Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal
Continental and marine conditions during the last millennium off Porto, Portugal (the southern pole of the North Atlantic Oscillation, NAO), are reconstructed from a sediment archive through a high-resolution multiproxy study and instrumental evidence. Results show multidecadal variability and sea s...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.784992 2023-05-15T17:32:00+02:00 Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal Abrantes, Fatima F Rodrigues, Teresa Montanari, B Santos, C Witt, L Lopes, Cristina Voelker, Antje H L MEDIAN LATITUDE: 41.335670 * MEDIAN LONGITUDE: -8.988663 * SOUTH-BOUND LATITUDE: 41.335670 * WEST-BOUND LONGITUDE: -8.988830 * NORTH-BOUND LATITUDE: 41.335670 * EAST-BOUND LONGITUDE: -8.987830 * DATE/TIME START: 2002-04-25T10:23:00 * DATE/TIME END: 2002-04-25T11:30:00 2011-06-25 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.784992 https://doi.org/10.1594/PANGAEA.784992 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.784992 https://doi.org/10.1594/PANGAEA.784992 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Abrantes, Fatima F; Rodrigues, Teresa; Montanari, B; Santos, C; Witt, L; Lopes, Cristina; Voelker, Antje H L (2011): Climate of the last millennium at the southern pole of the North Atlantic Oscillation: an inner-shelf sediment record of flooding and upwelling. Climate Research, 48(2-3), 261-280, https://doi.org/10.3354/cr01010 BC Box corer GC Gravity corer PALEO 1 Portuguese Margin POS287 POS287_06-1B POS287_06-3G Poseidon Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.784992 https://doi.org/10.3354/cr01010 2023-01-20T07:32:35Z Continental and marine conditions during the last millennium off Porto, Portugal (the southern pole of the North Atlantic Oscillation, NAO), are reconstructed from a sediment archive through a high-resolution multiproxy study and instrumental evidence. Results show multidecadal variability and sea surface temperatures (SSTs) that correlate well with previously published land and sea-based Northern Hemisphere temperature records, and appear to be responding to long-term solar insolation variability. Precipitation was negatively correlated with the NAO, whereas strong flooding events occurred at times of marked climate cooling (AD 1100-1150 and 1400-1470) and transitions in solar activity. AD 1850 marks a major shift in the phytoplankton community associated with a decoupling of d18O records of 3 planktonic foraminifera species. These changes are interpreted as a response to a reduction in the summer and/or annual upwelling and more frequent fall-winter upwelling-like events. This shift's coincidence with a decrease in SST and the increase in coherence between our data and the Atlantic Multidecadal Oscillation (AMO) confirms the connection of the upwelling variability to the North Atlantic Ocean's surface and thermohaline circulation on a decadal scale. The disappearance of this agreement between the AMO and our records beyond AD 1850 and its coincidence with the beginning of the recent rise in atmospheric CO2 supports the hypothesis of a strong anthropogenic effect on the last ~150 yr of the climate record. Furthermore, it raises an important question of the use of instrumental records as the sole calibration data set for climate reconstructions, as these may not provide the best analogue for climate beyond AD 1730. Dataset North Atlantic North Atlantic oscillation Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-8.988830,-8.987830,41.335670,41.335670) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
BC Box corer GC Gravity corer PALEO 1 Portuguese Margin POS287 POS287_06-1B POS287_06-3G Poseidon |
spellingShingle |
BC Box corer GC Gravity corer PALEO 1 Portuguese Margin POS287 POS287_06-1B POS287_06-3G Poseidon Abrantes, Fatima F Rodrigues, Teresa Montanari, B Santos, C Witt, L Lopes, Cristina Voelker, Antje H L Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
topic_facet |
BC Box corer GC Gravity corer PALEO 1 Portuguese Margin POS287 POS287_06-1B POS287_06-3G Poseidon |
description |
Continental and marine conditions during the last millennium off Porto, Portugal (the southern pole of the North Atlantic Oscillation, NAO), are reconstructed from a sediment archive through a high-resolution multiproxy study and instrumental evidence. Results show multidecadal variability and sea surface temperatures (SSTs) that correlate well with previously published land and sea-based Northern Hemisphere temperature records, and appear to be responding to long-term solar insolation variability. Precipitation was negatively correlated with the NAO, whereas strong flooding events occurred at times of marked climate cooling (AD 1100-1150 and 1400-1470) and transitions in solar activity. AD 1850 marks a major shift in the phytoplankton community associated with a decoupling of d18O records of 3 planktonic foraminifera species. These changes are interpreted as a response to a reduction in the summer and/or annual upwelling and more frequent fall-winter upwelling-like events. This shift's coincidence with a decrease in SST and the increase in coherence between our data and the Atlantic Multidecadal Oscillation (AMO) confirms the connection of the upwelling variability to the North Atlantic Ocean's surface and thermohaline circulation on a decadal scale. The disappearance of this agreement between the AMO and our records beyond AD 1850 and its coincidence with the beginning of the recent rise in atmospheric CO2 supports the hypothesis of a strong anthropogenic effect on the last ~150 yr of the climate record. Furthermore, it raises an important question of the use of instrumental records as the sole calibration data set for climate reconstructions, as these may not provide the best analogue for climate beyond AD 1730. |
format |
Dataset |
author |
Abrantes, Fatima F Rodrigues, Teresa Montanari, B Santos, C Witt, L Lopes, Cristina Voelker, Antje H L |
author_facet |
Abrantes, Fatima F Rodrigues, Teresa Montanari, B Santos, C Witt, L Lopes, Cristina Voelker, Antje H L |
author_sort |
Abrantes, Fatima F |
title |
Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
title_short |
Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
title_full |
Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
title_fullStr |
Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
title_full_unstemmed |
Geochemistry, isotopic ratios, granulometry and Uk'37 derived SST of cores obtained during Poseidon cruise POS287, off Portugal |
title_sort |
geochemistry, isotopic ratios, granulometry and uk'37 derived sst of cores obtained during poseidon cruise pos287, off portugal |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.784992 https://doi.org/10.1594/PANGAEA.784992 |
op_coverage |
MEDIAN LATITUDE: 41.335670 * MEDIAN LONGITUDE: -8.988663 * SOUTH-BOUND LATITUDE: 41.335670 * WEST-BOUND LONGITUDE: -8.988830 * NORTH-BOUND LATITUDE: 41.335670 * EAST-BOUND LONGITUDE: -8.987830 * DATE/TIME START: 2002-04-25T10:23:00 * DATE/TIME END: 2002-04-25T11:30:00 |
long_lat |
ENVELOPE(-8.988830,-8.987830,41.335670,41.335670) |
genre |
North Atlantic North Atlantic oscillation Planktonic foraminifera |
genre_facet |
North Atlantic North Atlantic oscillation Planktonic foraminifera |
op_source |
Supplement to: Abrantes, Fatima F; Rodrigues, Teresa; Montanari, B; Santos, C; Witt, L; Lopes, Cristina; Voelker, Antje H L (2011): Climate of the last millennium at the southern pole of the North Atlantic Oscillation: an inner-shelf sediment record of flooding and upwelling. Climate Research, 48(2-3), 261-280, https://doi.org/10.3354/cr01010 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.784992 https://doi.org/10.1594/PANGAEA.784992 |
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.784992 https://doi.org/10.3354/cr01010 |
_version_ |
1766129901501415424 |