Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland
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 ob...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-16-2709-2022 https://tc.copernicus.org/articles/16/2709/2022/tc-16-2709-2022.pdf https://doaj.org/article/36ff80d0eb184466af2555c3e18925b6 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:36ff80d0eb184466af2555c3e18925b6 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:36ff80d0eb184466af2555c3e18925b6 2023-05-15T16:28:44+02:00 Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland Z. Jiang J. Savarino B. Alexander J. Erbland J.-L. Jaffrezo L. Geng 2022-07-01 https://doi.org/10.5194/tc-16-2709-2022 https://tc.copernicus.org/articles/16/2709/2022/tc-16-2709-2022.pdf https://doaj.org/article/36ff80d0eb184466af2555c3e18925b6 en eng Copernicus Publications doi:10.5194/tc-16-2709-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2709/2022/tc-16-2709-2022.pdf https://doaj.org/article/36ff80d0eb184466af2555c3e18925b6 undefined The Cryosphere, Vol 16, Pp 2709-2724 (2022) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-2709-2022 2023-01-22T19:26:02Z 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 atmospheric samples. This likely suggests the ... Article in Journal/Newspaper Greenland ice core The Cryosphere Unknown Greenland The Cryosphere 16 7 2709 2724 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Z. Jiang J. Savarino B. Alexander J. Erbland J.-L. Jaffrezo L. Geng Impacts of post-depositional processing on nitrate isotopes in the snow and the overlying atmosphere at Summit, Greenland |
topic_facet |
envir geo |
description |
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 atmospheric samples. This likely suggests the ... |
format |
Article in Journal/Newspaper |
author |
Z. Jiang J. Savarino B. Alexander J. Erbland J.-L. Jaffrezo L. Geng |
author_facet |
Z. Jiang J. Savarino B. Alexander J. Erbland J.-L. Jaffrezo L. Geng |
author_sort |
Z. Jiang |
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 |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-2709-2022 https://tc.copernicus.org/articles/16/2709/2022/tc-16-2709-2022.pdf https://doaj.org/article/36ff80d0eb184466af2555c3e18925b6 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core The Cryosphere |
genre_facet |
Greenland ice core The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 2709-2724 (2022) |
op_relation |
doi:10.5194/tc-16-2709-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2709/2022/tc-16-2709-2022.pdf https://doaj.org/article/36ff80d0eb184466af2555c3e18925b6 |
op_rights |
undefined |
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 |
_version_ |
1766018414615199744 |