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°N, Oslofjord 59°N) we applied boron isotopes (δ¹¹B), Ba/Ca, Li/Mg, and U/...
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ftreroch:oai:doc.rero.ch:20170201152612-YW 2023-05-15T15:10:14+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 2017-02-01T14:29:34Z http://doc.rero.ch/record/278593/files/rug_ech.pdf eng eng http://doc.rero.ch/record/278593/files/rug_ech.pdf 2017 ftreroch 2023-02-16T17:27:10Z 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°N, Oslofjord 59°N) we applied boron isotopes (δ¹¹B), 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 ~6.4 and 4.8 ka. 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 6.4 ka 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 6.4 ka. 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 δ¹¹B record from ~25.0‰ to ~27.0‰ probably implies enhanced pH up-regulation of the CWCs due to the higher pCO₂ concentrations of ambient seawater, which hastened mid-Holocene CWC reef decline on the Norwegian margin. Other/Unknown Material Arctic glacier Lophelia pertusa north atlantic current North Atlantic RERO DOC Digital Library Arctic Lopphavet ENVELOPE(21.133,21.133,70.442,70.442) Norway |
institution |
Open Polar |
collection |
RERO DOC Digital Library |
op_collection_id |
ftreroch |
language |
English |
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°N, Oslofjord 59°N) we applied boron isotopes (δ¹¹B), 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 ~6.4 and 4.8 ka. 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 6.4 ka 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 6.4 ka. 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 δ¹¹B record from ~25.0‰ to ~27.0‰ probably implies enhanced pH up-regulation of the CWCs due to the higher pCO₂ concentrations of ambient seawater, which hastened mid-Holocene CWC reef decline on the Norwegian margin. |
author |
Raddatz, Jacek Liebetrau, Volker Trotter, Julie Rüggeberg, Andres Flögel, Sascha Dullo, Wolf-Christian Eisenhauer, Anton Voigt, Silke McCulloch, Malcolm |
spellingShingle |
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 |
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 |
2017 |
url |
http://doc.rero.ch/record/278593/files/rug_ech.pdf |
long_lat |
ENVELOPE(21.133,21.133,70.442,70.442) |
geographic |
Arctic Lopphavet Norway |
geographic_facet |
Arctic Lopphavet Norway |
genre |
Arctic glacier Lophelia pertusa north atlantic current North Atlantic |
genre_facet |
Arctic glacier Lophelia pertusa north atlantic current North Atlantic |
op_relation |
http://doc.rero.ch/record/278593/files/rug_ech.pdf |
_version_ |
1766341283941449728 |