Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer
International audience Here we report the measurement of the comprehensive isotopic composition (δ 15 N, Δ 17 O and δ 18 O) of nitrate at the air-snow interface at Dome C, Antarctica (DC, 75°06' S, 123°19' E), and in snow pits along a transect across the East Antarctic Ice Sheet (EAIS) bet...
Published in: | Atmospheric Chemistry and Physics |
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Main Authors: | , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://insu.hal.science/insu-03621011 https://insu.hal.science/insu-03621011/document https://insu.hal.science/insu-03621011/file/acp-13-6403-2013.pdf https://doi.org/10.5194/acp-13-6403-2013 |
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Université Savoie Mont Blanc: HAL |
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language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Erbland, J. Vicars, W. C. Savarino, J. Morin, S. Frey, M. M. Frosini, D. Vince, E. Martins, J. M. F. Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Here we report the measurement of the comprehensive isotopic composition (δ 15 N, Δ 17 O and δ 18 O) of nitrate at the air-snow interface at Dome C, Antarctica (DC, 75°06' S, 123°19' E), and in snow pits along a transect across the East Antarctic Ice Sheet (EAIS) between 66° S and 78° S. In most of the snow pits, nitrate loss (either by physical release or UV photolysis of nitrate) is observed and fractionation constants associated are calculated. Nitrate collected from snow pits on the plateau (snow accumulation rate below 50 kg m -2 a -1 ) displays average fractionation constants of (-59±10) ‰, (+2.0±1.0) ‰ and (+8.7±2.4)‰ for δ 15 N, Δ 17 O and δ 18 O, respectively. In contrast, snow pits sampled on the coast show distinct isotopic signatures with average fractionation constants of (-16±14) ‰, (-0.2±1.5) ‰ and (+3.1±5.8) ‰, for δ 15 N, Δ 17 O and δ 18 O, respectively. Our observations corroborate that photolysis (associated with a 15 N / 14 N fractionation constant of the order of -48 ‰ according to Frey et al. (2009) is the dominant nitrate loss process on the East Antarctic Plateau, while on the coast the loss is less pronounced and could involve both physical release and photochemical processes. Year-round isotopic measurements at DC show a~close relationship between the Δ 17 O of atmospheric nitrate and Δ 17 O of nitrate in skin layer snow, suggesting a photolytically driven isotopic equilibrium imposed by nitrate recycling at this interface. Atmospheric nitrate deposition may lead to fractionation of the nitrogen isotopes and explain the almost constant shift of the order of 25 ‰ between the δ 15 N values in the atmospheric and skin layer nitrate at DC. Asymptotic δ 15 N(NO 3 - ) values calculated for each snow pit are found to be correlated with the inverse of the snow accumulation rate (ln(δ 15 N as. + 1) = (5.76±0.47) ċ (kg m -2 a -1 / A) + (0.01±0.02)), confirming the strong relationship between the snow accumulation rate and the degree of isotopic fractionation, consistent ... |
author2 |
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) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) 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)-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Erbland, J. Vicars, W. C. Savarino, J. Morin, S. Frey, M. M. Frosini, D. Vince, E. Martins, J. M. F. |
author_facet |
Erbland, J. Vicars, W. C. Savarino, J. Morin, S. Frey, M. M. Frosini, D. Vince, E. Martins, J. M. F. |
author_sort |
Erbland, J. |
title |
Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
title_short |
Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
title_full |
Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
title_fullStr |
Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
title_full_unstemmed |
Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer |
title_sort |
