Inverse stochastic-dynamic models for high-resolution Greenland ice core records
Proxy records from Greenland ice cores have been studied for several decades, yet many open questions remain regarding the climate variability encoded therein. Here, we use a Bayesian framework for inferring inverse, stochastic-dynamic models from 18O and dust records of unprecedented, subdecadal te...
Published in: | Earth System Dynamics |
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2017
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Online Access: | https://curis.ku.dk/portal/da/publications/inverse-stochasticdynamic-models-for-highresolution-greenland-ice-core-records(63a9e010-c013-4354-834e-900172578093).html https://doi.org/10.5194/esd-8-1171-2017 https://curis.ku.dk/ws/files/196167051/esd_8_1171_2017.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/63a9e010-c013-4354-834e-900172578093 2024-06-09T07:46:18+00:00 Inverse stochastic-dynamic models for high-resolution Greenland ice core records Boers, Niklas Chekroun, Mickael D. Liu, Honghu Kondrashov, Dmitri Rousseau, Denis Didier Svensson, Anders Bigler, Matthias Ghil, Michael 2017 application/pdf https://curis.ku.dk/portal/da/publications/inverse-stochasticdynamic-models-for-highresolution-greenland-ice-core-records(63a9e010-c013-4354-834e-900172578093).html https://doi.org/10.5194/esd-8-1171-2017 https://curis.ku.dk/ws/files/196167051/esd_8_1171_2017.pdf eng eng info:eu-repo/semantics/openAccess Boers , N , Chekroun , M D , Liu , H , Kondrashov , D , Rousseau , D D , Svensson , A , Bigler , M & Ghil , M 2017 , ' Inverse stochastic-dynamic models for high-resolution Greenland ice core records ' , Earth System Dynamics , vol. 8 , no. 4 , pp. 1171-1190 . https://doi.org/10.5194/esd-8-1171-2017 article 2017 ftcopenhagenunip https://doi.org/10.5194/esd-8-1171-2017 2024-05-16T11:29:17Z Proxy records from Greenland ice cores have been studied for several decades, yet many open questions remain regarding the climate variability encoded therein. Here, we use a Bayesian framework for inferring inverse, stochastic-dynamic models from 18O and dust records of unprecedented, subdecadal temporal resolution. The records stem from the North Greenland Ice Core Project (NGRIP), and we focus on the time interval 59-22 ka b2k. Our model reproduces the dynamical characteristics of both the 18O and dust proxy records, including the millennial-scale Dansgaard-Oeschger variability, as well as statistical properties such as probability density functions, waiting times and power spectra, with no need for any external forcing. The crucial ingredients for capturing these properties are (i) high-resolution training data, (ii) cubic drift terms, (iii) nonlinear coupling terms between the 18O and dust time series, and (iv) non-Markovian contributions that represent short-term memory effects. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project Greenland ice cores ice core NGRIP North Greenland North Greenland Ice Core Project University of Copenhagen: Research Greenland Earth System Dynamics 8 4 1171 1190 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Proxy records from Greenland ice cores have been studied for several decades, yet many open questions remain regarding the climate variability encoded therein. Here, we use a Bayesian framework for inferring inverse, stochastic-dynamic models from 18O and dust records of unprecedented, subdecadal temporal resolution. The records stem from the North Greenland Ice Core Project (NGRIP), and we focus on the time interval 59-22 ka b2k. Our model reproduces the dynamical characteristics of both the 18O and dust proxy records, including the millennial-scale Dansgaard-Oeschger variability, as well as statistical properties such as probability density functions, waiting times and power spectra, with no need for any external forcing. The crucial ingredients for capturing these properties are (i) high-resolution training data, (ii) cubic drift terms, (iii) nonlinear coupling terms between the 18O and dust time series, and (iv) non-Markovian contributions that represent short-term memory effects. |
format |
Article in Journal/Newspaper |
author |
Boers, Niklas Chekroun, Mickael D. Liu, Honghu Kondrashov, Dmitri Rousseau, Denis Didier Svensson, Anders Bigler, Matthias Ghil, Michael |
spellingShingle |
Boers, Niklas Chekroun, Mickael D. Liu, Honghu Kondrashov, Dmitri Rousseau, Denis Didier Svensson, Anders Bigler, Matthias Ghil, Michael Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
author_facet |
Boers, Niklas Chekroun, Mickael D. Liu, Honghu Kondrashov, Dmitri Rousseau, Denis Didier Svensson, Anders Bigler, Matthias Ghil, Michael |
author_sort |
Boers, Niklas |
title |
Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
title_short |
Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
title_full |
Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
title_fullStr |
Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
title_full_unstemmed |
Inverse stochastic-dynamic models for high-resolution Greenland ice core records |
title_sort |
inverse stochastic-dynamic models for high-resolution greenland ice core records |
publishDate |
2017 |
url |
https://curis.ku.dk/portal/da/publications/inverse-stochasticdynamic-models-for-highresolution-greenland-ice-core-records(63a9e010-c013-4354-834e-900172578093).html https://doi.org/10.5194/esd-8-1171-2017 https://curis.ku.dk/ws/files/196167051/esd_8_1171_2017.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project Greenland ice cores ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project Greenland ice cores ice core NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Boers , N , Chekroun , M D , Liu , H , Kondrashov , D , Rousseau , D D , Svensson , A , Bigler , M & Ghil , M 2017 , ' Inverse stochastic-dynamic models for high-resolution Greenland ice core records ' , Earth System Dynamics , vol. 8 , no. 4 , pp. 1171-1190 . https://doi.org/10.5194/esd-8-1171-2017 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esd-8-1171-2017 |
container_title |
Earth System Dynamics |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1171 |
op_container_end_page |
1190 |
_version_ |
1801376095428149248 |