Oceanic forcing of the Marine Isotope Stage 11 interglacial
The interglacial known as Marine Isotope Stage 11 has been proposed to be analogous to the Holocene, owing to similarities in the amplitudes of orbital forcing. It has been difficult to compare the periods, however, because of the long duration of Stage 11 and a lack of detailed knowledge of any ext...
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2009
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ftucl:oai:eprints.ucl.ac.uk.OAI2:101323 2023-05-15T14:02:31+02:00 Oceanic forcing of the Marine Isotope Stage 11 interglacial Dickson, AJ Beer, CJ Dempsey, C Maslin, MA Bendle, JA McClymont, EL Pancost, RD 2009-06 http://discovery.ucl.ac.uk/101323/ unknown NATURE PUBLISHING GROUP NAT GEOSCI , 2 (6) 427 - 432. (2009) DEEP-WATER CIRCULATION PAST 800,000 YEARS LATE PLEISTOCENE CHEMICAL STRATIFICATION ANTARCTIC CLIMATE AGE CALIBRATION ATLANTIC TERMINATIONS TEMPERATURE VARIABILITY Article 2009 ftucl 2016-01-15T02:34:48Z The interglacial known as Marine Isotope Stage 11 has been proposed to be analogous to the Holocene, owing to similarities in the amplitudes of orbital forcing. It has been difficult to compare the periods, however, because of the long duration of Stage 11 and a lack of detailed knowledge of any extreme climate events that may have occurred. Here we use the distinctive phasing between seasurface temperatures and the oxygen-isotope records of benthic foraminifera in the southeast Atlantic Ocean to stratigraphically align the Holocene interglacial with the first half of the Marine Isotope Stage 11 interglacial optimum. This alignment suggests that the second half of Marine Isotope Stage 11 should not be used as a reference for 'pre-anthropogenic' greenhouse-gas emissions. By compiling benthic carbon-isotope records from sites in the Atlantic Ocean on a single timescale, we also find that meridional overturning circulation strengthened about 415,000 years ago, at a time of high orbital obliquity. We propose that this mechanism transported heat to the high northern latitudes, inhibiting significant ice-sheet build-up and prolonging interglacial conditions. We suggest that this mechanism may have also prolonged other interglacial periods throughout the past 800,000 years. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet University College London: UCL Discovery Antarctic |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
DEEP-WATER CIRCULATION PAST 800,000 YEARS LATE PLEISTOCENE CHEMICAL STRATIFICATION ANTARCTIC CLIMATE AGE CALIBRATION ATLANTIC TERMINATIONS TEMPERATURE VARIABILITY |
spellingShingle |
DEEP-WATER CIRCULATION PAST 800,000 YEARS LATE PLEISTOCENE CHEMICAL STRATIFICATION ANTARCTIC CLIMATE AGE CALIBRATION ATLANTIC TERMINATIONS TEMPERATURE VARIABILITY Dickson, AJ Beer, CJ Dempsey, C Maslin, MA Bendle, JA McClymont, EL Pancost, RD Oceanic forcing of the Marine Isotope Stage 11 interglacial |
topic_facet |
DEEP-WATER CIRCULATION PAST 800,000 YEARS LATE PLEISTOCENE CHEMICAL STRATIFICATION ANTARCTIC CLIMATE AGE CALIBRATION ATLANTIC TERMINATIONS TEMPERATURE VARIABILITY |
description |
The interglacial known as Marine Isotope Stage 11 has been proposed to be analogous to the Holocene, owing to similarities in the amplitudes of orbital forcing. It has been difficult to compare the periods, however, because of the long duration of Stage 11 and a lack of detailed knowledge of any extreme climate events that may have occurred. Here we use the distinctive phasing between seasurface temperatures and the oxygen-isotope records of benthic foraminifera in the southeast Atlantic Ocean to stratigraphically align the Holocene interglacial with the first half of the Marine Isotope Stage 11 interglacial optimum. This alignment suggests that the second half of Marine Isotope Stage 11 should not be used as a reference for 'pre-anthropogenic' greenhouse-gas emissions. By compiling benthic carbon-isotope records from sites in the Atlantic Ocean on a single timescale, we also find that meridional overturning circulation strengthened about 415,000 years ago, at a time of high orbital obliquity. We propose that this mechanism transported heat to the high northern latitudes, inhibiting significant ice-sheet build-up and prolonging interglacial conditions. We suggest that this mechanism may have also prolonged other interglacial periods throughout the past 800,000 years. |
format |
Article in Journal/Newspaper |
author |
Dickson, AJ Beer, CJ Dempsey, C Maslin, MA Bendle, JA McClymont, EL Pancost, RD |
author_facet |
Dickson, AJ Beer, CJ Dempsey, C Maslin, MA Bendle, JA McClymont, EL Pancost, RD |
author_sort |
Dickson, AJ |
title |
Oceanic forcing of the Marine Isotope Stage 11 interglacial |
title_short |
Oceanic forcing of the Marine Isotope Stage 11 interglacial |
title_full |
Oceanic forcing of the Marine Isotope Stage 11 interglacial |
title_fullStr |
Oceanic forcing of the Marine Isotope Stage 11 interglacial |
title_full_unstemmed |
Oceanic forcing of the Marine Isotope Stage 11 interglacial |
title_sort |
oceanic forcing of the marine isotope stage 11 interglacial |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2009 |
url |
http://discovery.ucl.ac.uk/101323/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
NAT GEOSCI , 2 (6) 427 - 432. (2009) |
_version_ |
1766272834567405568 |