air-snow transfer of nitrate on the east antarctic plateau - part 1: isotopic evidence for a photolytically driven dynamic equilibrium in summer |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://insu.hal.science/insu-03621011 https://insu.hal.science/insu-03621011/document https://insu.hal.science/insu-03621011/file/acp-13-6403-2013.pdf https://doi.org/10.5194/acp-13-6403-2013 |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-03621011 Atmospheric Chemistry and Physics, 2013, 13, pp.6403-6419. ⟨10.5194/acp-13-6403-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-13-6403-2013 insu-03621011 https://insu.hal.science/insu-03621011 https://insu.hal.science/insu-03621011/document https://insu.hal.science/insu-03621011/file/acp-13-6403-2013.pdf BIBCODE: 2013ACP.13.6403E doi:10.5194/acp-13-6403-2013 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-13-6403-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
13 |
container_start_page |
6403 |
op_container_end_page |
6419 |
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1810487245945176064 |
spelling |
ftunivsavoie:oai:HAL:insu-03621011v1 2024-09-15T17:41:08+00:00 Air-snow transfer of nitrate on the East Antarctic Plateau - Part 1: Isotopic evidence for a photolytically driven dynamic equilibrium in summer Erbland, J. Vicars, W. C. Savarino, J. Morin, S. Frey, M. M. Frosini, D. Vince, E. Martins, J. M. F. 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) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) 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)-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS) 2013 https://insu.hal.science/insu-03621011 https://insu.hal.science/insu-03621011/document https://insu.hal.science/insu-03621011/file/acp-13-6403-2013.pdf https://doi.org/10.5194/acp-13-6403-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-13-6403-2013 insu-03621011 https://insu.hal.science/insu-03621011 https://insu.hal.science/insu-03621011/document https://insu.hal.science/insu-03621011/file/acp-13-6403-2013.pdf BIBCODE: 2013ACP.13.6403E doi:10.5194/acp-13-6403-2013 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-03621011 Atmospheric Chemistry and Physics, 2013, 13, pp.6403-6419. ⟨10.5194/acp-13-6403-2013⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2013 ftunivsavoie https://doi.org/10.5194/acp-13-6403-2013 2024-06-24T23:55:55Z International audience Here we report the measurement of the comprehensive isotopic composition (δ 15 N, Δ 17 O and δ 18 O) of nitrate at the air-snow interface at Dome C, Antarctica (DC, 75°06' S, 123°19' E), and in snow pits along a transect across the East Antarctic Ice Sheet (EAIS) between 66° S and 78° S. In most of the snow pits, nitrate loss (either by physical release or UV photolysis of nitrate) is observed and fractionation constants associated are calculated. Nitrate collected from snow pits on the plateau (snow accumulation rate below 50 kg m -2 a -1 ) displays average fractionation constants of (-59±10) ‰, (+2.0±1.0) ‰ and (+8.7±2.4)‰ for δ 15 N, Δ 17 O and δ 18 O, respectively. In contrast, snow pits sampled on the coast show distinct isotopic signatures with average fractionation constants of (-16±14) ‰, (-0.2±1.5) ‰ and (+3.1±5.8) ‰, for δ 15 N, Δ 17 O and δ 18 O, respectively. Our observations corroborate that photolysis (associated with a 15 N / 14 N fractionation constant of the order of -48 ‰ according to Frey et al. (2009) is the dominant nitrate loss process on the East Antarctic Plateau, while on the coast the loss is less pronounced and could involve both physical release and photochemical processes. Year-round isotopic measurements at DC show a~close relationship between the Δ 17 O of atmospheric nitrate and Δ 17 O of nitrate in skin layer snow, suggesting a photolytically driven isotopic equilibrium imposed by nitrate recycling at this interface. Atmospheric nitrate deposition may lead to fractionation of the nitrogen isotopes and explain the almost constant shift of the order of 25 ‰ between the δ 15 N values in the atmospheric and skin layer nitrate at DC. Asymptotic δ 15 N(NO 3 - ) values calculated for each snow pit are found to be correlated with the inverse of the snow accumulation rate (ln(δ 15 N as. + 1) = (5.76±0.47) ċ (kg m -2 a -1 / A) + (0.01±0.02)), confirming the strong relationship between the snow accumulation rate and the degree of isotopic fractionation, consistent ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Université Savoie Mont Blanc: HAL Atmospheric Chemistry and Physics 13 13 6403 6419 |