Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica
The isotopic signal (δ18O and δD) imprinted in ice cores from Antarctica is not solely generated by the temperature sensitivity of the isotopic composition of precipitation, but it also contains the signature of the intermittency of the precipitation patterns, as well as of post-deposition processes...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00052819 2023-05-15T13:54:46+02:00 Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica Casado, Mathieu Münch, Thomas Laepple, Thomas 2020-08 electronic https://doi.org/10.5194/cp-16-1581-2020 https://noa.gwlb.de/receive/cop_mods_00052819 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052472/cp-16-1581-2020.pdf https://cp.copernicus.org/articles/16/1581/2020/cp-16-1581-2020.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-16-1581-2020 https://noa.gwlb.de/receive/cop_mods_00052819 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052472/cp-16-1581-2020.pdf https://cp.copernicus.org/articles/16/1581/2020/cp-16-1581-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/cp-16-1581-2020 2022-02-08T22:35:48Z The isotopic signal (δ18O and δD) imprinted in ice cores from Antarctica is not solely generated by the temperature sensitivity of the isotopic composition of precipitation, but it also contains the signature of the intermittency of the precipitation patterns, as well as of post-deposition processes occurring at the surface and in the firn. This leads to a proxy signal recorded by the ice cores that may not be representative of the local climate variations. Due to precipitation intermittency, the ice cores only record brief snapshots of the climatic conditions, resulting in aliasing of the climatic signal and thus a large amount of noise which reduces the minimum temporal resolution at which a meaningful signal can be retrieved. The analyses are further complicated by isotopic diffusion, which acts as a low-pass filter that dampens any high-frequency changes. Here, we use reanalysis data (ERA-Interim) combined with satellite products of accumulation to evaluate the spatial distribution of the numerical estimates of the transfer function that describes the formation of the isotopic signal across Antarctica. As a result, the minimum timescales at which the signal-to-noise ratio exceeds unity range from less than 1 year at the coast to about 1000 years further inland. Based on solely physical processes, we are thus able to define a lower bound for the timescales at which climate variability can be reconstructed from the isotopic composition in ice cores. Article in Journal/Newspaper Antarc* Antarctica Niedersächsisches Online-Archiv NOA Climate of the Past 16 4 1581 1598 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Casado, Mathieu Münch, Thomas Laepple, Thomas Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
The isotopic signal (δ18O and δD) imprinted in ice cores from Antarctica is not solely generated by the temperature sensitivity of the isotopic composition of precipitation, but it also contains the signature of the intermittency of the precipitation patterns, as well as of post-deposition processes occurring at the surface and in the firn. This leads to a proxy signal recorded by the ice cores that may not be representative of the local climate variations. Due to precipitation intermittency, the ice cores only record brief snapshots of the climatic conditions, resulting in aliasing of the climatic signal and thus a large amount of noise which reduces the minimum temporal resolution at which a meaningful signal can be retrieved. The analyses are further complicated by isotopic diffusion, which acts as a low-pass filter that dampens any high-frequency changes. Here, we use reanalysis data (ERA-Interim) combined with satellite products of accumulation to evaluate the spatial distribution of the numerical estimates of the transfer function that describes the formation of the isotopic signal across Antarctica. As a result, the minimum timescales at which the signal-to-noise ratio exceeds unity range from less than 1 year at the coast to about 1000 years further inland. Based on solely physical processes, we are thus able to define a lower bound for the timescales at which climate variability can be reconstructed from the isotopic composition in ice cores. |
format |
Article in Journal/Newspaper |
author |
Casado, Mathieu Münch, Thomas Laepple, Thomas |
author_facet |
Casado, Mathieu Münch, Thomas Laepple, Thomas |
author_sort |
Casado, Mathieu |
title |
Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
title_short |
Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
title_full |
Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
title_fullStr |
Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
title_full_unstemmed |
Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica |
title_sort |
climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in antarctica |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-1581-2020 https://noa.gwlb.de/receive/cop_mods_00052819 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052472/cp-16-1581-2020.pdf https://cp.copernicus.org/articles/16/1581/2020/cp-16-1581-2020.pdf |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
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-16-1581-2020 https://noa.gwlb.de/receive/cop_mods_00052819 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00052472/cp-16-1581-2020.pdf https://cp.copernicus.org/articles/16/1581/2020/cp-16-1581-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-16-1581-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
4 |
container_start_page |
1581 |
op_container_end_page |
1598 |
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1766260876587827200 |