Stable isotope record and aklenonen index of MIS 11 sediments
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| Autori principali: | , , , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2009
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| _version_ | 1867168558401716224 |
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| author | Dickson, Alexander J Beer, Christopher J Dempsey, Ciara Maslin, Mark Bendle, James A McClymont, Erin L Pancost, Richard D |
| author_facet | Dickson, Alexander J Beer, Christopher J Dempsey, Ciara Maslin, Mark Bendle, James A McClymont, Erin L Pancost, Richard D |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_768375 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope record and aklenonen index of MIS 11 sediments Dickson, Alexander J Beer, Christopher J Dempsey, Ciara Maslin, Mark Bendle, James A McClymont, Erin L Pancost, Richard D 175-1085; Benguela Current, South Atlantic Ocean; COMPCORE; Composite Core; GeoB1720-2; GeoB1720-3; Gravity corer (Kiel type); Joides Resolution; Leg175; M20/2; Meteor (1986); MUC; MultiCorer; Namibia continental slope; Ocean Drilling Program; ODP; SL 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. |
| title | Stable isotope record and aklenonen index of MIS 11 sediments |
| topic | 175-1085; Benguela Current, South Atlantic Ocean; COMPCORE; Composite Core; GeoB1720-2; GeoB1720-3; Gravity corer (Kiel type); Joides Resolution; Leg175; M20/2; Meteor (1986); MUC; MultiCorer; Namibia continental slope; Ocean Drilling Program; ODP; SL |
| url | https://doi.org/10.1594/PANGAEA.768375 |