A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes
International audience The information contained in polar nitrate has been an unresolved issue for over a decade. Here we demonstrate that atmospheric nitrate's oxygen isotopic composition (Δ17O-NO3) reflects stratospheric chemistry in winter and tropospheric chemistry in summer. Surface snow i...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
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Subjects: | |
Online Access: | https://insu.hal.science/insu-00377182 https://insu.hal.science/insu-00377182/document https://insu.hal.science/insu-00377182/file/2006JD007822.pdf https://doi.org/10.1029/2006JD007822 |
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ftunivsavoie:oai:HAL:insu-00377182v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
nitrate isotopes ozone [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
nitrate isotopes ozone [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Mccabe, Justin R. Thiemens, Mark H. Savarino, Joel A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
topic_facet |
nitrate isotopes ozone [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The information contained in polar nitrate has been an unresolved issue for over a decade. Here we demonstrate that atmospheric nitrate's oxygen isotopic composition (Δ17O-NO3) reflects stratospheric chemistry in winter and tropospheric chemistry in summer. Surface snow isotope mass balance indicates that nitrate oxygen isotopic composition is the result of a mixture of 25% stratospheric and 75% tropospheric origin. Analysis of trends in Δ17O-NO3 in a 6 m snow pit that provides a 26-year record reveals a strong 2.70-year cycle that anticorrelates (R = −0.77) with October–November–December column ozone. The potential mechanisms linking the records are either denitrification or increased boundary layer photochemical ozone production. We suggest that the latter is dominating the observed trend and find that surface ozone and Δ17O-NO3 correlate well before 1991 (R = 0.93). After 1991, however, the records show no significant relationship, indicating an altered oxidative environment consistent with current understanding of a highly oxidizing atmosphere at the South Pole. The disappearance of seasonal Δ17O-NO3 trends in the surface layer at depth remain unresolved and demand further investigation of how postdepositional processes affect nitrate's oxygen isotope composition. Overall, the findings of this study present a new paleoclimate technique to investigate Antarctic nitrate records that appear to reflect trends in stratospheric ozone depletion by recording tropospheric surface ozone variability. |
author2 |
Department of Chemistry and Biochemistry University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) European Science Foundation (ESF) under the EUROCORES Programme EuroCLIMATE, contract ERAS-CT-2003-980409 of the European Commission |
format |
Article in Journal/Newspaper |
author |
Mccabe, Justin R. Thiemens, Mark H. Savarino, Joel |
author_facet |
Mccabe, Justin R. Thiemens, Mark H. Savarino, Joel |
author_sort |
Mccabe, Justin R. |
title |
A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
title_short |
A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
title_full |
A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
title_fullStr |
A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
title_full_unstemmed |
A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes |
title_sort |
record of ozone variability in south pole antarctic snow: role of nitrate oxygen isotopes |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00377182 https://insu.hal.science/insu-00377182/document https://insu.hal.science/insu-00377182/file/2006JD007822.pdf https://doi.org/10.1029/2006JD007822 |
genre |
Antarc* Antarctic South pole South pole |
genre_facet |
Antarc* Antarctic South pole South pole |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://insu.hal.science/insu-00377182 Journal of Geophysical Research: Atmospheres, 2007, 112 (D12303), 1 à 9 p. ⟨10.1029/2006JD007822⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JD007822 insu-00377182 https://insu.hal.science/insu-00377182 https://insu.hal.science/insu-00377182/document https://insu.hal.science/insu-00377182/file/2006JD007822.pdf doi:10.1029/2006JD007822 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006JD007822 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
D12 |
_version_ |
1797572201251078144 |
spelling |
ftunivsavoie:oai:HAL:insu-00377182v1 2024-04-28T07:59:27+00:00 A record of ozone variability in South Pole Antarctic snow: Role of nitrate oxygen isotopes Mccabe, Justin R. Thiemens, Mark H. Savarino, Joel Department of Chemistry and Biochemistry University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) European Science Foundation (ESF) under the EUROCORES Programme EuroCLIMATE, contract ERAS-CT-2003-980409 of the European Commission 2007 https://insu.hal.science/insu-00377182 https://insu.hal.science/insu-00377182/document https://insu.hal.science/insu-00377182/file/2006JD007822.pdf https://doi.org/10.1029/2006JD007822 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JD007822 insu-00377182 https://insu.hal.science/insu-00377182 https://insu.hal.science/insu-00377182/document https://insu.hal.science/insu-00377182/file/2006JD007822.pdf doi:10.1029/2006JD007822 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://insu.hal.science/insu-00377182 Journal of Geophysical Research: Atmospheres, 2007, 112 (D12303), 1 à 9 p. ⟨10.1029/2006JD007822⟩ nitrate isotopes ozone [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2007 ftunivsavoie https://doi.org/10.1029/2006JD007822 2024-04-11T00:42:33Z International audience The information contained in polar nitrate has been an unresolved issue for over a decade. Here we demonstrate that atmospheric nitrate's oxygen isotopic composition (Δ17O-NO3) reflects stratospheric chemistry in winter and tropospheric chemistry in summer. Surface snow isotope mass balance indicates that nitrate oxygen isotopic composition is the result of a mixture of 25% stratospheric and 75% tropospheric origin. Analysis of trends in Δ17O-NO3 in a 6 m snow pit that provides a 26-year record reveals a strong 2.70-year cycle that anticorrelates (R = −0.77) with October–November–December column ozone. The potential mechanisms linking the records are either denitrification or increased boundary layer photochemical ozone production. We suggest that the latter is dominating the observed trend and find that surface ozone and Δ17O-NO3 correlate well before 1991 (R = 0.93). After 1991, however, the records show no significant relationship, indicating an altered oxidative environment consistent with current understanding of a highly oxidizing atmosphere at the South Pole. The disappearance of seasonal Δ17O-NO3 trends in the surface layer at depth remain unresolved and demand further investigation of how postdepositional processes affect nitrate's oxygen isotope composition. Overall, the findings of this study present a new paleoclimate technique to investigate Antarctic nitrate records that appear to reflect trends in stratospheric ozone depletion by recording tropospheric surface ozone variability. Article in Journal/Newspaper Antarc* Antarctic South pole South pole Université Savoie Mont Blanc: HAL Journal of Geophysical Research 112 D12 |