Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP
Sea surface temperatures (SSTs) were reconstructed from planktonic foraminiferal assemblages in two sediment cores off the NW Iberian Continental Margin for the last 40 kyr. Results of this work were compared with published SSTs estimated in six cores from the Iberian Margin and the delta O-18 data...
Published in: | Marine Geology |
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Online Access: | http://hdl.handle.net/11576/2628047 https://doi.org/10.1016/j.margeo.2015.06.001 |
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ftunivurbino:oai:ora.uniurb.it:11576/2628047 2024-04-14T08:07:57+00:00 Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP Martins, Maria Virgínia Alves Perretti, Adriana Rodrigues Salgueiro, Emilia FRONTALINI, FABRIZIO Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho Martins, Maria Virgínia Alve Perretti, Adriana Rodrigue Salgueiro, Emilia Frontalini, Fabrizio Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho 2015 http://hdl.handle.net/11576/2628047 https://doi.org/10.1016/j.margeo.2015.06.001 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000358389600014 volume:367 firstpage:191 lastpage:201 numberofpages:11 journal:MARINE GEOLOGY http://hdl.handle.net/11576/2628047 doi:10.1016/j.margeo.2015.06.001 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84934944612 Planktonic foraminifera SIMMAX-SST SSTMg/Ca delta O-18 Paleoceanography Last glaciation info:eu-repo/semantics/article 2015 ftunivurbino https://doi.org/10.1016/j.margeo.2015.06.001 2024-03-21T17:03:04Z Sea surface temperatures (SSTs) were reconstructed from planktonic foraminiferal assemblages in two sediment cores off the NW Iberian Continental Margin for the last 40 kyr. Results of this work were compared with published SSTs estimated in six cores from the Iberian Margin and the delta O-18 data from NGRIP ice core of Greenland. Longitudinal and latitudinal SST changes were identified in several intervals related to alterations in the hydrographic conditions off the Iberian Peninsula, namely the influence of the upwelling system, the intensity of Paleo-Portugal and Paleo-Azores Currents, and the positions of the Polar and Arctic Fronts. During the Holocene, the SSTs were quite stable along the west Iberian Margin when compared with the last glaciation. However, during the Last Glacial Maximum (LGM) SSTs were not much lower than during the Holocene. The Portugal Current, as an eastward descending branch of the North Atlantic Drift, should have been quite vigorous in transporting warm water to the west Iberian Margin, which could have moderated the SSTs during the LGM. However, our results suggest a much higher instability during the LGM than previously reported and much lower SSTs at 42 degrees N. The lowest SSTs during the last 40 ka were recorded during the Heinrich Stadials (HS) and the Younger Dryas (YD). During the HS, SSTs at the northwest Iberian Margin were lower than today by about 10 to 16 degrees C as a result of the invasion of cool and low-salinity water masses and the increased transport of icebergs from the northern seas. The Polar Front was persistently situated at 42 degrees N for similar to 3 ka during the HS1, and a comparable present-day Arctic Front should have been present up to the latitude of 40 degrees N during the HS2, HS3, and HS4 off the west Iberian Peninsula. The HS were recorded all along the west Iberian Margin. However, an overall trend of increasing of mean SSTs from north to south of similar to 8 degrees C during the HS1, of similar to 10 degrees C during the HS2b and HS3, of ... Article in Journal/Newspaper Arctic Foraminifera* Greenland ice core Iceberg* NGRIP North Atlantic Planktonic foraminifera Università degli Studi di Urbino: CINECA IRIS Arctic Greenland Marine Geology 367 191 201 |
institution |
Open Polar |
collection |
Università degli Studi di Urbino: CINECA IRIS |
op_collection_id |
ftunivurbino |
language |
English |
topic |
Planktonic foraminifera SIMMAX-SST SSTMg/Ca delta O-18 Paleoceanography Last glaciation |
spellingShingle |
Planktonic foraminifera SIMMAX-SST SSTMg/Ca delta O-18 Paleoceanography Last glaciation Martins, Maria Virgínia Alves Perretti, Adriana Rodrigues Salgueiro, Emilia FRONTALINI, FABRIZIO Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
