What controls the isotopic composition of Greenland surface snow?
Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, post-depositional processes linked with snow metamorphism remain poorly documented. Fo...
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ftdoajarticles:oai:doaj.org/article:8671cf885feb480e920f4d7b89c383da 2023-05-15T16:27:19+02:00 What controls the isotopic composition of Greenland surface snow? H. C. Steen-Larsen V. Masson-Delmotte M. Hirabayashi R. Winkler K. Satow F. Prié N. Bayou E. Brun K. M. Cuffey D. Dahl-Jensen M. Dumont M. Guillevic S. Kipfstuhl A. Landais T. Popp C. Risi K. Steffen B. Stenni A. E. Sveinbjörnsdottír 2014-02-01T00:00:00Z https://doi.org/10.5194/cp-10-377-2014 https://doaj.org/article/8671cf885feb480e920f4d7b89c383da EN eng Copernicus Publications http://www.clim-past.net/10/377/2014/cp-10-377-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-377-2014 https://doaj.org/article/8671cf885feb480e920f4d7b89c383da Climate of the Past, Vol 10, Iss 1, Pp 377-392 (2014) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/cp-10-377-2014 2022-12-31T14:06:48Z Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, post-depositional processes linked with snow metamorphism remain poorly documented. For this purpose, monitoring of the isotopic composition (δ 18 O, δD) of near-surface water vapor, precipitation and samples of the top (0.5 cm) snow surface has been conducted during two summers (2011–2012) at NEEM, NW Greenland. The samples also include a subset of 17 O-excess measurements over 4 days, and the measurements span the 2012 Greenland heat wave. Our observations are consistent with calculations assuming isotopic equilibrium between surface snow and water vapor. We observe a strong correlation between near-surface vapor δ 18 O and air temperature (0.85 ± 0.11‰ °C −1 ( R = 0.76) for 2012). The correlation with air temperature is not observed in precipitation data or surface snow data. Deuterium excess (d-excess) is strongly anti-correlated with δ 18 O with a stronger slope for vapor than for precipitation and snow surface data. During nine 1–5-day periods between precipitation events, our data demonstrate parallel changes of δ 18 O and d-excess in surface snow and near-surface vapor. The changes in δ 18 O of the vapor are similar or larger than those of the snow δ 18 O. It is estimated using the CROCUS snow model that 6 to 20% of the surface snow mass is exchanged with the atmosphere. In our data, the sign of surface snow isotopic changes is not related to the sign or magnitude of sublimation or deposition. Comparisons with atmospheric models show that day-to-day variations in near-surface vapor isotopic composition are driven by synoptic variations and changes in air mass trajectories and distillation histories. We suggest that, in between precipitation events, changes in the surface snow isotopic composition are driven by these changes in near-surface vapor isotopic composition. This is consistent with an ... Article in Journal/Newspaper Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Greenland Climate of the Past 10 1 377 392 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 H. C. Steen-Larsen V. Masson-Delmotte M. Hirabayashi R. Winkler K. Satow F. Prié N. Bayou E. Brun K. M. Cuffey D. Dahl-Jensen M. Dumont M. Guillevic S. Kipfstuhl A. Landais T. Popp C. Risi K. Steffen B. Stenni A. E. Sveinbjörnsdottír What controls the isotopic composition of Greenland surface snow? |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, post-depositional processes linked with snow metamorphism remain poorly documented. For this purpose, monitoring of the isotopic composition (δ 18 O, δD) of near-surface water vapor, precipitation and samples of the top (0.5 cm) snow surface has been conducted during two summers (2011–2012) at NEEM, NW Greenland. The samples also include a subset of 17 O-excess measurements over 4 days, and the measurements span the 2012 Greenland heat wave. Our observations are consistent with calculations assuming isotopic equilibrium between surface snow and water vapor. We observe a strong correlation between near-surface vapor δ 18 O and air temperature (0.85 ± 0.11‰ °C −1 ( R = 0.76) for 2012). The correlation with air temperature is not observed in precipitation data or surface snow data. Deuterium excess (d-excess) is strongly anti-correlated with δ 18 O with a stronger slope for vapor than for precipitation and snow surface data. During nine 1–5-day periods between precipitation events, our data demonstrate parallel changes of δ 18 O and d-excess in surface snow and near-surface vapor. The changes in δ 18 O of the vapor are similar or larger than those of the snow δ 18 O. It is estimated using the CROCUS snow model that 6 to 20% of the surface snow mass is exchanged with the atmosphere. In our data, the sign of surface snow isotopic changes is not related to the sign or magnitude of sublimation or deposition. Comparisons with atmospheric models show that day-to-day variations in near-surface vapor isotopic composition are driven by synoptic variations and changes in air mass trajectories and distillation histories. We suggest that, in between precipitation events, changes in the surface snow isotopic composition are driven by these changes in near-surface vapor isotopic composition. This is consistent with an ... |
format |
Article in Journal/Newspaper |
author |
H. C. Steen-Larsen V. Masson-Delmotte M. Hirabayashi R. Winkler K. Satow F. Prié N. Bayou E. Brun K. M. Cuffey D. Dahl-Jensen M. Dumont M. Guillevic S. Kipfstuhl A. Landais T. Popp C. Risi K. Steffen B. Stenni A. E. Sveinbjörnsdottír |
author_facet |
H. C. Steen-Larsen V. Masson-Delmotte M. Hirabayashi R. Winkler K. Satow F. Prié N. Bayou E. Brun K. M. Cuffey D. Dahl-Jensen M. Dumont M. Guillevic S. Kipfstuhl A. Landais T. Popp C. Risi K. Steffen B. Stenni A. E. Sveinbjörnsdottír |
author_sort |
H. C. Steen-Larsen |
title |
What controls the isotopic composition of Greenland surface snow? |
title_short |
What controls the isotopic composition of Greenland surface snow? |
title_full |
What controls the isotopic composition of Greenland surface snow? |
title_fullStr |
What controls the isotopic composition of Greenland surface snow? |
title_full_unstemmed |
What controls the isotopic composition of Greenland surface snow? |
title_sort |
what controls the isotopic composition of greenland surface snow? |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-377-2014 https://doaj.org/article/8671cf885feb480e920f4d7b89c383da |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
Climate of the Past, Vol 10, Iss 1, Pp 377-392 (2014) |
op_relation |
http://www.clim-past.net/10/377/2014/cp-10-377-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-377-2014 https://doaj.org/article/8671cf885feb480e920f4d7b89c383da |
op_doi |
https://doi.org/10.5194/cp-10-377-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
1 |
container_start_page |
377 |
op_container_end_page |
392 |
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