Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon
A high-resolution sedimentary sequence recovered from the Tagus prodelta has been studied with the objective to reconstruct multi-decadal to centennial-scale climate variability on the western Iberian Margin and to discuss the observations in a wider oceanographic and climatic context. Between ca. 1...
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Language: | English |
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PANGAEA
2015
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.858741 https://doi.org/10.1594/PANGAEA.858741 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.858741 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
BC Box corer D13902 D249 Discovery (1962) GC Gravity corer PALEO 1 PC Piston corer Portuguese Margin POS287 POS287_26-1B POS287_26-3G Poseidon |
spellingShingle |
BC Box corer D13902 D249 Discovery (1962) GC Gravity corer PALEO 1 PC Piston corer Portuguese Margin POS287 POS287_26-1B POS287_26-3G Poseidon Bartels-Jonsdottir, Helga B Voelker, Antje H L Abrantes, Fatima F Salgueiro, Emilia Rodrigues, Teresa Knudsen, Karen Luise Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
topic_facet |
BC Box corer D13902 D249 Discovery (1962) GC Gravity corer PALEO 1 PC Piston corer Portuguese Margin POS287 POS287_26-1B POS287_26-3G Poseidon |
description |
A high-resolution sedimentary sequence recovered from the Tagus prodelta has been studied with the objective to reconstruct multi-decadal to centennial-scale climate variability on the western Iberian Margin and to discuss the observations in a wider oceanographic and climatic context. Between ca. 100 BC and AD 400 the foraminiferal fauna and high abundance of Globorotalia inflata indicate advection of subtropical waters via the Azores Current and the winter-time warm Portugal Coastal Current. Between ca. AD 400 and 1350, encompassing the Medieval Climate Anomaly (MCA), enhanced upwelling is indicated by the planktonic foraminiferal fauna, in particular by the high abundance of upwelling indicator species Globigerina bulloides. Relatively light d18O values and high sea surface temperature (SST) (reconstructed from foraminiferal assemblages) point to upwelling of subtropical Eastern North Atlantic Central Water. Between ca. AD 1350 and 1750, i.e. most of the Little Ice Age, relatively heavy d18O values and low reconstructed SST, as well as high abundances of Neogloboquadrina incompta, indicate the advection of cold subpolar waters to the area and a southward deflection of the subpolar front in the North Atlantic, as well as changes in the mode of the North Atlantic Oscillation. In addition, the assemblage composition together with the other proxy data reveals less upwelling and stronger river input than during the MCA. Stronger Azores Current influence on the Iberian Margin and strong anthropogenic effect on the climate after AD 1750 is indicated by the foraminiferal fauna. The foraminiferal assemblage shows a significant change in surface water conditions at ca. AD 1900, including enhanced river runoff, a rapid increase in temperature and increased influence of the Azores Current. The Tagus record displays a high degree of similarity to other North Atlantic records, indicating that the site is influenced by atmospheric-oceanic processes operating throughout the North Atlantic, as well as by local changes. |
format |
Dataset |
author |
Bartels-Jonsdottir, Helga B Voelker, Antje H L Abrantes, Fatima F Salgueiro, Emilia Rodrigues, Teresa Knudsen, Karen Luise |
author_facet |
Bartels-Jonsdottir, Helga B Voelker, Antje H L Abrantes, Fatima F Salgueiro, Emilia Rodrigues, Teresa Knudsen, Karen Luise |
author_sort |
Bartels-Jonsdottir, Helga B |
title |
Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
title_short |
Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
title_full |
Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
title_fullStr |
Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
title_full_unstemmed |
Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon |
title_sort |
stable isotope ratios on 3 sediment cores from tagus prodelta off lisbon |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.858741 https://doi.org/10.1594/PANGAEA.858741 |
op_coverage |
MEDIAN LATITUDE: 38.556613 * MEDIAN LONGITUDE: -9.354667 * SOUTH-BOUND LATITUDE: 38.554000 * WEST-BOUND LONGITUDE: -9.364500 * NORTH-BOUND LATITUDE: 38.558170 * EAST-BOUND LONGITUDE: -9.335500 * DATE/TIME START: 2000-09-01T00:00:00 * DATE/TIME END: 2002-04-29T10:08:00 |
long_lat |
ENVELOPE(-9.364500,-9.335500,38.558170,38.554000) |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Supplement to: Bartels-Jonsdottir, Helga B; Voelker, Antje H L; Abrantes, Fatima F; Salgueiro, Emilia; Rodrigues, Teresa; Knudsen, Karen Luise (2015): High-frequency surface water changes in the Tagus prodelta off Lisbon, eastern North Atlantic, during the last two millennia. Marine Micropaleontology, 117, 13-24, https://doi.org/10.1016/j.marmicro.2015.03.001 |
op_relation |
