Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores
Methane synchronisation is a concept to align ice core records during rapid climate changes of the Dansgaard/Oeschger (D/O) events onto a common age scale. However, atmospheric gases are recorded in ice cores with a log-normal-shaped age distribution probability density function, whose exact shape d...
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ftcopernicus:oai:publications.copernicus.org:cpd8066 2023-05-15T13:36:36+02:00 Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores Köhler, P. 2018-09-26 application/pdf https://doi.org/10.5194/cpd-6-1453-2010 https://cp.copernicus.org/preprints/cp-2010-49/ eng eng doi:10.5194/cpd-6-1453-2010 https://cp.copernicus.org/preprints/cp-2010-49/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cpd-6-1453-2010 2020-07-20T16:26:22Z Methane synchronisation is a concept to align ice core records during rapid climate changes of the Dansgaard/Oeschger (D/O) events onto a common age scale. However, atmospheric gases are recorded in ice cores with a log-normal-shaped age distribution probability density function, whose exact shape depends mainly on the accumulation rate on the drilling site. This age distribution effectively shifts the mid-transition points of rapid changes in CH 4 measured in situ in ice by about 58% of the width of the age distribution with respect to the atmospheric signal. A minimum dating uncertainty, or artefact, in the CH 4 synchronisation is therefore embedded in the concept itself, which was not accounted for in previous error estimates. This synchronisation artefact between Greenland and Antarctic ice cores is for GRIP and Byrd less than 40 years, well within the dating uncertainty of CH 4 , and therefore does not calls the overall concept of the bipolar seesaw into question. However, if the EPICA Dome C ice core is aligned via CH 4 to NGRIP this synchronisation artefact is in the most recent unified ice core age scale (Lemieux-Dudon et al., 2010) for LGM climate conditions of the order of three centuries and might need consideration in future gas chronologies. Text Antarc* Antarctic EPICA Greenland GRIP ice core NGRIP Copernicus Publications: E-Journals Antarctic Byrd Greenland |
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Copernicus Publications: E-Journals |
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English |
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Methane synchronisation is a concept to align ice core records during rapid climate changes of the Dansgaard/Oeschger (D/O) events onto a common age scale. However, atmospheric gases are recorded in ice cores with a log-normal-shaped age distribution probability density function, whose exact shape depends mainly on the accumulation rate on the drilling site. This age distribution effectively shifts the mid-transition points of rapid changes in CH 4 measured in situ in ice by about 58% of the width of the age distribution with respect to the atmospheric signal. A minimum dating uncertainty, or artefact, in the CH 4 synchronisation is therefore embedded in the concept itself, which was not accounted for in previous error estimates. This synchronisation artefact between Greenland and Antarctic ice cores is for GRIP and Byrd less than 40 years, well within the dating uncertainty of CH 4 , and therefore does not calls the overall concept of the bipolar seesaw into question. However, if the EPICA Dome C ice core is aligned via CH 4 to NGRIP this synchronisation artefact is in the most recent unified ice core age scale (Lemieux-Dudon et al., 2010) for LGM climate conditions of the order of three centuries and might need consideration in future gas chronologies. |
format |
Text |
author |
Köhler, P. |
spellingShingle |
Köhler, P. Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
author_facet |
Köhler, P. |
author_sort |
Köhler, P. |
title |
Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
title_short |
Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
title_full |
Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
title_fullStr |
Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
title_full_unstemmed |
Rapid changes in ice core gas records – Part 1: On the accuracy of methane synchronisation of ice cores |
title_sort |
rapid changes in ice core gas records – part 1: on the accuracy of methane synchronisation of ice cores |
publishDate |
2018 |
url |
https://doi.org/10.5194/cpd-6-1453-2010 https://cp.copernicus.org/preprints/cp-2010-49/ |
geographic |
Antarctic Byrd Greenland |
geographic_facet |
Antarctic Byrd Greenland |
genre |
Antarc* Antarctic EPICA Greenland GRIP ice core NGRIP |
genre_facet |
Antarc* Antarctic EPICA Greenland GRIP ice core NGRIP |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cpd-6-1453-2010 https://cp.copernicus.org/preprints/cp-2010-49/ |
op_doi |
https://doi.org/10.5194/cpd-6-1453-2010 |
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1766081372931227648 |