topic_facet |
Planktonic foraminifera SIMMAX-SST SSTMg/Ca delta O-18 Paleoceanography Last glaciation |
description |
Sea surface temperatures (SSTs) were reconstructed from planktonic foraminiferal assemblages in two sediment cores off the NW Iberian Continental Margin for the last 40 kyr. Results of this work were compared with published SSTs estimated in six cores from the Iberian Margin and the delta O-18 data from NGRIP ice core of Greenland. Longitudinal and latitudinal SST changes were identified in several intervals related to alterations in the hydrographic conditions off the Iberian Peninsula, namely the influence of the upwelling system, the intensity of Paleo-Portugal and Paleo-Azores Currents, and the positions of the Polar and Arctic Fronts. During the Holocene, the SSTs were quite stable along the west Iberian Margin when compared with the last glaciation. However, during the Last Glacial Maximum (LGM) SSTs were not much lower than during the Holocene. The Portugal Current, as an eastward descending branch of the North Atlantic Drift, should have been quite vigorous in transporting warm water to the west Iberian Margin, which could have moderated the SSTs during the LGM. However, our results suggest a much higher instability during the LGM than previously reported and much lower SSTs at 42 degrees N. The lowest SSTs during the last 40 ka were recorded during the Heinrich Stadials (HS) and the Younger Dryas (YD). During the HS, SSTs at the northwest Iberian Margin were lower than today by about 10 to 16 degrees C as a result of the invasion of cool and low-salinity water masses and the increased transport of icebergs from the northern seas. The Polar Front was persistently situated at 42 degrees N for similar to 3 ka during the HS1, and a comparable present-day Arctic Front should have been present up to the latitude of 40 degrees N during the HS2, HS3, and HS4 off the west Iberian Peninsula. The HS were recorded all along the west Iberian Margin. However, an overall trend of increasing of mean SSTs from north to south of similar to 8 degrees C during the HS1, of similar to 10 degrees C during the HS2b and HS3, of ... |
author2 |
Martins, Maria Virgínia Alve Perretti, Adriana Rodrigue Salgueiro, Emilia Frontalini, Fabrizio Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho |
format |
Article in Journal/Newspaper |
author |
Martins, Maria Virgínia Alves Perretti, Adriana Rodrigues Salgueiro, Emilia FRONTALINI, FABRIZIO Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho |
author_facet |
Martins, Maria Virgínia Alves Perretti, Adriana Rodrigues Salgueiro, Emilia FRONTALINI, FABRIZIO Moreno, João Soares, António M. Mahiques, Michel Silva, Sérgio de Azevedo, Carlos A. Dias, João Alveirinho |
author_sort |
Martins, Maria Virgínia Alves |
title |
Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
title_short |
Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
title_full |
Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
title_fullStr |
Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
title_full_unstemmed |
Atlantic sea surface temperatures estimated from planktonic foraminifera off the Iberian Margin over the last 40Ka BP |
title_sort |
atlantic sea surface temperatures estimated from planktonic foraminifera off the iberian margin over the last 40ka bp |
publishDate |
2015 |
url |
http://hdl.handle.net/11576/2628047 https://doi.org/10.1016/j.margeo.2015.06.001 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Foraminifera* Greenland ice core Iceberg* NGRIP North Atlantic Planktonic foraminifera |
genre_facet |
Arctic Foraminifera* Greenland ice core Iceberg* NGRIP North Atlantic Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000358389600014 volume:367 firstpage:191 lastpage:201 numberofpages:11 journal:MARINE GEOLOGY http://hdl.handle.net/11576/2628047 doi:10.1016/j.margeo.2015.06.001 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84934944612 |
op_doi |
https://doi.org/10.1016/j.margeo.2015.06.001 |
container_title |
Marine Geology |
container_volume |
367 |
container_start_page |
191 |
op_container_end_page |
201 |
_version_ |
1796305381165629440 |