Bartels-Jonsdottir, Helga B; Knudsen, Karen Luise; Schönfeld, Joachim; Lebreiro, Susana Martin; Abrantes, Fatima F (2006): Recent benthic foraminifera from the Tagus Prodelta and Estuary, Portugal: microhabitats, assemblage composition and stable isotopes. Zitteliana Reihe A, A46, 91-104, urn:nbn:de:bvb:19-epub-11963-3 Bartels-Jonsdottir, Helga B; Voelker, Antje H L; Knudsen, Karen Luise; Abrantes, Fatima F (2009): Twentieth-century warming and hydrographical changes in the Tagus Prodelta, eastern North Atlantic. The Holocene, 19(3), 369-380, https://doi.org/10.1177/0959683608101388 https://doi.pangaea.de/10.1594/PANGAEA.858741 https://doi.org/10.1594/PANGAEA.858741 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.858741 https://doi.org/10.1016/j.marmicro.2015.03.001 https://doi.org/10.1177/0959683608101388 |
_version_ |
1766121540510810112 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.858741 2023-05-15T17:28:42+02:00 Stable isotope ratios on 3 sediment cores from Tagus prodelta off Lisbon Bartels-Jonsdottir, Helga B Voelker, Antje H L Abrantes, Fatima F Salgueiro, Emilia Rodrigues, Teresa Knudsen, Karen Luise MEDIAN LATITUDE: 38.556613 * MEDIAN LONGITUDE: -9.354667 * SOUTH-BOUND LATITUDE: 38.554000 * WEST-BOUND LONGITUDE: -9.364500 * NORTH-BOUND LATITUDE: 38.558170 * EAST-BOUND LONGITUDE: -9.335500 * DATE/TIME START: 2000-09-01T00:00:00 * DATE/TIME END: 2002-04-29T10:08:00 2015-03-10 application/zip, 10 datasets https://doi.pangaea.de/10.1594/PANGAEA.858741 https://doi.org/10.1594/PANGAEA.858741 en eng PANGAEA Bartels-Jonsdottir, Helga B; Knudsen, Karen Luise; Schönfeld, Joachim; Lebreiro, Susana Martin; Abrantes, Fatima F (2006): Recent benthic foraminifera from the Tagus Prodelta and Estuary, Portugal: microhabitats, assemblage composition and stable isotopes. Zitteliana Reihe A, A46, 91-104, urn:nbn:de:bvb:19-epub-11963-3 Bartels-Jonsdottir, Helga B; Voelker, Antje H L; Knudsen, Karen Luise; Abrantes, Fatima F (2009): Twentieth-century warming and hydrographical changes in the Tagus Prodelta, eastern North Atlantic. The Holocene, 19(3), 369-380, https://doi.org/10.1177/0959683608101388 https://doi.pangaea.de/10.1594/PANGAEA.858741 https://doi.org/10.1594/PANGAEA.858741 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bartels-Jonsdottir, Helga B; Voelker, Antje H L; Abrantes, Fatima F; Salgueiro, Emilia; Rodrigues, Teresa; Knudsen, Karen Luise (2015): High-frequency surface water changes in the Tagus prodelta off Lisbon, eastern North Atlantic, during the last two millennia. Marine Micropaleontology, 117, 13-24, https://doi.org/10.1016/j.marmicro.2015.03.001 BC Box corer D13902 D249 Discovery (1962) GC Gravity corer PALEO 1 PC Piston corer Portuguese Margin POS287 POS287_26-1B POS287_26-3G Poseidon Dataset 2015 ftpangaea https://doi.org/10.1594/PANGAEA.858741 https://doi.org/10.1016/j.marmicro.2015.03.001 https://doi.org/10.1177/0959683608101388 2023-01-20T07:33:41Z A high-resolution sedimentary sequence recovered from the Tagus prodelta has been studied with the objective to reconstruct multi-decadal to centennial-scale climate variability on the western Iberian Margin and to discuss the observations in a wider oceanographic and climatic context. Between ca. 100 BC and AD 400 the foraminiferal fauna and high abundance of Globorotalia inflata indicate advection of subtropical waters via the Azores Current and the winter-time warm Portugal Coastal Current. Between ca. AD 400 and 1350, encompassing the Medieval Climate Anomaly (MCA), enhanced upwelling is indicated by the planktonic foraminiferal fauna, in particular by the high abundance of upwelling indicator species Globigerina bulloides. Relatively light d18O values and high sea surface temperature (SST) (reconstructed from foraminiferal assemblages) point to upwelling of subtropical Eastern North Atlantic Central Water. Between ca. AD 1350 and 1750, i.e. most of the Little Ice Age, relatively heavy d18O values and low reconstructed SST, as well as high abundances of Neogloboquadrina incompta, indicate the advection of cold subpolar waters to the area and a southward deflection of the subpolar front in the North Atlantic, as well as changes in the mode of the North Atlantic Oscillation. In addition, the assemblage composition together with the other proxy data reveals less upwelling and stronger river input than during the MCA. Stronger Azores Current influence on the Iberian Margin and strong anthropogenic effect on the climate after AD 1750 is indicated by the foraminiferal fauna. The foraminiferal assemblage shows a significant change in surface water conditions at ca. AD 1900, including enhanced river runoff, a rapid increase in temperature and increased influence of the Azores Current. The Tagus record displays a high degree of similarity to other North Atlantic records, indicating that the site is influenced by atmospheric-oceanic processes operating throughout the North Atlantic, as well as by local changes. Dataset North Atlantic North Atlantic oscillation PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-9.364500,-9.335500,38.558170,38.554000) |