A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland
Extending oceanographic data beyond the instrumental period is highly needed to better characterize and understand multi-decadal to centennial natural ocean variability. Here, a stable isotope record at unprecedented temporal resolution (1 to 2 years) from a new marine core retrieved off western Nor...
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Online Access: | https://hdl.handle.net/11250/2732247 https://doi.org/10.1371/journal.pone.0239373 |
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ftnorce:oai:norceresearch.brage.unit.no:11250/2732247 2023-05-15T15:14:08+02:00 A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland Simon, Margit Hildegard Muschitiello, Francesco Tisserand, Amandine Aline Olsen, Are Moros, Matthias Perner, Kerstin Bårdsnes, Siv Tone Dokken, Trond Martin Jansen, Eystein 2020 application/pdf https://hdl.handle.net/11250/2732247 https://doi.org/10.1371/journal.pone.0239373 eng eng PLOS ONE. 2020, 15:e0239373 (9), 1-26. urn:issn:1932-6203 https://hdl.handle.net/11250/2732247 https://doi.org/10.1371/journal.pone.0239373 cristin:1847152 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2020, Simon et al. CC-BY PLOS ONE 15:e0239373 9 1-26 Peer reviewed Journal article 2020 ftnorce https://doi.org/10.1371/journal.pone.0239373 2022-10-13T05:50:21Z Extending oceanographic data beyond the instrumental period is highly needed to better characterize and understand multi-decadal to centennial natural ocean variability. Here, a stable isotope record at unprecedented temporal resolution (1 to 2 years) from a new marine core retrieved off western North Iceland is presented. We aim to better constrain the variability of subsurface, Atlantic-derived Subpolar Mode Water (SPMW), using near surface-dwelling planktic foraminifera and Arctic Intermediate Water (AIW) mass changes using benthic foraminifera over the last ~165 years. The reconstruction overlaps in time with instrumental observations and a direct comparison reveals that the δ18O record of Neogloboquadrina pachyderma is reliably representing temperature fluctuations in the SPMWs. Trends in the N. pachyderma δ13C record match the measured phosphate concentration in the upper 200 m on the North Icelandic Shelf well. Near surface-dwelling foraminifera trace anthropogenic CO2 in the Iceland Sea by ~ 1950 ± 8, however, a reduced amplitude shift in the Marine Suess effect is identified. We argue that this is caused by a contemporary ongoing increase in marine primary productivity in the upper ocean due to enhanced Greenland’s freshwater discharge that has contributed to a nutrient-driven fertilization since the 1940s/50s (Perner et al., 2019). Multi-decadal variability is detected. We find that the 16-year periodicity evident in SPMW and AIWs based on the δ18O of N. pachyderma and M. barleeanum is a signal of SST anomalies propagated into the Nordic Seas via the Atlantic inflow branches around Iceland. Spectral analyses of the planktic foraminiferal δ13C signal indicate intermittent 30-year cycles that are likely reflecting the ocean response to atmospheric variability, presumably the East Atlantic Pattern. A long-term trend in benthic δ18O suggests that Atlantic-derived waters are expanding their core within the water column from the subsurface into deeper intermediate depths towards the present day. This is a ... Article in Journal/Newspaper Arctic Foraminifera* Iceland Neogloboquadrina pachyderma Nordic Seas NORCE vitenarkiv (Norwegian Research Centre) Arctic PLOS ONE 15 9 e0239373 |
institution |
Open Polar |
collection |
NORCE vitenarkiv (Norwegian Research Centre) |
op_collection_id |
ftnorce |
language |
English |
description |
Extending oceanographic data beyond the instrumental period is highly needed to better characterize and understand multi-decadal to centennial natural ocean variability. Here, a stable isotope record at unprecedented temporal resolution (1 to 2 years) from a new marine core retrieved off western North Iceland is presented. We aim to better constrain the variability of subsurface, Atlantic-derived Subpolar Mode Water (SPMW), using near surface-dwelling planktic foraminifera and Arctic Intermediate Water (AIW) mass changes using benthic foraminifera over the last ~165 years. The reconstruction overlaps in time with instrumental observations and a direct comparison reveals that the δ18O record of Neogloboquadrina pachyderma is reliably representing temperature fluctuations in the SPMWs. Trends in the N. pachyderma δ13C record match the measured phosphate concentration in the upper 200 m on the North Icelandic Shelf well. Near surface-dwelling foraminifera trace anthropogenic CO2 in the Iceland Sea by ~ 1950 ± 8, however, a reduced amplitude shift in the Marine Suess effect is identified. We argue that this is caused by a contemporary ongoing increase in marine primary productivity in the upper ocean due to enhanced Greenland’s freshwater discharge that has contributed to a nutrient-driven fertilization since the 1940s/50s (Perner et al., 2019). Multi-decadal variability is detected. We find that the 16-year periodicity evident in SPMW and AIWs based on the δ18O of N. pachyderma and M. barleeanum is a signal of SST anomalies propagated into the Nordic Seas via the Atlantic inflow branches around Iceland. Spectral analyses of the planktic foraminiferal δ13C signal indicate intermittent 30-year cycles that are likely reflecting the ocean response to atmospheric variability, presumably the East Atlantic Pattern. A long-term trend in benthic δ18O suggests that Atlantic-derived waters are expanding their core within the water column from the subsurface into deeper intermediate depths towards the present day. This is a ... |
format |
Article in Journal/Newspaper |
author |
Simon, Margit Hildegard Muschitiello, Francesco Tisserand, Amandine Aline Olsen, Are Moros, Matthias Perner, Kerstin Bårdsnes, Siv Tone Dokken, Trond Martin Jansen, Eystein |
spellingShingle |
Simon, Margit Hildegard Muschitiello, Francesco Tisserand, Amandine Aline Olsen, Are Moros, Matthias Perner, Kerstin Bårdsnes, Siv Tone Dokken, Trond Martin Jansen, Eystein A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
author_facet |
Simon, Margit Hildegard Muschitiello, Francesco Tisserand, Amandine Aline Olsen, Are Moros, Matthias Perner, Kerstin Bårdsnes, Siv Tone Dokken, Trond Martin Jansen, Eystein |
author_sort |
Simon, Margit Hildegard |
title |
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
title_short |
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
title_full |
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
title_fullStr |
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
title_full_unstemmed |
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland |
title_sort |
multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 ad) from northwest of iceland |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2732247 https://doi.org/10.1371/journal.pone.0239373 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* Iceland Neogloboquadrina pachyderma Nordic Seas |
genre_facet |
Arctic Foraminifera* Iceland Neogloboquadrina pachyderma Nordic Seas |
op_source |
PLOS ONE 15:e0239373 9 1-26 |
op_relation |
PLOS ONE. 2020, 15:e0239373 (9), 1-26. urn:issn:1932-6203 https://hdl.handle.net/11250/2732247 https://doi.org/10.1371/journal.pone.0239373 cristin:1847152 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2020, Simon et al. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0239373 |
container_title |
PLOS ONE |
container_volume |
15 |
container_issue |
9 |
container_start_page |
e0239373 |
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