Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach
High-latitude cold-water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6 degrees N, Oslofjord 59 degrees N) we applied boron isotopes (B-11), Ba/C...
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ftunivgent:oai:archive.ugent.be:8522925 2023-06-11T04:09:47+02:00 Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach Raddatz, Jacek Liebetrau, Volker Trotter, Julie Rüggeberg, Andres Flögel, Sascha Dullo, Wolf-Christian Eisenhauer, Anton Voigt, Silke McCulloch, Malcolm 2016 application/pdf https://biblio.ugent.be/publication/8522925 http://hdl.handle.net/1854/LU-8522925 https://doi.org/10.1002/2016PA002974 https://biblio.ugent.be/publication/8522925/file/8522926 eng eng https://biblio.ugent.be/publication/8522925 http://hdl.handle.net/1854/LU-8522925 http://dx.doi.org/10.1002/2016PA002974 https://biblio.ugent.be/publication/8522925/file/8522926 No license (in copyright) info:eu-repo/semantics/restrictedAccess PALEOCEANOGRAPHY ISSN: 0883-8305 ISSN: 1944-9186 Earth and Environmental Sciences DEEP-SEA CORALS COVERED CARBONATE MOUND LOPHELIA-PERTUSA NORTHERN NORWAY SCLERACTINIAN CORALS OCEAN ACIDIFICATION PORCUPINE SEABIGHT NORTHEASTERN ATLANTIC DESMOPHYLLUM-DIANTHUS BENTHIC FORAMINIFERA cold-water corals Lophelia pertusa boron isotopes Holocene pH upregulation Li Mg journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivgent https://doi.org/10.1002/2016PA002974 2023-05-10T22:21:24Z High-latitude cold-water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6 degrees N, Oslofjord 59 degrees N) we applied boron isotopes (B-11), Ba/Ca, Li/Mg, and U/Ca ratios to reconstruct the environmental boundary conditions of CWC reef growth. The sedimentary record from these CWC reefs reveals a lack of corals between similar to 6.4 and 4.8ka. The question remains if this phenomenon is related to changes in the carbonate system or other causes. The initial postglacial setting had elevated Ba/Ca ratios, indicative of meltwater fluxes showing a decreasing trend toward cessation at 6.4ka with an oscillation pattern similar to continental glacier fluctuations. Downcore U/Ca ratios reveal an increasing trend, which is outside the range of modern U/Ca variability in L. pertusa, suggesting changes of seawater pH near 6.4ka. The reconstructed bottom water temperature at Lopphavet reveals a striking similarity to Barent sea surface and subsea surface temperature records. We infer that meltwater pulses weakened the North Atlantic Current system, resulting in southward advances of cold and CO2-rich Arctic waters. A corresponding shift in the B-11 record from similar to 25.0 to similar to 27.0 probably implies enhanced pH up-regulation of the CWCs due to the higher pCO(2) concentrations of ambient seawater, which hastened mid-Holocene CWC reef decline on the Norwegian margin. Article in Journal/Newspaper Arctic Foraminifera* glacier Lophelia pertusa north atlantic current North Atlantic Northern Norway Ocean acidification Ghent University Academic Bibliography Arctic Norway Porcupine Seabight ENVELOPE(-13.000,-13.000,50.500,50.500) Lopphavet ENVELOPE(21.133,21.133,70.442,70.442) Paleoceanography 31 10 1350 1367 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences DEEP-SEA CORALS COVERED CARBONATE MOUND LOPHELIA-PERTUSA NORTHERN NORWAY SCLERACTINIAN CORALS OCEAN ACIDIFICATION PORCUPINE SEABIGHT NORTHEASTERN ATLANTIC DESMOPHYLLUM-DIANTHUS BENTHIC FORAMINIFERA cold-water corals Lophelia pertusa boron isotopes Holocene pH upregulation Li Mg |
spellingShingle |
Earth and Environmental Sciences DEEP-SEA CORALS COVERED CARBONATE MOUND LOPHELIA-PERTUSA NORTHERN NORWAY SCLERACTINIAN CORALS OCEAN ACIDIFICATION PORCUPINE SEABIGHT NORTHEASTERN ATLANTIC DESMOPHYLLUM-DIANTHUS BENTHIC FORAMINIFERA cold-water corals Lophelia pertusa boron isotopes Holocene pH upregulation Li Mg Raddatz, Jacek Liebetrau, Volker Trotter, Julie Rüggeberg, Andres Flögel, Sascha Dullo, Wolf-Christian Eisenhauer, Anton Voigt, Silke McCulloch, Malcolm Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
