Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate
We present a 3.2 Myr record of stable isotopes and physical properties at IODP Site U1308 (reoccupation of DSDP Site 609) located within the ice-rafted detritus (IRD) belt of the North Atlantic. We compare the isotope and lithological proxies at Site U1308 with other North Atlantic records (e.g., si...
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ftcopernicus:oai:publications.copernicus.org:cp50134 2023-05-15T17:30:23+02:00 Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate Hodell, David A. Channell, James E. T. 2018-09-27 application/pdf https://doi.org/10.5194/cp-12-1805-2016 https://cp.copernicus.org/articles/12/1805/2016/ eng eng doi:10.5194/cp-12-1805-2016 https://cp.copernicus.org/articles/12/1805/2016/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-12-1805-2016 2020-07-20T16:24:01Z We present a 3.2 Myr record of stable isotopes and physical properties at IODP Site U1308 (reoccupation of DSDP Site 609) located within the ice-rafted detritus (IRD) belt of the North Atlantic. We compare the isotope and lithological proxies at Site U1308 with other North Atlantic records (e.g., sites 982, 607/U1313, and U1304) to reconstruct the history of orbital and millennial-scale climate variability during the Quaternary. The Site U1308 record documents a progressive increase in the intensity of Northern Hemisphere glacial–interglacial cycles during the late Pliocene and Quaternary, with mode transitions at ∼ 2.7, 1.5, 0.9, and 0.65 Ma. These transitions mark times of change in the growth and stability of Northern Hemisphere ice sheets. They also coincide with increases in vertical carbon isotope gradients between the intermediate and deep ocean, suggesting changes in deep carbon storage and atmospheric CO 2 . Orbital and millennial climate variability co-evolved during the Quaternary such that the trend towards larger and thicker ice sheets was accompanied by changes in the style, frequency, and intensity of millennial-scale variability. This co-evolution may be important for explaining the observed patterns of Quaternary climate change. Text North Atlantic Copernicus Publications: E-Journals Climate of the Past 12 9 1805 1828 |
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Copernicus Publications: E-Journals |
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English |
description |
We present a 3.2 Myr record of stable isotopes and physical properties at IODP Site U1308 (reoccupation of DSDP Site 609) located within the ice-rafted detritus (IRD) belt of the North Atlantic. We compare the isotope and lithological proxies at Site U1308 with other North Atlantic records (e.g., sites 982, 607/U1313, and U1304) to reconstruct the history of orbital and millennial-scale climate variability during the Quaternary. The Site U1308 record documents a progressive increase in the intensity of Northern Hemisphere glacial–interglacial cycles during the late Pliocene and Quaternary, with mode transitions at ∼ 2.7, 1.5, 0.9, and 0.65 Ma. These transitions mark times of change in the growth and stability of Northern Hemisphere ice sheets. They also coincide with increases in vertical carbon isotope gradients between the intermediate and deep ocean, suggesting changes in deep carbon storage and atmospheric CO 2 . Orbital and millennial climate variability co-evolved during the Quaternary such that the trend towards larger and thicker ice sheets was accompanied by changes in the style, frequency, and intensity of millennial-scale variability. This co-evolution may be important for explaining the observed patterns of Quaternary climate change. |
format |
Text |
author |
Hodell, David A. Channell, James E. T. |
spellingShingle |
Hodell, David A. Channell, James E. T. Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
author_facet |
Hodell, David A. Channell, James E. T. |
author_sort |
Hodell, David A. |
title |
Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
title_short |
Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
title_full |
Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
title_fullStr |
Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
title_full_unstemmed |
Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate |
title_sort |
mode transitions in northern hemisphere glaciation: co-evolution of millennial and orbital variability in quaternary climate |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-12-1805-2016 https://cp.copernicus.org/articles/12/1805/2016/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-12-1805-2016 https://cp.copernicus.org/articles/12/1805/2016/ |
op_doi |
https://doi.org/10.5194/cp-12-1805-2016 |
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Climate of the Past |
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12 |
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9 |
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1805 |
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1828 |
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1766126746520780800 |