Physical properties of sediment cores from the Labrador Sea
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| Sprache: | en |
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PANGAEA
2001
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| author | Weber, Michael E Mayer, Larry A Hillaire-Marcel, Claude Bilodeau, Guy Rack, Frank R Hiscott, Richard N Aksu, Ali E |
| author_facet | Weber, Michael E Mayer, Larry A Hillaire-Marcel, Claude Bilodeau, Guy Rack, Frank R Hiscott, Richard N Aksu, Ali E |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediment core logs from six sediment cores in the Labrador Sea show millennial-scale climate variability during the last glacial by recording all Heinrich events and several major Dansgaard-Oeschger cycles. The same millennial-scale climate change is documented for surface-water d18O records of Neogloboquadrina pachyderma (left coiled); hence the surface-water d18O record can be derived from sediment core logging by means of multiple linear regression, providing a paleoclimate proxy record at very high temporal resolution (70 yrs). For the Labrador Sea, sediment core logs contain important information about deep-water current velocities and also reflect the variable input of IRD from different sources as inferred from grain-size analysis, benthic d18O, the relation of density and p-wave velocity, and magnetic susceptibility. For the last glacial, faster deep-water currents which correspond to highs in sediment physical properties, occurred during iceberg discharge and lasted for a several centuries to a few millennia. Those enhanced currents might have contributed to increased production of intermediate waters during times of reduced production of North Atlantic Deep Water. Hudson Strait might have acted as a major supplier of detrital carbonate only during lowered sea level (greater ice extent). During coldest atmospheric temperatures over Greenland, deep-water currents increased during iceberg discharge in the Labrador Sea, then surface water freshened shortly after, while the abrupt atmospheric temperature rise happened after a larger time lag of >=1 kyr. The correlation implies a strong link and common forcing for atmosphere, sea surface, and deep water during the last glacial at millennial time scales but decoupling at orbital time scales. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_778950 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Physical properties of sediment cores from the Labrador Sea Weber, Michael E Mayer, Larry A Hillaire-Marcel, Claude Bilodeau, Guy Rack, Frank R Hiscott, Richard N Aksu, Ali E 45F; CALYPSO; Calypso Corer; Fogo Sea Mount; Greenland Rise; IMAGES; IMAGES I; IMAGES V; International Marine Global Change Study; Laurentian fan; Marion Dufresne (1995); MD101__Campaign; MD114; MD952024; MD95-2024; MD952025; MD95-2025; MD952026; MD95-2026; MD952028; MD95-2028; MD952029; MD95-2029; MD952031; MD95-2031; MD952033; MD95-2033; MD99-2242; Narwhal; Orphan Knoll; Sackville spur; upper Laurentien Island Sediment core logs from six sediment cores in the Labrador Sea show millennial-scale climate variability during the last glacial by recording all Heinrich events and several major Dansgaard-Oeschger cycles. The same millennial-scale climate change is documented for surface-water d18O records of Neogloboquadrina pachyderma (left coiled); hence the surface-water d18O record can be derived from sediment core logging by means of multiple linear regression, providing a paleoclimate proxy record at very high temporal resolution (70 yrs). For the Labrador Sea, sediment core logs contain important information about deep-water current velocities and also reflect the variable input of IRD from different sources as inferred from grain-size analysis, benthic d18O, the relation of density and p-wave velocity, and magnetic susceptibility. For the last glacial, faster deep-water currents which correspond to highs in sediment physical properties, occurred during iceberg discharge and lasted for a several centuries to a few millennia. Those enhanced currents might have contributed to increased production of intermediate waters during times of reduced production of North Atlantic Deep Water. Hudson Strait might have acted as a major supplier of detrital carbonate only during lowered sea level (greater ice extent). During coldest atmospheric temperatures over Greenland, deep-water currents increased during iceberg discharge in the Labrador Sea, then surface water freshened shortly after, while the abrupt atmospheric temperature rise happened after a larger time lag of >=1 kyr. The correlation implies a strong link and common forcing for atmosphere, sea surface, and deep water during the last glacial at millennial time scales but decoupling at orbital time scales. |
| title | Physical properties of sediment cores from the Labrador Sea |
| topic | 45F; CALYPSO; Calypso Corer; Fogo Sea Mount; Greenland Rise; IMAGES; IMAGES I; IMAGES V; International Marine Global Change Study; Laurentian fan; Marion Dufresne (1995); MD101__Campaign; MD114; MD952024; MD95-2024; MD952025; MD95-2025; MD952026; MD95-2026; MD952028; MD95-2028; MD952029; MD95-2029; MD952031; MD95-2031; MD952033; MD95-2033; MD99-2242; Narwhal; Orphan Knoll; Sackville spur; upper Laurentien Island |
| url | https://doi.org/10.1594/PANGAEA.778950 |