North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing
The Mid-Pleistocene transition (MPT) was the time when quasi-periodic (not, vert, similar 100 kyr), high-amplitude glacial variability developed in the absence of any significant change in the character of orbital forcing, leading to the establishment of the characteristic pattern of late Pleistocen...
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ftubarcepubl:oai:diposit.ub.edu:2445/98310 2024-02-11T10:06:14+01:00 North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing Ferretti, P. Crowhurst, S.J. Hall, M. A. Cacho Lascorz, Isabel 2010-04-15 15 p. application/pdf http://hdl.handle.net/2445/98310 eng eng Elsevier B.V. Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.epsl.2010.02.016 Earth and Planetary Science Letters, 2010, vol. 293, num. 1-2, p. 28-41 Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) http://dx.doi.org/10.1016/j.epsl.2010.02.016 0012-821X http://hdl.handle.net/2445/98310 580262 (c) Elsevier B.V., 2010 info:eu-repo/semantics/openAccess Paleoclimatologia Paleoceanografia Atlàntic Oceà Plistocè Paleoclimatology Paleoceanography Atlantic Ocean Pleistocene info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 2010 ftubarcepubl https://doi.org/10.1016/j.epsl.2010.02.016 2024-01-24T00:59:37Z The Mid-Pleistocene transition (MPT) was the time when quasi-periodic (not, vert, similar 100 kyr), high-amplitude glacial variability developed in the absence of any significant change in the character of orbital forcing, leading to the establishment of the characteristic pattern of late Pleistocene climate variability. It has long been known that the interval around 900 ka stands out as a critical point of the MPT, when major glaciations started occurring most notably in the northern hemisphere. Here we examine the record of climatic conditions during this significant interval, using high-resolution stable isotope records from benthic and planktonic foraminifera from a sediment core in the North Atlantic (Integrated Ocean Drilling Program Expedition 306, Site U1313). We have considered the time interval from late in Marine Isotope Stage (MIS) 23 to MIS 20 (910 to 790 ka). Our data indicate that interglacial MIS 21 was a climatically unstable period and was broken into four interstadial periods, which have been identified and correlated across the North Atlantic region. These extra peaks tend to contradict previous studies that interpreted the MIS 21 variability as consisting essentially of a linear response to cyclical changes in orbital parameters. Cooling events in the surface record during MIS 21 were associated with low benthic carbon isotope excursions, suggesting a coupling between surface temperature changes and the strength of the Atlantic meridional overturning circulation. Time series analysis performed on the whole interval indicates that benthic and planktonic oxygen isotopes have significant concentrations of spectral power centered on periods of 10.7 kyr and 6 kyr, which is in agreement with the second and forth harmonic of precession. The excellent correspondence between the foraminifera δ18O records and insolation variations at the Equator in March and September suggests that a mechanism related to low-latitude precession variations, advected to the high latitudes by tropical convective ... Article in Journal/Newspaper North Atlantic Planktonic foraminifera Dipòsit Digital de la Universitat de Barcelona Earth and Planetary Science Letters 293 1-2 28 41 |
institution |
Open Polar |
collection |
Dipòsit Digital de la Universitat de Barcelona |
op_collection_id |
ftubarcepubl |
language |
English |
topic |
Paleoclimatologia Paleoceanografia Atlàntic Oceà Plistocè Paleoclimatology Paleoceanography Atlantic Ocean Pleistocene |
spellingShingle |
Paleoclimatologia Paleoceanografia Atlàntic Oceà Plistocè Paleoclimatology Paleoceanography Atlantic Ocean Pleistocene Ferretti, P. Crowhurst, S.J. Hall, M. A. Cacho Lascorz, Isabel North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
topic_facet |
Paleoclimatologia Paleoceanografia Atlàntic Oceà Plistocè Paleoclimatology Paleoceanography Atlantic Ocean Pleistocene |
description |
The Mid-Pleistocene transition (MPT) was the time when quasi-periodic (not, vert, similar 100 kyr), high-amplitude glacial variability developed in the absence of any significant change in the character of orbital forcing, leading to the establishment of the characteristic pattern of late Pleistocene climate variability. It has long been known that the interval around 900 ka stands out as a critical point of the MPT, when major glaciations started occurring most notably in the northern hemisphere. Here we examine the record of climatic conditions during this significant interval, using high-resolution stable isotope records from benthic and planktonic foraminifera from a sediment core in the North Atlantic (Integrated Ocean Drilling Program Expedition 306, Site U1313). We have considered the time interval from late in Marine Isotope Stage (MIS) 23 to MIS 20 (910 to 790 ka). Our data indicate that interglacial MIS 21 was a climatically unstable period and was broken into four interstadial periods, which have been identified and correlated across the North Atlantic region. These extra peaks tend to contradict previous studies that interpreted the MIS 21 variability as consisting essentially of a linear response to cyclical changes in orbital parameters. Cooling events in the surface record during MIS 21 were associated with low benthic carbon isotope excursions, suggesting a coupling between surface temperature changes and the strength of the Atlantic meridional overturning circulation. Time series analysis performed on the whole interval indicates that benthic and planktonic oxygen isotopes have significant concentrations of spectral power centered on periods of 10.7 kyr and 6 kyr, which is in agreement with the second and forth harmonic of precession. The excellent correspondence between the foraminifera δ18O records and insolation variations at the Equator in March and September suggests that a mechanism related to low-latitude precession variations, advected to the high latitudes by tropical convective ... |
format |
Article in Journal/Newspaper |
author |
Ferretti, P. Crowhurst, S.J. Hall, M. A. Cacho Lascorz, Isabel |
author_facet |
Ferretti, P. Crowhurst, S.J. Hall, M. A. Cacho Lascorz, Isabel |
author_sort |
Ferretti, P. |
title |
North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
title_short |
North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
title_full |
North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
title_fullStr |
North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
title_full_unstemmed |
North Atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
title_sort |
north atlantic millennial-scale climate variability 910 to 790 ka and the role of the equatorial insolation forcing |
publisher |
Elsevier B.V. |
publishDate |
2010 |
url |
http://hdl.handle.net/2445/98310 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.epsl.2010.02.016 Earth and Planetary Science Letters, 2010, vol. 293, num. 1-2, p. 28-41 Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) http://dx.doi.org/10.1016/j.epsl.2010.02.016 0012-821X http://hdl.handle.net/2445/98310 580262 |
op_rights |
(c) Elsevier B.V., 2010 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2010.02.016 |
container_title |
Earth and Planetary Science Letters |
container_volume |
293 |
container_issue |
1-2 |
container_start_page |
28 |
op_container_end_page |
41 |
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1790603802636713984 |