Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes
A new ice core paleothermometer is introduced based on the temperature dependent diffusion of the stable water isotopes in the firn. A new parameter called differential diffusion length is defined as the difference between the diffusion length of the two stable water isotopologues 2H1H16O and 1H218O...
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Copernicus Publications
2011
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00026488 2023-05-15T16:38:34+02:00 Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes Simonsen, S. B. Johnsen, S. J. Popp, T. J. Vinther, B. M. Gkinis, V. Steen-Larsen, H. C. 2011-12 electronic https://doi.org/10.5194/cp-7-1327-2011 https://noa.gwlb.de/receive/cop_mods_00026488 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026443/cp-7-1327-2011.pdf https://cp.copernicus.org/articles/7/1327/2011/cp-7-1327-2011.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-7-1327-2011 https://noa.gwlb.de/receive/cop_mods_00026488 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026443/cp-7-1327-2011.pdf https://cp.copernicus.org/articles/7/1327/2011/cp-7-1327-2011.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2011 ftnonlinearchiv https://doi.org/10.5194/cp-7-1327-2011 2022-02-08T22:49:13Z A new ice core paleothermometer is introduced based on the temperature dependent diffusion of the stable water isotopes in the firn. A new parameter called differential diffusion length is defined as the difference between the diffusion length of the two stable water isotopologues 2H1H16O and 1H218O. A model treatment of the diffusion process of the firn and the ice is presented along with a method of retrieving the diffusion signal from the ice core record of water isotopes using spectral methods. The model shows how the diffusion process is highly dependent on the inter-annual variations in the surface temperatures. It results in a diffusion length longer than if the firn was isothermal. The longer diffusion length can be explained by the strong nonlinearly behaviour of the saturation pressure over ice in the range of the surface temperature fluctuations. The method has been tested on δ18O and δD measurements, spanning the transition from the last glacial to the holocene, from the NorthGRIP ice core. The surface temperature reconstruction based on the differential diffusion resembles other temperature reconstructions for the NorthGRIP ice core. However, the Allerød warming is seen to be significantly warmer than observed in other ice core based temperature reconstructions. The mechanisms behind this behaviour are not fully understood. The method shows the need of an expansion of high resolution stable water isotope datasets from ice cores. However, the new ice core paleothermometer presented here will give valuable insight into past climate, through the physical process of isotope diffusion in the firn column of ice sheets. Article in Journal/Newspaper ice core Niedersächsisches Online-Archiv NOA Climate of the Past 7 4 1327 1335 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Simonsen, S. B. Johnsen, S. J. Popp, T. J. Vinther, B. M. Gkinis, V. Steen-Larsen, H. C. Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
topic_facet |
article Verlagsveröffentlichung |
description |
A new ice core paleothermometer is introduced based on the temperature dependent diffusion of the stable water isotopes in the firn. A new parameter called differential diffusion length is defined as the difference between the diffusion length of the two stable water isotopologues 2H1H16O and 1H218O. A model treatment of the diffusion process of the firn and the ice is presented along with a method of retrieving the diffusion signal from the ice core record of water isotopes using spectral methods. The model shows how the diffusion process is highly dependent on the inter-annual variations in the surface temperatures. It results in a diffusion length longer than if the firn was isothermal. The longer diffusion length can be explained by the strong nonlinearly behaviour of the saturation pressure over ice in the range of the surface temperature fluctuations. The method has been tested on δ18O and δD measurements, spanning the transition from the last glacial to the holocene, from the NorthGRIP ice core. The surface temperature reconstruction based on the differential diffusion resembles other temperature reconstructions for the NorthGRIP ice core. However, the Allerød warming is seen to be significantly warmer than observed in other ice core based temperature reconstructions. The mechanisms behind this behaviour are not fully understood. The method shows the need of an expansion of high resolution stable water isotope datasets from ice cores. However, the new ice core paleothermometer presented here will give valuable insight into past climate, through the physical process of isotope diffusion in the firn column of ice sheets. |
format |
Article in Journal/Newspaper |
author |
Simonsen, S. B. Johnsen, S. J. Popp, T. J. Vinther, B. M. Gkinis, V. Steen-Larsen, H. C. |
author_facet |
Simonsen, S. B. Johnsen, S. J. Popp, T. J. Vinther, B. M. Gkinis, V. Steen-Larsen, H. C. |
author_sort |
Simonsen, S. B. |
title |
Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
title_short |
Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
title_full |
Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
title_fullStr |
Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
title_full_unstemmed |
Past surface temperatures at the NorthGRIP drill site from the difference in firn diffusion of water isotopes |
title_sort |
past surface temperatures at the northgrip drill site from the difference in firn diffusion of water isotopes |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/cp-7-1327-2011 https://noa.gwlb.de/receive/cop_mods_00026488 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026443/cp-7-1327-2011.pdf https://cp.copernicus.org/articles/7/1327/2011/cp-7-1327-2011.pdf |
genre |
ice core |
genre_facet |
ice core |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-7-1327-2011 https://noa.gwlb.de/receive/cop_mods_00026488 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026443/cp-7-1327-2011.pdf https://cp.copernicus.org/articles/7/1327/2011/cp-7-1327-2011.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-7-1327-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1327 |
op_container_end_page |
1335 |
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