topic_facet |
Earth and Environmental Sciences DEEP-SEA CORALS COVERED CARBONATE MOUND LOPHELIA-PERTUSA NORTHERN NORWAY SCLERACTINIAN CORALS OCEAN ACIDIFICATION PORCUPINE SEABIGHT NORTHEASTERN ATLANTIC DESMOPHYLLUM-DIANTHUS BENTHIC FORAMINIFERA cold-water corals Lophelia pertusa boron isotopes Holocene pH upregulation Li Mg |
description |
High-latitude cold-water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6 degrees N, Oslofjord 59 degrees N) we applied boron isotopes (B-11), Ba/Ca, Li/Mg, and U/Ca ratios to reconstruct the environmental boundary conditions of CWC reef growth. The sedimentary record from these CWC reefs reveals a lack of corals between similar to 6.4 and 4.8ka. The question remains if this phenomenon is related to changes in the carbonate system or other causes. The initial postglacial setting had elevated Ba/Ca ratios, indicative of meltwater fluxes showing a decreasing trend toward cessation at 6.4ka with an oscillation pattern similar to continental glacier fluctuations. Downcore U/Ca ratios reveal an increasing trend, which is outside the range of modern U/Ca variability in L. pertusa, suggesting changes of seawater pH near 6.4ka. The reconstructed bottom water temperature at Lopphavet reveals a striking similarity to Barent sea surface and subsea surface temperature records. We infer that meltwater pulses weakened the North Atlantic Current system, resulting in southward advances of cold and CO2-rich Arctic waters. A corresponding shift in the B-11 record from similar to 25.0 to similar to 27.0 probably implies enhanced pH up-regulation of the CWCs due to the higher pCO(2) concentrations of ambient seawater, which hastened mid-Holocene CWC reef decline on the Norwegian margin. |
format |
Article in Journal/Newspaper |
author |
Raddatz, Jacek Liebetrau, Volker Trotter, Julie Rüggeberg, Andres Flögel, Sascha Dullo, Wolf-Christian Eisenhauer, Anton Voigt, Silke McCulloch, Malcolm |
author_facet |
Raddatz, Jacek Liebetrau, Volker Trotter, Julie Rüggeberg, Andres Flögel, Sascha Dullo, Wolf-Christian Eisenhauer, Anton Voigt, Silke McCulloch, Malcolm |
author_sort |
Raddatz, Jacek |
title |
Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
title_short |
Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
title_full |
Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
title_fullStr |
Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
title_full_unstemmed |
Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach |
title_sort |
environmental constraints on holocene cold-water coral reef growth off norway : insights from a multiproxy approach |
publishDate |
2016 |
url |
https://biblio.ugent.be/publication/8522925 http://hdl.handle.net/1854/LU-8522925 https://doi.org/10.1002/2016PA002974 https://biblio.ugent.be/publication/8522925/file/8522926 |
long_lat |
ENVELOPE(-13.000,-13.000,50.500,50.500) ENVELOPE(21.133,21.133,70.442,70.442) |
geographic |
Arctic Norway Porcupine Seabight Lopphavet |
geographic_facet |
Arctic Norway Porcupine Seabight Lopphavet |
genre |
Arctic Foraminifera* glacier Lophelia pertusa north atlantic current North Atlantic Northern Norway Ocean acidification |
genre_facet |
Arctic Foraminifera* glacier Lophelia pertusa north atlantic current North Atlantic Northern Norway Ocean acidification |
op_source |
PALEOCEANOGRAPHY ISSN: 0883-8305 ISSN: 1944-9186 |
op_relation |
https://biblio.ugent.be/publication/8522925 http://hdl.handle.net/1854/LU-8522925 http://dx.doi.org/10.1002/2016PA002974 https://biblio.ugent.be/publication/8522925/file/8522926 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2016PA002974 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
10 |
container_start_page |
1350 |
op_container_end_page |
1367 |
_version_ |
1768383769423642624 |