Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications
Six sediment cores from the Eurasian Basin were studied to determine and understand climatically driven changes of Arctic Ocean basins. Detailed time control of sediments for the last 45 kyr is based on accelerator mass spectrometry (AMS) C14-dating of biogenic carbonate (N. pachyderma, left coiling...
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ftoceanrep:oai:oceanrep.geomar.de:33268 2023-05-15T14:24:13+02:00 Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications Mienert, Jürgen Mayer, L. A. Jones, G. A. King, J. W. Bleil, Ulrich Thiede, Jörn 1990 text https://oceanrep.geomar.de/id/eprint/33268/ https://oceanrep.geomar.de/id/eprint/33268/1/scan_2016-06-27_13-09-29r.1.pdf https://doi.org/10.1007/978-94-009-2029-3_26 en eng Kluwer https://oceanrep.geomar.de/id/eprint/33268/1/scan_2016-06-27_13-09-29r.1.pdf Mienert, J., Mayer, L. A., Jones, G. A. and King, J. W. (1990) Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications. In: Geological History of the Polar Oceans: Arctic versus Antarctic. , ed. by Bleil, U. and Thiede, J. Kluwer, Dordrecht, pp. 455-473. DOI 10.1007/978-94-009-2029-3_26 <https://doi.org/10.1007/978-94-009-2029-3_26>. doi:10.1007/978-94-009-2029-3_26 info:eu-repo/semantics/restrictedAccess Book chapter NonPeerReviewed 1990 ftoceanrep https://doi.org/10.1007/978-94-009-2029-3_26 2023-04-07T15:26:30Z Six sediment cores from the Eurasian Basin were studied to determine and understand climatically driven changes of Arctic Ocean basins. Detailed time control of sediments for the last 45 kyr is based on accelerator mass spectrometry (AMS) C14-dating of biogenic carbonate (N. pachyderma, left coiling). The most important results from our study are summarized as follows. From 45 to 13.5 ka low sedimentation rates prevailed (0.35 cm/kyr). They increased drastically at the transition from the last glacial to interglacial (Termination Ia, 13.5 ka) leading into high Holocene sedimentation rates (1.06 cm/kyr). Low carbonate concentrations (< 4%) prevailed from 13.5 to 9 ka at Termination I. Decreased salinities can be expected for Termination la (Zahn et al., 1985, Jones & Keigwin, 1988, Mienert et al., 1989) due to glacial meltwater influence possibly accompanied by sea ice melting. As a result of the freshwater influence, productivity of planktic foraminifers decreased and this, in turn, resulted in a drastic decrease in carbonate concentration during Termination Ia. Although carbonate concentration varies only between 0 and 9%, it distinctly changes both the compressional-wave velocity (from 1485 to 1510 m/s) and the wave attenuation (from 0.1 to 0.45 dB/m/kHz) in the sediment. Climatically driven changes in magnetic susceptibility have proved to be a valuable paleoclimatic tool for intercore correlations. Our results indicate that the same general conclusions are valid for pelagic environments of both Atlantic and Arctic Ocean basins. Book Part Arctic Arctic Arctic Ocean Magnetic susceptibility Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean 455 473 Dordrecht |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Six sediment cores from the Eurasian Basin were studied to determine and understand climatically driven changes of Arctic Ocean basins. Detailed time control of sediments for the last 45 kyr is based on accelerator mass spectrometry (AMS) C14-dating of biogenic carbonate (N. pachyderma, left coiling). The most important results from our study are summarized as follows. From 45 to 13.5 ka low sedimentation rates prevailed (0.35 cm/kyr). They increased drastically at the transition from the last glacial to interglacial (Termination Ia, 13.5 ka) leading into high Holocene sedimentation rates (1.06 cm/kyr). Low carbonate concentrations (< 4%) prevailed from 13.5 to 9 ka at Termination I. Decreased salinities can be expected for Termination la (Zahn et al., 1985, Jones & Keigwin, 1988, Mienert et al., 1989) due to glacial meltwater influence possibly accompanied by sea ice melting. As a result of the freshwater influence, productivity of planktic foraminifers decreased and this, in turn, resulted in a drastic decrease in carbonate concentration during Termination Ia. Although carbonate concentration varies only between 0 and 9%, it distinctly changes both the compressional-wave velocity (from 1485 to 1510 m/s) and the wave attenuation (from 0.1 to 0.45 dB/m/kHz) in the sediment. Climatically driven changes in magnetic susceptibility have proved to be a valuable paleoclimatic tool for intercore correlations. Our results indicate that the same general conclusions are valid for pelagic environments of both Atlantic and Arctic Ocean basins. |
author2 |
Bleil, Ulrich Thiede, Jörn |
format |
Book Part |
author |
Mienert, Jürgen Mayer, L. A. Jones, G. A. King, J. W. |
spellingShingle |
Mienert, Jürgen Mayer, L. A. Jones, G. A. King, J. W. Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
author_facet |
Mienert, Jürgen Mayer, L. A. Jones, G. A. King, J. W. |
author_sort |
Mienert, Jürgen |
title |
Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
title_short |
Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
title_full |
Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
title_fullStr |
Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
title_full_unstemmed |
Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications |
title_sort |
physical and acoustic properties of arctic ocean deep-sea sediments: paleoclimatic implications |
publisher |
Kluwer |
publishDate |
1990 |
url |
https://oceanrep.geomar.de/id/eprint/33268/ https://oceanrep.geomar.de/id/eprint/33268/1/scan_2016-06-27_13-09-29r.1.pdf https://doi.org/10.1007/978-94-009-2029-3_26 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Magnetic susceptibility Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Magnetic susceptibility Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/33268/1/scan_2016-06-27_13-09-29r.1.pdf Mienert, J., Mayer, L. A., Jones, G. A. and King, J. W. (1990) Physical and Acoustic Properties of Arctic Ocean Deep-Sea Sediments: Paleoclimatic Implications. In: Geological History of the Polar Oceans: Arctic versus Antarctic. , ed. by Bleil, U. and Thiede, J. Kluwer, Dordrecht, pp. 455-473. DOI 10.1007/978-94-009-2029-3_26 <https://doi.org/10.1007/978-94-009-2029-3_26>. doi:10.1007/978-94-009-2029-3_26 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/978-94-009-2029-3_26 |
container_start_page |
455 |
op_container_end_page |
473 |
op_publisher_place |
Dordrecht |
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1766296668759654400 |