halogen processing, namely BrNO 3 and INO 3 gas-phase formation and their subsequent heterogeneous uptake. Furthermore the presence of halogen oxides is shown to significantly perturb NO x concentrations by decreasing the NO/NO 2 ratio. We conclude that in coastal Antarctica, the potential ozone production efficiency of NO x emitted from the snowpack is mitigated by the more rapid NO x loss due to halogen nitrate hydrolysis. |
format |
Article in Journal/Newspaper |
author |
H. K. Roscoe E. W. Wolff A. Saiz-Lopez J. D. Lee A. E. Jones P. S. Anderson R. A. Salmon M. J. Evans W. J. Bloss S. J.-B. Bauguitte J. M. C. Plane |
author_facet |
H. K. Roscoe E. W. Wolff A. Saiz-Lopez J. D. Lee A. E. Jones P. S. Anderson R. A. Salmon M. J. Evans W. J. Bloss S. J.-B. Bauguitte J. M. C. Plane |
author_sort |
H. K. Roscoe |
title |
Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
title_short |
Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
title_full |
Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
title_fullStr |
Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
title_full_unstemmed |
Summertime NO x measurements during the CHABLIS campaign: can source and sink estimates unravel observed diurnal cycles? |
title_sort |
summertime no x measurements during the chablis campaign: can source and sink estimates unravel observed diurnal cycles? |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/acp-12-989-2012 https://doaj.org/article/9010588279cc44a6aae9d736a35ad09f |
long_lat |
ENVELOPE(-26.209,-26.209,-75.605,-75.605) |
geographic |
Austral Halley Research Station |
geographic_facet |
Austral Halley Research Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Atmospheric Chemistry and Physics, Vol 12, Iss 2, Pp 989-1002 (2012) |
op_relation |
http://www.atmos-chem-phys.net/12/989/2012/acp-12-989-2012.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-12-989-2012 1680-7316 1680-7324 https://doaj.org/article/9010588279cc44a6aae9d736a35ad09f |
op_doi |
https://doi.org/10.5194/acp-12-989-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
2 |
container_start_page |
989 |
op_container_end_page |
1002 |
_version_ |
1766099450539802624 |