Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records
Marine sediments from the Integrated Ocean Drilling Project (IODP) Site U1314 (56.36°N, 27.88°W), in the subpolar North Atlantic, were studied for their planktonic foraminifera, calcium carbonate content, and Neogloboqudrina pachyderma sinistral (sin.) δ13C records in order to reconstruct surface an...
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2013
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ftunivbern:oai:boris.unibe.ch:39449 2023-08-20T04:04:12+02:00 Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records Hernandez Almeida, Ivan Sierro, Francisco Javier Flores, José-Abel Cacho, Isabel Filippelli, Gabriel Michael 2013-01 application/pdf https://boris.unibe.ch/39449/1/bor283.pdf https://boris.unibe.ch/39449/8/Boreas.42.Hernandez-Almeida%20et%20al%202013.pdf https://boris.unibe.ch/39449/ eng eng Wiley-Blackwell https://boris.unibe.ch/39449/ info:eu-repo/semantics/restrictedAccess info:eu-repo/semantics/openAccess Hernandez Almeida, Ivan; Sierro, Francisco Javier; Flores, José-Abel; Cacho, Isabel; Filippelli, Gabriel Michael (2013). Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records. Boreas, 42(1), pp. 140-159. Wiley-Blackwell 10.1111/j.1502-3885.2012.00283.x <http://dx.doi.org/10.1111/j.1502-3885.2012.00283.x> 550 Earth sciences & geology 910 Geography & travel info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2013 ftunivbern https://doi.org/10.1111/j.1502-3885.2012.00283.x 2023-07-31T21:00:58Z Marine sediments from the Integrated Ocean Drilling Project (IODP) Site U1314 (56.36°N, 27.88°W), in the subpolar North Atlantic, were studied for their planktonic foraminifera, calcium carbonate content, and Neogloboqudrina pachyderma sinistral (sin.) δ13C records in order to reconstruct surface and intermediate conditions in this region during the Mid-Pleistocene Transition (MPT). Variations in the palaeoceanography and regional dynamics of the Arctic Front were estimated by comparing CaCO3 content, planktonic foraminiferal species abundances, carbon isotopes and ice-rafted debris (IRD) data from Site U1314 with published data from other North Atlantic sites. Site U1314 exhibited high abundances of the polar planktonic foraminifera N. pachyderma sin. and low CaCO3 content until Marine Isotope Stage (MIS) 26, indicating a relatively southeastward position of the Arctic Front (AF) and penetration of colder and low-salinity surface arctic water-masses. Changing conditions after MIS 25, with oscillations in the position of the AF, caused an increase in the northward export of the warmer North Atlantic Current (NAC), indicated by greater abundances of non-polar planktonic foraminifera and higher CaCO3. The N. pachyderma sin. δ13C data indicate good ventilation of the upper part of the intermediate water layer in the eastern North Atlantic during both glacial and interglacial stages, except during Terminations 24/23, 22/21 and 20/1. In addition, for N. pachyderma (sin.) we distinguished two morphotypes: non-encrusted and heavily encrusted test. Results indicate that increases in the encrusted morphotype and lower planktonic foraminiferal diversity are related to the intensification of glacial conditions (lower sea-surface temperatures, sea-ice formation) during MIS 22 and 20. Article in Journal/Newspaper Arctic Foraminifera* north atlantic current North Atlantic Planktonic foraminifera Sea ice BORIS (Bern Open Repository and Information System, University of Bern) Arctic Boreas 42 1 140 159 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
550 Earth sciences & geology 910 Geography & travel |
spellingShingle |
550 Earth sciences & geology 910 Geography & travel Hernandez Almeida, Ivan Sierro, Francisco Javier Flores, José-Abel Cacho, Isabel Filippelli, Gabriel Michael Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
topic_facet |
550 Earth sciences & geology 910 Geography & travel |
description |
Marine sediments from the Integrated Ocean Drilling Project (IODP) Site U1314 (56.36°N, 27.88°W), in the subpolar North Atlantic, were studied for their planktonic foraminifera, calcium carbonate content, and Neogloboqudrina pachyderma sinistral (sin.) δ13C records in order to reconstruct surface and intermediate conditions in this region during the Mid-Pleistocene Transition (MPT). Variations in the palaeoceanography and regional dynamics of the Arctic Front were estimated by comparing CaCO3 content, planktonic foraminiferal species abundances, carbon isotopes and ice-rafted debris (IRD) data from Site U1314 with published data from other North Atlantic sites. Site U1314 exhibited high abundances of the polar planktonic foraminifera N. pachyderma sin. and low CaCO3 content until Marine Isotope Stage (MIS) 26, indicating a relatively southeastward position of the Arctic Front (AF) and penetration of colder and low-salinity surface arctic water-masses. Changing conditions after MIS 25, with oscillations in the position of the AF, caused an increase in the northward export of the warmer North Atlantic Current (NAC), indicated by greater abundances of non-polar planktonic foraminifera and higher CaCO3. The N. pachyderma sin. δ13C data indicate good ventilation of the upper part of the intermediate water layer in the eastern North Atlantic during both glacial and interglacial stages, except during Terminations 24/23, 22/21 and 20/1. In addition, for N. pachyderma (sin.) we distinguished two morphotypes: non-encrusted and heavily encrusted test. Results indicate that increases in the encrusted morphotype and lower planktonic foraminiferal diversity are related to the intensification of glacial conditions (lower sea-surface temperatures, sea-ice formation) during MIS 22 and 20. |
format |
Article in Journal/Newspaper |
author |
Hernandez Almeida, Ivan Sierro, Francisco Javier Flores, José-Abel Cacho, Isabel Filippelli, Gabriel Michael |
author_facet |
Hernandez Almeida, Ivan Sierro, Francisco Javier Flores, José-Abel Cacho, Isabel Filippelli, Gabriel Michael |
author_sort |
Hernandez Almeida, Ivan |
title |
Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
title_short |
Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
title_full |
Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
title_fullStr |
Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
title_full_unstemmed |
Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
title_sort |
palaeoceanographic changes in the north atlantic during the mid-pleistocene transition (mis 31-19) as inferred from planktonic foraminiferal and calcium carbonate records |
publisher |
Wiley-Blackwell |
publishDate |
2013 |
url |
https://boris.unibe.ch/39449/1/bor283.pdf https://boris.unibe.ch/39449/8/Boreas.42.Hernandez-Almeida%20et%20al%202013.pdf https://boris.unibe.ch/39449/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* north atlantic current North Atlantic Planktonic foraminifera Sea ice |
genre_facet |
Arctic Foraminifera* north atlantic current North Atlantic Planktonic foraminifera Sea ice |
op_source |
Hernandez Almeida, Ivan; Sierro, Francisco Javier; Flores, José-Abel; Cacho, Isabel; Filippelli, Gabriel Michael (2013). Palaeoceanographic changes in the North Atlantic during the Mid-Pleistocene Transition (MIS 31-19) as inferred from planktonic foraminiferal and calcium carbonate records. Boreas, 42(1), pp. 140-159. Wiley-Blackwell 10.1111/j.1502-3885.2012.00283.x <http://dx.doi.org/10.1111/j.1502-3885.2012.00283.x> |
op_relation |
https://boris.unibe.ch/39449/ |
op_rights |
info:eu-repo/semantics/restrictedAccess info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/j.1502-3885.2012.00283.x |
container_title |
Boreas |
container_volume |
42 |
container_issue |
1 |
container_start_page |
140 |
op_container_end_page |
159 |
_version_ |
1774714607800156160 |