Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction
High-alpine glaciers are valuable archives of past climatic and environmental conditions. The interpretation of the preserved signal requires a precise chronology. Radiocarbon (14C) dating of the water-insoluble organic carbon (WIOC) fraction has become an important dating tool to constrain the age...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00056071 2024-09-15T18:12:03+00:00 Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction Fang, Ling Jenk, Theo M. Singer, Thomas Hou, Shugui Schwikowski, Margit 2021-03 electronic https://doi.org/10.5194/tc-15-1537-2021 https://noa.gwlb.de/receive/cop_mods_00056071 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055722/tc-15-1537-2021.pdf https://tc.copernicus.org/articles/15/1537/2021/tc-15-1537-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1537-2021 https://noa.gwlb.de/receive/cop_mods_00056071 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055722/tc-15-1537-2021.pdf https://tc.copernicus.org/articles/15/1537/2021/tc-15-1537-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-1537-2021 2024-06-26T04:40:00Z High-alpine glaciers are valuable archives of past climatic and environmental conditions. The interpretation of the preserved signal requires a precise chronology. Radiocarbon (14C) dating of the water-insoluble organic carbon (WIOC) fraction has become an important dating tool to constrain the age of ice cores from mid-latitude and low-latitude glaciers. However, in some cases this method is restricted by the low WIOC concentration in the ice. In this work, we report first 14C dating results using the dissolved organic carbon (DOC) fraction, which is present at concentrations of at least a factor of 2 higher than the WIOC fraction. We evaluated this new approach by comparison to the established WIO14C dating based on parallel ice core sample sections from four different Eurasian glaciers covering an age range of several hundred to around 20 000 years; 14C dating of the two fractions yielded comparable ages, with WIO14C revealing a slight, barely significant, systematic offset towards older ages comparable in magnitude with the analytical uncertainty. We attribute this offset to two effects of about equal size but opposite in direction: (i) in-situ-produced 14C contributing to the DOC resulting in a bias towards younger ages and (ii) incompletely removed carbonates from particulate mineral dust (14C-depleted) contributing to the WIOC fraction with a bias towards older ages. The estimated amount of in-situ-produced 14C in the DOC fraction is smaller than the analytical uncertainty for most samples. Nevertheless, under extreme conditions, such as very high altitude and/or low snow accumulation rates, DO14C dating results need to be interpreted cautiously. While during DOC extraction the removal of inorganic carbon is monitored for completeness, the removal for WIOC samples was so far only assumed to be quantitative, at least for ice samples containing average levels of mineral dust. Here we estimated an average removal efficiency of 98±2 %, resulting in a small offset of the order of the current analytical ... Article in Journal/Newspaper ice core The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 15 3 1537 1550 |
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article Verlagsveröffentlichung Fang, Ling Jenk, Theo M. Singer, Thomas Hou, Shugui Schwikowski, Margit Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
topic_facet |
article Verlagsveröffentlichung |
description |
High-alpine glaciers are valuable archives of past climatic and environmental conditions. The interpretation of the preserved signal requires a precise chronology. Radiocarbon (14C) dating of the water-insoluble organic carbon (WIOC) fraction has become an important dating tool to constrain the age of ice cores from mid-latitude and low-latitude glaciers. However, in some cases this method is restricted by the low WIOC concentration in the ice. In this work, we report first 14C dating results using the dissolved organic carbon (DOC) fraction, which is present at concentrations of at least a factor of 2 higher than the WIOC fraction. We evaluated this new approach by comparison to the established WIO14C dating based on parallel ice core sample sections from four different Eurasian glaciers covering an age range of several hundred to around 20 000 years; 14C dating of the two fractions yielded comparable ages, with WIO14C revealing a slight, barely significant, systematic offset towards older ages comparable in magnitude with the analytical uncertainty. We attribute this offset to two effects of about equal size but opposite in direction: (i) in-situ-produced 14C contributing to the DOC resulting in a bias towards younger ages and (ii) incompletely removed carbonates from particulate mineral dust (14C-depleted) contributing to the WIOC fraction with a bias towards older ages. The estimated amount of in-situ-produced 14C in the DOC fraction is smaller than the analytical uncertainty for most samples. Nevertheless, under extreme conditions, such as very high altitude and/or low snow accumulation rates, DO14C dating results need to be interpreted cautiously. While during DOC extraction the removal of inorganic carbon is monitored for completeness, the removal for WIOC samples was so far only assumed to be quantitative, at least for ice samples containing average levels of mineral dust. Here we estimated an average removal efficiency of 98±2 %, resulting in a small offset of the order of the current analytical ... |
format |
Article in Journal/Newspaper |
author |
Fang, Ling Jenk, Theo M. Singer, Thomas Hou, Shugui Schwikowski, Margit |
author_facet |
Fang, Ling Jenk, Theo M. Singer, Thomas Hou, Shugui Schwikowski, Margit |
author_sort |
Fang, Ling |
title |
Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
title_short |
Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
title_full |
Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
title_fullStr |
Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
title_full_unstemmed |
Radiocarbon dating of alpine ice cores with the dissolved organic carbon (DOC) fraction |
title_sort |
radiocarbon dating of alpine ice cores with the dissolved organic carbon (doc) fraction |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-1537-2021 https://noa.gwlb.de/receive/cop_mods_00056071 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055722/tc-15-1537-2021.pdf https://tc.copernicus.org/articles/15/1537/2021/tc-15-1537-2021.pdf |
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ice core The Cryosphere |
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ice core The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1537-2021 https://noa.gwlb.de/receive/cop_mods_00056071 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055722/tc-15-1537-2021.pdf https://tc.copernicus.org/articles/15/1537/2021/tc-15-1537-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-1537-2021 |
container_title |
The Cryosphere |
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15 |
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3 |
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1537 |
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1550 |
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1810449646654324736 |