Consulta: subjectFacets:"Heinrich Event"
Registros recuperados: 3
Data/hora: 27/07/2024 02:02:14

Climate variability and ice-sheet dynamics during the last three glaciations
Provedor de dados: 5
Autores: Obrochta, Stephen P.; Crowley, Thomas J.; Channell, James E. T.; Hodell, David A.; Baker, Paul A.; Seki, Arisa; Yokoyama, Yusuke.
A composite North Atlantic record from DSDP Site 609 and IODP Site U1308 spans the past 300,000 years and shows that variability within the penultimate glaciation differed substantially from that of the surrounding two glaciations. Hematite-stained grains exhibit similar repetitive down-core variations within the Marine Isotope Stage (MIS) 8 and 4-2 intervals, but little cyclic variability within the MIS 6 section. There is also no petrologic evidence, in terms of detrital carbonate-rich (Heinrich) layers, for surging of the Laurentide Ice Sheet through the Hudson Strait during MIS 6. Rather, very high background concentration of iceberg-rafted debris (IRD) indicates near continuous glacial meltwater input that likely increased thermohaline disruption...
Tipo: Text
Palavras-chave: Insolation; IRD; Heinrich Event; MIS 6; MIS 8; AMOC.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00289/40050/38793.pdf

Enhanced Mediterranean-Atlantic exchange during Atlantic freshening phases
Provedor de dados: 5
Autores: Rogerson, M.; Colmenero-hidalgo, E.; Levine, R. C.; Rohling, E. J.; Voelker, A. H. L.; Bigg, G. R.; Schoenfeld, J.; Cacho, I.; Sierro, F. J.; Lowemark, L.; Reguera, M. I.; De Abreu, L.; Garrick, K.
The Atlantic-Mediterranean exchange of water at Gibraltar represents a significant heat and freshwater sink for the North Atlantic and is a major control on the heat, salt and freshwater budgets of the Mediterranean Sea. Consequently, an understanding of the response of the exchange system to external changes is vital to a full comprehension of the hydrographic responses in both ocean basins. Here, we use a synthesis of empirical (oxygen isotope, planktonic foraminiferal assemblage) and modeling (analytical and general circulation) approaches to investigate the response of the Gibraltar Exchange system to Atlantic freshening during Heinrich Stadials (HSs). HSs display relatively flat W-E surface hydrographic gradients more comparable to the Late Holocene...
Tipo: Text
Palavras-chave: Atlantic; Mediterranean; Gibraltar; Heinrich Event; Last Glacial Maximum; Mediterranean Outflow.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00231/34189/32775.pdf

Lithologie des délestages glaciaires (niveaux de Heinrich) de l'Eperon de Goban (Atlantique Nord-Est)
Provedor de dados: 5
Autores: Van Rooij, David.
Goban Spur is a marginal plateau, 250 km SW of Ireland, with the Celtic Margin on its eastern side and Porcupine Seabight Basin on its northern side. A set of NNE-SSW trending escarpments separate the upper part of Goban Spur from the Porcupine Abyssal Plain. We have studied a transect of Kullenberg cores taken during the 1984 Norestlante 2 campaign. Biostratigraphical and sedimentological (carbonate content) analyses were carried out by Müller [1986] and Foucault [1987]. All cores were accurately cleaned and described before digital photographs were taken in order to obtain grey level profiles and an estimate of the coarse grain size fraction (&gt; 150 µm). Magnetic susceptibility and gamma density measurements were obtained using a GEOTEK Multi Sensor...
Tipo: Text
Palavras-chave: Goban Spur; Quaternaire; Sédiments; Délestages glaciaires; IRD; Turbidites; Niveau de Heinrich; Calotte glaciaire.; Goban Spur; Quaternary; Sediments; IRD; Turbidites; Heinrich Layer; Heinrich Event; Ice Sheet.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00412/52317/53096.pdf