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Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach

Jacek Raddatz, Volker Liebetrau, Julie Trotter, Andres Rüggeberg, Sascha Flögel, Wolf-Christian Dullo, Anton Eisenhauer, Silke Voigt and Malcolm McCulloch (2016) PALEOCEANOGRAPHY. 31(10). p.1350-1367
abstract
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
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
journal title
PALEOCEANOGRAPHY
Paleoceanography
volume
31
issue
10
pages
1350 - 1367
Web of Science type
Article
Web of Science id
000387775200004
JCR category
PALEONTOLOGY
JCR impact factor
3.254 (2016)
JCR rank
1/53 (2016)
JCR quartile
1 (2016)
ISSN
0883-8305
1944-9186
DOI
10.1002/2016PA002974
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8522925
handle
http://hdl.handle.net/1854/LU-8522925
date created
2017-06-09 06:55:24
date last changed
2017-06-28 12:36:25
@article{8522925,
  abstract     = {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.},
  author       = {Raddatz, Jacek and Liebetrau, Volker and Trotter, Julie and R{\"u}ggeberg, Andres and Fl{\"o}gel, Sascha and Dullo, Wolf-Christian and Eisenhauer, Anton and Voigt, Silke and McCulloch, Malcolm},
  issn         = {0883-8305},
  journal      = {PALEOCEANOGRAPHY},
  keyword      = {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},
  language     = {eng},
  number       = {10},
  pages        = {1350--1367},
  title        = {Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach},
  url          = {http://dx.doi.org/10.1002/2016PA002974},
  volume       = {31},
  year         = {2016},
}

Chicago
Raddatz, Jacek, Volker Liebetrau, Julie Trotter, Andres Rüggeberg, Sascha Flögel, Wolf-Christian Dullo, Anton Eisenhauer, Silke Voigt, and Malcolm McCulloch. 2016. “Environmental Constraints on Holocene Cold-water Coral Reef Growth Off Norway : Insights from a Multiproxy Approach.” Paleoceanography 31 (10): 1350–1367.
APA
Raddatz, Jacek, Liebetrau, V., Trotter, J., Rüggeberg, A., Flögel, S., Dullo, W.-C., Eisenhauer, A., et al. (2016). Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach. PALEOCEANOGRAPHY, 31(10), 1350–1367.
Vancouver
1.
Raddatz J, Liebetrau V, Trotter J, Rüggeberg A, Flögel S, Dullo W-C, et al. Environmental constraints on Holocene cold-water coral reef growth off Norway : insights from a multiproxy approach. PALEOCEANOGRAPHY. 2016;31(10):1350–67.
MLA
Raddatz, Jacek, Volker Liebetrau, Julie Trotter, et al. “Environmental Constraints on Holocene Cold-water Coral Reef Growth Off Norway : Insights from a Multiproxy Approach.” PALEOCEANOGRAPHY 31.10 (2016): 1350–1367. Print.