Abrupt climate changes and the astronomical theory
International audience Abrupt climate changes constitute a relatively new field of research, which addresses variations occurring in a relatively short time interval of tens to a hundred years. Such time scales do not correspond to the tens or hundreds of thousands of years that the astronomical the...
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ftepunivpsaclay:oai:HAL:insu-03319020v1 2024-06-09T07:45:33+00:00 Abrupt climate changes and the astronomical theory Rousseau, Denis-Didier Bagniewski, Witold Ghil, Michael Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) 2021-08-11 https://insu.hal.science/insu-03319020 https://insu.hal.science/insu-03319020/document https://insu.hal.science/insu-03319020/file/DDR.ea_CP_v8.pdf https://doi.org/10.5194/cp-2021-103 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-2021-103 insu-03319020 https://insu.hal.science/insu-03319020 https://insu.hal.science/insu-03319020/document https://insu.hal.science/insu-03319020/file/DDR.ea_CP_v8.pdf doi:10.5194/cp-2021-103 info:eu-repo/semantics/OpenAccess ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://insu.hal.science/insu-03319020 Climate of the Past Discussions, 2021, ⟨10.5194/cp-2021-103⟩ Astronomical theory of climate abrupt changes Milankovitch Dansgaard-Oeschger events Bond cycles Heinrich events ice rafted debris ice sheets intrinsic climate variability [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2021 ftepunivpsaclay https://doi.org/10.5194/cp-2021-103 2024-05-16T12:10:49Z International audience Abrupt climate changes constitute a relatively new field of research, which addresses variations occurring in a relatively short time interval of tens to a hundred years. Such time scales do not correspond to the tens or hundreds of thousands of years that the astronomical theory of climate addresses. The latter theory involves parameters that are external to the climate system and whose multi-periodic variations are reliably known and almost constant for a large extent of Earth history. Abrupt changes, conversely, appear to involve fast processes that are internal to the climate system; these processes varied considerably during the past 2.6 Myr, and yielded more irregular fluctuations. In this paper, we reexamine the main climate variations determined from the U1308 North Atlantic marine record, which yields a detailed calving history of the Northern Hemisphere ice sheets over the past 3.2 Myr. The magnitude and periodicity of the ice-rafted debris (IRD) events observed in the U1308 record allow one to determine the timing of several abrupt climate changes, the larger ones corresponding to the massive iceberg discharges labeled Heinrich events (HEs). In parallel, abrupt warmings, called Dansgaard-Oeschger (DO) events, have been identified in the Greenland records of the last glaciation cycle. Combining the HE and DO observations, we study a complex mechanism that may lead to the observed millennial-scale variability corresponding to the abrupt climate changes of last 0.9 Myr. This mechanism relies on amended Bond cycles, which group DO events and the associated Greenland stadials into a trend of increased cooling, with IRD events embedded into every stadial, the latest of these being an HE. These Bond cycles may have occurred during the last 0.9 Ma when Northern Hemisphere ice sheets reached their maximum extent and volume, thus becoming a major player in this time interval's climate dynamics. Since the waxing and waning of ice sheets during the Quaternary period are orbitally paced, ... Article in Journal/Newspaper Dansgaard-Oeschger events Greenland North Atlantic École Polytechnique, Université Paris-Saclay: HAL Greenland |
institution |
Open Polar |
collection |
École Polytechnique, Université Paris-Saclay: HAL |
op_collection_id |
ftepunivpsaclay |
language |
English |
topic |
Astronomical theory of climate abrupt changes Milankovitch Dansgaard-Oeschger events Bond cycles Heinrich events ice rafted debris ice sheets intrinsic climate variability [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Astronomical theory of climate abrupt changes Milankovitch Dansgaard-Oeschger events Bond cycles Heinrich events ice rafted debris ice sheets intrinsic climate variability [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Rousseau, Denis-Didier Bagniewski, Witold Ghil, Michael Abrupt climate changes and the astronomical theory |
topic_facet |
Astronomical theory of climate abrupt changes Milankovitch Dansgaard-Oeschger events Bond cycles Heinrich events ice rafted debris ice sheets intrinsic climate variability [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Abrupt climate changes constitute a relatively new field of research, which addresses variations occurring in a relatively short time interval of tens to a hundred years. Such time scales do not correspond to the tens or hundreds of thousands of years that the astronomical theory of climate addresses. The latter theory involves parameters that are external to the climate system and whose multi-periodic variations are reliably known and almost constant for a large extent of Earth history. Abrupt changes, conversely, appear to involve fast processes that are internal to the climate system; these processes varied considerably during the past 2.6 Myr, and yielded more irregular fluctuations. In this paper, we reexamine the main climate variations determined from the U1308 North Atlantic marine record, which yields a detailed calving history of the Northern Hemisphere ice sheets over the past 3.2 Myr. The magnitude and periodicity of the ice-rafted debris (IRD) events observed in the U1308 record allow one to determine the timing of several abrupt climate changes, the larger ones corresponding to the massive iceberg discharges labeled Heinrich events (HEs). In parallel, abrupt warmings, called Dansgaard-Oeschger (DO) events, have been identified in the Greenland records of the last glaciation cycle. Combining the HE and DO observations, we study a complex mechanism that may lead to the observed millennial-scale variability corresponding to the abrupt climate changes of last 0.9 Myr. This mechanism relies on amended Bond cycles, which group DO events and the associated Greenland stadials into a trend of increased cooling, with IRD events embedded into every stadial, the latest of these being an HE. These Bond cycles may have occurred during the last 0.9 Ma when Northern Hemisphere ice sheets reached their maximum extent and volume, thus becoming a major player in this time interval's climate dynamics. Since the waxing and waning of ice sheets during the Quaternary period are orbitally paced, ... |
author2 |
Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Rousseau, Denis-Didier Bagniewski, Witold Ghil, Michael |
author_facet |
Rousseau, Denis-Didier Bagniewski, Witold Ghil, Michael |
author_sort |
Rousseau, Denis-Didier |
title |
Abrupt climate changes and the astronomical theory |
title_short |
Abrupt climate changes and the astronomical theory |
title_full |
Abrupt climate changes and the astronomical theory |
title_fullStr |
Abrupt climate changes and the astronomical theory |
title_full_unstemmed |
Abrupt climate changes and the astronomical theory |
title_sort |
abrupt climate changes and the astronomical theory |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03319020 https://insu.hal.science/insu-03319020/document https://insu.hal.science/insu-03319020/file/DDR.ea_CP_v8.pdf https://doi.org/10.5194/cp-2021-103 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dansgaard-Oeschger events Greenland North Atlantic |
genre_facet |
Dansgaard-Oeschger events Greenland North Atlantic |
op_source |
ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://insu.hal.science/insu-03319020 Climate of the Past Discussions, 2021, ⟨10.5194/cp-2021-103⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-2021-103 insu-03319020 https://insu.hal.science/insu-03319020 https://insu.hal.science/insu-03319020/document https://insu.hal.science/insu-03319020/file/DDR.ea_CP_v8.pdf doi:10.5194/cp-2021-103 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-2021-103 |
_version_ |
1801374976488505344 |