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Evolution of the northeast Labrador Sea during the last interglaciation ArchiMer
Winsor, Kelsey; Carlson, Anders E.; Klinkhammer, Gary P.; Stoner, Joseph S.; Hatfield, Robert G..
Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography across terminations (T) I and II and during the LIG to assess the impact of two different magnitudes of boreal summer insolation increase on the northeast Labrador Sea. We use Mg/Ca ratios in Neogloboquadrina pachyderma (sinistral) as a proxy of calcification temperature to document changes in subsurface temperatures over Eirik Drift. Our corresponding record of delta O-18 of seawater documents changes in water mass salinity. Mg/Ca calcification temperatures...
Tipo: Text Palavras-chave: Neogloboquadrina pachyderma (sinistral); Labrador Sea; Mg/Ca; Deglaciations; Interglaciations; Subpolar gyre.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00265/37604/36840.pdf
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Interglacial responses of the southern Greenland ice sheet over the last 430,000 years determined using particle-size specific magnetic and isotopic tracers ArchiMer
Hatfield, Robert G.; Reyes, Alberto V.; Stoner, Joseph S.; Carlson, Anders E.; Beard, Brian L.; Winsor, Kelsey; Welke, Bethany.
The past behavior of the Greenland ice sheet can provide important insight into climatic thresholds that may initiate and drive major ice-sheet retreat. Particle-size-specific magnetic and Sr–Nd–Pb isotope records from Eirik Ridge sediments south of Greenland track southern Greenland ice sheet (sGIS) erosional signatures over the past ∼430 ka by discriminating changes in sediment source and transport over the Eirik Ridge. Ground-truthed magnetic and isotopic compositions of subglacial silt from south Greenland's Precambrian bedrock terranes constrain independent magnetic and isotopic estimates of Eirik Ridge silt provenance, which in turn indicate that the southern Greenland ice sheet (sGIS) retreated within its present margin during three of the four...
Tipo: Text Palavras-chave: South Greenland ice sheet; Sediment tracing; Radiogenic isotopes; Magnetic properties; Quaternary climate change; Sea-level rise.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00353/46384/46007.pdf
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Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea ArchiMer
Hoffman, Jeremy S.; Carlson, Anders E.; Winsor, Kelsey; Klinkhammer, Gary P.; Legrande, Allegra N.; Andrews, John T.; Strasser, Jeffrey C..
The 8.2 ka event was the last deglacial abrupt climate event. A reduction in the Atlantic meridional overturning circulation (AMOC) attributed to the drainage of glacial Lake Agassiz may have caused the event, but the freshwater signature of Lake Agassiz discharge has yet to be identified in delta O-18 of foraminiferal calcite records from the Labrador Sea, calling into question the connection between freshwater discharge to the North Atlantic and AMOC strength. Using Mg/Ca-paleothermometry, we demonstrate that similar to 3 degrees C of near-surface ocean cooling masked an similar to 1.0 parts per thousand decrease in western Labrador Sea delta O-18 of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic delta O-18 of seawater...
Tipo: Text
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00496/60740/65179.pdf
Registros recuperados: 3
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