Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica
International audience Stable isotope ratios of nitrate preserved in deep ice cores are expected to provide unique and valuable information regarding paleoatmospheric processes. However, due to the post-depositional loss of nitrate in snow, this information may be erased or significantly modified by...
Published in: | Atmospheric Chemistry and Physics |
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HAL CCSD
2015
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690/document https://hal-insu.archives-ouvertes.fr/insu-01287690/file/ATMOSPHERIC%20CHEMISTRY%20AND%20PHYSICS-%20Isotopic%20effects%20of%20nitrate%20photochemistry%20in%20snow%20a%20field%20study%20at%20Dome%20C%20Antarctica.pdf https://doi.org/10.5194/acp-15-11243-2015 |
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[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Berhanu, Tesfaye, Savarino, J Erbland, J Vicars, W.C Preunkert, S Martins, J.F M.S., Johnson Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Stable isotope ratios of nitrate preserved in deep ice cores are expected to provide unique and valuable information regarding paleoatmospheric processes. However, due to the post-depositional loss of nitrate in snow, this information may be erased or significantly modified by physical or photochemical processes before preservation in ice. We investigated the role of solar UV photolysis in the post-depositional modification of nitrate mass and stable isotope ratios at Dome C, Antarctica, during the austral summer of 2011/2012. Two 30 cm snow pits were filled with homogenized drifted snow from the vicinity of the base. One of these pits was covered with a plexiglass plate that transmits solar UV radiation, while the other was covered with a different plexiglass plate having a low UV transmittance. Samples were then collected from each pit at a 2–5 cm depth resolution and a 10-day frequency. At the end of the season, a comparable nitrate mass loss was observed in both pits for the top-level samples (0–7 cm) attributed to mixing with the surrounding snow. After excluding samples impacted by the mixing process, we derived an average apparent nitrogen isotopic fractionation (15εapp) of −67.8 ± 12 ‰ for the snow nitrate exposed to solar UV using the nitrate stable isotope ratios and concentration measurements. For the control samples in which solar UV was blocked, an apparent average 15εapp value of −12.0 ± 1.7 ‰ was derived. This difference strongly suggests that solar UV photolysis plays a dominant role in driving the isotopic fractionation of nitrate in snow. We have estimated a purely photolytic nitrogen isotopic fractionation (15εphoto) of −55.8 ± 12.0 ‰ from the difference in the derived apparent isotopic fractionations of the two experimental fields, as both pits were exposed to similar physical processes except exposure to solar UV. This value is in close agreement with the 15εphoto value of −47.9 ± 6.8 ‰ derived in a laboratory experiment simulated for Dome C conditions (Berhanu et ... |
author2 |
Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-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 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) Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-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) Copenhagen Chemistry Atmospheric Research (CCAR) University of Copenhagen = Københavns Universitet (KU) |
format |
Article in Journal/Newspaper |
author |
Berhanu, Tesfaye, Savarino, J Erbland, J Vicars, W.C Preunkert, S Martins, J.F M.S., Johnson |
author_facet |
Berhanu, Tesfaye, Savarino, J Erbland, J Vicars, W.C Preunkert, S Martins, J.F M.S., Johnson |
author_sort |
Berhanu, Tesfaye, |
title |
Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
title_short |
Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
title_full |
Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
title_fullStr |
Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
title_full_unstemmed |
Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica |
title_sort |
isotopic effects of nitrate photochemistry in snow: a field study at dome c, antarctica |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690/document https://hal-insu.archives-ouvertes.fr/insu-01287690/file/ATMOSPHERIC%20CHEMISTRY%20AND%20PHYSICS-%20Isotopic%20effects%20of%20nitrate%20photochemistry%20in%20snow%20a%20field%20study%20at%20Dome%20C%20Antarctica.pdf https://doi.org/10.5194/acp-15-11243-2015 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal-insu.archives-ouvertes.fr/insu-01287690 Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2015, 15 (9), pp.11243-11256. ⟨10.5194/acp-15-11243-2015⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-11243-2015 insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690/document https://hal-insu.archives-ouvertes.fr/insu-01287690/file/ATMOSPHERIC%20CHEMISTRY%20AND%20PHYSICS-%20Isotopic%20effects%20of%20nitrate%20photochemistry%20in%20snow%20a%20field%20study%20at%20Dome%20C%20Antarctica.pdf doi:10.5194/acp-15-11243-2015 |
