Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland
International audience Abstract. The effect of post-depositional processing on the preservation of snow nitrate isotopes at Summit, Greenland, remains a subject of debate and is relevant to the quantitative interpretation of ice-core nitrate (isotopic) records at high snow accumulation sites. Here w...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.science/hal-04377422 https://hal.science/hal-04377422/document https://hal.science/hal-04377422/file/tc-16-2709-2022.pdf https://doi.org/10.5194/tc-16-2709-2022 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
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English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Jiang, Zhuang Savarino, Joel Alexander, Becky Erbland, Joseph Jaffrezo, Jean-Luc Geng, Lei Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract. The effect of post-depositional processing on the preservation of snow nitrate isotopes at Summit, Greenland, remains a subject of debate and is relevant to the quantitative interpretation of ice-core nitrate (isotopic) records at high snow accumulation sites. Here we present the first year-round observations of atmospheric nitrate and its isotopic compositions at Summit and compare them with published surface snow and snowpack observations. The atmospheric δ15N(NO3-) remained negative throughout the year, ranging from −3.1 ‰ to −47.9 ‰ with a mean of (−14.8 ± 7.3) ‰ (n=54), and displayed minima in spring which are distinct from the observed spring δ15N(NO3-) maxima in snowpack. The spring average atmospheric δ15N(NO3-) was (−17.9 ± 8.3) ‰ (n=21), significantly depleted compared to the snowpack spring average of (4.6 ± 2.1) ‰, while the surface snow δ15N(NO3-) of (−6.8 ± 0.5) ‰ was in between the atmosphere and the snowpack. The differences in atmospheric, surface snow and snowpack δ15N(NO3-) are best explained by the photo-driven post-depositional processing of snow nitrate, with potential contributions from fractionation during nitrate deposition. In contrast to δ15N(NO3-), the atmospheric Δ17O(NO3-) was of a similar seasonal pattern and magnitude of change to that in the snowpack, suggesting little to no changes in Δ17O(NO3-) from photolysis, consistent with previous modeling results. The atmospheric δ18O(NO3-) varied similarly to atmospheric Δ17O(NO3-), with summer low and winter high values. However, the difference between atmospheric and snow δ18O(NO3-) was larger than that of Δ17O(NO3-). We found a strong correlation between atmospheric δ18O(NO3-) and Δ17O(NO3-) that is very similar to previous measurements for surface snow at Summit, suggesting that atmospheric δ18O(NO3-) versus Δ17O(NO3-) relationships were conserved during deposition. However, we found the linear relationships between δ18O and Δ17O(NO3-) were significantly different for snowpack compared to ... |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) Department of Atmospheric Sciences Seattle University of Washington Seattle Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) School of Earth and Space Sciences Hefei University of Science and Technology of China Hefei (USTC) |
format |
Article in Journal/Newspaper |
author |
Jiang, Zhuang Savarino, Joel Alexander, Becky Erbland, Joseph Jaffrezo, Jean-Luc Geng, Lei |
author_facet |
Jiang, Zhuang Savarino, Joel Alexander, Becky Erbland, Joseph Jaffrezo, Jean-Luc Geng, Lei |
author_sort |
Jiang, Zhuang |
title |
Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
title_short |
Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
title_full |
Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
title_fullStr |
Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
title_full_unstemmed |
Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
title_sort |
impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at summit, greenland |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04377422 https://hal.science/hal-04377422/document https://hal.science/hal-04377422/file/tc-16-2709-2022.pdf https://doi.org/10.5194/tc-16-2709-2022 |
genre |
Greenland ice core The Cryosphere |
genre_facet |
Greenland ice core The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04377422 The Cryosphere, 2022, 16 (7), pp.2709-2724. ⟨10.5194/tc-16-2709-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-2709-2022 hal-04377422 https://hal.science/hal-04377422 https://hal.science/hal-04377422/document https://hal.science/hal-04377422/file/tc-16-2709-2022.pdf doi:10.5194/tc-16-2709-2022 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-16-2709-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
7 |
container_start_page |
2709 |
op_container_end_page |
2724 |
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1796943423764168704 |
spelling |
ftinsu:oai:HAL:hal-04377422v1 2024-04-21T08:03:40+00:00 Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland Jiang, Zhuang Savarino, Joel Alexander, Becky Erbland, Joseph Jaffrezo, Jean-Luc Geng, Lei Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) Department of Atmospheric Sciences Seattle University of Washington Seattle Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) School of Earth and Space Sciences Hefei University of Science and Technology of China Hefei (USTC) 2022-07-12 https://hal.science/hal-04377422 https://hal.science/hal-04377422/document https://hal.science/hal-04377422/file/tc-16-2709-2022.pdf https://doi.org/10.5194/tc-16-2709-2022 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-2709-2022 hal-04377422 https://hal.science/hal-04377422 https://hal.science/hal-04377422/document https://hal.science/hal-04377422/file/tc-16-2709-2022.pdf doi:10.5194/tc-16-2709-2022 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04377422 The Cryosphere, 2022, 16 (7), pp.2709-2724. ⟨10.5194/tc-16-2709-2022⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.5194/tc-16-2709-2022 2024-04-05T00:27:42Z International audience Abstract. The effect of post-depositional processing on the preservation of snow nitrate isotopes at Summit, Greenland, remains a subject of debate and is relevant to the quantitative interpretation of ice-core nitrate (isotopic) records at high snow accumulation sites. Here we present the first year-round observations of atmospheric nitrate and its isotopic compositions at Summit and compare them with published surface snow and snowpack observations. The atmospheric δ15N(NO3-) remained negative throughout the year, ranging from −3.1 ‰ to −47.9 ‰ with a mean of (−14.8 ± 7.3) ‰ (n=54), and displayed minima in spring which are distinct from the observed spring δ15N(NO3-) maxima in snowpack. The spring average atmospheric δ15N(NO3-) was (−17.9 ± 8.3) ‰ (n=21), significantly depleted compared to the snowpack spring average of (4.6 ± 2.1) ‰, while the surface snow δ15N(NO3-) of (−6.8 ± 0.5) ‰ was in between the atmosphere and the snowpack. The differences in atmospheric, surface snow and snowpack δ15N(NO3-) are best explained by the photo-driven post-depositional processing of snow nitrate, with potential contributions from fractionation during nitrate deposition. In contrast to δ15N(NO3-), the atmospheric Δ17O(NO3-) was of a similar seasonal pattern and magnitude of change to that in the snowpack, suggesting little to no changes in Δ17O(NO3-) from photolysis, consistent with previous modeling results. The atmospheric δ18O(NO3-) varied similarly to atmospheric Δ17O(NO3-), with summer low and winter high values. However, the difference between atmospheric and snow δ18O(NO3-) was larger than that of Δ17O(NO3-). We found a strong correlation between atmospheric δ18O(NO3-) and Δ17O(NO3-) that is very similar to previous measurements for surface snow at Summit, suggesting that atmospheric δ18O(NO3-) versus Δ17O(NO3-) relationships were conserved during deposition. However, we found the linear relationships between δ18O and Δ17O(NO3-) were significantly different for snowpack compared to ... Article in Journal/Newspaper Greenland ice core The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 16 7 2709 2724 |