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-deposition processes linked with snow metamorphism remain poorly documented. For...
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Online Access: | http://hdl.handle.net/11368/2798323 https://doi.org/10.5194/cp-10-377-2014 |
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ftunitriestiris:oai:arts.units.it:11368/2798323 2023-05-15T16:26:36+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 A. E. Sveinbjörnsdottír STENNI, BARBARA 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., Landai T., Popp C., Risi K., Steffen Stenni, Barbara A. E., Sveinbjörnsdottír 2014 ELETTRONICO http://hdl.handle.net/11368/2798323 https://doi.org/10.5194/cp-10-377-2014 eng eng volume:10 firstpage:377 lastpage:392 numberofpages:16 journal:CLIMATE OF THE PAST http://hdl.handle.net/11368/2798323 doi:10.5194/cp-10-377-2014 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84896853748 water stable isotope water vapor Greenland info:eu-repo/semantics/article 2014 ftunitriestiris https://doi.org/10.5194/cp-10-377-2014 2023-04-09T06:16:00Z 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-deposition processes linked with snow metamorphism remain poorly documented. For this purpose, a monitoring of the isotopic composition (δ18O, 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 17O-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 strong correlation between surface vapor δ18O 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 δ18O with a stronger slope for vapor than for precipitation and snow surface data. Deuterium excess (d-excess) is strongly anti-correlated with δ18O with a stronger slope for vapor than for precipitation and snow surface data. During nine 1-5 days periods between precipitation events, our data demonstrate parallel changes of δ18O and d-excess in surface snow and surface vapor. The changes in δ18O of the vapor are similar or larger than the snow δ18O. It is estimated that 6 to 20% of the surface snow mass is exchanged with the atmosphere using the CROCUS snow model. In our data, the sign of surface snow isotopic changes are not related to the sign or magnitude of sublimation or deposition. Comparisons with atmospheric models show that day-to-day variations in 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 ... Article in Journal/Newspaper Greenland Greenland ice core ice core Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) Greenland Climate of the Past 10 1 377 392 |
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Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
water stable isotope water vapor Greenland |
spellingShingle |
water stable isotope water vapor Greenland 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 A. E. Sveinbjörnsdottír STENNI, BARBARA What controls the isotopic composition of Greenland surface snow? |
topic_facet |
water stable isotope water vapor Greenland |
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-deposition processes linked with snow metamorphism remain poorly documented. For this purpose, a monitoring of the isotopic composition (δ18O, 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 17O-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 strong correlation between surface vapor δ18O 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 δ18O with a stronger slope for vapor than for precipitation and snow surface data. Deuterium excess (d-excess) is strongly anti-correlated with δ18O with a stronger slope for vapor than for precipitation and snow surface data. During nine 1-5 days periods between precipitation events, our data demonstrate parallel changes of δ18O and d-excess in surface snow and surface vapor. The changes in δ18O of the vapor are similar or larger than the snow δ18O. It is estimated that 6 to 20% of the surface snow mass is exchanged with the atmosphere using the CROCUS snow model. In our data, the sign of surface snow isotopic changes are not related to the sign or magnitude of sublimation or deposition. Comparisons with atmospheric models show that day-to-day variations in 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 ... |
author2 |
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., Landai T., Popp C., Risi K., Steffen Stenni, Barbara A. E., Sveinbjörnsdottír |
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 A. E. Sveinbjörnsdottír STENNI, BARBARA |
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 A. E. Sveinbjörnsdottír STENNI, BARBARA |
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? |
publishDate |
2014 |
url |
http://hdl.handle.net/11368/2798323 https://doi.org/10.5194/cp-10-377-2014 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_relation |
volume:10 firstpage:377 lastpage:392 numberofpages:16 journal:CLIMATE OF THE PAST http://hdl.handle.net/11368/2798323 doi:10.5194/cp-10-377-2014 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84896853748 |
op_doi |
https://doi.org/10.5194/cp-10-377-2014 |
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