Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate
We report the first measurements of the oxygen isotope anomaly of atmospheric inorganic nitrate from the Arctic. Nitrate samples and complementary data were collected at Alert, Nunavut, Canada (82°30 ' N, 62°19 ' W) in spring 2004. Covering the polar sunrise period, characterized by the oc...
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ftdoajarticles:oai:doaj.org/article:8c0e307e1d184e26a85de361cfd3a0d7 2023-05-15T14:49:21+02:00 Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate S. Morin J. Savarino S. Bekki S. Gong J. W. Bottenheim 2007-01-01T00:00:00Z https://doaj.org/article/8c0e307e1d184e26a85de361cfd3a0d7 EN eng Copernicus Publications http://www.atmos-chem-phys.net/7/1451/2007/acp-7-1451-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/8c0e307e1d184e26a85de361cfd3a0d7 Atmospheric Chemistry and Physics, Vol 7, Iss 5, Pp 1451-1469 (2007) Physics QC1-999 Chemistry QD1-999 article 2007 ftdoajarticles 2022-12-31T00:43:06Z We report the first measurements of the oxygen isotope anomaly of atmospheric inorganic nitrate from the Arctic. Nitrate samples and complementary data were collected at Alert, Nunavut, Canada (82°30 ' N, 62°19 ' W) in spring 2004. Covering the polar sunrise period, characterized by the occurrence of severe boundary layer ozone depletion events (ODEs), our data show a significant correlation between the variations of atmospheric ozone (O 3 ) mixing ratios and Δ 17 O of nitrate (Δ 17 O(NO − 3 )). This relationship can be expressed as: Δ 17 O(NO − 3 )/‰, =(0.15±0.03)×O 3 /(nmol mol –1 )+(29.7±0.7), with R 2 =0.70(n=12), for Δ 17 O(NO − 3 ) ranging between 29 and 35 ‰. We derive mass-balance equations from chemical reactions operating in the Arctic boundary layer, that describe the evolution of Δ 17 O(NO − 3 ) as a function of the concentrations of reactive species and their isotopic characteristics. Changes in the relative importance of O 3 , RO 2 and BrO in the oxidation of NO during ODEs, and the large isotope anomalies of O 3 and BrO, are the driving force for the variability in the measured Δ 17 O(NO − 3 ) . BrONO 2 hydrolysis is found to be a dominant source of nitrate in the Arctic boundary layer, in agreement with recent modeling studies. Article in Journal/Newspaper Arctic Nunavut Directory of Open Access Journals: DOAJ Articles Arctic Nunavut Canada |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
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language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 S. Morin J. Savarino S. Bekki S. Gong J. W. Bottenheim Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We report the first measurements of the oxygen isotope anomaly of atmospheric inorganic nitrate from the Arctic. Nitrate samples and complementary data were collected at Alert, Nunavut, Canada (82°30 ' N, 62°19 ' W) in spring 2004. Covering the polar sunrise period, characterized by the occurrence of severe boundary layer ozone depletion events (ODEs), our data show a significant correlation between the variations of atmospheric ozone (O 3 ) mixing ratios and Δ 17 O of nitrate (Δ 17 O(NO − 3 )). This relationship can be expressed as: Δ 17 O(NO − 3 )/‰, =(0.15±0.03)×O 3 /(nmol mol –1 )+(29.7±0.7), with R 2 =0.70(n=12), for Δ 17 O(NO − 3 ) ranging between 29 and 35 ‰. We derive mass-balance equations from chemical reactions operating in the Arctic boundary layer, that describe the evolution of Δ 17 O(NO − 3 ) as a function of the concentrations of reactive species and their isotopic characteristics. Changes in the relative importance of O 3 , RO 2 and BrO in the oxidation of NO during ODEs, and the large isotope anomalies of O 3 and BrO, are the driving force for the variability in the measured Δ 17 O(NO − 3 ) . BrONO 2 hydrolysis is found to be a dominant source of nitrate in the Arctic boundary layer, in agreement with recent modeling studies. |
format |
Article in Journal/Newspaper |
author |
S. Morin J. Savarino S. Bekki S. Gong J. W. Bottenheim |
author_facet |
S. Morin J. Savarino S. Bekki S. Gong J. W. Bottenheim |
author_sort |
S. Morin |
title |
Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
title_short |
Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
title_full |
Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
title_fullStr |
Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
title_full_unstemmed |
Signature of Arctic surface ozone depletion events in the isotope anomaly (Δ 17 O) of atmospheric nitrate |
title_sort |
signature of arctic surface ozone depletion events in the isotope anomaly (δ 17 o) of atmospheric nitrate |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doaj.org/article/8c0e307e1d184e26a85de361cfd3a0d7 |
geographic |
Arctic Nunavut Canada |
geographic_facet |
Arctic Nunavut Canada |
genre |
Arctic Nunavut |
genre_facet |
Arctic Nunavut |
op_source |
Atmospheric Chemistry and Physics, Vol 7, Iss 5, Pp 1451-1469 (2007) |
op_relation |
http://www.atmos-chem-phys.net/7/1451/2007/acp-7-1451-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/8c0e307e1d184e26a85de361cfd3a0d7 |
_version_ |
1766320408284364800 |