Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean
Early-Middle Pleistocene climate and deep ocean hydrography have been reconstructed using oxygen and carbon isotope ratio measurements in planktonic and benthic foraminifera from a high-deposition-rate sedimentary succession recovered at the Bermuda Rise, in the northern Sargasso Sea (Ocean Drilling...
Published in: | Geological Society, London, Special Publications |
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Format: | Book Part |
Language: | English |
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The Geological Society Publishing House
2005
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Online Access: | http://hdl.handle.net/10278/3711509 https://doi.org/10.1144/GSL.SP.2005.247.01.07 https://sp.lyellcollection.org/content/247/1/131 |
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ftuniveneziairis:oai:iris.unive.it:10278/3711509 2024-04-14T08:02:10+00:00 Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. Head, M.J. Gibbard, P.L. Gibbard, P.L Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. 2005 STAMPA http://hdl.handle.net/10278/3711509 https://doi.org/10.1144/GSL.SP.2005.247.01.07 https://sp.lyellcollection.org/content/247/1/131 eng eng The Geological Society Publishing House country:GBR place:London info:eu-repo/semantics/altIdentifier/isbn/1-86239-181-5 info:eu-repo/semantics/altIdentifier/wos/WOS:000235186200007 ispartofbook:Early-Middle Pleistocene transitions: the land-ocean evidence volume:247 firstpage:131 lastpage:145 numberofpages:15 serie:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON alleditors:Head, M.J.; Gibbard, P.L http://hdl.handle.net/10278/3711509 doi:10.1144/GSL.SP.2005.247.01.07 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-31344478329 https://sp.lyellcollection.org/content/247/1/131 info:eu-repo/semantics/closedAccess Settore GEO/02 - Geologia Stratigrafica e Sedimentologica Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/bookPart 2005 ftuniveneziairis https://doi.org/10.1144/GSL.SP.2005.247.01.07 2024-03-21T18:09:06Z Early-Middle Pleistocene climate and deep ocean hydrography have been reconstructed using oxygen and carbon isotope ratio measurements in planktonic and benthic foraminifera from a high-deposition-rate sedimentary succession recovered at the Bermuda Rise, in the northern Sargasso Sea (Ocean Drilling Program Leg 172, Site 1063). The site’s water depth makes it sensitive to changes in the balance between North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) in the deep North Atlantic, allowing the evaluation of perturbations in deep water production at different timescales. Millennial-scale fluctuations, superimposed on the longer period oscillations of orbital origin, occurred during all the observed climate states. The highest amplitude sub-Milankovitch fluctuations were mainly associated with interglacials, particularly after the intensification of the glacial regime at c. 900 ka. Using the benthic carbon isotope signal as a water mass tracer, and by comparing the δ13C record to a suite of drill sites in the North Atlantic and Pacific oceans, it has been possible to infer that the relative strength of AABW production varied through time, as did that of NADW. A scenario in which the two different source components of deep water can undergo dramatic changes in their circulation regime through time should be taken into consideration when evaluating the role of thermohaline circulation in global climate change. Book Part Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic Pacific Geological Society, London, Special Publications 247 1 131 145 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore GEO/02 - Geologia Stratigrafica e Sedimentologica Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/02 - Geologia Stratigrafica e Sedimentologica Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/08 - Geochimica e Vulcanologia Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
topic_facet |
Settore GEO/02 - Geologia Stratigrafica e Sedimentologica Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/08 - Geochimica e Vulcanologia |
description |
Early-Middle Pleistocene climate and deep ocean hydrography have been reconstructed using oxygen and carbon isotope ratio measurements in planktonic and benthic foraminifera from a high-deposition-rate sedimentary succession recovered at the Bermuda Rise, in the northern Sargasso Sea (Ocean Drilling Program Leg 172, Site 1063). The site’s water depth makes it sensitive to changes in the balance between North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) in the deep North Atlantic, allowing the evaluation of perturbations in deep water production at different timescales. Millennial-scale fluctuations, superimposed on the longer period oscillations of orbital origin, occurred during all the observed climate states. The highest amplitude sub-Milankovitch fluctuations were mainly associated with interglacials, particularly after the intensification of the glacial regime at c. 900 ka. Using the benthic carbon isotope signal as a water mass tracer, and by comparing the δ13C record to a suite of drill sites in the North Atlantic and Pacific oceans, it has been possible to infer that the relative strength of AABW production varied through time, as did that of NADW. A scenario in which the two different source components of deep water can undergo dramatic changes in their circulation regime through time should be taken into consideration when evaluating the role of thermohaline circulation in global climate change. |
author2 |
Head, M.J. Gibbard, P.L. Gibbard, P.L Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. |
format |
Book Part |
author |
Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. |
author_facet |
Ferretti, P. Shackleton, N. J. Rio, D. Hall, M. A. |
author_sort |
Ferretti, P. |
title |
Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
title_short |
Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
title_full |
Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
title_fullStr |
Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
title_full_unstemmed |
Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: Southern Hemisphere modulation of the North Atlantic Ocean |
title_sort |
early-middle pleistocene deep circulation in the western subtropical atlantic: southern hemisphere modulation of the north atlantic ocean |
publisher |
The Geological Society Publishing House |
publishDate |
2005 |
url |
http://hdl.handle.net/10278/3711509 https://doi.org/10.1144/GSL.SP.2005.247.01.07 https://sp.lyellcollection.org/content/247/1/131 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/1-86239-181-5 info:eu-repo/semantics/altIdentifier/wos/WOS:000235186200007 ispartofbook:Early-Middle Pleistocene transitions: the land-ocean evidence volume:247 firstpage:131 lastpage:145 numberofpages:15 serie:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON alleditors:Head, M.J.; Gibbard, P.L http://hdl.handle.net/10278/3711509 doi:10.1144/GSL.SP.2005.247.01.07 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-31344478329 https://sp.lyellcollection.org/content/247/1/131 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1144/GSL.SP.2005.247.01.07 |
container_title |
Geological Society, London, Special Publications |
container_volume |
247 |
container_issue |
1 |
container_start_page |
131 |
op_container_end_page |
145 |
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1796313066067984384 |