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info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-15-11243-2015 |
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Atmospheric Chemistry and Physics |
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19 |
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11243 |
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ftccsdartic:oai:HAL:insu-01287690v1 2023-05-15T13:34:39+02:00 Isotopic effects of nitrate photochemistry in snow: a field study at Dome C, Antarctica Berhanu, Tesfaye, Savarino, J Erbland, J Vicars, W.C Preunkert, S Martins, J.F M.S., Johnson Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-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 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) Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-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) Copenhagen Chemistry Atmospheric Research (CCAR) University of Copenhagen = Københavns Universitet (KU) 2015 https://hal-insu.archives-ouvertes.fr/insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690/document https://hal-insu.archives-ouvertes.fr/insu-01287690/file/ATMOSPHERIC%20CHEMISTRY%20AND%20PHYSICS-%20Isotopic%20effects%20of%20nitrate%20photochemistry%20in%20snow%20a%20field%20study%20at%20Dome%20C%20Antarctica.pdf https://doi.org/10.5194/acp-15-11243-2015 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-11243-2015 insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690 https://hal-insu.archives-ouvertes.fr/insu-01287690/document https://hal-insu.archives-ouvertes.fr/insu-01287690/file/ATMOSPHERIC%20CHEMISTRY%20AND%20PHYSICS-%20Isotopic%20effects%20of%20nitrate%20photochemistry%20in%20snow%20a%20field%20study%20at%20Dome%20C%20Antarctica.pdf doi:10.5194/acp-15-11243-2015 info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal-insu.archives-ouvertes.fr/insu-01287690 Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2015, 15 (9), pp.11243-11256. ⟨10.5194/acp-15-11243-2015⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.5194/acp-15-11243-2015 2021-10-24T10:40:18Z International audience Stable isotope ratios of nitrate preserved in deep ice cores are expected to provide unique and valuable information regarding paleoatmospheric processes. However, due to the post-depositional loss of nitrate in snow, this information may be erased or significantly modified by physical or photochemical processes before preservation in ice. We investigated the role of solar UV photolysis in the post-depositional modification of nitrate mass and stable isotope ratios at Dome C, Antarctica, during the austral summer of 2011/2012. Two 30 cm snow pits were filled with homogenized drifted snow from the vicinity of the base. One of these pits was covered with a plexiglass plate that transmits solar UV radiation, while the other was covered with a different plexiglass plate having a low UV transmittance. Samples were then collected from each pit at a 2–5 cm depth resolution and a 10-day frequency. At the end of the season, a comparable nitrate mass loss was observed in both pits for the top-level samples (0–7 cm) attributed to mixing with the surrounding snow. After excluding samples impacted by the mixing process, we derived an average apparent nitrogen isotopic fractionation (15εapp) of −67.8 ± 12 ‰ for the snow nitrate exposed to solar UV using the nitrate stable isotope ratios and concentration measurements. For the control samples in which solar UV was blocked, an apparent average 15εapp value of −12.0 ± 1.7 ‰ was derived. This difference strongly suggests that solar UV photolysis plays a dominant role in driving the isotopic fractionation of nitrate in snow. We have estimated a purely photolytic nitrogen isotopic fractionation (15εphoto) of −55.8 ± 12.0 ‰ from the difference in the derived apparent isotopic fractionations of the two experimental fields, as both pits were exposed to similar physical processes except exposure to solar UV. This value is in close agreement with the 15εphoto value of −47.9 ± 6.8 ‰ derived in a laboratory experiment simulated for Dome C conditions (Berhanu et ... Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Austral Atmospheric Chemistry and Physics 15 19 11243 11256 |