Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core
Accurate estimates of water isotope diffusion lengths are crucial when reconstructing and interpreting water isotope records from ice cores. This is especially true in the deepest, oldest sections of deep ice cores, where thermally enhanced diffusive processes have acted over millennia on extremely...
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ftdoajarticles:oai:doaj.org/article:a27156f447ea485c96183d9305cb1b88 2024-09-15T18:04:52+00:00 Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core F. Shaw A. M. Dolman T. Kunz V. Gkinis T. Laepple 2024-08-01T00:00:00Z https://doi.org/10.5194/tc-18-3685-2024 https://doaj.org/article/a27156f447ea485c96183d9305cb1b88 EN eng Copernicus Publications https://tc.copernicus.org/articles/18/3685/2024/tc-18-3685-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-3685-2024 1994-0416 1994-0424 https://doaj.org/article/a27156f447ea485c96183d9305cb1b88 The Cryosphere, Vol 18, Pp 3685-3698 (2024) Environmental sciences GE1-350 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.5194/tc-18-3685-2024 2024-08-26T15:21:18Z Accurate estimates of water isotope diffusion lengths are crucial when reconstructing and interpreting water isotope records from ice cores. This is especially true in the deepest, oldest sections of deep ice cores, where thermally enhanced diffusive processes have acted over millennia on extremely thinned ice. Previous statistical estimation methods, used with great success in shallower, younger ice cores, falter when applied to these deep sections, as they fail to account for the statistics of the climate on millennial timescales. Here, we present a new method to estimate the diffusion length from water isotope data and apply it to the Marine Isotope Stage 19 (MIS 19) interglacial at the bottom of the EPICA Dome C (EDC, Dome Concordia) ice core. In contrast to the conventional estimator, our method uses other interglacial periods taken from further up in the ice core to estimate the structure of the variability before diffusion. Through use of a Bayesian framework, we are able to constrain our fit while propagating the uncertainty in our assumptions. We estimate a diffusion length of 31±5 cm for the MIS 19 period, which is significantly smaller than previously estimated (40–60 cm). Similar results were obtained for each interglacial used to represent the undiffused climate signal, demonstrating the robustness of our estimate. Our result suggests better preservation of the climate signal at the bottom of EDC and likely other deep ice cores, offering greater potentially recoverable temporal resolution and improved reconstructions through deconvolution. Article in Journal/Newspaper EPICA ice core The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 18 8 3685 3698 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 F. Shaw A. M. Dolman T. Kunz V. Gkinis T. Laepple Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Accurate estimates of water isotope diffusion lengths are crucial when reconstructing and interpreting water isotope records from ice cores. This is especially true in the deepest, oldest sections of deep ice cores, where thermally enhanced diffusive processes have acted over millennia on extremely thinned ice. Previous statistical estimation methods, used with great success in shallower, younger ice cores, falter when applied to these deep sections, as they fail to account for the statistics of the climate on millennial timescales. Here, we present a new method to estimate the diffusion length from water isotope data and apply it to the Marine Isotope Stage 19 (MIS 19) interglacial at the bottom of the EPICA Dome C (EDC, Dome Concordia) ice core. In contrast to the conventional estimator, our method uses other interglacial periods taken from further up in the ice core to estimate the structure of the variability before diffusion. Through use of a Bayesian framework, we are able to constrain our fit while propagating the uncertainty in our assumptions. We estimate a diffusion length of 31±5 cm for the MIS 19 period, which is significantly smaller than previously estimated (40–60 cm). Similar results were obtained for each interglacial used to represent the undiffused climate signal, demonstrating the robustness of our estimate. Our result suggests better preservation of the climate signal at the bottom of EDC and likely other deep ice cores, offering greater potentially recoverable temporal resolution and improved reconstructions through deconvolution. |
format |
Article in Journal/Newspaper |
author |
F. Shaw A. M. Dolman T. Kunz V. Gkinis T. Laepple |
author_facet |
F. Shaw A. M. Dolman T. Kunz V. Gkinis T. Laepple |
author_sort |
F. Shaw |
title |
Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
title_short |
Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
title_full |
Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
title_fullStr |
Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
title_full_unstemmed |
Novel approach to estimate the water isotope diffusion length in deep ice cores with an application to Marine Isotope Stage 19 in the Dome C ice core |
title_sort |
novel approach to estimate the water isotope diffusion length in deep ice cores with an application to marine isotope stage 19 in the dome c ice core |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-3685-2024 https://doaj.org/article/a27156f447ea485c96183d9305cb1b88 |
genre |
EPICA ice core The Cryosphere |
genre_facet |
EPICA ice core The Cryosphere |
op_source |
The Cryosphere, Vol 18, Pp 3685-3698 (2024) |
op_relation |
https://tc.copernicus.org/articles/18/3685/2024/tc-18-3685-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-3685-2024 1994-0416 1994-0424 https://doaj.org/article/a27156f447ea485c96183d9305cb1b88 |
op_doi |
https://doi.org/10.5194/tc-18-3685-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
8 |
container_start_page |
3685 |
op_container_end_page |
3698 |
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1810442471388217344 |