HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment
Observations of peroxynitric acid (HO 2 NO 2 ) and nitric acid (HNO 3 ) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO 3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of...
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Online Access: | https://doi.org/10.5194/acp-14-11843-2014 https://www.atmos-chem-phys.net/14/11843/2014/ |
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ftcopernicus:oai:publications.copernicus.org:acp25306 2023-05-15T13:43:09+02:00 HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment Jones, A. E. Brough, N. Anderson, P. S. Wolff, E. W. 2018-09-06 application/pdf https://doi.org/10.5194/acp-14-11843-2014 https://www.atmos-chem-phys.net/14/11843/2014/ eng eng doi:10.5194/acp-14-11843-2014 https://www.atmos-chem-phys.net/14/11843/2014/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-14-11843-2014 2019-12-24T09:54:02Z Observations of peroxynitric acid (HO 2 NO 2 ) and nitric acid (HNO 3 ) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO 3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of HO 2 NO 2 from detection limits to ~5 pptv; the average ratio of HNO 3 : HO 2 NO 2 was 2.0(± 0.6) : 1, with HNO 3 always present at greater mixing ratios than HO 2 NO 2 during the winter darkness. An extremely strong association existed for the entire measurement period between mixing ratios of the respective trace gases and temperature: for HO 2 NO 2 , R 2 = 0.72, and for HNO 3 , R 2 = 0.70. We focus on three cases with considerable variation in temperature, where wind speeds were low and constant, such that, with the lack of photochemistry, changes in mixing ratio were likely to be driven by physical mechanisms alone. We derived enthalpies of adsorption (Δ H ads ) for these three cases. The average Δ H ads for HNO 3 was −42 ± 2 kJ mol −1 and for HO 2 NO 2 was −56 ± 1 kJ mol −1 these values are extremely close to those derived in laboratory studies. This exercise demonstrates (i) that adsorption to/desorption from the snow pack should be taken into account when addressing budgets of boundary layer HO 2 NO 2 and HNO 3 at any snow-covered site, and (ii) that Antarctic winter can be used as a natural "laboratory in the field" for testing data on physical exchange mechanisms. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic Atmospheric Chemistry and Physics 14 21 11843 11851 |
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English |
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Observations of peroxynitric acid (HO 2 NO 2 ) and nitric acid (HNO 3 ) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO 3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of HO 2 NO 2 from detection limits to ~5 pptv; the average ratio of HNO 3 : HO 2 NO 2 was 2.0(± 0.6) : 1, with HNO 3 always present at greater mixing ratios than HO 2 NO 2 during the winter darkness. An extremely strong association existed for the entire measurement period between mixing ratios of the respective trace gases and temperature: for HO 2 NO 2 , R 2 = 0.72, and for HNO 3 , R 2 = 0.70. We focus on three cases with considerable variation in temperature, where wind speeds were low and constant, such that, with the lack of photochemistry, changes in mixing ratio were likely to be driven by physical mechanisms alone. We derived enthalpies of adsorption (Δ H ads ) for these three cases. The average Δ H ads for HNO 3 was −42 ± 2 kJ mol −1 and for HO 2 NO 2 was −56 ± 1 kJ mol −1 these values are extremely close to those derived in laboratory studies. This exercise demonstrates (i) that adsorption to/desorption from the snow pack should be taken into account when addressing budgets of boundary layer HO 2 NO 2 and HNO 3 at any snow-covered site, and (ii) that Antarctic winter can be used as a natural "laboratory in the field" for testing data on physical exchange mechanisms. |
format |
Text |
author |
Jones, A. E. Brough, N. Anderson, P. S. Wolff, E. W. |
spellingShingle |
Jones, A. E. Brough, N. Anderson, P. S. Wolff, E. W. HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
author_facet |
Jones, A. E. Brough, N. Anderson, P. S. Wolff, E. W. |
author_sort |
Jones, A. E. |
title |
HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
title_short |
HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
title_full |
HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
title_fullStr |
HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
title_full_unstemmed |
HO2NO2 and HNO3 in the coastal Antarctic winter night: a "lab-in-the-field" experiment |
title_sort |
ho2no2 and hno3 in the coastal antarctic winter night: a "lab-in-the-field" experiment |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-14-11843-2014 https://www.atmos-chem-phys.net/14/11843/2014/ |
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Antarctic |
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Antarctic |
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Antarc* Antarctic |
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Antarc* Antarctic |
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eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-14-11843-2014 https://www.atmos-chem-phys.net/14/11843/2014/ |
op_doi |
https://doi.org/10.5194/acp-14-11843-2014 |
container_title |
Atmospheric Chemistry and Physics |
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14 |
container_issue |
21 |
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11843 |
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11851 |
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