HO2NO2 and HNO3 in the coastal Antarctic winter night: a “lab-in-the-field” experiment
Observations of peroxynitric acid (HO2NO2) and nitric acid (HNO3) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of HO2NO2...
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ftuhipublicatio:oai:pure.atira.dk:publications/607a6326-2113-4dc8-802d-48a7cbe4f8d1 2024-02-04T09:54:42+01:00 HO2NO2 and HNO3 in the coastal Antarctic winter night: a “lab-in-the-field” experiment Jones, A. E. Brough, N. Anderson, Philip Survey, British 2014-10-06 https://pure.uhi.ac.uk/en/publications/607a6326-2113-4dc8-802d-48a7cbe4f8d1 https://doi.org/10.5194/acp-14-11843-2014 eng eng info:eu-repo/semantics/openAccess Jones , A E , Brough , N , Anderson , P & Survey , B 2014 , ' HO2NO2 and HNO3 in the coastal Antarctic winter night: a “lab-in-the-field” experiment ' , Atmospheric Chemistry and Physics , vol. 14 , no. 1 , pp. 11843-11851 . https://doi.org/10.5194/acp-14-11843-2014 article 2014 ftuhipublicatio https://doi.org/10.5194/acp-14-11843-2014 2024-01-11T23:21:10Z Observations of peroxynitric acid (HO2NO2) and nitric acid (HNO3) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of HO2NO2 from detection limits to ~5 pptv; the average ratio of HNO3 : HO2NO2 was 2.0(± 0.6) : 1, with HNO3 always present at greater mixing ratios than HO2NO2 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 HO2NO2, R2 = 0.72, and for HNO3, R2 = 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 (ΔHads) for these three cases. The average ΔHads for HNO3 was −42 ± 2 kJ mol−1 and for HO2NO2 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 HO2NO2 and HNO3 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. Article in Journal/Newspaper Antarc* Antarctic University of the Highlands and Islands: Research Database of UHI Antarctic Atmospheric Chemistry and Physics 14 21 11843 11851 |
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Open Polar |
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University of the Highlands and Islands: Research Database of UHI |
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ftuhipublicatio |
language |
English |
description |
Observations of peroxynitric acid (HO2NO2) and nitric acid (HNO3) were made during a 4 month period of Antarctic winter darkness at the coastal Antarctic research station, Halley. Mixing ratios of HNO3 ranged from instrumental detection limits to ~8 parts per trillion by volume (pptv), and of HO2NO2 from detection limits to ~5 pptv; the average ratio of HNO3 : HO2NO2 was 2.0(± 0.6) : 1, with HNO3 always present at greater mixing ratios than HO2NO2 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 HO2NO2, R2 = 0.72, and for HNO3, R2 = 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 (ΔHads) for these three cases. The average ΔHads for HNO3 was −42 ± 2 kJ mol−1 and for HO2NO2 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 HO2NO2 and HNO3 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 |
Article in Journal/Newspaper |
author |
Jones, A. E. Brough, N. Anderson, Philip Survey, British |
spellingShingle |
Jones, A. E. Brough, N. Anderson, Philip Survey, British HO2NO2 and HNO3 in the coastal Antarctic winter night: a “lab-in-the-field” experiment |
author_facet |
Jones, A. E. Brough, N. Anderson, Philip Survey, British |
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 |
2014 |
url |
https://pure.uhi.ac.uk/en/publications/607a6326-2113-4dc8-802d-48a7cbe4f8d1 https://doi.org/10.5194/acp-14-11843-2014 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Jones , A E , Brough , N , Anderson , P & Survey , B 2014 , ' HO2NO2 and HNO3 in the coastal Antarctic winter night: a “lab-in-the-field” experiment ' , Atmospheric Chemistry and Physics , vol. 14 , no. 1 , pp. 11843-11851 . https://doi.org/10.5194/acp-14-11843-2014 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-14-11843-2014 |
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Atmospheric Chemistry and Physics |
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14 |
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21 |
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11843 |
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11851 |
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