A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores
Accurate ice chronologies are needed for the interpretation of paleoclimate reconstructions inferred from ice cores. Several methods are used to provide chronological information: identification of dated horizons along the cores, synchronization to other dated paleoclimatic records, counting of annu...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/45451 2023-05-15T16:06:17+02:00 A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores Lemieux-Dudon, Benedicte Frederic, Parrenin Blayo, Eric http://hdl.handle.net/2115/45451 eng eng Institute of Low Temperature Science, Hokkaido University Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh http://hdl.handle.net/2115/45451 Inverse Methods Ice Core Chronology Paleo-climate 400 bulletin (article) fthokunivhus 2022-11-18T01:02:09Z Accurate ice chronologies are needed for the interpretation of paleoclimate reconstructions inferred from ice cores. Several methods are used to provide chronological information: identification of dated horizons along the cores, synchronization to other dated paleoclimatic records, counting of annual layers or modelling of the ice flow. These methods are relevant for different parts of the core and enable to reach various levels of accuracy. We present a probabilistic approach based on inverse techniques which aims at building an optimal ice core chronology by using all the available chronological information. It consists in identifying the accumulation rate and the thinning function along the core 1) which are as close as possible to the flow model simulations and 2) so that the corresponding ice chronology is as close as possible to independent dating information. This probabilistic approach enables to evaluate confidence intervals on the optimal age scale as well as on the accumulation and the thinning estimates. We test the new method on the EPICA Dome C ice core. The necessary prior accumulation rate and thinning function as well as a set of dated horizons are provided by a previous work aiming at the EDC3 age scale reconstruction. We further discuss the sensitivity of the obtaincd optimal solution with respect to the necessary prior information. This probabilistic approach could be used in the future to build a common and optimal chronology for several ice cores simultaneously. III. Firn densification, close-off and chronology Article in Journal/Newspaper EPICA ice core Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Inverse Methods Ice Core Chronology Paleo-climate 400 |
spellingShingle |
Inverse Methods Ice Core Chronology Paleo-climate 400 Lemieux-Dudon, Benedicte Frederic, Parrenin Blayo, Eric A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
topic_facet |
Inverse Methods Ice Core Chronology Paleo-climate 400 |
description |
Accurate ice chronologies are needed for the interpretation of paleoclimate reconstructions inferred from ice cores. Several methods are used to provide chronological information: identification of dated horizons along the cores, synchronization to other dated paleoclimatic records, counting of annual layers or modelling of the ice flow. These methods are relevant for different parts of the core and enable to reach various levels of accuracy. We present a probabilistic approach based on inverse techniques which aims at building an optimal ice core chronology by using all the available chronological information. It consists in identifying the accumulation rate and the thinning function along the core 1) which are as close as possible to the flow model simulations and 2) so that the corresponding ice chronology is as close as possible to independent dating information. This probabilistic approach enables to evaluate confidence intervals on the optimal age scale as well as on the accumulation and the thinning estimates. We test the new method on the EPICA Dome C ice core. The necessary prior accumulation rate and thinning function as well as a set of dated horizons are provided by a previous work aiming at the EDC3 age scale reconstruction. We further discuss the sensitivity of the obtaincd optimal solution with respect to the necessary prior information. This probabilistic approach could be used in the future to build a common and optimal chronology for several ice cores simultaneously. III. Firn densification, close-off and chronology |
format |
Article in Journal/Newspaper |
author |
Lemieux-Dudon, Benedicte Frederic, Parrenin Blayo, Eric |
author_facet |
Lemieux-Dudon, Benedicte Frederic, Parrenin Blayo, Eric |
author_sort |
Lemieux-Dudon, Benedicte |
title |
A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
title_short |
A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
title_full |
A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
title_fullStr |
A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
title_full_unstemmed |
A Probabilistic Method to Construct an Optimal Ice Chronology for Ice Cores |
title_sort |
probabilistic method to construct an optimal ice chronology for ice cores |
publisher |
Institute of Low Temperature Science, Hokkaido University |
url |
http://hdl.handle.net/2115/45451 |
genre |
EPICA ice core |
genre_facet |
EPICA ice core |
op_relation |
Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh http://hdl.handle.net/2115/45451 |
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1766402182593118208 |