Dansgaard–Oeschger events: bifurcation points in the climate system
Dansgaard–Oeschger events are a prominent mode of variability in the records of the last glacial cycle. Various prototype models have been proposed to explain these rapid climate fluctuations, and no agreement has emerged on which may be the more correct for describing the palaeoclimatic signal. In...
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fttriple:oai:gotriple.eu:Ohu1MZT6NsSQ_uU1q82Wi 2023-05-15T15:59:59+02:00 Dansgaard–Oeschger events: bifurcation points in the climate system Cimatoribus, A. A. Drijfhout, S. S. Livina, V. Schrier, G. 2018-09-27 https://doi.org/10.5194/cp-9-323-2013 https://cp.copernicus.org/articles/9/323/2013/ en eng doi:10.5194/cp-9-323-2013 10670/1.fpdtew https://cp.copernicus.org/articles/9/323/2013/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-9-323-2013 2023-01-22T17:54:40Z Dansgaard–Oeschger events are a prominent mode of variability in the records of the last glacial cycle. Various prototype models have been proposed to explain these rapid climate fluctuations, and no agreement has emerged on which may be the more correct for describing the palaeoclimatic signal. In this work, we assess the bimodality of the system, reconstructing the topology of the multi-dimensional attractor over which the climate system evolves. We use high-resolution ice core isotope data to investigate the statistical properties of the climate fluctuations in the period before the onset of the abrupt change. We show that Dansgaard–Oeschger events have weak early warning signals if the ensemble of events is considered. We find that the statistics are consistent with the switches between two different climate equilibrium states in response to a changing external forcing (e.g. solar, ice sheets), either forcing directly the transition or pacing it through stochastic resonance. These findings are most consistent with a model that associates Dansgaard–Oeschger with changing boundary conditions, and with the presence of a bifurcation point. Text Dansgaard-Oeschger events ice core Unknown Climate of the Past 9 1 323 333 |
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envir geo Cimatoribus, A. A. Drijfhout, S. S. Livina, V. Schrier, G. Dansgaard–Oeschger events: bifurcation points in the climate system |
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Dansgaard–Oeschger events are a prominent mode of variability in the records of the last glacial cycle. Various prototype models have been proposed to explain these rapid climate fluctuations, and no agreement has emerged on which may be the more correct for describing the palaeoclimatic signal. In this work, we assess the bimodality of the system, reconstructing the topology of the multi-dimensional attractor over which the climate system evolves. We use high-resolution ice core isotope data to investigate the statistical properties of the climate fluctuations in the period before the onset of the abrupt change. We show that Dansgaard–Oeschger events have weak early warning signals if the ensemble of events is considered. We find that the statistics are consistent with the switches between two different climate equilibrium states in response to a changing external forcing (e.g. solar, ice sheets), either forcing directly the transition or pacing it through stochastic resonance. These findings are most consistent with a model that associates Dansgaard–Oeschger with changing boundary conditions, and with the presence of a bifurcation point. |
format |
Text |
author |
Cimatoribus, A. A. Drijfhout, S. S. Livina, V. Schrier, G. |
author_facet |
Cimatoribus, A. A. Drijfhout, S. S. Livina, V. Schrier, G. |
author_sort |
Cimatoribus, A. A. |
title |
Dansgaard–Oeschger events: bifurcation points in the climate system |
title_short |
Dansgaard–Oeschger events: bifurcation points in the climate system |
title_full |
Dansgaard–Oeschger events: bifurcation points in the climate system |
title_fullStr |
Dansgaard–Oeschger events: bifurcation points in the climate system |
title_full_unstemmed |
Dansgaard–Oeschger events: bifurcation points in the climate system |
title_sort |
dansgaard–oeschger events: bifurcation points in the climate system |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-9-323-2013 https://cp.copernicus.org/articles/9/323/2013/ |
genre |
Dansgaard-Oeschger events ice core |
genre_facet |
Dansgaard-Oeschger events ice core |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-9-323-2013 10670/1.fpdtew https://cp.copernicus.org/articles/9/323/2013/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-9-323-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
1 |
container_start_page |
323 |
op_container_end_page |
333 |
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1766395862091563008 |