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...
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Online Access: | http://hdl.handle.net/11577/1472724 https://doi.org/10.1144/GSL.SP.2005.247.01.07 |
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ftunivpadovairis:oai:www.research.unipd.it:11577/1472724 2024-04-21T07:51:05+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. HALL M. A. RIO, DOMENICO M. J. HEAD AND P. L. GIBBARD Ferretti, P. Shackleton, N. J. Hall, M. A. Rio, Domenico 2005 STAMPA http://hdl.handle.net/11577/1472724 https://doi.org/10.1144/GSL.SP.2005.247.01.07 eng eng Geological Society of London country:GBR place:London info:eu-repo/semantics/altIdentifier/wos/WOS:000235186200007 ispartofseries:Geological Society of London, Special publication ispartofbook:Early-Middle Pleistocene Transition: The Land-Ocean Evidence volume:247 firstpage:131 lastpage:145 numberofpages:15 http://hdl.handle.net/11577/1472724 doi:10.1144/GSL.SP.2005.247.01.07 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-31344478329 foraminifera oceanic circulation paleoceanography Pleistocene info:eu-repo/semantics/bookPart 2005 ftunivpadovairis https://doi.org/10.1144/GSL.SP.2005.247.01.07 2024-03-28T01:29:42Z 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 δ 13C 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. © The Geological Society of London 2005 Book Part Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Padua Research Archive (IRIS - Università degli Studi di Padova) Geological Society, London, Special Publications 247 1 131 145 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
foraminifera oceanic circulation paleoceanography Pleistocene |
spellingShingle |
foraminifera oceanic circulation paleoceanography Pleistocene FERRETTI P. SHACKLETON N. J. HALL M. A. RIO, DOMENICO Early-Middle Pleistocene deep circulation in the western subtropical Atlantic: southern hemisphere modulation of the North Atlantic Ocean |
topic_facet |
foraminifera oceanic circulation paleoceanography Pleistocene |
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 δ 13C 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. © The Geological Society of London 2005 |
author2 |
M. J. HEAD AND P. L. GIBBARD Ferretti, P. Shackleton, N. J. Hall, M. A. Rio, Domenico |
format |
Book Part |
author |
FERRETTI P. SHACKLETON N. J. HALL M. A. RIO, DOMENICO |
author_facet |
FERRETTI P. SHACKLETON N. J. HALL M. A. RIO, DOMENICO |
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 |
Geological Society of London |
publishDate |
2005 |
url |
http://hdl.handle.net/11577/1472724 https://doi.org/10.1144/GSL.SP.2005.247.01.07 |
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/wos/WOS:000235186200007 ispartofseries:Geological Society of London, Special publication ispartofbook:Early-Middle Pleistocene Transition: The Land-Ocean Evidence volume:247 firstpage:131 lastpage:145 numberofpages:15 http://hdl.handle.net/11577/1472724 doi:10.1144/GSL.SP.2005.247.01.07 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-31344478329 |
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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1796934563492003840 |